Investigating the Covering Fraction Distribution of Swift/BAT AGNs with X-Ray and Infrared Observations

被引:13
作者
Lanz, Lauranne [1 ]
Hickox, Ryan C. [1 ]
Balokovic, Mislav [2 ]
Shimizu, Taro [3 ]
Ricci, Claudio [4 ,5 ,6 ]
Goulding, Andy D. [7 ]
Ballantyne, David R. [8 ]
Bauer, Franz E. [4 ,9 ,10 ]
Chen, Chien-Ting J. [11 ]
del Moro, Agnese [3 ]
Farrah, Duncan [12 ]
Michael, J. Koss [13 ]
LaMassa, Stephanie [14 ]
Masini, Alberto [1 ,15 ,16 ]
Zappacosta, Luca [17 ]
机构
[1] Dartmouth Coll, Dept Phys & Astron, 6127 Wilder Lab, Hanover, NH 03755 USA
[2] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
[3] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85741 Garshing, Germany
[4] Unversidad Diego Potales, Nucleo Astron Falcultad Ingn, Av Ejercito Libertador 441, Santiago, Chile
[5] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
[6] Chinese Acad Sci, South Amer Ctr Astron, Camino El Observ 1515, Santiago, Chile
[7] Princeton Univ, Dept Astrophys, Princeton, NJ 08544 USA
[8] Georgia Inst Technol, Sch Phys, Ctr Relativist Astrophys, 837 State St, Atlanta, GA 30332 USA
[9] Millennium Inst Astrophys MAS, Nuncio Monsenor Sotero Sanz 100, Santiago, Chile
[10] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA
[11] Penn State Univ, Dept Astron & Astrophys, 514 Davey Lab, University Pk, PA 16802 USA
[12] Virginia Tech, Dept Phys, 850 West Campus Dr, Blacksburg, VA 24061 USA
[13] Eureka Sci Inc, 2542 Delmar Ave,Suite 100, Oakland, CA 94602 USA
[14] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
[15] INAF Osservatorio Astron Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy
[16] Univ Bologna, Dipartimento Fis & Astron DIFA, Via Gobetti 93-2, I-40129 Bologna, Italy
[17] INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy
基金
美国国家科学基金会;
关键词
galaxies: active; galaxies: nuclei; galaxies: Seyfert; X-rays: galaxies; infrared: galaxies; ACTIVE GALACTIC NUCLEI; SUPERMASSIVE BLACK-HOLES; SUBARCSECOND MIDINFRARED VIEW; SPECTRAL MODEL; LOCAL UNIVERSE; DUSTY TORI; MU-M; LUMINOSITY; GALAXIES; EMISSION;
D O I
10.3847/1538-4357/aaee6c
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present an analysis of a sample of 69 local obscured Swift/Burst Alert Telescope active galactic nuclei (AGNs) with X-ray spectra from NuSTAR and infrared (IR) spectral energy distributions from Herschel and WISE. We combine this X-ray and IR phenomenological modeling and find a significant correlation between reflected hard X-ray emission and IR AGN emission, with suggestive indications that this correlation may be stronger than the one between intrinsic hard X-ray and IR emissions. This relation between the IR and reflected X-ray emission suggests that both are the result of the processing of intrinsic emission from the corona and accretion disk by the same structure. We explore the resulting implications on the underlying distribution of covering fraction for all AGNs, by generating mock observables for the reflection parameter and IR luminosity ratio using empirical relations found for the covering fraction with each quantity. We find that the observed distributions of the reflection parameter and IR-to-X-ray ratio are reproduced with broad distributions centered around covering fractions of at least similar to 40%-50%, whereas narrower distributions match our observations only when centered around covering fractions of similar to 70%-80%. Our results are consistent with both independent estimates of the covering fractions of individual objects and the typical covering fraction obtained on the basis of obscured fractions for samples of AGNs. These results suggest that the level of reprocessing in AGNs, including X-ray reflection, is related in a relatively straightforward way to the geometry of the obscuring material.
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页数:19
相关论文
共 117 条
[1]   What drives the growth of black holes? [J].
Alexander, D. M. ;
Hickox, R. C. .
NEW ASTRONOMY REVIEWS, 2012, 56 (04) :93-121
[2]   TORUS AND ACTIVE GALACTIC NUCLEUS PROPERTIES OF NEARBY SEYFERT GALAXIES: RESULTS FROM FITTING INFRARED SPECTRAL ENERGY DISTRIBUTIONS AND SPECTROSCOPY [J].
Alonso-Herrero, Almudena ;
Almeida, Cristina Ramos ;
Mason, Rachel ;
Asensio Ramos, Andres ;
Roche, Patrick F. ;
Levenson, Nancy A. ;
Elitzur, Moshe ;
Packham, Christopher ;
Rodriguez Espinosa, Jose Miguel ;
Young, Stuart ;
Diaz-Santos, Tanio ;
Perez-Garcia, Ana M. .
ASTROPHYSICAL JOURNAL, 2011, 736 (02)
[3]   NuSTAR OBSERVATIONS OF THE COMPTON-THICK ACTIVE GALACTIC NUCLEUS AND ULTRALUMINOUS X-RAY SOURCE CANDIDATE IN NGC 5643 [J].
Annuar, A. ;
Gandhi, P. ;
Alexander, D. M. ;
Lansbury, G. B. ;
Arevalo, P. ;
Ballantyne, D. R. ;
Balokovic, M. ;
Bauer, F. E. ;
Boggs, S. E. ;
Brandt, W. N. ;
Brightman, M. ;
Christensen, F. E. ;
Craig, W. W. ;
Del Moro, A. ;
Hailey, C. J. ;
Harrison, F. A. ;
Hickox, R. C. ;
Matt, G. ;
Puccetti, S. ;
Ricci, C. ;
Rigby, J. R. ;
Stern, D. ;
Walton, D. J. ;
Zappacosta, L. ;
Zhang, W. .
ASTROPHYSICAL JOURNAL, 2015, 815 (01)
[4]   UNIFIED MODELS FOR ACTIVE GALACTIC NUCLEI AND QUASARS [J].
ANTONUCCI, R .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1993, 31 :473-521
[5]  
Arnaud KA, 1996, ASTR SOC P, V101, P17
[6]   The subarcsecond mid-infrared view of local active galactic nuclei - II. The mid-infrared-X-ray correlation [J].
Asmus, D. ;
Gandhi, P. ;
Hoenig, S. F. ;
Smette, A. ;
Duschl, W. J. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 454 (01) :766-803
[7]   The subarcsecond mid-infrared view of local active galactic nuclei - I. The N- and Q-band imaging atlas☆ [J].
Asmus, D. ;
Hoenig, S. F. ;
Gandhi, P. ;
Smette, A. ;
Duschl, W. J. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 439 (02) :1648-1679
[8]   Mid-infrared properties of nearby low-luminosity AGN at high angular resolution [J].
Asmus, D. ;
Gandhi, P. ;
Smette, A. ;
Hoenig, S. F. ;
Duschl, W. J. .
ASTRONOMY & ASTROPHYSICS, 2011, 536
[9]   New Spectral Model for Constraining Torus Covering Factors from Broadband X-Ray Spectra of Active Galactic Nuclei [J].
Balokovic, M. ;
Brightman, M. ;
Harrison, F. A. ;
Comastri, A. ;
Ricci, C. ;
Buchner, J. ;
Gandhi, P. ;
Farrah, D. ;
Stern, D. .
ASTROPHYSICAL JOURNAL, 2018, 854 (01)
[10]   THE NuSTAR VIEW OF NEARBY COMPTON-THICK ACTIVE GALACTIC NUCLEI: THE CASES OF NGC 424, NGC 1320, AND IC 2560 [J].
Balokovic, M. ;
Comastri, A. ;
Harrison, F. A. ;
Alexander, D. M. ;
Ballantyne, D. R. ;
Bauer, F. E. ;
Boggs, S. E. ;
Brandt, W. N. ;
Brightman, M. ;
Christensen, F. E. ;
Craig, W. W. ;
Del Moro, A. ;
Gandhi, P. ;
Hailey, C. J. ;
Koss, M. ;
Lansbury, G. B. . ;
Luo, B. ;
Madejski, G. M. ;
Marinucci, A. ;
Matt, G. ;
Markwardt, C. B. ;
Puccetti, S. ;
Reynolds, C. S. ;
Risaliti, G. ;
Rivers, E. ;
Stern, D. ;
Walton, D. J. ;
Zhang, W. W. .
ASTROPHYSICAL JOURNAL, 2014, 794 (02)