NGC 90

NGC 90 (center) with its spiral companion NGC 93 to the right. NGC 91 can also be seen below.

Observation data (J2000 epoch)
Constellation| Andromeda
Right ascension|  00h 21m 51.4s [1]
Declination| +22° 24′ 00″[1]
Redshift| 0.017856[2]
Helio radial velocity| 5353 ± 10 km/s[2]
Distance| 333.8 ± 146 Mly
(102.35 ± 44.76 Mpc)[2]
Apparent magnitude (V)| 13.7 [3]
Characteristics
Type| SAB(s)c pec [2]
Mass| ~4.9 × 10^10 M⊙ M☉
Apparent size (V)| 2.4' x 0.91' [2]
Notable features| Interaction with NGC 93, tidal tails and large H I cloud
Other designations
UGC 208, MCG+04-02-011, PGC 1405,[2] Arp 65

NGC 90 is a grand-design spiral galaxy estimated to be about 333 million light years (102 megaparsecs) away in the constellation of Andromeda. The galaxy is currently interacting with NGC 93 and exhibits two highly elongated and distorted spiral arms. These arms have bright blue star clusters which is indicative of star formation, likely caused by the interaction with its neighbor. NGC 90 and NGC 93 form the interacting galaxy pair Arp 65 in the Atlas of Peculiar Galaxies. Its interaction with NGC 93 has caused it produced characteristic similar to jellyfish galaxies such as tidal tails and escaping clouds of gas.[4]

It was discovered by R. J. Mitchell in 1854 and its apparent magnitude is 13.7.[3]

## Contents

* 1 Morphology
* 2 Characteristics
* 2.1 Cloud
* 3 References

## Morphology

NGC 90 is a grand-design spiral galaxy with two tidal arms extending from the main grand design arms. They are thin and long with one being aimed towards the northwest of the galaxy and a smoother, shorter one pointing in the opposite direction. These tidal tails straighten out towards the periphery.[4]

## Characteristics

NGC 90 is interacting with another spiral galaxy located 64 kiloparsecs away, known as NGC 93, together forming Arp 65. A interaction with NGC 93 occurred roughly 100-250 million years ago displacing a large amount of gas far beyond its main disk. This interaction has caused two tidal tails extending from the galaxy. Along the western tidal tail and east of the disk, there are several regions of star formation outside the main disk of the galaxy. Evidence for this can be seen with images of bright blue regions which is indicative of star formation regions and populations of young stars.[4][5]

The central regions of the galaxy is affected by photoionization creating shocks.[4]

### Cloud

Perhaps the most interesting thing about NGC 90 is its large H I cloud located southeast of the galaxy. This cloud has a mass of 6.8 × 109 solar masses[5] meaning that this cloud contains about half of the galaxies total gas content in terms of mass. It is being displaced outwards from the galaxy traveling at a velocity of around 340 km/s. At velocities this high, it is not gravitationally bounded to NGC 90. The cause of this cloud and its speed is likely due to forces of ram pressure stripping being applied to NGC 90 as it travels through the hot gas of the galaxy group. This means that NGC 90 could be a potential jellyfish galaxy. Another factor influencing the loss of gas in NGC 90 is the interaction with the more gas-rich companion.[4]

H I clouds were only marginally detected in the main galaxy. The clouds that were detected has an asymmetric morphology.[5]

## References

| Wikimedia Commons has media related to Arp 65.

|

1. ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. https://ui.adsabs.harvard.edu/abs/2006AJ....131.1163S/abstract.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "NED results for object NGC 0090". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. 2008. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+90&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
3. ↑ 3.0 3.1 "NGC Objects: NGC 50 - 99". http://cseligman.com/text/atlas/ngc0a.htm#90.
4. ↑ 4.0 4.1 4.2 4.3 4.4 V, Zasov, Anatoly; S, Saburova, Anna; V, Egorov, Oleg; V, Moiseev, Alexey (2020-09-25). "NGC 90: a hidden jellyfish galaxy?" (in en). Monthly Notices of the Royal Astronomical Society 498 (1). doi:10.1093/mnra. ISSN 0035-8711. https://academic.oup.com/mnras/article/498/1/101/5881317.
5. ↑ 5.0 5.1 5.2 Sengupta, C.; Scott, T. C.; Paudel, S.; Saikia, D. J.; Dwarakanath, K. S.; Sohn, B. W. (2015-12-01). "Arp 65 interaction debris: massive H I displacement and star formation" (in en). Astronomy & Astrophysics 584: A114. doi:10.1051/0004-6361/201425149. ISSN 0004-6361. https://www.aanda.org/articles/aa/abs/2015/12/aa25149-14/aa25149-14.html.

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* Astronomical catalog
* List of NGC objects

* v
* t
* e

Astronomical catalogs

NGC|

* Astronomy:NGC 85
* Astronomy:NGC 86
* Astronomy:NGC 87
* Astronomy:NGC 88
* Astronomy:NGC 89
* NGC 90
* Astronomy:NGC 91
* Astronomy:NGC 92
* Astronomy:NGC 93
* Astronomy:NGC 94
* Astronomy:NGC 95

PGC|

* Astronomy:PGC 1401
* Astronomy:PGC 1402
* Astronomy:PGC 1403
* Astronomy:PGC 1404
* PGC 1405
* Astronomy:PGC 1406
* Astronomy:PGC 1407
* Astronomy:PGC 1408
* Astronomy:PGC 1409

UGC|

* Astronomy:UGC 204
* Astronomy:UGC 205
* Astronomy:UGC 206
* Astronomy:UGC 207
* UGC 208
* Astronomy:UGC 209
* Astronomy:UGC 210
* Astronomy:UGC 211
* Astronomy:UGC 212

Arp|

* Astronomy:Arp 59
* Astronomy:Arp 60
* Astronomy:Arp 61
* Astronomy:Arp 62
* Astronomy:Arp 63
* Astronomy:Arp 64
* Arp 65
* Astronomy:Arp 66
* Astronomy:Arp 67
* Astronomy:Arp 68
* Astronomy:Arp 69
* Astronomy:Arp 70
* Astronomy:Arp 71

* v
* t
* e

Constellation of Andromeda

* Adhil
* Andromeda in Chinese astronomy
* List of Andromeda's satellite galaxies
* List of stars in Andromeda

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

|

Flamsteed|

* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9
* 10
* 11
* 12
* 13
* 14
* 15
* 18
* 22
* 23
* 26
* 28
* 32
* 36
* 39
* 41
* 44
* 45
* 47
* 49
* 51
* 55
* 56
* 58
* 59
* 60
* 62
* 63
* 64
* 65
* 66

Variable|

* R
* T
* U
* W
* Z
* RT
* RU
* RV
* RX
* SU
* SW
* TU
* TW
* WZ
* XZ
* AB
* AC
* AD
* AE
* AR
* BM
* BX
* CC
* CN
* DS
* DX
* EG
* ET
* EU
* FF
* GP
* GR
* GY
* HN
* KK
* KX
* KZ
* LL
* LP
* LQ
* OP
* OS
* OU
* PX
* QR
* QV
* QX
* V385
* V455
* V529

HD|

* 3
* 166
* 895
* 1185
* 1606
* 2421
* 2767
* 2942
* 3322
* 3346
* 4778
* 5608
* 5789/5788
* 6114
* 7853
* 8673
* 10307
* 13931
* 14622
* 15082
* 16004
* 16028
* 16175
* 217811
* 220105
* 221246
* 221776
* 222109
* 222399
* 223229
* 224365
* 224801
* 225218

Other|

* 3XMM J004232.1+411314
* 6 Persei
* ADS 48
* Groombridge 34
* HAT-P-6
* HR 178
* HR 8768
* M31-RV
* NGC 44
* NGC 82
* NGC 84
* NGC 91
* NGC 162
* NGC 464
* PA-99-N2
* Ross 248
* WASP-1
* WISE 0146+4234
* WISE J0005+3737
* WISE J004945.61+215120.0

| Exoplanets|

* 14 Andromedae b
* Upsilon Andromedae b
* c
* d
* e
* Gliese 15 Ab
* HD 13931 b
* HD 16175 b
* HAT-P-6b
* HAT-P-32b
* WASP-1b
* WASP-33b

|

| Star clusters|

* Mayall II
* NGC 206
* NGC 272
* NGC 752
* NGC 956
* NGC 7686

|

| Nebulae|

* NGC 7662

|

Galaxies|

| NGC|

* 5
* 11
* 13
* 19
* 21
* 20
* 27
* 39
* 43
* 48
* 49
* 51
* 67
* 68
* 69
* 70
* 71
* 72
* 74
* 76
* 79
* 80
* 81
* 83
* 85
* 86
* 90
* 93
* 94
* 96
* 97
* 108
* 109
* 112
* 140
* 149
* 160
* 169
* 181
* 183
* 184
* 214
* 218
* 226
* 228
* 229
* 233
* 243
* 252
* 258
* 260
* 262
* 280
* 304
* 317
* 389
* 393
* 404
* 425
* 431
* 477
* 478
* 512
* 513
* 523
* 528
* 536
* 668
* 679
* 687
* 700
* 703
* 704
* 705
* 708
* 709
* 710
* 712
* 714
* 717
* 732
* 753
* 759
* 891
* 1000
* 7640
* 7836

|

Numbered|

* I
* II
* III
* IV
* V
* VIII
* IX
* X
* XI
* XVIII
* XIX
* XXI

Other|

* 3C 66A
* 3C 66B
* Andromeda Galaxy
* Donatiello I
* Messier 32
* Messier 110

| Galaxy clusters|

* Abell 262
* NGC 68 group

|

| Astronomical events|

* GRB 101225A
* SN 1885A

|

Category

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Original source: https://en.wikipedia.org/wiki/NGC 90. Read more

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