The geometry of the infrared and x-ray obscurer in a dusty hyperluminous quasar

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Title: The geometry of the infrared and x-ray obscurer in a dusty hyperluminous quasar
Authors: Farrah, D
Balokovic, M
Stern, D
Harris, K
Kunimoto, M
Walton, DJ
Alexander, DM
Arevalo, P
Ballantyne, DR
Bauer, FE
Boggs, S
Brandt, WN
Brightman, M
Christensen, F
Clements, DL
Craig, W
Fabian, A
Hailey, C
Harrison, F
Koss, M
Lansbury, GB
Luo, B
Paine, J
Petty, S
Pitchford, K
Ricci, C
Zhang, W
Item Type: Journal Article
Abstract: We study the geometry of the active galactic nucleus (AGN) obscurer in IRAS 09104+4109, an IR-luminous, radio-intermediate FR-I source at z = 0.442, using infrared data from Spitzer and Herschel, X-ray data from NuSTAR, Swift, Suzaku, and Chandra, and an optical spectrum from Palomar. The infrared data imply a total rest-frame 1–1000 μm luminosity of 5.5 × 1046 erg s−1 and require both an AGN torus and a starburst model. The AGN torus has an anisotropy-corrected IR luminosity of 4.9 × 1046 erg s−1 and a viewing angle and half-opening angle both of approximately 36° from pole-on. The starburst has a star formation rate of (110 ± 34) M ⊙ yr−1 and an age of <50 Myr. These results are consistent with two epochs of luminous activity in IRAS 09104+4109: one approximately 150 Myr ago, and one ongoing. The X-ray data suggest a photon index of Γ sime 1.8 and a line-of-sight column density of N H sime 5 × 1023 cm−2. This argues against a reflection-dominated hard X-ray spectrum, which would have implied a much higher N H and luminosity. The X-ray and infrared data are consistent with a bolometric AGN luminosity of L bol ~ (0.5–2.5) × 1047 erg s−1. The X-ray and infrared data are further consistent with coaligned AGN obscurers in which the line of sight "skims" the torus. This is also consistent with the optical spectra, which show both coronal iron lines and broad lines in polarized but not direct light. Combining constraints from the X-ray, optical, and infrared data suggest that the AGN obscurer is within a vertical height of 20 pc, and a radius of 125 pc, of the nucleus.
Issue Date: 27-Oct-2016
Date of Acceptance: 14-Jun-2016
ISSN: 0004-637X
Publisher: American Astronomical Society
Journal / Book Title: Astrophysical Journal
Volume: 831
Issue: 1
Copyright Statement: © 2016. The American Astronomical Society. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: evolution
galaxies: individual (IRAS 09104+4109)
galaxies: Seyfert
galaxies: starburst
infrared: galaxies
X-rays: galaxies
IRAS 09104+4109
0201 Astronomical And Space Sciences
0305 Organic Chemistry
0306 Physical Chemistry (Incl. Structural)
Publication Status: Published
Open Access location:
Article Number: ARTN 76
Appears in Collections:Physics

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