Secular evolution and A non-evolving black-hole-to-galaxy mass ratio in the last 7Gyr

Mauricio Cisternas, Knud Jahnke, Angela Bongiorno, Katherine J. Inskip, Christopher D Impey, Anton M. Koekemoer, Andrea Merloni, Mara Salvato, Jonathan R. Trump

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

We present new constraints on the ratio of black hole (BH) mass to total galaxy stellar mass at 0.3 < z < 0.9 for a sample of 32 type-1 active galactic nuclei (AGNs) from the XMM-COSMOS survey covering the range M BH 107.2 - 8.7 M⊙. Virial M BH estimates based on Hβ are available from the COSMOS Magellan/IMACS survey. We use high-resolution Hubble Space Telescope (HST) imaging to decompose the light of each type-1 AGN and host galaxy, and employ a specially built mass-to-light ratio to estimate the stellar masses (M *). The M BH-M * ratio shows a zero offset with respect to the local relation for galactic bulge masses, and we also find no evolution in the mass ratio M BH/M *(1 + z)0.02 0.34 up to z 0.9. Interestingly, at the high-M BH end there is a positive offset from the z = 0 relation, which can be fully explained by a mass function bias with a cosmic scatter of σμ = 0.3, reaffirming that the intrinsic distribution is consistent with zero evolution. From our results we conclude that since z 0.9 no substantial addition of stellar mass is required: the decline in star formation rates and merger activity at z < 1 support this scenario. Nevertheless, given that a significant fraction of these galaxies show a disk component, their bulges are indeed undermassive. This is a direct indication that for the last 7Gyr the only essential mechanism required for these galaxies to obey the z = 0 relation is a redistribution of stellar mass to the bulge, likely driven by secular processes, i.e., internal instabilities and minor merging.

Original languageEnglish (US)
Article numberL11
JournalAstrophysical Journal Letters
Volume741
Issue number1
DOIs
StatePublished - Nov 1 2011

Fingerprint

mass ratios
galaxies
stellar mass
active galactic nuclei
mass to light ratios
galactic bulge
XMM-Newton telescope
estimates
star formation rate
Hubble Space Telescope
indication
coverings
merger
high resolution

Keywords

  • galaxies: active
  • galaxies: evolution
  • galaxies: nuclei

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Cisternas, M., Jahnke, K., Bongiorno, A., Inskip, K. J., Impey, C. D., Koekemoer, A. M., ... Trump, J. R. (2011). Secular evolution and A non-evolving black-hole-to-galaxy mass ratio in the last 7Gyr. Astrophysical Journal Letters, 741(1), [L11]. https://doi.org/10.1088/2041-8205/741/1/L11

Secular evolution and A non-evolving black-hole-to-galaxy mass ratio in the last 7Gyr. / Cisternas, Mauricio; Jahnke, Knud; Bongiorno, Angela; Inskip, Katherine J.; Impey, Christopher D; Koekemoer, Anton M.; Merloni, Andrea; Salvato, Mara; Trump, Jonathan R.

In: Astrophysical Journal Letters, Vol. 741, No. 1, L11, 01.11.2011.

Research output: Contribution to journalArticle

Cisternas, M, Jahnke, K, Bongiorno, A, Inskip, KJ, Impey, CD, Koekemoer, AM, Merloni, A, Salvato, M & Trump, JR 2011, 'Secular evolution and A non-evolving black-hole-to-galaxy mass ratio in the last 7Gyr', Astrophysical Journal Letters, vol. 741, no. 1, L11. https://doi.org/10.1088/2041-8205/741/1/L11
Cisternas, Mauricio ; Jahnke, Knud ; Bongiorno, Angela ; Inskip, Katherine J. ; Impey, Christopher D ; Koekemoer, Anton M. ; Merloni, Andrea ; Salvato, Mara ; Trump, Jonathan R. / Secular evolution and A non-evolving black-hole-to-galaxy mass ratio in the last 7Gyr. In: Astrophysical Journal Letters. 2011 ; Vol. 741, No. 1.
@article{c4cbe6eb87954613938d70d40fa574cc,
title = "Secular evolution and A non-evolving black-hole-to-galaxy mass ratio in the last 7Gyr",
abstract = "We present new constraints on the ratio of black hole (BH) mass to total galaxy stellar mass at 0.3 < z < 0.9 for a sample of 32 type-1 active galactic nuclei (AGNs) from the XMM-COSMOS survey covering the range M BH 107.2 - 8.7 M⊙. Virial M BH estimates based on Hβ are available from the COSMOS Magellan/IMACS survey. We use high-resolution Hubble Space Telescope (HST) imaging to decompose the light of each type-1 AGN and host galaxy, and employ a specially built mass-to-light ratio to estimate the stellar masses (M *). The M BH-M * ratio shows a zero offset with respect to the local relation for galactic bulge masses, and we also find no evolution in the mass ratio M BH/M *(1 + z)0.02 0.34 up to z 0.9. Interestingly, at the high-M BH end there is a positive offset from the z = 0 relation, which can be fully explained by a mass function bias with a cosmic scatter of σμ = 0.3, reaffirming that the intrinsic distribution is consistent with zero evolution. From our results we conclude that since z 0.9 no substantial addition of stellar mass is required: the decline in star formation rates and merger activity at z < 1 support this scenario. Nevertheless, given that a significant fraction of these galaxies show a disk component, their bulges are indeed undermassive. This is a direct indication that for the last 7Gyr the only essential mechanism required for these galaxies to obey the z = 0 relation is a redistribution of stellar mass to the bulge, likely driven by secular processes, i.e., internal instabilities and minor merging.",
keywords = "galaxies: active, galaxies: evolution, galaxies: nuclei",
author = "Mauricio Cisternas and Knud Jahnke and Angela Bongiorno and Inskip, {Katherine J.} and Impey, {Christopher D} and Koekemoer, {Anton M.} and Andrea Merloni and Mara Salvato and Trump, {Jonathan R.}",
year = "2011",
month = "11",
day = "1",
doi = "10.1088/2041-8205/741/1/L11",
language = "English (US)",
volume = "741",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Secular evolution and A non-evolving black-hole-to-galaxy mass ratio in the last 7Gyr

AU - Cisternas, Mauricio

AU - Jahnke, Knud

AU - Bongiorno, Angela

AU - Inskip, Katherine J.

AU - Impey, Christopher D

AU - Koekemoer, Anton M.

AU - Merloni, Andrea

AU - Salvato, Mara

AU - Trump, Jonathan R.

PY - 2011/11/1

Y1 - 2011/11/1

N2 - We present new constraints on the ratio of black hole (BH) mass to total galaxy stellar mass at 0.3 < z < 0.9 for a sample of 32 type-1 active galactic nuclei (AGNs) from the XMM-COSMOS survey covering the range M BH 107.2 - 8.7 M⊙. Virial M BH estimates based on Hβ are available from the COSMOS Magellan/IMACS survey. We use high-resolution Hubble Space Telescope (HST) imaging to decompose the light of each type-1 AGN and host galaxy, and employ a specially built mass-to-light ratio to estimate the stellar masses (M *). The M BH-M * ratio shows a zero offset with respect to the local relation for galactic bulge masses, and we also find no evolution in the mass ratio M BH/M *(1 + z)0.02 0.34 up to z 0.9. Interestingly, at the high-M BH end there is a positive offset from the z = 0 relation, which can be fully explained by a mass function bias with a cosmic scatter of σμ = 0.3, reaffirming that the intrinsic distribution is consistent with zero evolution. From our results we conclude that since z 0.9 no substantial addition of stellar mass is required: the decline in star formation rates and merger activity at z < 1 support this scenario. Nevertheless, given that a significant fraction of these galaxies show a disk component, their bulges are indeed undermassive. This is a direct indication that for the last 7Gyr the only essential mechanism required for these galaxies to obey the z = 0 relation is a redistribution of stellar mass to the bulge, likely driven by secular processes, i.e., internal instabilities and minor merging.

AB - We present new constraints on the ratio of black hole (BH) mass to total galaxy stellar mass at 0.3 < z < 0.9 for a sample of 32 type-1 active galactic nuclei (AGNs) from the XMM-COSMOS survey covering the range M BH 107.2 - 8.7 M⊙. Virial M BH estimates based on Hβ are available from the COSMOS Magellan/IMACS survey. We use high-resolution Hubble Space Telescope (HST) imaging to decompose the light of each type-1 AGN and host galaxy, and employ a specially built mass-to-light ratio to estimate the stellar masses (M *). The M BH-M * ratio shows a zero offset with respect to the local relation for galactic bulge masses, and we also find no evolution in the mass ratio M BH/M *(1 + z)0.02 0.34 up to z 0.9. Interestingly, at the high-M BH end there is a positive offset from the z = 0 relation, which can be fully explained by a mass function bias with a cosmic scatter of σμ = 0.3, reaffirming that the intrinsic distribution is consistent with zero evolution. From our results we conclude that since z 0.9 no substantial addition of stellar mass is required: the decline in star formation rates and merger activity at z < 1 support this scenario. Nevertheless, given that a significant fraction of these galaxies show a disk component, their bulges are indeed undermassive. This is a direct indication that for the last 7Gyr the only essential mechanism required for these galaxies to obey the z = 0 relation is a redistribution of stellar mass to the bulge, likely driven by secular processes, i.e., internal instabilities and minor merging.

KW - galaxies: active

KW - galaxies: evolution

KW - galaxies: nuclei

UR - http://www.scopus.com/inward/record.url?scp=80054987363&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80054987363&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/741/1/L11

DO - 10.1088/2041-8205/741/1/L11

M3 - Article

AN - SCOPUS:80054987363

VL - 741

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 1

M1 - L11

ER -