Beaver galaxy

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Beaver galaxy
Image of Beaver galaxy.png
SDSS image of the Beaver galaxy
Observation data (J2000.0 epoch)
Constellation Draco
Right ascension 17h 13m 16.00s [1]
Declination +63° 47′ 37.56″ [1]
Redshift 0.082955
Heliocentric radial velocity 24,869 km/s ± 4 [1]
Distance 1,205.6 ± 84.4  Mly (369.65 ± 25.88  Mpc) [1]
Group or cluster Abell 2255
magnitude  (J)12.97 [1]
Characteristics
Type Radio galaxy [1]
Size~362,000  ly (110.9  kpc) (estimated) [1]
Other designations
14W 119, PGC 59867, 2MASX J17131603+6347378, 7C 1712+6352, 1712+638, ABELL 2255:[ZBO89] O4, [GMF2006] J1713.3+6347 [1]

The Beaver galaxy known as 7C 1712+6352 or 1712+638, is a radio galaxy located in the constellation of Draco. The redshift of the galaxy is (z) 0.082 [1] and it was first discovered by astronomers in 1980. It is also considered to be a member of Abell 2255 alongside the Goldfish galaxy, Original TRG and the Embryo galaxy. [2] [3]

Contents

Description

The Beaver galaxy is classified to be head-tail radio galaxy or alternatively, a narrow angle tail radio galaxy, positioned in the southern region away from the center of Abell 2255. [2] [4] [5] When observed, the source is found to be extended over an area of 400 kiloparsecs with two regions of polarized emission located by 10 arcseconds west and northwest from the peak of the northern radio region, in the position angle of 90°. [2] The tail feature of the Beaver galaxy has been described to have a long appearance and shown to drastically increase its length to around 1 megaparsec. It also exhibits signs of steepening of the spectral index indicating the electrons lost energy after being ejected from the host. The ages of the plasma of the tail end is estimated to be 2.2 x 108 years. [6] [7]

Radio imaging made by Very Large Array (VLA), showed the presence of two radio jets bending backwards from the radio core of the Beaver galaxy. [8] Evidence also found the inner regions of the jets displaying significant signs of polarization at 20 kiloparsecs from the core. However the eastern jet seems less polarized when imaged at 3.6 centimeters while the western jet is more polarized. The estimated fractional polarization of the eastern jet is 12% while the western jet has fractional polarization of 23%. [9] Further radio observations also found both of the jets are shown closer to each other along the tail position, before subsequently forming a corkscrew feature. Observations at low frequencies, found the tail feature as twisted and fading away upon reaching the cluster radio emission halo. [4]

References

  1. 1 2 3 4 5 6 7 8 9 "NED Search results for Beaver galaxy". NASA/IPAC Extragalactic Database. Retrieved 2026-02-15.
  2. 1 2 3 Harris, D. E.; Kapahi, V. K.; Ekers, R. D. (February 1980). "Westerbork synthesis observations of 8 clusters of galaxies which contain tailed radio galaxies". Astronomy and Astrophysics Supplement Series. 39: 215–233. ISSN   0365-0138.
  3. ↑ Burns, Jack O.; Roettiger, Kurt; Pinkney, Jason; Perley, Rick A.; Owen, Frazer N.; Voges, Wolfgang (June 1995). "Evidence for an On-going Cluster/Group Merger in Abell 2255". The Astrophysical Journal. 446: 583. doi:10.1086/175817. ISSN   0004-637X.
  4. 1 2 Rubeis, E. De; Bondi, M.; Botteon, A.; Weeren, R. J. van; Jong, J. M. G. H. J. de; Rudnick, L.; Brunetti, G.; Rajpurohit, K.; Gheller, C.; Röttgering, H. J. A. (2025-07-01). "Revealing the intricacies of radio galaxies and filaments in the merging galaxy cluster Abell 2255 - I. Insights from deep LOFAR-VLBI sub-arcsecond resolution images". Astronomy & Astrophysics. 699: A229. doi:10.1051/0004-6361/202555268. ISSN   0004-6361.
  5. ↑ Govoni, F.; Murgia, M.; Feretti, L.; Giovannini, G.; Dolag, K.; Taylor, G. B. (2006-12-01). "The intracluster magnetic field power spectrum in Abell 2255" (PDF). Astronomy & Astrophysics. 460 (2): 425–438. doi:10.1051/0004-6361:20065964. ISSN   0004-6361.
  6. ↑ Pizzo, R. F.; Bruyn, A. G. de; Bernardi, G.; Brentjens, M. A. (2011-01-01). "Deep multi-frequency rotation measure tomography of the galaxy cluster A2255" (PDF). Astronomy & Astrophysics. 525: A104. doi:10.1051/0004-6361/201014158. ISSN   0004-6361.
  7. ↑ Pizzo, R. F.; Bruyn, A. G. de (2009-11-01). "Radio spectral study of the cluster of galaxies Abell 2255". Astronomy & Astrophysics. 507 (2): 639–659. doi:10.1051/0004-6361/200912465. ISSN   0004-6361.
  8. ↑ O'Dea, C. P.; Owen, F. N. (June 1985). "VLA observations of 57 sources in clusters of galaxies". The Astronomical Journal. 90: 927–953. doi:10.1086/113801. ISSN   0004-6256.
  9. ↑ Govoni, F.; Murgia, M.; Feretti, L.; Giovannini, G.; Dolag, K.; Taylor, G. B. (2006-12-01). "The intracluster magnetic field power spectrum in Abell 2255" (PDF). Astronomy & Astrophysics. 460 (2): 425–438. doi:10.1051/0004-6361:20065964. ISSN   0004-6361.
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