A connection between obscuration and star formation in luminous quasars

Chien Ting J. Chen; Ryan C. Hickox; Stacey Alberts; Chris M. Harrison; David M. Alexander; Roberto Assef; Mark Brodwin; Michael J.I. Brown; Agnese Del Moro; William R. Forman; Varoujan Gorjian; Andrew D. Goulding; Kevin N. Hainline; Christine Jones; Christopher S. Kochanek; Stephen S. Murray; Alexandra Pope; Emmanouel Rovilos; Daniel Stern

doi:10.1088/0004-637X/802/1/50

A connection between obscuration and star formation in luminous quasars

Chien Ting J. Chen
, Ryan C. Hickox
, Stacey Alberts
, Chris M. Harrison
, David M. Alexander
, Roberto Assef
, Mark Brodwin
, Michael J.I. Brown
, Agnese Del Moro
, William R. Forman
, Varoujan Gorjian
, Andrew D. Goulding
, Kevin N. Hainline
, Christine Jones
, Christopher S. Kochanek
, Stephen S. Murray
, Alexandra Pope
, Emmanouel Rovilos
, Daniel Stern

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

We present a measurement of the star formation properties of a uniform sample of mid-IR-selected, optically unobscured, and obscured quasars (QSO1s and QSO2s) in the Boötessurvey region. We use a spectral energy distribution analysis for photometric data spanning optical to far-IR wavelengths to separate the active galactic nucleus (AGN) and host galaxy components. We find that when compared to a matched sample of QSO1s, the QSO2s have roughly twice the far-IR detection fractions, far-IR fluxes, and infrared star formation luminosities (L_IR ^SF). Correspondingly, we show that the AGN obscured fraction rises from 0.3 to 0.7 between (440) 10¹¹L_O. We also find evidence associating X-ray absorption with the presence of far-IR-emitting dust. Overall, these results are consistent with galaxy evolution models in which quasar obscuration is associated with dust-enshrouded starburst galaxies.

Original language	English (US)
Article number	50
Journal	Astrophysical Journal
Volume	802
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/802/1/50
State	Published - Mar 20 2015
Externally published	Yes

Keywords

X-rays: galaxies
galaxies: active
galaxies: starburst
infrared: galaxies
quasars: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/802/1/50

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Chen, C. T. J., Hickox, R. C., Alberts, S., Harrison, C. M., Alexander, D. M., Assef, R., Brodwin, M., Brown, M. J. I., Moro, A. D., Forman, W. R., Gorjian, V., Goulding, A. D., Hainline, K. N., Jones, C., Kochanek, C. S., Murray, S. S., Pope, A., Rovilos, E., & Stern, D. (2015). A connection between obscuration and star formation in luminous quasars. Astrophysical Journal, 802(1), Article 50. https://doi.org/10.1088/0004-637X/802/1/50

Chen, CTJ, Hickox, RC, Alberts, S, Harrison, CM, Alexander, DM, Assef, R, Brodwin, M, Brown, MJI, Moro, AD, Forman, WR, Gorjian, V, Goulding, AD, Hainline, KN, Jones, C, Kochanek, CS, Murray, SS, Pope, A, Rovilos, E & Stern, D 2015, 'A connection between obscuration and star formation in luminous quasars', Astrophysical Journal, vol. 802, no. 1, 50. https://doi.org/10.1088/0004-637X/802/1/50

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title = "A connection between obscuration and star formation in luminous quasars",

abstract = "We present a measurement of the star formation properties of a uniform sample of mid-IR-selected, optically unobscured, and obscured quasars (QSO1s and QSO2s) in the Bo{\"o}tessurvey region. We use a spectral energy distribution analysis for photometric data spanning optical to far-IR wavelengths to separate the active galactic nucleus (AGN) and host galaxy components. We find that when compared to a matched sample of QSO1s, the QSO2s have roughly twice the far-IR detection fractions, far-IR fluxes, and infrared star formation luminosities (LIR SF). Correspondingly, we show that the AGN obscured fraction rises from 0.3 to 0.7 between (440) 1011LO. We also find evidence associating X-ray absorption with the presence of far-IR-emitting dust. Overall, these results are consistent with galaxy evolution models in which quasar obscuration is associated with dust-enshrouded starburst galaxies.",

keywords = "X-rays: galaxies, galaxies: active, galaxies: starburst, infrared: galaxies, quasars: general",

author = "Chen, \{Chien Ting J.\} and Hickox, \{Ryan C.\} and Stacey Alberts and Harrison, \{Chris M.\} and Alexander, \{David M.\} and Roberto Assef and Mark Brodwin and Brown, \{Michael J.I.\} and Moro, \{Agnese Del\} and Forman, \{William R.\} and Varoujan Gorjian and Goulding, \{Andrew D.\} and Hainline, \{Kevin N.\} and Christine Jones and Kochanek, \{Christopher S.\} and Murray, \{Stephen S.\} and Alexandra Pope and Emmanouel Rovilos and Daniel Stern",

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T1 - A connection between obscuration and star formation in luminous quasars

AU - Chen, Chien Ting J.

AU - Hickox, Ryan C.

AU - Alberts, Stacey

AU - Harrison, Chris M.

AU - Alexander, David M.

AU - Assef, Roberto

AU - Brodwin, Mark

AU - Brown, Michael J.I.

AU - Moro, Agnese Del

AU - Forman, William R.

AU - Gorjian, Varoujan

AU - Goulding, Andrew D.

AU - Hainline, Kevin N.

AU - Jones, Christine

AU - Kochanek, Christopher S.

AU - Murray, Stephen S.

AU - Pope, Alexandra

AU - Rovilos, Emmanouel

AU - Stern, Daniel

PY - 2015/3/20

Y1 - 2015/3/20

N2 - We present a measurement of the star formation properties of a uniform sample of mid-IR-selected, optically unobscured, and obscured quasars (QSO1s and QSO2s) in the Boötessurvey region. We use a spectral energy distribution analysis for photometric data spanning optical to far-IR wavelengths to separate the active galactic nucleus (AGN) and host galaxy components. We find that when compared to a matched sample of QSO1s, the QSO2s have roughly twice the far-IR detection fractions, far-IR fluxes, and infrared star formation luminosities (LIR SF). Correspondingly, we show that the AGN obscured fraction rises from 0.3 to 0.7 between (440) 1011LO. We also find evidence associating X-ray absorption with the presence of far-IR-emitting dust. Overall, these results are consistent with galaxy evolution models in which quasar obscuration is associated with dust-enshrouded starburst galaxies.

AB - We present a measurement of the star formation properties of a uniform sample of mid-IR-selected, optically unobscured, and obscured quasars (QSO1s and QSO2s) in the Boötessurvey region. We use a spectral energy distribution analysis for photometric data spanning optical to far-IR wavelengths to separate the active galactic nucleus (AGN) and host galaxy components. We find that when compared to a matched sample of QSO1s, the QSO2s have roughly twice the far-IR detection fractions, far-IR fluxes, and infrared star formation luminosities (LIR SF). Correspondingly, we show that the AGN obscured fraction rises from 0.3 to 0.7 between (440) 1011LO. We also find evidence associating X-ray absorption with the presence of far-IR-emitting dust. Overall, these results are consistent with galaxy evolution models in which quasar obscuration is associated with dust-enshrouded starburst galaxies.

KW - X-rays: galaxies

KW - galaxies: active

KW - galaxies: starburst

KW - infrared: galaxies

KW - quasars: general

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JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

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A connection between obscuration and star formation in luminous quasars

Abstract

Keywords

ASJC Scopus subject areas

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