NuSTAR observations of four nearby X-ray faint AGNs: low luminosity or heavy obscuration?

被引：20

作者：

Annuar, A. ^{[1
,2
]}

Alexander, D. M. ^{[2
]}

Gandhi, P. ^{[3
]}

Lansbury, G. B. ^{[4
,5
]}

Asmus, D. ^{[3
,6
]}

Balokovic, M. ^{[7
,8
]}

Ballantyne, D. R. ^{[9
]}

Bauer, F. E. ^{[10
,11
,12
,13
]}

Boorman, P. G. ^{[3
,14
]}

Brandt, W. N. ^{[15
,16
,17
]}

Brightman, M. ^{[18
]}

Chen, C-T J. ^{[19
]}

Del Moro, A. ^{[20
]}

Farrah, D. ^{[21
,22
]}

Harrison, F. A. ^{[18
]}

Koss, M. J. ^{[23
]}

Lanz, L. ^{[24
]}

Marchesi, S. ^{[25
,26
]}

Masini, A. ^{[27
]}

Nardini, E. ^{[2
,28
,29
]}

Ricci, C. ^{[30
,31
,32
]}

Stern, D. ^{[33
]}

Zappacosta, L. ^{[34
]}

机构：

[1] Univ Kebangsaan Malaysia, Dept Appl Phys, Fac Sci & Technol, Bangi 43600, Malaysia

[2] Univ Durham, Dept Phys, Ctr Extragalact Astron, Durham DH1 3LE, England

[3] Univ Southampton, Fac Phys Sci & Engn, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England

[4] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[5] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[6] European Southern Observ, Casilla 19001, Santiago, Chile

[7] Ctr Astrophys & Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02140 USA

[8] Harvard Univ, Black Hole Initiat, 20 Garden St, Cambridge, MA 02140 USA

[9] Georgia Inst Technol, Sch Phys, Ctr Relativist Astrophys, Atlanta, GA 30332 USA

[10] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile

[11] Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Casilla 306, Santiago 22, Chile

[12] Millennium Inst Astrophys MAS, Nuncio Monsen Sotero Sanz 100, Santiago, Chile

[13] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA

[14] Acad Sci, Astron Inst, Bocni 2 1401, CZ-14131 Prague, Czech Republic

[15] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

[16] Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA

[17] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[18] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[19] Marshall Space Flight Ctr, Huntsville, AL 35811 USA

[20] Max Planck Inst Extraterr Phys MPE, Postfach 1312, D-85741 Garching, Germany

[21] Univ Hawaii, Dept Phys & Astron, 2505 Correa Rd, Honolulu, HI 96822 USA

[22] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[23] Eureka Sci, 2452 Delmer St Suite 100, Oakland, CA 94602 USA

[24] Coll New Jersey, Dept Phys, 2000 Pennington Rd, Ewing, NJ 08628 USA

[25] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

[26] Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA

[27] SISSA, Via Bonomea 265, I-34151 Trieste, Italy

[28] Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Florence, Italy

[29] Ist Nazl Astrofis INAF, Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

[30] Univ Diego Portales, Nucleo Astron, Fac Ingn, Av Ejercito Libertador 441, Santiago, Chile

[31] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[32] George Mason Univ, Dept Phys & Astron, MS 3F3,4400 Univ Dr, Fairfax, VA 22030 USA

[33] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr,Mail Stop 169-221, Pasadena, CA 91109 USA

[34] Observ Astron Roma INAF, Via Frascati 33, I-00040 Rome, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 497卷 / 01期

基金：

英国科学技术设施理事会; 美国国家航空航天局; 欧盟地平线“2020”;

关键词：

galaxies: active; X-rays: individual: ESO 121-G6; X-rays: individual: NGC660; X-rays: individual: NGC3486; X-rays: individual: NGC 5195; ACTIVE GALACTIC NUCLEI; COMPTON-THICK AGN; BLACK-HOLE MASS; SUBARCSECOND MIDINFRARED VIEW; SPECTRAL ENERGY-DISTRIBUTIONS; ADVECTION-DOMINATED ACCRETION; XMM-NEWTON OBSERVATIONS; SEYFERT; GALAXIES; FIELD NORTH SURVEY; BROAD-LINE REGION;

D O I：

10.1093/mnras/staa1820

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present NuSTAR (Nuclear Spectroscopic Telescope Array) observations of four active galactic nuclei (AGNs) located within 15 Mpc. These AGNs, namely ESO 121-G6, NGC 660, NGC 3486, and NGC 5195, have observed X-ray luminosities of L-2-10 keV,L-obs less than or similar to 10(39) erg s(-1), classifying them as low-luminosity AGN (LLAGN). We perform broad-band X-ray spectral analysis for the AGN by combining our NuSTAR data with Chandra or XMM-Newton observations to directly measure their column densities (N-H) and infer their intrinsic power. We complement our X-ray data with archival and new high-angular resolution mid-infrared (mid-IR) data for all objects, except NGC 5195. Based on our X-ray spectral analysis, we found that both ESO 121-G6 and NGC 660 are heavily obscured (N-H > 10(23) cm(-2); L-2-10 keV,L-int similar to 10(41) erg s(-1)), and NGC 660 may be Compton thick. We also note that the X-ray flux and spectral slope for ESO 121-G6 have significantly changed over the last decade, indicating significant changes in the obscuration and potentially accretion rate. On the other hand, NGC 3486 and NGC 5195 appear to be unobscured and just mildly obscured, respectively, with L-2-10 keV,L-int < 10(39) erg s(-1), i.e. genuine LLAGN. Both of the heavily obscured AGNs have L-bol > 10(41) erg s(-1) and lambda(Edd) greater than or similar to 10(-3), and are detected in high-angular resolutionmid-IR imaging, indicating the presence of obscuring dust on nuclear scale. NGC 3486, however, is undetected in high-resolution mid-IR imaging, and the current data do not provide stringent constraints on the presence or absence of obscuring nuclear dust in the AGN.

引用

页码：229 / 245

页数：17

共 118 条

[1] The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼5 [J].