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The coevolution of supermassive black holes and massive galaxies at high redshift

The coevolution of supermassive black holes and massive galaxies at high redshift
The coevolution of supermassive black holes and massive galaxies at high redshift
We exploit the recent, wide samples of far-infrared (FIR) selected galaxies followed up in X-rays and of X-ray/optically selected active galactic nuclei (AGNs) followed up in the FIR band, along with the classic data on AGNs and stellar luminosity functions at high redshift z gsim 1.5, to probe different stages in the coevolution of supermassive black holes (BHs) and host galaxies. The results of our analysis indicate the following scenario: (1) the star formation in the host galaxy proceeds within a heavily dust-enshrouded medium at an almost constant rate over a timescale lesssim 0.5-1 Gyr and then abruptly declines due to quasar feedback, over the same timescale; (2) part of the interstellar medium loses angular momentum, reaches the circum-nuclear regions at a rate proportional to the star formation, and is temporarily stored in a massive reservoir/proto-torus wherefrom it can be promptly accreted; (3) the BH grows by accretion in a self-regulated regime with radiative power that can slightly exceed the Eddington limit L/L Edd lesssim 4, particularly at the highest redshifts; (4) for massive BHs, the ensuing energy feedback at its maximum exceeds the stellar one and removes the interstellar gas, thus stopping the star formation and the fueling of the reservoir; (5) afterward, if the latter has retained enough gas, a phase of supply-limited accretion follows, exponentially declining with a timescale of about two e-folding times. We also discuss how the detailed properties and the specific evolution of the reservoir can be investigated via coordinated, high-resolution observations of star-forming, strongly lensed galaxies in the (sub-)mm band with ALMA and in the X-ray band with Chandra and the next-generation X-ray instruments.
0004-637X
Lapi, A.
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Raimundo, S.
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Aversa, R.
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Cai, Z.-Y.
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Negrello, M.
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Celotti, A.
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De Zotti, G.
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Danese, L.
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Lapi, A.
7e92f844-db1f-4d93-b7cb-d81b8a4648b1
Raimundo, S.
e409d9d3-17e8-4049-ad29-43ada60b24e2
Aversa, R.
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Cai, Z.-Y.
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Negrello, M.
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Celotti, A.
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De Zotti, G.
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Danese, L.
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Lapi, A., Raimundo, S., Aversa, R., Cai, Z.-Y., Negrello, M., Celotti, A., De Zotti, G. and Danese, L. (2014) The coevolution of supermassive black holes and massive galaxies at high redshift. The Astrophysical Journal, 782 (2), [69]. (doi:10.1088/0004-637X/782/2/69).

Record type: Article

Abstract

We exploit the recent, wide samples of far-infrared (FIR) selected galaxies followed up in X-rays and of X-ray/optically selected active galactic nuclei (AGNs) followed up in the FIR band, along with the classic data on AGNs and stellar luminosity functions at high redshift z gsim 1.5, to probe different stages in the coevolution of supermassive black holes (BHs) and host galaxies. The results of our analysis indicate the following scenario: (1) the star formation in the host galaxy proceeds within a heavily dust-enshrouded medium at an almost constant rate over a timescale lesssim 0.5-1 Gyr and then abruptly declines due to quasar feedback, over the same timescale; (2) part of the interstellar medium loses angular momentum, reaches the circum-nuclear regions at a rate proportional to the star formation, and is temporarily stored in a massive reservoir/proto-torus wherefrom it can be promptly accreted; (3) the BH grows by accretion in a self-regulated regime with radiative power that can slightly exceed the Eddington limit L/L Edd lesssim 4, particularly at the highest redshifts; (4) for massive BHs, the ensuing energy feedback at its maximum exceeds the stellar one and removes the interstellar gas, thus stopping the star formation and the fueling of the reservoir; (5) afterward, if the latter has retained enough gas, a phase of supply-limited accretion follows, exponentially declining with a timescale of about two e-folding times. We also discuss how the detailed properties and the specific evolution of the reservoir can be investigated via coordinated, high-resolution observations of star-forming, strongly lensed galaxies in the (sub-)mm band with ALMA and in the X-ray band with Chandra and the next-generation X-ray instruments.

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The Coevolution of Supermassive Black Holes and Massive Galaxies at High Redshift - Accepted Manuscript
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Accepted/In Press date: 13 December 2013
e-pub ahead of print date: 29 January 2014
Published date: 20 February 2014
Additional Information: ARXIV IS AM

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Local EPrints ID: 443916
URI: http://eprints.soton.ac.uk/id/eprint/443916
ISSN: 0004-637X
PURE UUID: 0dfb7526-0a15-4484-80c3-e2dfb48c7a6d

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Date deposited: 16 Sep 2020 16:39
Last modified: 09 Feb 2021 17:31

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Contributors

Author: A. Lapi
Author: S. Raimundo
Author: R. Aversa
Author: Z.-Y. Cai
Author: M. Negrello
Author: A. Celotti
Author: G. De Zotti
Author: L. Danese

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