CID-42

Short description: Galaxy Merger That Is Also A Quasar, With An Elongated Arm And An Ejected Black Hole

Coordinates:  10h 00m 43.13s, +02° 06′ 37.40″

CID-42

Optical and X-ray images of CID-42

Observation data (J2000 epoch)
Constellation| Sextans
Right ascension|  10h 00m 43.13s
Declination| +02° 06′ 37.40″
Redshift| 0.359[1]
Helio radial velocity| 89302 km/s[2]
Distance| 3.9 billion[3]
Apparent magnitude (V)| ?
Characteristics
Type| Spiral
Mass| 4.5x1011[1] M☉
Number of stars| ?
Apparent size (V)| ?
Other designations
CXOC J100043.1+020637 2XMM J100043.1+020637

CID-42 (also known as CXOC J100043.1+020637[4]) is a galaxy quasar about 3.9 billion light years away in the constellation Sextans. It is believed to have a supermassive black hole at its center.

## Contents

* 1 Description
* 2 Black hole
* 3 References
* 4 External links

## Description

CID-42 is thought to be the result of a galaxy collision between two smaller galaxies. It has a distinctive trail of stars extending many light years.[3]

## Black hole

The discovery of a potential black hole was made after combining through the data and images taken by several telescopes including NASA's Chandra X-ray Observatory, the Hubble Space Telescope, the Canada-France-Hawaii Telescope and from the ground-based Magellan and Very Large Telescopes in Chile .[5]

When the two galaxies collided the black holes in their centers collided, forming a single supermassive black hole. The black hole then recoiled from the gravitational waves produced by the merger and is being ejected out of the galaxy at several million miles per hour (~2000 km s−1).[1][6]

Once ejected it is expected to shine as a displaced quasar for 10 million to 10 billion years until it exhausts its fuel and is no longer recognizable as a quasar.[7]

JWST NIRCam observations were able to rule out the gravitational wave producing recoiling black hole sencario. Instead CID-42 is a merging galaxy with only one active galactic nucleus.[8]

## References

1. ↑ 1.0 1.1 1.2 Blecha, Laura; Civano, Francesca (October 4, 2012). "Constraints on the Nature of CID-42". Monthly Notices of the Royal Astronomical Society 428 (2): 1341–1350. doi:10.1093/mnras/sts114. Bibcode: 2013MNRAS.428.1341B.
2. ↑ "3XMM J100043.1+020637". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=3XMM+J100043.1+020637.
3. ↑ 3.0 3.1 "CID-42". Chandra.Harvard.edu. June 4, 2012. http://chandra.harvard.edu/photo/2012/cid42/. Retrieved September 28, 2012.
4. ↑ Civano, F; Elvis, M; Lanzuisi, G; Jahnke, K; Zamorani, G; Blecha, L; Bongiorno, A; Brusa, M et al. (June 9, 2010). "A Runaway Black Hole in COSMOS". The Astrophysical Journal 717 (1): 209. doi:10.1088/0004-637X/717/1/209. Bibcode: 2010ApJ...717..209C.
5. ↑ "Giant Black Hole Kicked from Home Galaxy". Chandra.Harvard.edu. June 4, 2012. http://chandra.harvard.edu/press/12_releases/press_060412.html. Retrieved September 28, 2012.
6. ↑ "Supermassive black hole ejected from host galaxy". Space.com. June 6, 2012. http://www.space.com/16031-supermassive-black-hole-ejected-host-galaxy.html. Retrieved September 28, 2012.
7. ↑ Civano, F et al. (April 10, 2012). "Chandra High resolution Observations of CID-42, a candidate recoiling SMBH". Astrophysical Journal 752 (1): 49. doi:10.1088/0004-637X/752/1/49. Bibcode: 2012ApJ...752...49C.
8. ↑ Li, Junyao; Zhuang, Ming-Yang; Shen, Yue (2023). "JWST Confirms the Nature of CID-42". arXiv:2307.05852 [astro-ph.GA].

## External links

* CID-42: Simulation of Black Hole Ejection Simulation of collision and ejection

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