The cosmic growth of the active black hole population at 1 < z < 2 in zCOSMOS, VVDS and SDSS

A. Schulze, A. Bongiorno, I. Gavignaud, M. Schramm, J. Silverman, A. Merloni, G. Zamorani, M. Hirschmann, V. Mainieri, L. Wisotzki, F. Shankar, F. Fiore, A. M. Koekemoer, G. Temporin

Resultado de la investigación: Article

31 Citas (Scopus)

Resumen

We present a census of the active black hole population at 1 < z < 2, by constructing the bivariate distribution function of black hole mass and Eddington ratio, employing a maximum likelihood fitting technique. The study of the active black hole mass function (BHMF) and the Eddington ratio distribution function (ERDF) allows us to clearly disentangle the active galactic nuclei (AGN) downsizing phenomenon, present in the AGN luminosity function, into its physical processes of black hole mass downsizing and accretion rate evolution. We are utilizing type-1 AGN samples from three optical surveys (VVDS, zCOSMOS and SDSS), that cover a wide range of 3 dex in luminosity over our redshift interval of interest. We investigate the cosmic evolution of the AGN population as a function of AGN luminosity, black hole mass and accretion rate. Compared to z = 0, we find a distinct change in the shape of the BHMF and the ERDF, consistent with downsizing in black hole mass. The active fraction or duty cycle of type-1 AGN at z ~ 1.5 is almost flat as a function of black hole mass, while it shows a strong decrease with increasing mass at z = 0. We are witnessing a phase of intense black hole growth, which is largely driven by the onset of AGN activity in massive SMBHs (supermassive black holes) towards z = 2. We finally compare our results to numerical simulations and semiempirical models and while we find reasonable agreement over certain parameter ranges, we highlight the need to refine these models in order to match our observations.

Idioma originalEnglish
Páginas (desde-hasta)2085-2111
Número de páginas27
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen447
N.º3
DOI
EstadoPublished - 2015

Huella dactilar

active galactic nuclei
distribution functions
luminosity
accretion
census
mass ratios
intervals
cycles
simulation
distribution
rate

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Schulze, A. ; Bongiorno, A. ; Gavignaud, I. ; Schramm, M. ; Silverman, J. ; Merloni, A. ; Zamorani, G. ; Hirschmann, M. ; Mainieri, V. ; Wisotzki, L. ; Shankar, F. ; Fiore, F. ; Koekemoer, A. M. ; Temporin, G. / The cosmic growth of the active black hole population at 1 < z < 2 in zCOSMOS, VVDS and SDSS. En: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 447, N.º 3. pp. 2085-2111.
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title = "The cosmic growth of the active black hole population at 1 < z < 2 in zCOSMOS, VVDS and SDSS",
abstract = "We present a census of the active black hole population at 1 < z < 2, by constructing the bivariate distribution function of black hole mass and Eddington ratio, employing a maximum likelihood fitting technique. The study of the active black hole mass function (BHMF) and the Eddington ratio distribution function (ERDF) allows us to clearly disentangle the active galactic nuclei (AGN) downsizing phenomenon, present in the AGN luminosity function, into its physical processes of black hole mass downsizing and accretion rate evolution. We are utilizing type-1 AGN samples from three optical surveys (VVDS, zCOSMOS and SDSS), that cover a wide range of 3 dex in luminosity over our redshift interval of interest. We investigate the cosmic evolution of the AGN population as a function of AGN luminosity, black hole mass and accretion rate. Compared to z = 0, we find a distinct change in the shape of the BHMF and the ERDF, consistent with downsizing in black hole mass. The active fraction or duty cycle of type-1 AGN at z ~ 1.5 is almost flat as a function of black hole mass, while it shows a strong decrease with increasing mass at z = 0. We are witnessing a phase of intense black hole growth, which is largely driven by the onset of AGN activity in massive SMBHs (supermassive black holes) towards z = 2. We finally compare our results to numerical simulations and semiempirical models and while we find reasonable agreement over certain parameter ranges, we highlight the need to refine these models in order to match our observations.",
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author = "A. Schulze and A. Bongiorno and I. Gavignaud and M. Schramm and J. Silverman and A. Merloni and G. Zamorani and M. Hirschmann and V. Mainieri and L. Wisotzki and F. Shankar and F. Fiore and Koekemoer, {A. M.} and G. Temporin",
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Schulze, A, Bongiorno, A, Gavignaud, I, Schramm, M, Silverman, J, Merloni, A, Zamorani, G, Hirschmann, M, Mainieri, V, Wisotzki, L, Shankar, F, Fiore, F, Koekemoer, AM & Temporin, G 2015, 'The cosmic growth of the active black hole population at 1 < z < 2 in zCOSMOS, VVDS and SDSS', Monthly Notices of the Royal Astronomical Society, vol. 447, n.º 3, pp. 2085-2111. https://doi.org/10.1093/mnras/stu2549

The cosmic growth of the active black hole population at 1 < z < 2 in zCOSMOS, VVDS and SDSS. / Schulze, A.; Bongiorno, A.; Gavignaud, I.; Schramm, M.; Silverman, J.; Merloni, A.; Zamorani, G.; Hirschmann, M.; Mainieri, V.; Wisotzki, L.; Shankar, F.; Fiore, F.; Koekemoer, A. M.; Temporin, G.

En: Monthly Notices of the Royal Astronomical Society, Vol. 447, N.º 3, 2015, p. 2085-2111.

Resultado de la investigación: Article

TY - JOUR

T1 - The cosmic growth of the active black hole population at 1 < z < 2 in zCOSMOS, VVDS and SDSS

AU - Schulze, A.

AU - Bongiorno, A.

AU - Gavignaud, I.

AU - Schramm, M.

AU - Silverman, J.

AU - Merloni, A.

AU - Zamorani, G.

AU - Hirschmann, M.

AU - Mainieri, V.

AU - Wisotzki, L.

AU - Shankar, F.

AU - Fiore, F.

AU - Koekemoer, A. M.

AU - Temporin, G.

PY - 2015

Y1 - 2015

N2 - We present a census of the active black hole population at 1 < z < 2, by constructing the bivariate distribution function of black hole mass and Eddington ratio, employing a maximum likelihood fitting technique. The study of the active black hole mass function (BHMF) and the Eddington ratio distribution function (ERDF) allows us to clearly disentangle the active galactic nuclei (AGN) downsizing phenomenon, present in the AGN luminosity function, into its physical processes of black hole mass downsizing and accretion rate evolution. We are utilizing type-1 AGN samples from three optical surveys (VVDS, zCOSMOS and SDSS), that cover a wide range of 3 dex in luminosity over our redshift interval of interest. We investigate the cosmic evolution of the AGN population as a function of AGN luminosity, black hole mass and accretion rate. Compared to z = 0, we find a distinct change in the shape of the BHMF and the ERDF, consistent with downsizing in black hole mass. The active fraction or duty cycle of type-1 AGN at z ~ 1.5 is almost flat as a function of black hole mass, while it shows a strong decrease with increasing mass at z = 0. We are witnessing a phase of intense black hole growth, which is largely driven by the onset of AGN activity in massive SMBHs (supermassive black holes) towards z = 2. We finally compare our results to numerical simulations and semiempirical models and while we find reasonable agreement over certain parameter ranges, we highlight the need to refine these models in order to match our observations.

AB - We present a census of the active black hole population at 1 < z < 2, by constructing the bivariate distribution function of black hole mass and Eddington ratio, employing a maximum likelihood fitting technique. The study of the active black hole mass function (BHMF) and the Eddington ratio distribution function (ERDF) allows us to clearly disentangle the active galactic nuclei (AGN) downsizing phenomenon, present in the AGN luminosity function, into its physical processes of black hole mass downsizing and accretion rate evolution. We are utilizing type-1 AGN samples from three optical surveys (VVDS, zCOSMOS and SDSS), that cover a wide range of 3 dex in luminosity over our redshift interval of interest. We investigate the cosmic evolution of the AGN population as a function of AGN luminosity, black hole mass and accretion rate. Compared to z = 0, we find a distinct change in the shape of the BHMF and the ERDF, consistent with downsizing in black hole mass. The active fraction or duty cycle of type-1 AGN at z ~ 1.5 is almost flat as a function of black hole mass, while it shows a strong decrease with increasing mass at z = 0. We are witnessing a phase of intense black hole growth, which is largely driven by the onset of AGN activity in massive SMBHs (supermassive black holes) towards z = 2. We finally compare our results to numerical simulations and semiempirical models and while we find reasonable agreement over certain parameter ranges, we highlight the need to refine these models in order to match our observations.

KW - Galaxies: active

KW - Galaxies: nuclei

KW - Quasars: general

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U2 - 10.1093/mnras/stu2549

DO - 10.1093/mnras/stu2549

M3 - Article

VL - 447

SP - 2085

EP - 2111

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -