SDSS J112155.27+104923.2

SDSS J112155.27+104923.2
DESI Legacy Surveys image of SDSS J112155.27+104923.2
Observation data (J2000.0 epoch)
ConstellationLeo
Right ascension11h 21m 55.31s[1]
Declination+10° 49′ 23.09″[1]
Redshift0.240504[1]
Heliocentric radial velocity72,101 ± 7 km/s[1]
Distance3,485.5 ± 244.0 Mly (1,068.65 ± 74.81 Mpc)[1]
Group or clusterWHL J112155.3+104923
magnitude (K)14.34[1]
Characteristics
TypeBrClG[1]
Size~615,000 ly (188.5 kpc) (estimated)[1]
Other designations
2MASX J11215527+1049232, [HWH2012] 12, LEDA 1385000, [LHC2018] J170.48035+10.82310, NVSS J112155+104927, WHL J112155.3+104923 BCG[1]

SDSS J112155.27+104923.2 is an elliptical galaxy located in the constellation of Leo. The redshift of the galaxy is estimated to be (z) 0.240[1] and it was first discovered by astronomers in October 2007, from a sample of fossil groups in the Sloan Digital Sky Survey (SDSS).[2]

Description

SDSS J112155.27+104923.2 is an elliptical galaxy residing as the brightest cluster galaxy of the WHL J112155.3+104923 galaxy cluster with 23 confirmed galaxy member candidates. The R-band magnitude of the galaxy is 17.14 while the total stellar mass of the galaxy is 11.24 M☉.[3][4][5] The absolute magnitude of the galaxy is -23.84 magnitude.[2]

It is also categorized as a fossil galaxy dominating the fossil group called FGS 12,[6] with its total X-ray luminosity estimated to be 3.85 × 1043 erg/s while the velocity dispersion is 251 ± 21 kilometers per seconds. The effective surface brightness is 18.61 ± 0.34 magnitudes per square arcsecond while its effective radius is 11.1 ± 3.0 kiloparsec. The position angle of the galaxy is orientated at 100.9 ± 3.0°.[7]

The galaxy is found to contain an active galactic nucleus. Radio imaging made with Very Large Array at 1.4 GHz, finds the radio source is mainly point-like and elongated with the total radio extent being 11.0 arcseconds and has an root mean square noise of 57 ɥJy beam−1.[8] The total radio flux density is estimated to be 4.8 mJy while the total radio luminosity is 23.90 W Hz−1.[5] A study suggested the source is mainly elongated depicted as a single elliptical component with the radio core detected by Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) having a flux density of 4.19 mJy.[3]

References

  1. 1 2 3 4 5 6 7 8 9 10 "NED Search results for SDSS J112155.27+104923.2". NASA/IPAC Extragalactic Database. Retrieved 2026-06-26.
  2. 1 2 Santos, Walter A.; Mendes de Oliveira, Claudia; Sodré Jr., Laerte (2007-08-23). "Fossil Groups in the Sloan Digital Sky Survey". The Astronomical Journal. 134 (4): 1551–1559. arXiv:0708.1945. Bibcode:2007AJ....134.1551S. doi:10.1086/521341. ISSN 0004-6256.
  3. 1 2 Kozieł-Wierzbowska, Dorota; Goyal, Arti; Żywucka, Natalia (2020-03-23). "Radio Sources Associated with Optical Galaxies and Having Unresolved or Extended Morphologies (ROGUE). I. A Catalog of SDSS Galaxies with FIRST Core Identifications". The Astrophysical Journal Supplement Series. 247 (2): 53. arXiv:1912.09959. Bibcode:2020ApJS..247...53K. doi:10.3847/1538-4365/ab63d3. ISSN 0067-0049.
  4. ↑ Wen, Z. L.; Han, J. L.; Liu, F. S. (2012-03-30). "A Catalog of 132,684 Clusters of Galaxies Identified from Sloan Digital Sky Survey III". The Astrophysical Journal Supplement Series. 199 (2): 34. arXiv:1202.6424. Bibcode:2012ApJS..199...34W. doi:10.1088/0067-0049/199/2/34. ISSN 0067-0049.
  5. 1 2 Lin, Yen-Ting; Huang, Hung-Jin; Chen, Yen-Chi (2018-04-10). "An Analysis Framework for Understanding the Origin of Nuclear Activity in Low-power Radio Galaxies". The Astronomical Journal. 155 (5): 188. arXiv:1803.02482. Bibcode:2018AJ....155..188L. doi:10.3847/1538-3881/aab5b4. ISSN 0004-6256.
  6. ↑ Zarattini, S.; Barrena, R.; Girardi, M.; Castro-Rodriguez, N.; Boschin, W.; Aguerri, J. a. L.; Méndez-Abreu, J.; Sánchez-Janssen, R.; Catalán-Torrecilla, C.; Corsini, E. M.; Burgo, C. del; D’Onghia, E.; Herrera-Ruiz, N.; Iglesias-Páramo, J.; Bailon, E. Jimenez (2014-05-01). "Fossil group origins - IV. Characterization of the sample and observational properties of fossil systems" (PDF). Astronomy & Astrophysics. 565: A116. arXiv:1403.0588. Bibcode:2014A&A...565A.116Z. doi:10.1051/0004-6361/201323351. ISSN 0004-6361.
  7. ↑ Méndez-Abreu, J.; Aguerri, J. a. L.; Barrena, R.; Sánchez-Janssen, R.; Boschin, W.; Castro-Rodriguez, N.; Corsini, E. M.; Burgo, C. del; D’Onghia, E.; Girardi, M.; Iglesias-Páramo, J.; Napolitano, N.; Vilchez, J. M.; Zarattini, S. (2012-01-01). "Fossil group origins - II. Unveiling the formation of the brightest group galaxies through their scaling relations" (PDF). Astronomy & Astrophysics. 537: A25. arXiv:1110.0465. Bibcode:2012A&A...537A..25M. doi:10.1051/0004-6361/201117755. ISSN 0004-6361.
  8. ↑ Hess, Kelley M.; Wilcots, Eric M.; Hartwick, Victoria L. (2012-07-06). "FRESH ACTIVITY IN OLD SYSTEMS: RADIO AGNs IN FOSSIL GROUPS OF GALAXIES". The Astronomical Journal. 144 (2): 48. arXiv:1206.2679. Bibcode:2012AJ....144...48H. doi:10.1088/0004-6256/144/2/48. ISSN 0004-6256.
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