Arp 187

Arp 187
Arp 187
	Arp 187 by PanSTARRS
Observation data (J2000 epoch)
Constellation	Eridanus
Right ascension	5h 03m 53s
Declination	−10° 14′ 51″
Redshift	12095 ± 45 km/s
Apparent magnitude (V)	15.3
Characteristics
Type	Radio Galaxy
Apparent size (V)	0.8 x 0.6
Other designations
	PGC 16691

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.

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 10^4-5 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[]

^ ^a ^b ^c ^d ^e ^f ^g "NASA/IPAC Extragalactic Database". Results for Arp 187. Retrieved 2006-10-26.
^ "Simbad". Retrieved 2010-01-06.
^ 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.
^ "Active Galactic Nucleus caught in the act of "dying" 〜light echo delivers the information before the death〜". Tohoku university. 1 April 2019.
^ 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. arXiv:1811.07447. doi:10.3847/1538-4357/aaf233.
^ "Discovery of a Dying Supermassive Black Hole Via a 3000-year-long Light Echo". Tohoku university. 4 June 2021.

External links[]

Arp 187 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Photo of Arp 187

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[ned-1] ^ ^a ^b ^c ^d ^e ^f ^g "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. arXiv:1811.07447. doi:10.3847/1538-4357/aaf233.

[6] "Discovery of a Dying Supermassive Black Hole Via a 3000-year-long Light Echo". Tohoku university. 4 June 2021.

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