Astronomy:Abell 2218 BCG

From HandWiki
Abell 2218 BCG
File:Image of Abell 2218 BCG.png
Pan-STARRS image of Abell 2218 BCG
Observation data (J2000.0 epoch)
ConstellationDraco
Right ascension 16h 35m 49.12s[1]
Declination+66° 12′ 33.88″[1]
Redshift0.172000[1]
Helio radial velocity51,564 ± 120 km/s[1]
Distance2,489.4 ± 174.5 Mly (763.25 ± 53.49 Mpc)[1]
Group or clusterAbell 2218
Characteristics
TypecD;E[1]
Size~600,000 ly (183.9 kpc) (estimated)[1]
Other designations
2MASX J16354949+6612360, Abell 2218:[BOW83] 008, LEDA 140648, 2MFGC 13294, [HMD2010] J163549.1+661233.9[1]

Abell 2218 BCG (Short for Abell 2218 Brightest Cluster Galaxy) is a massive elliptical galaxy of type-cD located in the constellation of Draco. The redshift of the galaxy is (z) 0.172[1] and it was first discovered in January 1988 by astronomers who noted curved structures around it.[2] It is the brightest cluster galaxy of Abell 2218, a luminous Bautz-Morgan class II galaxy cluster.[3][4]

Description

Abell 2218 BCG is the central dominant galaxy of Abell 2218.[4][5] The galaxy has a low surface brightness central profile and a single nucleus. Its galactic envelope is best described by a de Vaucouleurs law profile and is more than 180 kiloparsecs in length.[6][2] The ellipticity increases in an outward direction with the isothopes in the innermost region at the radius of one arcsecond depicted as circularized. The BCG's major axis decreases along with its radius, with the twist angle being around 8°.[6]

The total stellar population of the BCG is estimated to be aged 9.8 ± 2.8 billion years, with a stellar mass of 102.1 ± 2.6 × 1010 Mʘ.[7] The U – R color is 0.02 ± 0.10 magnitude with a U – R color gradient of -0.41 ± 0.11 magnitude per dex-1.[5] A study published in July 1999, has found the optical spectrum of the BCG shows the absence of emission lines.[8] The central core of the BCG has a red appearance based on its inner color profile shape with the r' best surface brightness profile parameter being 23.60+0.14-0.17 magnitude.[9]

There are two faint resolved arc structures extending from east to west around the BCG. The first arc is the brightest, with a curvature radius of 130 ± 20 kiloparsecs and is located from the center. The second arc is faint, with both a bright part and a faint extension. This faint arc has a curvature radius of 100 kiloparsecs and is situated 20 kiloparsecs from the BCG's center from south to east.[2]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "NED Search results for Abell 2218 BCG (LEDA 140648)". https://ned.ipac.caltech.edu/byname?objname=LEDA+140648&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  2. ↑ 2.0 2.1 2.2 Pello-Descayre, R.; Soucail, G.; Sanahuja, B; Mathez, G.; Ojero, E. (January 1988). "Detection and photometry of a complex system in the center of the A 2218 cluster of galaxies.". https://articles.adsabs.harvard.edu/pdf/1988A%26A...190L..11P. 
  3. ↑ Egami, E.; Misselt, K. A.; Rieke, G. H.; Wise, M. W.; Neugebauer, G.; Kneib, J.-P.; Le Floc’h, E.; Smith, G. P. et al. (2006-08-20). "Spitzer Observations of the Brightest Galaxies in X-Ray-Luminous Clusters". The Astrophysical Journal 647 (2): 922–933. doi:10.1086/504519. ISSN 0004-637X. Bibcode: 2006ApJ...647..922E. 
  4. ↑ 4.0 4.1 McHardy, I. M.; Stewart, G. C.; Edge, A. C.; Cooke, B.; Yamashita, K.; Hatsukade, I. (January 1990). "GINGA observations of Abell 2218: implications for H0". Monthly Notices of the Royal Astronomical Society 242 (2): 215–220. doi:10.1093/mnras/242.2.215. ISSN 0035-8711. https://articles.adsabs.harvard.edu/pdf/1990MNRAS.242..215M. 
  5. ↑ 5.0 5.1 Rafferty, D. A.; McNamara, B. R.; Nulsen, P. E. J. (2008-11-10). "The Regulation of Cooling and Star Formation in Luminous Galaxies by Active Galactic Nucleus Feedback and the Cooling-Time/Entropy Threshold for the Onset of Star Formation". The Astrophysical Journal 687 (2): 899–918. doi:10.1086/591240. ISSN 0004-637X. Bibcode: 2008ApJ...687..899R. 
  6. ↑ 6.0 6.1 Kneib, J. P.; Y., Mellier; Pello, R.; Miralda-Escude, J.; Le Borgne, J.-F.; Boehringer, H.; Picat, J.-P. (November 1995). "Dynamics of Abell 2218 from optical and near-IR imagery of arc(let)s and the ROSAT/HRI X-ray map.". Astronomy and Astrophysics 303: 27. Bibcode: 1995A&A...303...27K. 
  7. ↑ Sánchez, S. F.; Cardiel, N.; Verheijen, M. A. W.; Pedraz, S.; Covone, G. (2007-03-21). "Morphologies and stellar populations of galaxies in the core of Abell 2218". Monthly Notices of the Royal Astronomical Society 376 (1): 125–150. doi:10.1111/j.1365-2966.2007.11335.x. ISSN 0035-8711. Bibcode: 2007MNRAS.376..125S. 
  8. ↑ Crawford, C. S.; Allen, S. W.; Ebeling, H.; Edge, A. C.; Fabian, A. C. (1999-07-11). "The ROSAT Brightest Cluster Sample -- III. Optical spectra of the central cluster galaxies". Monthly Notices of the Royal Astronomical Society 306 (4): 857–896. doi:10.1046/j.1365-8711.1999.02583.x. ISSN 0035-8711. Bibcode: 1999MNRAS.306..857C. 
  9. ↑ Bildfell, Chris; Hoekstra, Henk; Babul, Arif; Mahdavi, Andisheh (2008-08-26). "Resurrecting the red from the dead: optical properties of BCGs in X-ray luminous clusters". Monthly Notices of the Royal Astronomical Society 389 (4): 1637–1654. doi:10.1111/j.1365-2966.2008.13699.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389.1637B. 




Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Abell_2218_BCG&oldid=4393671"