Arp 187 Explained
| Arp 187 |
| Epoch: | J2000 |
| Constellation Name: | Eridanus |
| Type: | Radio Galaxy [1] |
| Appmag V: | 15.3 |
| Size V: | 0.8 x 0.6 |
| Z: | 12095 ± 45 km/s |
| Names: | 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 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 .[3] Further observations of such a SMBH with a quenched AGN were published in 2019.[4] [5] [6]
External links
Notes and References
- Web site: NASA/IPAC Extragalactic Database . Results for Arp 187 . 2006-10-26 .
- Web site: Simbad . 2010-01-06.
- Ichikawa . Kohei . Ueda . Junko . Shidatsu . Megumi . Kawamuro . Taiki . Matsuoka . Kenta . Signs of active galactic nucleus quenching in a merger remnant with radio jets . Publications of the Astronomical Society of Japan . 1 February 2016 . 68 . 1 . 9 . 10.1093/pasj/psv112. 1510.06037 .
- Web site: Active Galactic Nucleus caught in the act of "dying" 〜light echo delivers the information before the death〜. 1 April 2019 . Tohoku university.
- 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 . 10.3847/1538-4357/aaf233. 1811.07447. 2019ApJ...870...65I . 119466692 . free .
- Web site: Discovery of a Dying Supermassive Black Hole Via a 3000-year-long Light Echo. 4 June 2021 . Tohoku university.
