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  A wide and deep exploration of radio galaxies with Subaru HSC (WERGS). IV. Rapidly growing (super)massive black holes in extremely radio-loud galaxies

Ichikawa, K., Yamashita, T., Toba, Y., Nagao, T., Inayoshi, K., Charisi, M., et al. (2021). A wide and deep exploration of radio galaxies with Subaru HSC (WERGS). IV. Rapidly growing (super)massive black holes in extremely radio-loud galaxies. The Astrophysical Journal, 921(1): 51. doi:10.3847/1538-4357/ac1b26.

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Ichikawa, Kohei1, Author              
Yamashita, Takuji, Author
Toba, Yoshiki, Author
Nagao, Tohru, Author
Inayoshi, Kohei, Author
Charisi, Maria, Author
He, Wanqiu, Author
Wagner, Alexander Y., Author
Akiyama, Masayuki, Author
Vijarnwannaluk, Bovornpratch, Author
Chen, Xiaoyang, Author
Kajisawa, Masaru, Author
Kawamuro, Taiki, Author
Lee, Chien-Hsiu, Author
Matsuoka, Yoshiki, Author
Schramm, Malte, Author
Suh, Hyewon, Author
Tanaka, Masayuki, Author
Uchiyama, Hisakazu, Author
Ueda, Yoshihiro, Author
Pflugradt, Janek, AuthorFukuchi, Hikaru, Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We present the optical and infrared properties of 39 extremely radio-loud galaxies discovered by cross-matching the Subaru/Hyper Suprime-Cam (HSC) deep optical imaging survey and VLA/FIRST 1.4 GHz radio survey. The recent Subaru/HSC strategic survey revealed optically-faint radio galaxies (RG) down to gAB∼26, opening a new parameter space of extremely radio-loud galaxies (ERGs) with radio-loudness parameter of logRrest=log(f1.4GHz,rest/fg,rest)>4. Because of their optical faintness and small number density of ∼1 deg−2, such ERGs were difficult to find in the previous wide but shallow, or deep but small area optical surveys. ERGs show intriguing properties that are different from the conventional RGs: (1) most ERGs reside above or on the star-forming main-sequence, and some of them might be low-mass galaxies with log(M/M)<10. (2) ERGs exhibit a high specific black hole accretion rate, reaching the order of the Eddington limit. The intrinsic radio-loudness (Rint), defined by the ratio of jet power over bolometric radiation luminosity, is one order of magnitude higher than that of radio quasars. This suggests that ERGs harbor a unique type of active galactic nuclei (AGN) that show both powerful radiations and jets. Therefore, ERGs are prominent candidates of very rapidly growing black holes reaching Eddington-limited accretion just before the onset of intensive AGN feedback.

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 Dates: 2021-10-29
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ac1b26
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 921 (1) Sequence Number: 51 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3