GOODS-Herschel: The far-infrared view of star formation in active galactic nucleus host galaxies since z ≈ 3

J. R. Mullaney, M. Pannella, E. Daddi, D. M. Alexander, D. Elbaz, R. C. Hickox, F. Bournaud, B. Altieri, H. Aussel, D. Coia, H. Dannerbauer, K. Dasyra, M. Dickinson, H. S. Hwang, J. Kartaltepe, R. Leiton, G. Magdis, B. Magnelli, P. Popesso, I. ValtchanovF. E. Bauer, W. N. Brandt, A. Del Moro, D. J. Hanish, R. J. Ivison, S. Juneau, B. Luo, D. Lutz, M. T. Sargent, D. Scott, Y. Q. Xue

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Abstract

We present a study of the infrared properties of X-ray selected, moderate-luminosity (i.e.LX= 1042-1044ergs-1) active galactic nuclei (AGNs) up toz≈ 3, in order to explore the links between star formation in galaxies and accretion on to their central black holes. We use 100 and 160μ mfluxes from GOODS-Herschel- the deepest survey yet undertaken by theHerscheltelescope - and show that in the vast majority of cases (i.e. >94percent) these fluxes are dominated by emission from the host galaxy. As such, these far-infrared bands provide an uncontaminated view of star formation in the AGN host galaxies. We find no evidence of any correlation between the X-ray and infrared luminosities of moderate AGNs at any redshift, suggesting that global star formation is decoupled from nuclear (i.e. AGN) activity in these galaxies. On the other hand, we confirm that the star formation rates of AGN hosts increase strongly with redshift, by a factor of 43+27- 18 fromz< 0.1 toz= 2-3 for AGNswith the same range of X-ray luminosities. This increase is entirely consistent with the factor of 25-50 increase in the specific star formation rates (SSFRs) of normal, star-forming (i.e. main-sequence) galaxies over the same redshift range. Indeed, the average SSFRs of AGN hosts are only marginally (i.e. ≈20percent) lower than those of main-sequence galaxies at all surveyed redshifts, with this small deficit being due to a fraction of AGNs residing in quiescent (i.e. low SSFR) galaxies. We estimate that 79 ± 10percent of moderate-luminosity AGNs are hosted in main-sequence galaxies, 15 ± 7percent in quiescent galaxies and <10percent in strongly starbursting galaxies. We derive the fractions of all main-sequence galaxies atz< 2 that are experiencing a period of moderate nuclear activity, noting that it is strongly dependent on galaxy stellar mass (Mstars), rising from just a fewpercent atMstars~ 1010 M to ≳20percent atMstars≥ 1011 M. Our results indicate that it is galaxy stellar mass that is most important in dictating whether a galaxy hosts a moderate-luminosity AGN. We argue that the majority of moderate nuclear activity is fuelled by internal mechanisms rather than violent mergers, which suggests that high-redshift disc instabilities could be an important AGN feeding mechanism.

Original languageEnglish (US)
Pages (from-to)95-115
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume419
Issue number1
DOIs
StatePublished - Jan 1 2012

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active galactic nuclei
star formation
galaxies
star formation rate
feeding mechanism
luminosity
merger
accretion
goods
stellar mass
rate
x rays

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Mullaney, J. R. ; Pannella, M. ; Daddi, E. ; Alexander, D. M. ; Elbaz, D. ; Hickox, R. C. ; Bournaud, F. ; Altieri, B. ; Aussel, H. ; Coia, D. ; Dannerbauer, H. ; Dasyra, K. ; Dickinson, M. ; Hwang, H. S. ; Kartaltepe, J. ; Leiton, R. ; Magdis, G. ; Magnelli, B. ; Popesso, P. ; Valtchanov, I. ; Bauer, F. E. ; Brandt, W. N. ; Del Moro, A. ; Hanish, D. J. ; Ivison, R. J. ; Juneau, S. ; Luo, B. ; Lutz, D. ; Sargent, M. T. ; Scott, D. ; Xue, Y. Q. / GOODS-Herschel : The far-infrared view of star formation in active galactic nucleus host galaxies since z ≈ 3. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 419, No. 1. pp. 95-115.
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abstract = "We present a study of the infrared properties of X-ray selected, moderate-luminosity (i.e.LX= 1042-1044ergs-1) active galactic nuclei (AGNs) up toz≈ 3, in order to explore the links between star formation in galaxies and accretion on to their central black holes. We use 100 and 160μ mfluxes from GOODS-Herschel- the deepest survey yet undertaken by theHerscheltelescope - and show that in the vast majority of cases (i.e. >94percent) these fluxes are dominated by emission from the host galaxy. As such, these far-infrared bands provide an uncontaminated view of star formation in the AGN host galaxies. We find no evidence of any correlation between the X-ray and infrared luminosities of moderate AGNs at any redshift, suggesting that global star formation is decoupled from nuclear (i.e. AGN) activity in these galaxies. On the other hand, we confirm that the star formation rates of AGN hosts increase strongly with redshift, by a factor of 43+27- 18 fromz< 0.1 toz= 2-3 for AGNswith the same range of X-ray luminosities. This increase is entirely consistent with the factor of 25-50 increase in the specific star formation rates (SSFRs) of normal, star-forming (i.e. main-sequence) galaxies over the same redshift range. Indeed, the average SSFRs of AGN hosts are only marginally (i.e. ≈20percent) lower than those of main-sequence galaxies at all surveyed redshifts, with this small deficit being due to a fraction of AGNs residing in quiescent (i.e. low SSFR) galaxies. We estimate that 79 ± 10percent of moderate-luminosity AGNs are hosted in main-sequence galaxies, 15 ± 7percent in quiescent galaxies and <10percent in strongly starbursting galaxies. We derive the fractions of all main-sequence galaxies atz< 2 that are experiencing a period of moderate nuclear activity, noting that it is strongly dependent on galaxy stellar mass (Mstars), rising from just a fewpercent atMstars~ 1010 M⊙ to ≳20percent atMstars≥ 1011 M⊙. Our results indicate that it is galaxy stellar mass that is most important in dictating whether a galaxy hosts a moderate-luminosity AGN. We argue that the majority of moderate nuclear activity is fuelled by internal mechanisms rather than violent mergers, which suggests that high-redshift disc instabilities could be an important AGN feeding mechanism.",
author = "Mullaney, {J. R.} and M. Pannella and E. Daddi and Alexander, {D. M.} and D. Elbaz and Hickox, {R. C.} and F. Bournaud and B. Altieri and H. Aussel and D. Coia and H. Dannerbauer and K. Dasyra and M. Dickinson and Hwang, {H. S.} and J. Kartaltepe and R. Leiton and G. Magdis and B. Magnelli and P. Popesso and I. Valtchanov and Bauer, {F. E.} and Brandt, {W. N.} and {Del Moro}, A. and Hanish, {D. J.} and Ivison, {R. J.} and S. Juneau and B. Luo and D. Lutz and Sargent, {M. T.} and D. Scott and Xue, {Y. Q.}",
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Mullaney, JR, Pannella, M, Daddi, E, Alexander, DM, Elbaz, D, Hickox, RC, Bournaud, F, Altieri, B, Aussel, H, Coia, D, Dannerbauer, H, Dasyra, K, Dickinson, M, Hwang, HS, Kartaltepe, J, Leiton, R, Magdis, G, Magnelli, B, Popesso, P, Valtchanov, I, Bauer, FE, Brandt, WN, Del Moro, A, Hanish, DJ, Ivison, RJ, Juneau, S, Luo, B, Lutz, D, Sargent, MT, Scott, D & Xue, YQ 2012, 'GOODS-Herschel: The far-infrared view of star formation in active galactic nucleus host galaxies since z ≈ 3', Monthly Notices of the Royal Astronomical Society, vol. 419, no. 1, pp. 95-115. https://doi.org/10.1111/j.1365-2966.2011.19675.x

GOODS-Herschel : The far-infrared view of star formation in active galactic nucleus host galaxies since z ≈ 3. / Mullaney, J. R.; Pannella, M.; Daddi, E.; Alexander, D. M.; Elbaz, D.; Hickox, R. C.; Bournaud, F.; Altieri, B.; Aussel, H.; Coia, D.; Dannerbauer, H.; Dasyra, K.; Dickinson, M.; Hwang, H. S.; Kartaltepe, J.; Leiton, R.; Magdis, G.; Magnelli, B.; Popesso, P.; Valtchanov, I.; Bauer, F. E.; Brandt, W. N.; Del Moro, A.; Hanish, D. J.; Ivison, R. J.; Juneau, S.; Luo, B.; Lutz, D.; Sargent, M. T.; Scott, D.; Xue, Y. Q.

In: Monthly Notices of the Royal Astronomical Society, Vol. 419, No. 1, 01.01.2012, p. 95-115.

Research output: Contribution to journalArticle

TY - JOUR

T1 - GOODS-Herschel

T2 - The far-infrared view of star formation in active galactic nucleus host galaxies since z ≈ 3

AU - Mullaney, J. R.

AU - Pannella, M.

AU - Daddi, E.

AU - Alexander, D. M.

AU - Elbaz, D.

AU - Hickox, R. C.

AU - Bournaud, F.

AU - Altieri, B.

AU - Aussel, H.

AU - Coia, D.

AU - Dannerbauer, H.

AU - Dasyra, K.

AU - Dickinson, M.

AU - Hwang, H. S.

AU - Kartaltepe, J.

AU - Leiton, R.

AU - Magdis, G.

AU - Magnelli, B.

AU - Popesso, P.

AU - Valtchanov, I.

AU - Bauer, F. E.

AU - Brandt, W. N.

AU - Del Moro, A.

AU - Hanish, D. J.

AU - Ivison, R. J.

AU - Juneau, S.

AU - Luo, B.

AU - Lutz, D.

AU - Sargent, M. T.

AU - Scott, D.

AU - Xue, Y. Q.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - We present a study of the infrared properties of X-ray selected, moderate-luminosity (i.e.LX= 1042-1044ergs-1) active galactic nuclei (AGNs) up toz≈ 3, in order to explore the links between star formation in galaxies and accretion on to their central black holes. We use 100 and 160μ mfluxes from GOODS-Herschel- the deepest survey yet undertaken by theHerscheltelescope - and show that in the vast majority of cases (i.e. >94percent) these fluxes are dominated by emission from the host galaxy. As such, these far-infrared bands provide an uncontaminated view of star formation in the AGN host galaxies. We find no evidence of any correlation between the X-ray and infrared luminosities of moderate AGNs at any redshift, suggesting that global star formation is decoupled from nuclear (i.e. AGN) activity in these galaxies. On the other hand, we confirm that the star formation rates of AGN hosts increase strongly with redshift, by a factor of 43+27- 18 fromz< 0.1 toz= 2-3 for AGNswith the same range of X-ray luminosities. This increase is entirely consistent with the factor of 25-50 increase in the specific star formation rates (SSFRs) of normal, star-forming (i.e. main-sequence) galaxies over the same redshift range. Indeed, the average SSFRs of AGN hosts are only marginally (i.e. ≈20percent) lower than those of main-sequence galaxies at all surveyed redshifts, with this small deficit being due to a fraction of AGNs residing in quiescent (i.e. low SSFR) galaxies. We estimate that 79 ± 10percent of moderate-luminosity AGNs are hosted in main-sequence galaxies, 15 ± 7percent in quiescent galaxies and <10percent in strongly starbursting galaxies. We derive the fractions of all main-sequence galaxies atz< 2 that are experiencing a period of moderate nuclear activity, noting that it is strongly dependent on galaxy stellar mass (Mstars), rising from just a fewpercent atMstars~ 1010 M⊙ to ≳20percent atMstars≥ 1011 M⊙. Our results indicate that it is galaxy stellar mass that is most important in dictating whether a galaxy hosts a moderate-luminosity AGN. We argue that the majority of moderate nuclear activity is fuelled by internal mechanisms rather than violent mergers, which suggests that high-redshift disc instabilities could be an important AGN feeding mechanism.

AB - We present a study of the infrared properties of X-ray selected, moderate-luminosity (i.e.LX= 1042-1044ergs-1) active galactic nuclei (AGNs) up toz≈ 3, in order to explore the links between star formation in galaxies and accretion on to their central black holes. We use 100 and 160μ mfluxes from GOODS-Herschel- the deepest survey yet undertaken by theHerscheltelescope - and show that in the vast majority of cases (i.e. >94percent) these fluxes are dominated by emission from the host galaxy. As such, these far-infrared bands provide an uncontaminated view of star formation in the AGN host galaxies. We find no evidence of any correlation between the X-ray and infrared luminosities of moderate AGNs at any redshift, suggesting that global star formation is decoupled from nuclear (i.e. AGN) activity in these galaxies. On the other hand, we confirm that the star formation rates of AGN hosts increase strongly with redshift, by a factor of 43+27- 18 fromz< 0.1 toz= 2-3 for AGNswith the same range of X-ray luminosities. This increase is entirely consistent with the factor of 25-50 increase in the specific star formation rates (SSFRs) of normal, star-forming (i.e. main-sequence) galaxies over the same redshift range. Indeed, the average SSFRs of AGN hosts are only marginally (i.e. ≈20percent) lower than those of main-sequence galaxies at all surveyed redshifts, with this small deficit being due to a fraction of AGNs residing in quiescent (i.e. low SSFR) galaxies. We estimate that 79 ± 10percent of moderate-luminosity AGNs are hosted in main-sequence galaxies, 15 ± 7percent in quiescent galaxies and <10percent in strongly starbursting galaxies. We derive the fractions of all main-sequence galaxies atz< 2 that are experiencing a period of moderate nuclear activity, noting that it is strongly dependent on galaxy stellar mass (Mstars), rising from just a fewpercent atMstars~ 1010 M⊙ to ≳20percent atMstars≥ 1011 M⊙. Our results indicate that it is galaxy stellar mass that is most important in dictating whether a galaxy hosts a moderate-luminosity AGN. We argue that the majority of moderate nuclear activity is fuelled by internal mechanisms rather than violent mergers, which suggests that high-redshift disc instabilities could be an important AGN feeding mechanism.

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