# Abell 1991

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Galaxy cluster in the constellation of Boötes

Abell 1991 Observation data (Epoch J2000) Constellation Boötes Right ascension 14h 54m 30.2s[1] Declination +18° 37′ 51″[1] Richness class 1 [2] Bautz–Morgan classification I [2] Redshift 0.05870 (17 598)[1] Distance 249 Mpc (812 Mly) h−1 0.705 [1] ICM temperature 2.61 keV[3] Binding mass 1.23×1014[3] M☉ X-ray flux (9.40 ± 16.7%)×10−12 erg s−1 cm−2 (0.1–2.4 keV)[1]

**Abell 1991** is a [galaxy cluster](/source/Galaxy_cluster) in the [Abell catalogue](/source/Abell_catalogue).

## See also

- [Abell catalogue](/source/Abell_catalogue)

- [List of Abell clusters](/source/List_of_Abell_clusters)

## References

1. ^ [***a***](#cite_ref-NED_1-0) [***b***](#cite_ref-NED_1-1) [***c***](#cite_ref-NED_1-2) [***d***](#cite_ref-NED_1-3) [***e***](#cite_ref-NED_1-4) ["NED results for object ABELL 1991"](http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=Abell+1991&extend=no). NASA/IPAC Extragalactic Database (NED). Retrieved March 17, 2012.

1. ^ [***a***](#cite_ref-ACO_2-0) [***b***](#cite_ref-ACO_2-1) [Abell, George O.](/source/George_O._Abell); [Corwin, Harold G. Jr.](https://en.wikipedia.org/w/index.php?title=Harold_G._Corwin&action=edit&redlink=1); [Olowin, Ronald P.](https://en.wikipedia.org/w/index.php?title=Ronald_P._Olowin&action=edit&redlink=1) (May 1989). ["A catalog of rich clusters of galaxies"](https://doi.org/10.1086%2F191333). *Astrophysical Journal Supplement Series*. **70** (May 1989): 1–138. [Bibcode](/source/Bibcode_(identifier)):[1989ApJS...70....1A](https://ui.adsabs.harvard.edu/abs/1989ApJS...70....1A). [doi](/source/Doi_(identifier)):[10.1086/191333](https://doi.org/10.1086%2F191333). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

1. ^ [***a***](#cite_ref-Vikhlinin_3-0) [***b***](#cite_ref-Vikhlinin_3-1) Table 4 from Vikhlinin, A.; Kravtsov, A.; Forman, W.; Jones, C.; Markevitch, M.; Murray, S. S.; Van Speybroeck, L. (April 2006). "Chandra Sample of Nearby Relaxed Galaxy Clusters: Mass, Gas Fraction, and Mass-Temperature Relation". *The Astrophysical Journal*. **640** (2). Chicago, Illinois, USA: 691–709. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0507092](https://arxiv.org/abs/astro-ph/0507092). [Bibcode](/source/Bibcode_(identifier)):[2006ApJ...640..691V](https://ui.adsabs.harvard.edu/abs/2006ApJ...640..691V). [doi](/source/Doi_(identifier)):[10.1086/500288](https://doi.org/10.1086%2F500288). [S2CID](/source/S2CID_(identifier)) [18940822](https://api.semanticscholar.org/CorpusID:18940822).

v t e Astronomical catalogs Abell Abell 1986 Abell 1987 Abell 1988 Abell 1989 Abell 1990 Abell 1991 Abell 1992 Abell 1993 Abell 1994 Abell 1995 Abell 1996

v t e Galaxies Morphology Disc Thick disk Thin disk 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 Central massive object Galactic Center Dark matter halo Disc Disc galaxy Halo corona Galactic plane Galactic ridge Interstellar medium Protogalaxy Galaxy filament Spiral arm Supermassive black hole Ultramassive Active nuclei Blazar BL Lacertae object LINER Little red dot Markarian Quasar Radio X-shaped DRAGN Relativistic jet Seyfert Energetic galaxies Lyman-alpha emitter Lyman-break Luminous infrared ULIRG HLIRG ELIRG Starburst blue compact dwarf blueberry pea faint blue Luminous infrared galaxy Hot dust-obscured Green bean galaxy Hanny's Voorwerp Wolf-Rayet galaxy Low activity Low surface brightness Ultra diffuse Dark galaxy Red nugget Blue Nugget Dead disk Interaction Binary galaxy Field Galactic tide Groups and clusters group cluster Brightest cluster galaxy fossil group Interacting merger collision cannibalism Jellyfish Satellite Stellar stream Superclusters Walls Voids and supervoids void galaxy Lists Galaxies Galaxies named after people Largest Smallest Nearest Polar-ring Ring Spiral Groups and clusters Large quasar groups Quasars List of the most distant astronomical objects Starburst galaxies Superclusters Voids Related Extragalactic astronomy Galactic astronomy Galactic coordinate system Galactic habitable zone Galactic magnetic fields Galactic orientation Galactic quadrant Galaxy color–magnitude diagram Galaxy formation and evolution Galaxy rotation curve Gravitational lens Gravitational microlensing Illustris project Intergalactic dust Intergalactic stars Intergalactic travel Population III stars Galaxy X (galaxy) Category Portal

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