BZB J1717+2931

BZB J1717+2931
SDSS image of BZB J1717+2931
Observation data (J2000.0 epoch)
ConstellationHercules
Right ascension17h 17m 06.89s[1]
Declination+29° 31′ 21.05″[1]
Redshift0.277974[1]
Heliocentric radial velocity83,335 ± 7 km/s[1]
Distance4,023.7 ± 281.2 Mly (1,233.67 ± 86.21 Mpc)[1]
Group or clusterRBS 1634
magnitude (J)15.30[1]
Characteristics
TypeBLLAC[1]
Size~638,000 ly (195.6 kpc) (estimated)[1]
Other designations
2MASX J17170691+2931216, [MGL2009] 2226, LEDA 1869000, NVSS J171706+293117, SDSS J171706.89+293121.0, WHL J171706.9+293121 BCG[1]

BZB J1717+2931 is a BL Lacertae object located in the constellation of Hercules. The redshift of the galaxy is (z) 0.277[1] and it is a member of the galaxy cluster, RBS 1634, residing as the brightest cluster galaxy (BCG).[2][3]

BZB J1717+2931 is an active galactic nucleus (AGN) candidate. The optical spectrum of the galaxy displays strong signatures of emission lines, with the galaxy itself, displaying a color offset of -0.49 g – r magnitude.[3] Evidence also found it is a galaxy-dominated (G type) BL Lacertae object with the u – r color index estimated to be 3.1 magnitude while the J – K color index is found to be 1.43 magnitude.[4] The object is also a central elliptical galaxy with an estimated half viral radius of 1.003 arcmin.[5]

The galaxy is also a bright X-ray source, identified in 2000 by ROSAT Bright Source Catalogue and also by NRAO VLA Sky Survey.[6] A study also found the X-ray peak is shown coinciding with the galaxy's position with the X-ray emission being centered on it.[7] The associated X-ray component to the galaxy is found to have an extent parameter of 30 arcminutes and has X-ray luminosity of 6.92E+44 erg s-1.[5]

References

  1. 1 2 3 4 5 6 7 8 9 10 "NED Search results for BZB J1717+2931". NASA/IPAC Extragalactic Database. Retrieved 2026-05-27.
  2. ↑ Green, T. S.; Edge, A. C.; Ebeling, H.; Burgett, W. S.; Draper, P. W.; Kaiser, N.; Kudritzki, R.-P.; Magnier, E. A.; Metcalfe, N.; Wainscoat, R. J.; Waters, C. (2016-11-23). "Hiding in plain sight – recovering clusters of galaxies with the strongest AGN in their cores". Monthly Notices of the Royal Astronomical Society. 465 (4): 4872–4885. arXiv:1611.07996. doi:10.1093/mnras/stw3059. ISSN 0035-8711.
  3. 1 2 Green, T. S.; Edge, A. C.; Stott, J. P.; Ebeling, H.; Burgett, W. S.; Chambers, K. C.; Draper, P. W.; Metcalfe, N.; Kaiser, N.; Wainscoat, R. J.; Waters, C. (2016-06-07). "A multiwavelength photometric census of AGN and star formation activity in the brightest cluster galaxies of X-ray selected clusters". Monthly Notices of the Royal Astronomical Society. 461 (1): 560–577. arXiv:1606.01251. doi:10.1093/mnras/stw1338. ISSN 0035-8711.
  4. ↑ Massaro, Enrico; Nesci, Roberto; Piranomonte, Silvia (2012-04-12). "The colours of BL Lac objects: a new approach to their classification". Monthly Notices of the Royal Astronomical Society. 422 (3): 2322–2331. arXiv:1202.4614. Bibcode:2012MNRAS.422.2322M. doi:10.1111/j.1365-2966.2012.20782.x. ISSN 0035-8711.
  5. 1 2 Eigenthaler, P.; Zeilinger, W. W. (December 2009). "The properties of fossil groups of galaxies". Astronomische Nachrichten. 330 (9–10): 978–987. arXiv:0908.1700. Bibcode:2009AN....330..978E. doi:10.1002/asna.200911274.
  6. ↑ Bauer, Franz E.; Condon, J. J.; Thuan, Trinh X.; Broderick, J. J. (August 2000). "RBSC-NVSS Sample. I. Radio and Optical Identifications of a Complete Sample of 1556 Bright X-Ray Sources". The Astrophysical Journal Supplement Series. 129 (2): 547–562. arXiv:astro-ph/0003002. Bibcode:2000ApJS..129..547B. doi:10.1086/313425. ISSN 0067-0049.
  7. ↑ Böhringer, H.; Chon, G.; Ellis, R. S.; Barrena, R.; Laporte, N. (2022-08-01). "XMM-Newton study of six massive, X-ray luminous galaxy cluster systems in the redshift range z = 0.25–0.5". Astronomy & Astrophysics. 664: A57. arXiv:2205.06729. Bibcode:2022A&A...664A..57B. doi:10.1051/0004-6361/202243424. ISSN 0004-6361.
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