Lenticular galaxy

Short description: Class of galaxy between an elliptical galaxy and a spiral galaxy

"S0s" redirects here. For other uses, see S0.

The Spindle Galaxy (NGC 5866), a lenticular galaxy in the constellation Draco. This image shows that lenticular galaxies may retain a considerable amount of dust in their disk. However, there is little to no gas, and thus they are considered deficient in interstellar matter.

A lenticular galaxy (denoted S0) is a type of galaxy intermediate between an elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes.[1] It contains a large-scale disc but does not have large-scale spiral arms. Lenticular galaxies are disc galaxies that have used up or lost most of their interstellar matter and therefore have very little ongoing star formation.[2] They may, however, retain significant dust in their disks. As a result, they consist mainly of aging stars (like elliptical galaxies). Despite the morphological differences, lenticular and elliptical galaxies share common properties like spectral features and scaling relations. Both can be considered early-type galaxies that are passively evolving, at least in the local part of the Universe. Connecting the E galaxies with the S0 galaxies are the ES galaxies with intermediate-scale discs.[3]

## Contents

* 1 Morphology and structure
* 1.1 Classification
* 1.2 Sérsic decomposition
* 1.3 Bars
* 1.4 Box-shaped bulges
* 1.5 Content
* 2 Kinematics
* 2.1 Measurement difficulties and techniques
* 2.2 Offset Tully–Fisher relation
* 3 Formation theories
* 3.1 Faded spirals
* 3.2 Mergers
* 3.3 Disk growth via accretion
* 4 Examples
* 5 Gallery
* 6 See also
* 7 Notes
* 8 References

## Morphology and structure

### Classification

NGC 2787 is an example of a lenticular galaxy with visible dust absorption. While this galaxy has been classified as an S0 galaxy, one can see the difficulty in differentiating among spirals, ellipticals, and lenticulars. Credit: HST NGC 1387 has a large nuclear ring. This galaxy is a member of the Fornax Cluster. Grid showing the location of early-type galaxies (including the lenticular S0 galaxies) relative to the late-type spiral galaxies. The horizontal axis shows the morphological type, primarily dictated by the nature of the spiral arms. The percentage of galaxies with a particular axis ratio (minor/major) for a sample of lenticular and spiral galaxies. The inset is a visual representation of the profile of either at the specified minor (b) to major (a) axis ratios.[4]

Lenticular galaxies are unique in that they have a visible disk component as well as a prominent bulge component. They have much higher bulge-to-disk ratios than typical spirals and do not have the canonical spiral arm structure of late-type[note 1] galaxies, yet may exhibit a central bar.[4] This bulge dominance can be seen in the axis ratio (i.e. the ratio between the observed minor and major axial of a disk galaxy) distribution of a lenticular galaxy sample. The distribution for lenticular galaxies rises steadily in the range 0.25 to 0.85 whereas the distribution for spirals is essentially flat in that same range.[5] Larger axial ratios can be explained by observing face-on disk galaxies or by having a sample of spheroidal (bulge-dominated) galaxies. Imagine looking at two disk galaxies edge-on, one with a bulge and one without a bulge. The galaxy with a prominent bulge will have a larger edge-on axial ratio compared to the galaxy without a bulge based on the definition of axial ratio. Thus a sample of disk galaxies with prominent spheroidal components will have more galaxies at larger axial ratios. The fact that the lenticular galaxy distribution rises with increasing observed axial ratio implies that lenticulars are dominated by a central bulge component.[4]

Lenticular galaxies are often considered to be a poorly understood transition state between spiral and elliptical galaxies, which results in their intermediate placement on the Hubble sequence. This results from lenticulars having both prominent disk and bulge components. The disk component is usually featureless, which precludes a classification system similar to spiral galaxies. As the bulge component is usually spherical, elliptical galaxy classifications are also unsuitable. Lenticular galaxies are thus divided into subclasses based upon either the amount of dust present or the prominence of a central bar. The classes of lenticular galaxies with no bar are S01, S02, and S03 where the subscripted numbers indicate the amount of dust absorption in the disk component; the corresponding classes for lenticulars with a central bar are SB01, SB02, and SB03.[4]

### Sérsic decomposition

The surface brightness profiles of lenticular galaxies are well described by the sum of a Sérsic model for the spheroidal component plus an exponentially declining model (Sérsic index of n ≈ 1) for the disk, and often a third component for the bar.[6] Sometimes there is an observed truncation in the surface brightness profiles of lenticular galaxies at ~ 4 disk scalelengths.[7] These features are consistent with the general structure of spiral galaxies. However, the bulge component of lenticulars is more closely related to elliptical galaxies in terms of morphological classification. This spheroidal region, which dominates the inner structure of lenticular galaxies, has a steeper surface brightness profile (Sérsic index typically ranging from n = 1 to 4)[8][9] than the disk component. Lenticular galaxy samples are distinguishable from the diskless (excluding small nuclear disks) elliptical galaxy population through analysis of their surface brightness profiles.[10]

### Bars

Like spiral galaxies, lenticular galaxies can possess a central bar structure. While the classification system for normal lenticulars depends on dust content, barred lenticular galaxies are classified by the prominence of the central bar. SB01 galaxies have the least defined bar structure and are only classified as having slightly enhanced surface brightness along opposite sides of the central bulge. The prominence of the bar increases with index number, thus SB03 galaxies, like the NGC 1460 have very well defined bars that can extend through the transition region between the bulge and disk.[4] NGC 1460 is actually the galaxy with one of the largest bars seen among lenticular galaxies. Unfortunately, the properties of bars in lenticular galaxies have not been researched in great detail. Understanding these properties, as well as understanding the formation mechanism for bars, would help clarify the formation or evolution history of lenticular galaxies.[7]

SB01 (NGC 2787)

SB02 (NGC 1533)

SB03 (NGC 1460)

Barred lenticular galaxies by classification

### Box-shaped bulges

NGC 1375 and NGC 1175 are examples of lenticular galaxies that have so-called box-shaped bulges. They are classified as SB0 pec. Box-shaped bulges are seen in edge-on galaxies, mostly spiral, but rarely lenticular.[11]

### Content

Hubble image of ESO 381-12[12]

In many respects the composition of lenticular galaxies is like that of ellipticals. For example, they both consist of predominately older, hence redder, stars. All of their stars are thought to be older than about a billion years, in agreement with their offset from the Tully–Fisher relation (see below). In addition to these general stellar attributes, globular clusters are found more frequently in lenticular galaxies than in spiral galaxies of similar mass and luminosity. They also have little to no molecular gas (hence the lack of star formation) and no significant hydrogen α or 21-cm emission. Finally, unlike ellipticals, they may still possess significant dust.[4]

## Kinematics

### Measurement difficulties and techniques

File:Potw1328a.tif

Lenticular galaxies share kinematic properties with both spiral and elliptical galaxies.[14] This is due to the significant bulge and disk nature of lenticulars. The bulge component is similar to elliptical galaxies in that it is pressure supported by a central velocity dispersion. This situation is analogous to a balloon, where the motions of the air particles (stars in a bulge's case) are dominated by random motions. However, the kinematics of lenticular galaxies are dominated by the rotationally supported disk. Rotation support implies the average circular motion of stars in the disk is responsible for the stability of the galaxy. Thus, kinematics are often used to distinguish lenticular galaxies from elliptical galaxies. Determining the distinction between elliptical galaxies and lenticular galaxies often relies on the measurements of velocity dispersion (σ), rotational velocity (v), and ellipticity (ε).[14] In order to differentiate between lenticulars and ellipticals, one typically looks at the v/σ ratio for a fixed ε. For example, a rough criterion for distinguishing between lenticular and elliptical galaxies is that elliptical galaxies have v/σ < 0.5 for ε = 0.3.[14] The motivation behind this criterion is that lenticular galaxies do have prominent bulge and disk components whereas elliptical galaxies have no disk structure. Thus, lenticulars have much larger v/σ ratios than ellipticals due to their non-negligible rotational velocities (due to the disk component) in addition to not having as prominent of a bulge component compared to elliptical galaxies. However, this approach using a single ratio for each galaxy is problematic due to the dependence of the v/σ ratio on the radius out to which it is measured in some early-type galaxies. For example, the ES galaxies that bridge the E and S0 galaxies, with their intermediate-scale disks, have a high v/σ ratio at intermediate radii that then drops to a low ratio at large radii.[15][16]

The kinematics of disk galaxies are usually determined by Hα or 21-cm emission lines, which are typically not present in lenticular galaxies due to their general lack of cool gas.[7] Thus kinematic information and rough mass estimates for lenticular galaxies often comes from stellar absorption lines, which are less reliable than emission line measurements. There is also a considerable amount of difficulty in deriving accurate rotational velocities for lenticular galaxies. This is a combined effect from lenticulars having difficult inclination measurements, projection effects in the bulge-disk interface region, and the random motions of stars affecting the true rotational velocities.[17] These effects make kinematic measurements of lenticular galaxies considerably more difficult compared to normal disk galaxies.

### Offset Tully–Fisher relation

This plot illustrates the Tully–Fisher relation for a spiral galaxy sample (black) as well as a lenticular galaxy sample (blue).[18] One can see how the best-fit line for spiral galaxies differs from the best-fit line for lenticular galaxies.[19]

Since lenticular galaxies are an evolved stage of spiral galaxies then they should have a similar Tully–Fisher relation with spirals, but with an offset in the luminosity / absolute magnitude axis. This would result from brighter, redder stars dominating the stellar populations of lenticulars. An example of this effect can be seen in the adjacent plot.[7] One can clearly see that the best-fit lines for the spiral galaxy data and the lenticular galaxy have the same slope (and thus follow the same Tully–Fisher relation), but are offset by ΔI ≈ 1.5. This implies that lenticular galaxies were once spiral galaxies but are now dominated by old, red stars.

## Formation theories

The morphology and kinematics of lenticular galaxies each, to a degree, suggest a mode of galaxy formation. Their disk-like, possibly dusty, appearance suggests they come from faded spiral galaxies, whose arm features disappeared. However, some lenticular galaxies are more luminous than spiral galaxies, which suggests that they are not merely the faded remnants of spiral galaxies. Lenticular galaxies might result from a galaxy merger, which increase the total stellar mass and might give the newly merged galaxy a disk-like, arm-less appearance.[7] Alternatively, it has been proposed[20] that they grew their disks via (gas and minor merger) accretion events. It had previously been suggested that the evolution of luminous lenticular galaxies may be closely linked to that of elliptical galaxies, whereas fainter lenticulars might be more closely associated with ram-pressure stripped spiral galaxies,[21] although this latter galaxy harassment scenario has since been queried due to the existence[22] of extremely isolated, low-luminosity lenticular galaxies such as LEDA 2108986.

### Faded spirals

The absence of gas, presence of dust, lack of recent star formation, and rotational support are all attributes one might expect of a spiral galaxy which had used up all of its gas in the formation of stars.[7] This possibility is further enhanced by the existence of gas poor, or "anemic", spiral galaxies. If the spiral pattern then dissipated the resulting galaxy would be similar to many lenticulars.[23] Moore et al. also document that tidal harassment – the gravitational effects from other, near-by galaxies – could aid this process in dense regions.[24] The clearest support for this theory, however, is their adherence to slightly shifted version of Tully–Fisher relation, discussed above.

A 2012 paper that suggests a new classification system, first proposed by the Canadian astronomer Sidney van den Bergh, for lenticular and dwarf spheroidal galaxies (S0a-S0b-S0c-dSph) that parallels the Hubble sequence for spirals and irregulars (Sa-Sb-Sc-Im) reinforces this idea showing how the spiral–irregular sequence is very similar to this new one for lenticulars and dwarf ellipticals.[25]

### Mergers

Messier 85 is a merged galaxy.

The analyses of Burstein[26] and Sandage[27] showed that lenticular galaxies typically have surface brightness much greater than other spiral classes. It is also thought that lenticular galaxies exhibit a larger bulge-to-disk ratio than spiral galaxies and this may be inconsistent with simple fading from a spiral.[28][29] If S0s were formed by mergers of other spirals these observations would be fitting and it would also account for the increased frequency of globular clusters. It should be mentioned, however, that advanced models of the central bulge which include both a general Sersic profile and bar indicate a smaller bulge,[30] and thus a lessened inconsistency. Mergers are also unable to account for the offset from the Tully–Fisher relation without assuming that the merged galaxies were quite different from those we see today.

### Disk growth via accretion

The creation of disks in, at least some, lenticular galaxies via the accretion of gas, and small galaxies, around a pre-existing spheroidal structure was first suggested as an explanation to match the high-redshift compact massive spheroidal-shaped galaxies with the equally compact massive bulges seen in nearby massive lenticular galaxies.[31] In a "downsizing" scenario, bigger lenticular galaxies may have been built first – in a younger universe when more gas was available – and the lower-mass galaxies may have been slower to attract their disk-building material, as in the case of the isolated early-type galaxy LEDA 2108986. Within galaxy clusters, ram-pressure stripping removes gas and prevents the accretion of new gas that might be capable of furthering the development of the disk.

## Examples

* Cartwheel Galaxy, lenticular galaxy about 500 million light-years away in the constellation Sculptor
* NGC 2787, a barred lenticular galaxy
* NGC 3115
* NGC 3632
* NGC 4608, a barred lenticular galaxy about 56 million light years away in Virgo
* NGC 5866
* NGC 1533 is a prototypical lenticular galaxy in the constellation Dorado

## Gallery

* NGC 1222 contains three compact regions.[32]

* PGC 83677 image obtained as part of the Coma Cluster Survey[33]

* Lenticular galaxy NGC 5308 is located just under 100 million light-years away in the constellation of Ursa Major.[34]

* NGC 4111 is a lenticular galaxy, lying about 50 million light-years away in the constellation of Canes Venatici.[35]

* Mrk 820 is a lenticular galaxy classified as type S0 on the Hubble Tuning Fork.[36]

* Messier 84 is a lenticular galaxy also known for its supernovae.[37]

* NGC 6861 is a lenticular galaxy discovered in 1826 by the Scottish astronomer James Dunlop.[38]

* Cartwheel Galaxy

## See also

* Spindle galaxy - Class of galaxy that is cigar shaped and rotates around its long axis

## Notes

1. ↑ Galaxies to the left side of the Hubble classification scheme are sometimes referred to as "early-type", while those to the right are "late-type".

## References

1. ↑ R. J. Buta; H. G. Corwin, Jr.; S. C. Odewahn (2007s). The de Vaucouleurs Atlas of Galaxies. Cambridge: Cambridge University. ISBN 978-0521820486.
2. ↑ DeGraaff, Regina Barber; Blakeslee, John P.; Meurer, Gerhardt R.; Putman, Mary E. (December 2007). "A Galaxy in Transition: Structure, Globular Clusters, and Distance of the Star-Forming S0 Galaxy NGC 1533 in Dorado". The Astrophysical Journal 671 (2): 1624–1639. doi:10.1086/523640. Bibcode: 2007ApJ...671.1624D.
3. ↑ Liller, M.H. (1966), The Distribution of Intensity in Elliptical Galaxies of the Virgo Cluster. II
4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Binney & Merrifield (1998). Galactic Astronomy. Princeton University Press. ISBN 0-691-02565-7.
5. ↑ Lambas, D.G.; S.J.Maddox and J. Loveday (1992). "On the true shapes of galaxies". MNRAS 258 (2): 404–414. doi:10.1093/mnras/258.2.404. Bibcode: 1992MNRAS.258..404L.
6. ↑ Laurikainen, Eija; Salo, Heikki; Buta, Ronald (2005), Multicomponent decompositions for a sample of S0 galaxies
7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Blanton, Michael; John Moustakas (2009). "Physical Properties and Environments of Nearby Galaxies". Annual Review of Astronomy and Astrophysics 47 (1): 159–210. doi:10.1146/annurev-astro-082708-101734. Bibcode: 2009ARA&A..47..159B.
8. ↑ Andredakis, Y. C.; Peletier, R. F.; Balcells, M. (2016), The Shape of the Luminosity Profiles of Bulges of Spiral Galaxies
9. ↑ Alister W. Graham and Clare C. Worley(2016), Inclination- and dust-corrected galaxy parameters: bulge-to-disc ratios and size-luminosity relations
10. ↑ G. A. D. Savorgnan and G. W. Graham (2016), Supermassive Black Holes and Their Host Spheroids. I. Disassembling Galaxies
11. ↑ Shaw, M. A. (1987-12-01). "The nature of 'box' and 'peanut' shaped galactic bulges" (in en). Monthly Notices of the Royal Astronomical Society 229 (4): 691–706. doi:10.1093/mnras/229.4.691. ISSN 0035-8711.
12. ↑ "A galaxy in bloom". http://www.spacetelescope.org/news/heic1516/.
13. ↑ "A stranger in the crowd". ESA/Hubble Picture of the Week. http://www.spacetelescope.org/images/potw1328a/.
14. ↑ 14.0 14.1 14.2 Moran, Sean M.; Boon Liang Loh; Richard S. Ellis; Tommaso Treu; Kevin Bundy; Lauren MacArthur (20 August 2007). "The Dynamical Distinction Between Elliptical and Lenticular Galaxies in Distant Clusters: Further Evidence for the Recent Origin of S0 Galaxies". The Astrophysical Journal 665 (2): 1067–1073. doi:10.1086/519550. Bibcode: 2007ApJ...665.1067M.
15. ↑ Alister W. Graham et al. (2017), Implications for the Origin of Early-type Dwarf Galaxies: A Detailed Look at the Isolated Rotating Early-type Dwarf Galaxy LEDA 2108986 (CG 611), Ramifications for the Fundamental Plane's SK2 Kinematic Scaling, and the Spin-Ellipticity Diagram
16. ↑ Sabine Bellstedt et al. (2017), The SLUGGS Survey: trails of SLUGGS galaxies in a modified spin-ellipticity diagram
17. ↑ Bedregal, A.G.; A. Aragon-Salamanca; M.R. Merrifield; B. Milvang-Jensen (October 2006). "S0 Galaxies in Fornax: data and kinematics". Monthly Notices of the Royal Astronomical Society 371 (4): 1912–1924. doi:10.1111/j.1365-2966.2006.10829.x. Bibcode: 2006MNRAS.371.1912B.
18. ↑ Bedregal, A. G.; A. Aragon-Salamanca; M. R. Merrifield (December 2006). "The Tully-Fisher relation for S0 galaxies". Monthly Notices of the Royal Astronomical Society 373 (3): 1125–1140. doi:10.1111/j.1365-2966.2006.11031.x. Bibcode: 2006MNRAS.373.1125B.
19. ↑ Courteau, Stephane; Aaron A. Dutton; Frank C. van den Bosch; Lauren A. MacArthur; Avishai Dekel; Daniel H. McIntosh; Daniel A. Dale (10 December 2007). "Scaling Relations of Spiral Galaxies". The Astrophysical Journal 671 (1): 203–225. doi:10.1086/522193. Bibcode: 2007ApJ...671..203C.
20. ↑ Graham, Alister W.; Dullo, Bililign T.; Savorgnan, Giulia A. D. (2015), Hiding in Plain Sight: An Abundance of Compact Massive Spheroids in the Local Universe
21. ↑ Sidney van den Bergh (2012). "Luminosities of Barred and Unbarred S0 Galaxies". The Astrophysical Journal 754 (1): 68. doi:10.1088/0004-637X/754/1/68. Bibcode: 2012ApJ...754...68V.
22. ↑ Janz et al. (2017), Implications for the origin of early-type dwarf galaxies - the discovery of rotation in isolated, low-mass early-type galaxies
23. ↑ Elmegreen, Debra; Bruce G. Elmegreen; Jay A. Frogel; Paul B. Eskridge; Richard W. Pogge; Andrew Gallagher; Joel Iams (2002). "Arm Structure in Anemic Spiral Galaxies". The Astronomical Journal 124 (2): 777–781. doi:10.1086/341613. Bibcode: 2002AJ....124..777E.
24. ↑ Moore, Ben; George Lake; Neal Katz (1998). "Morphological Transformation from Galaxy Harassment". The Astrophysical Journal 495 (1): 139–151. doi:10.1086/305264. Bibcode: 1998ApJ...495..139M.
25. ↑ Kormendy, John; Ralf Bender (2012). "A Revised Parallel-sequence Morphological Classification of Galaxies: Structure and Formation of S0 and Spheroidal Galaxies". The Astrophysical Journal Supplement 198 (1): 2. doi:10.1088/0067-0049/198/1/2. Bibcode: 2012ApJS..198....2K.
26. ↑ Burstein, D; Ho LC; Huchra JP; Macri LM (2005). "TheK-Band Luminosities of Galaxies: Do S0s Come from Spiral Galaxies?". The Astrophysical Journal 621 (1): 246–55. doi:10.1086/427408. Bibcode: 2005ApJ...621..246B.
27. ↑ Sandage, A (2005). "THE CLASSIFICATION OF GALAXIES: Early History and Ongoing Developments". Annual Review of Astronomy and Astrophysics 43 (1): 581–624. doi:10.1146/annurev.astro.43.112904.104839. Bibcode: 2005ARA&A..43..581S.
28. ↑ Dressler, A; Gilmore, Diane M. (1980). "On the interpretation of the morphology-density relation for galaxies in clusters". The Astrophysical Journal 236: 351–65. doi:10.1086/169602. Bibcode: 1991ApJ...367...64W.
29. ↑ Christlein, D; Zabludoff AI (2004). "Can Early-Type Galaxies Evolve from the Fading of the Disks of Late-Type Galaxies?". The Astrophysical Journal 616 (1): 192–98. doi:10.1086/424909. Bibcode: 2004ApJ...616..192C.
30. ↑ Laurikainen, Eija; Heikki Salo; Ronald Buta (October 2005). "Multicomponent decompositions for a sample of S0 galaxies". MNRAS 362 (4): 1319–1347. doi:10.1111/j.1365-2966.2005.09404.x. Bibcode: 2005MNRAS.362.1319L.
31. ↑ Graham, Alister W. (2013), Elliptical and Disk Galaxy Structure and Modern Scaling Laws
32. ↑ "A greedy giant". https://www.spacetelescope.org/images/potw1645a/.
33. ↑ "Standing out from the crowd". http://www.spacetelescope.org/images/potw1637a/.
34. ↑ "Busy bees". http://www.spacetelescope.org/images/potw1620a/.
35. ↑ "Elegance conceals an eventful past". http://www.spacetelescope.org/images/potw1616a/.
36. ↑ "At the centre of the tuning fork". http://www.spacetelescope.org/images/potw1544a/.
37. ↑ "A fascinating core". http://www.spacetelescope.org/images/potw1522a/.
38. ↑ "The third way of galaxies". ESA/Hubble. http://www.spacetelescope.org/images/potw1502a/.

* v
* t
* e

Galaxies

Morphology|

* Disc
* Lenticular
* barred
* unbarred
* Spiral
* anemic
* barred
* flocculent
* grand design
* intermediate
* Magellanic
* unbarred
* Dwarf galaxy
* elliptical
* irregular
* spheroidal
* spiral
* Elliptical galaxy
* cD
* Irregular
* barred
* Peculiar
* Ring
* Polar

Structure|

* Active galactic nucleus
* Bar
* Bulge
* Dark matter halo
* Disc
* Disc galaxy
* Halo
* corona
* Galactic center
* Galactic plane
* Galactic ridge
* Interstellar medium
* Protogalaxy
* Spiral arm
* Supermassive black hole

Active nuclei|

* Blazar
* LINER
* Markarian
* Quasar
* Radio
* X-shaped
* Relativistic jet
* Seyfert

Energetic galaxies|

* Lyman-alpha emitter
* Luminous infrared
* Starburst
* blue compact dwarf
* pea
* faint blue
* Hot dust-obscured

Low activity|

* Low surface brightness
* Ultra diffuse
* Dark galaxy

Interaction|

* Field
* Galactic tide
* Cloud
* Groups and clusters
* group
* cluster
* Brightest cluster galaxy
* fossile group
* Interacting
* merger
* Jellyfish
* Satellite
* Stellar stream
* Superclusters
* Walls
* Voids and supervoids
* void galaxy

Lists|

* Galaxies
* Galaxies named after people
* Largest
* Nearest
* Polar-ring
* Ring
* Spiral
* Groups and clusters
* Large quasar groups
* Quasars

* Superclusters
* Voids

See also|

* Extragalactic astronomy
* Galactic astronomy
* Galactic coordinate system
* Galactic empire
* Galactic habitable zone
* Galactic magnetic fields
* Galactic orientation
* Galactic quadrant
* Galaxy color–magnitude diagram
* Galaxy formation and evolution
* Galaxy rotation curve
* Illustris project
* Intergalactic dust
* Intergalactic stars
* Intergalactic travel
* Population III stars

* Book
* Category
* Portal

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Lenticular galaxy. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Lenticular_galaxy&oldid=4343005"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template