Evidence for two modes of black hole accretion in massive galaxies at z∼2 | Zendy

C. Rangel | Zendy; K. Nandra | Zendy; Guillermo Barro | Zendy; Murray Brightman | Zendy; Li-Ting Hsu | Zendy; M. Salvato | Zendy; Anton M. Koekemoer | Zendy; M. Brusa | Zendy; E. S. Laird | Zendy; Jonathan R. Trump | Zendy; Darren Croton | Zendy; David C. Koo | Zendy; D. Kocevski | Zendy; J. L. Donley | Zendy; Nimish P. Hathi | Zendy; Michael Peth | Zendy; S. M. Faber | Zendy; Mark Mozena | Zendy; Norman A. Grogin | Zendy; Henry C. Ferguson | Zendy; K. Lai | Zendy

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Evidence for two modes of black hole accretion in massive galaxies at z∼2

Author(s) -

C. Rangel,

K. Nandra,

Guillermo Barro,

Murray Brightman,

Li-Ting Hsu,

M. Salvato,

Anton M. Koekemoer,

M. Brusa,

E. S. Laird,

Jonathan R. Trump,

Darren Croton,

David C. Koo,

D. Kocevski,

J. L. Donley,

Nimish P. Hathi,

Michael Peth,

S. M. Faber,

Mark Mozena,

Norman A. Grogin,

Henry C. Ferguson,

K. Lai

Publication year - 2014

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/stu517

Subject(s) - physics , astrophysics , active galactic nucleus , chandra deep field south , galaxy , luminous infrared galaxy , astronomy , accretion (finance) , star formation , cosmic time , galaxy formation and evolution , hubble ultra deep field , elliptical galaxy , redshift , hubble deep field

We investigate the relationship between active galactic nucleus (AGN) activity and host galaxy properties using a sample of massive galaxies at z ∼ 2 in the Chandra Deep Field-South (CDFS). A sample of 268 galaxies with M* > 1010.5M⊙ at 1.4 < z < 3 are selected from Hubble Space Telescope wide field camera 3 (WFC3) H-band observations in CDFS taken as part of the cosmic assembly near-infrared deep extragalactic legacy survey (CANDELS) survey. We find that a large fraction (22.0 ± 2.5 per cent) are detected in the 4 Ms Chandra/Advanced CCD Image Spectrometer observations in the field, implying a high AGN content in these massive galaxies. To investigate further the relationship between these AGN and their hosts, we create four subsamples, based on their star formation rates (star-forming versus quiescent) and galaxy size (compact versus extended), following Barro et al. and perform X-ray spectral fitting. We find a clear effect whereby the AGN in compact galaxies - be they star forming or quiescent - show significantly higher luminosities and levels of obscuration than the AGN in extended galaxies. These results provide clear evidence for two modes of black hole growth in massive galaxies at high redshift. The dominant growth mode is a luminous, obscured phase which occurs overwhelmingly in compact galaxies while another lower luminosity, unobscured phase is predominantly seen in extended galaxies. Both modes could produce AGN feedback, with violent transformative feedback in the former and a gentler 'maintenance mode' produced by the latter

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