Astronomy:Bean galaxy

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Bean Galaxy
DESI Legacy Surveys DR9 photo of the Bean Galaxy.
Observation data (J2000 epoch)
ConstellationDraco
Right ascension17h 15m 30.04s
Declination+64° 39' 51.61"
Redshift0.07898
Helio radial velocity22745
Distance1.089 bly (334 mpc)
Group or clusterSDSS-C4 3089
Characteristics
TypecD
Mass1.349×1012 M☉
Size319,000 ly (97,800 pc)
Other designations
7C 1715+6442, LEDA 59953, PGC 59953, WN B1715+6442

The Bean Galaxy, also known as 7C 1715+6442 is a supergiant elliptical galaxy, active galaxy, radio galaxy, and brightest cluster galaxy in the constellation of Draco.[1][2][3] The galaxy is 1.09 billion light years (or 334,000,000 parsecs) away at a spectroscopic redshift of z = 0.07898.[1][2] The galaxy has an apparent K magnitude of 11.568.[1] The Bean Galaxy is the brightest cluster galaxy of SDSS-C4 3089, and this galaxy cluster contains a total of 17 galaxies.[4] The galaxy was discovered in 1980 by the Westerbork Radio Telescope in the 14th list of radio sources.[5]

Characteristics

The Bean Galaxy is a massive, large supergiant elliptical galaxy in the galaxy cluster, SDSS-C4 3089.[1][2] The galaxy has a total diameter of 319,000 light years (or 97,800 parsecs) across, or roughly three times larger than the Milky Way.[2] The size was estimated using the 2MASS K-band total mag angular diameter of approximately one arcmin (or 60.4 arcsecs), and a redshift-independent distance of 1.09 billion light years (or 334,000,000 parsecs) away.[2]

The Bean Galaxy is thought to be exceptionally massive, having a stellar mass of 1.35 trillion M☉ (or 1012.13).[6] The stellar population of the galaxy is predicted to be old, with an average age of 6.75 billion years old (or 109.829).[7] The stellar population mainly consists of metal-poor red giant branch, and asymptotic giant branch stars.[7] The galaxy has a star-formation rate of 0.235 M☉ per year, typical for gas-poor elliptical galaxies.[8]

The galactic center of the Bean Galaxy has an active galactic nucleus (also referred to as an AGN), which is small region in the galactic center of a galaxy that is very luminous and energetic.[2] The active galactic nucleus is powered by a large supermassive black hole (also known as an SMBH) with a mass of 2.207 billion M☉ estimated using velocity dispersion.[9]

The Bean Galaxy is classified as a giant radio galaxy (also called as an GRG), i. e. a radio galaxy with radio lobes larger than 2.2 million light years (or 700,000 parsecs) across.[9] It was first discovered in 1980 that the Bean Galaxy was a radio galaxy.[5] The radio emissions stretch roughly 3 million light years (or 926,000 parsecs) across, based on an angular diameter of 10 arcmin.[9] These radio lobes are created by the galaxy's massive central black hole.[9] This giant radio galaxy is unusual because it is located in a galaxy cluster, which is rare for giant radio galaxies,[9] and it is similar to other radio galaxies such as Inkathazo in both extent and location.[10]

X-ray source

One X-ray source has been discovered in the Bean Galaxy: CXOX J171530.1+643950, which is classified as a radio X-ray source, and was discovered in 2024 in a survey of 3.1 million X-ray sources.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 "SIMBAD Results for Bean Galaxy". https://simbad.u-strasbg.fr/simbad/sim-id?Ident=Bean+Galaxy&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "NED Results for Bean Galaxy". https://ned.ipac.caltech.edu/byname?objname=LEDA+59953&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  3. ↑ Zhao, Dongyao (2015). "The link between morphology and structure of brightest cluster galaxies: automatic identification of cDs". Monthly Notices of the Royal Astronomical Society 448 (3): 2530. doi:10.1093/mnras/stv190. Bibcode: 2015MNRAS.448.2530Z. 
  4. ↑ "SIMBAD Results for SDSS-C4 3089". https://simbad.cds.unistra.fr/simbad/sim-id?Ident=%405198673&Name=SDSS-C4%203089&submit=submit. 
  5. ↑ 5.0 5.1 Harris, D. E. (1980). "Westerbork synthesis observations of 8 clusters of galaxies which contain tailed radio galaxies.". Astronomy and Astrophysics Supplement Series 39: 215. Bibcode: 1980A&AS...39..215H. https://ui.adsabs.harvard.edu/abs/1980A%26AS...39..215H/abstract. Retrieved 2026-01-10. 
  6. ↑ Mamon, Gary (2020). "The frequency of very young galaxies in the local Universe - II. The view from SDSS spectra". Monthly Notices of the Royal Astronomical Society 492 (2): 1791. doi:10.1093/mnras/stz3556. Bibcode: 2020MNRAS.492.1791M. 
  7. ↑ 7.0 7.1 Mattolini, D. (2025). "Re-assessing the stellar population scaling relations of the galaxies in the Local Universe". Astronomy & Astrophysics 703: A5. doi:10.1051/0004-6361/202554972. Bibcode: 2025A&A...703A...5M. https://ui.adsabs.harvard.edu/abs/2025A%26A...703A...5M/abstract. Retrieved 2026-01-10. 
  8. ↑ Demers, Melanie (2019). "Smaller stellar disc scale lengths in rich environments". Monthly Notices of the Royal Astronomical Society 489 (2): 2216. doi:10.1093/mnras/stz2305. Bibcode: 2019MNRAS.489.2216D. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 Oei, Martijn (2023). "Measuring the giant radio galaxy length distribution with the LoTSS". Astronomy & Astrophysics 672: A163. doi:10.1051/0004-6361/202243572. Bibcode: 2023A&A...672A.163O. https://ui.adsabs.harvard.edu/abs/2023A%26A...672A.163O/abstrac. Retrieved 2026-01-10. 
  10. ↑ Charlton, K. K. L. (2025). "A spatially resolved spectral analysis of giant radio galaxies with MeerKAT". Monthly Notices of the Royal Astronomical Society 537 (1): 272. doi:10.1093/mnras/stae2543. Bibcode: 2025MNRAS.537..272C. 
  11. ↑ Flesch, Eric (2024). "The Millions of Optical-Radio/X-ray Associations (MORX) Catalogue, v2". The Open Journal of Astrophysics 7: 6. doi:10.21105/astro.2308.01507. Bibcode: 2024OJAp....7E...6F. 




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