An absence of radio-loud active galactic nuclei in geometrically flat quiescent galaxies : implications for maintenance-mode feedback models

Autor: Rachel Bezanson, Yu-Yen Chang, Michael V. Maseda, Ivana Barišić, Po-Feng Wu, Huub Röttgering, Josha van Houdt, Glenn van de Ven, Eric F. Bell, Arjen van der Wel
Jazyk: angličtina
Rok vydání: 2019
Předmět:
statistics [galaxies]
Active galactic nucleus
010504 meteorology & atmospheric sciences
Stellar mass
media_common.quotation_subject
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
0103 physical sciences
Galaxy formation and evolution
Astrophysics::Solar and Stellar Astrophysics
fundamental parameters [galaxies]
star [galaxies]
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
media_common
Physics
Star formation
ORIGIN
COEVOLUTION
formation
LUMINOSITIES
Velocity dispersion
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
HOST GALAXIES
Physics and Astronomy
Space and Planetary Science
Sky
Astrophysics of Galaxies (astro-ph.GA)
active [galaxies]
structure [galaxies]
Halo
Astrophysics::Earth and Planetary Astrophysics
SKY
BLACK-HOLE MASS
Zdroj: ASTROPHYSICAL JOURNAL LETTERS
The Astrophysical Journal Letters
The Astrophysical Journal
The Astrophysical Journal Letters, 872(1), L12
ISSN: 2041-8205
2041-8213
0067-0049
0004-637X
1538-3881
0002-7537
Popis: Maintenance-mode feedback from low-accretion rate AGN, manifesting itself observationally through radio-loudness, is invoked in all cosmological galaxy formation models as a mechanism that prevents excessive star-formation in massive galaxies (M$_*$ $\gtrsim$ 3$\times$10$^{10}$ M$_{\odot}$). We demonstrate that at a fixed mass the incidence of radio-loud AGN (L $>$ 10$^{23}$ WHz$^{- 1}$) identified in the FIRST and NVSS radio surveys among a large sample of quiescent (non-star forming) galaxies selected from the SDSS is much higher in geometrically round galaxies than in geometrically flat, disk-like galaxies. As found previously, the RL AGN fraction increases steeply with stellar velocity dispersion $\sigma_*$ and stellar mass, but even at a fixed velocity dispersion of 200-250 kms$^{-1}$ this fraction increases from 0.3% for flat galaxies (projected axis ratio of q $$ 0.8). We rule out that this strong trend is due to projection effects in the measured velocity dispersion. The large fraction of radio-loud AGN in massive, round galaxies is consistent with the hypothesis that such AGN deposit energy into their hot gaseous halos, preventing cooling and star-formation. However, the absence of such AGN in disk-like quiescent galaxies -- most of which are not satellites in massive clusters, raises important questions: is maintenance-mode feedback a generally valid explanation for quiescence; and, if so, how does that feedback avoid manifesting at least occasionally as a radio-loud galaxy?
Comment: 7 pages, 5 figures, accepted for publication in ApJ Letters
Databáze: OpenAIRE
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