Arp 187

Arp 187 is a radio galaxy and merger remnant located in the constellation Eridanus. It is an interacting galaxy pair (MCG-02-13-040).[2] It is included in the Atlas of Peculiar Galaxies in the category galaxies with narrow filaments.

Arp 187
Arp 187 by PanSTARRS
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension5h 03m 53s [1]
Declination−10° 14′ 51″ [1]
Redshift12095 ± 45 km/s [1]
Apparent magnitude (V)15.3 [1]
Characteristics
TypeRadio Galaxy [1]
Apparent size (V)0.8 x 0.6 [1]
Other designations
PGC 16691 [1]

The galaxy has two prominent radio lobes, however the emission of its AGN in X-ray is low, and so is the thermal output of the AGN torus as observed in infrared, suggesting that it has been quenched. The detection of a narrow line region (with dimensions up to 10 kpc) with still active emission mean that the AGN was still active up to at least 104-5 years ago. In the nucleus of Arp 187 is predicted to lie a supermassive black hole (SMBH) with estimated mass around 6.7 × 108 M☉.[3] Further observations of such a SMBH with a quenched AGN were published in 2019.[4][5][6]

References
  1. "NASA/IPAC Extragalactic Database". Results for Arp 187. Retrieved 2006-10-26.
  2. "Simbad". Retrieved 2010-01-06.
  3. Ichikawa, Kohei; Ueda, Junko; Shidatsu, Megumi; Kawamuro, Taiki; Matsuoka, Kenta (1 February 2016). "Signs of active galactic nucleus quenching in a merger remnant with radio jets". Publications of the Astronomical Society of Japan. 68 (1): 9. arXiv:1510.06037. doi:10.1093/pasj/psv112.
  4. "Active Galactic Nucleus caught in the act of "dying" 〜light echo delivers the information before the death〜". Tohoku university. 1 April 2019.
  5. Ichikawa K, Ueda J, Bae H, et al. (9 January 2019). "Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within 104 yr". The Astrophysical Journal. 870 (2): 65. arXiv:1811.07447. Bibcode:2019ApJ...870...65I. doi:10.3847/1538-4357/aaf233. S2CID 119466692.
  6. "Discovery of a Dying Supermassive Black Hole Via a 3000-year-long Light Echo". Tohoku university. 4 June 2021.
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