IR-derived covering factors for a large sample of quasars from WISE-UKIDSS-SDSS

I. G. Roseboom; A. Lawrence; M. Elvis; S. Petty; Yue Shen; H. Hao

doi:10.1093/mnras/sts441

IR-derived covering factors for a large sample of quasars from WISE-UKIDSS-SDSS

I. G. Roseboom, A. Lawrence, M. Elvis, S. Petty, Yue Shen, H. Hao

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

Abstract

We investigate the range of covering factors (determined from the ratio of IR to UV/optical luminosity) seen in luminous type 1 quasars using a combination of data from the Wide- Field Infrared Survey Explorer, UKIDSS and SDSS surveys. Accretion disc (UV/optical) and obscuring dust (IR) luminosities are measured via the use of a simple three-component SED model. We use these estimates to investigate the distribution of covering factors and its relationship to both accretion luminosity and IR SED shape. The distribution of covering factors (fC) is observed to be log-normal, with a bias-corrected mean of <log₁₀ fC ≥-0.41 and standard deviation of σ = 0.2. The fraction of IR luminosity emitted in the near-IR(1-5 μm) is found to be high (~40 per cent), and strongly dependant on covering factor.

Original language	English (US)
Pages (from-to)	1494-1501
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	429
Issue number	2
DOIs	https://doi.org/10.1093/mnras/sts441
State	Published - Feb 21 2013
Externally published	Yes

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Online availability

10.1093/mnras/sts441

Library availability

Discover UIUC Full Text

Cite this

@article{17d33da71d2f4f219022ec09ed03a6ba,

title = "IR-derived covering factors for a large sample of quasars from WISE-UKIDSS-SDSS",

abstract = "We investigate the range of covering factors (determined from the ratio of IR to UV/optical luminosity) seen in luminous type 1 quasars using a combination of data from the Wide- Field Infrared Survey Explorer, UKIDSS and SDSS surveys. Accretion disc (UV/optical) and obscuring dust (IR) luminosities are measured via the use of a simple three-component SED model. We use these estimates to investigate the distribution of covering factors and its relationship to both accretion luminosity and IR SED shape. The distribution of covering factors (fC) is observed to be log-normal, with a bias-corrected mean of 10 fC ≥-0.41 and standard deviation of σ = 0.2. The fraction of IR luminosity emitted in the near-IR(1-5 μm) is found to be high (~40 per cent), and strongly dependant on covering factor.",

author = "Roseboom, {I. G.} and A. Lawrence and M. Elvis and S. Petty and Yue Shen and H. Hao",

year = "2013",

month = feb,

day = "21",

doi = "10.1093/mnras/sts441",

language = "English (US)",

volume = "429",

pages = "1494--1501",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

TY - JOUR

T1 - IR-derived covering factors for a large sample of quasars from WISE-UKIDSS-SDSS

AU - Roseboom, I. G.

AU - Lawrence, A.

AU - Elvis, M.

AU - Petty, S.

AU - Shen, Yue

AU - Hao, H.

PY - 2013/2/21

Y1 - 2013/2/21

N2 - We investigate the range of covering factors (determined from the ratio of IR to UV/optical luminosity) seen in luminous type 1 quasars using a combination of data from the Wide- Field Infrared Survey Explorer, UKIDSS and SDSS surveys. Accretion disc (UV/optical) and obscuring dust (IR) luminosities are measured via the use of a simple three-component SED model. We use these estimates to investigate the distribution of covering factors and its relationship to both accretion luminosity and IR SED shape. The distribution of covering factors (fC) is observed to be log-normal, with a bias-corrected mean of 10 fC ≥-0.41 and standard deviation of σ = 0.2. The fraction of IR luminosity emitted in the near-IR(1-5 μm) is found to be high (~40 per cent), and strongly dependant on covering factor.

AB - We investigate the range of covering factors (determined from the ratio of IR to UV/optical luminosity) seen in luminous type 1 quasars using a combination of data from the Wide- Field Infrared Survey Explorer, UKIDSS and SDSS surveys. Accretion disc (UV/optical) and obscuring dust (IR) luminosities are measured via the use of a simple three-component SED model. We use these estimates to investigate the distribution of covering factors and its relationship to both accretion luminosity and IR SED shape. The distribution of covering factors (fC) is observed to be log-normal, with a bias-corrected mean of 10 fC ≥-0.41 and standard deviation of σ = 0.2. The fraction of IR luminosity emitted in the near-IR(1-5 μm) is found to be high (~40 per cent), and strongly dependant on covering factor.

UR - http://www.scopus.com/inward/record.url?scp=84874079061&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84874079061&partnerID=8YFLogxK

U2 - 10.1093/mnras/sts441

DO - 10.1093/mnras/sts441

M3 - Article

AN - SCOPUS:84874079061

SN - 0035-8711

VL - 429

SP - 1494

EP - 1501

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

IR-derived covering factors for a large sample of quasars from WISE-UKIDSS-SDSS

Abstract

ASJC Scopus subject areas

Online availability

Library availability

Related links

Fingerprint

Cite this