The Close AGN Reference Survey (CARS) Mrk 1018 returns to the shadows after 30 years as a Seyfert 1

被引：110

作者：

McElroy, R. E. ^{[1
,2
]}

Husemann, B. ^{[3
]}

Croom, S. M. ^{[1
,2
]}

Davis, T. A. ^{[4
]}

Bennert, V. N. ^{[5
]}

Busch, G. ^{[6
]}

Combes, F. ^{[7
]}

Eckart, A. ^{[6
,8
]}

Perez-Torres, M. ^{[9
]}

Powell, M. ^{[10
]}

Scharwaechter, J. ^{[11
]}

Tremblay, G. R. ^{[10
]}

Urrutia, T. ^{[12
]}

机构：

[1] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

[2] ARC Ctr Excellence All Sky Astrophys CAASTRO, Redfern, NSW 2016, Australia

[3] ESO, Karl Schwarzschild Str 2, D-85478 Garching, Germany

[4] Cardiff Univ, Sch Phys & Astron, Queens Bldg, Cardiff CF24 3AA, S Glam, Wales

[5] Calif Polytech State Univ San Luis Obispo, Dept Phys, San Luis Obispo, CA 93407 USA

[6] Univ Cologne, Inst Phys 1, Zulpicher Str 77, D-50937 Cologne, Germany

[7] UPMC, Sorbonne Univ, CNRS, Coll France,PSL,Observ Paris,LERMA, F-75014 Paris, France

[8] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[9] Inst Astrofis Andalucia, Glorieta Astron S-N, Granada 18008, Spain

[10] Yale Univ, Yale Ctr Astron & Astrophys, 52 Hillhouse Ave, New Haven, CT 06511 USA

[11] Northern Operat Ctr, Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 USA

[12] Leibniz Institut Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 593卷

关键词：

galaxies: Seyfert; galaxies: individual: Mrk 1018; ACTIVE GALACTIC NUCLEI; BROAD H-ALPHA; TIDAL DISRUPTION; EMISSION-LINES; BLACK-HOLES; GALAXIES; SPECTRA; VARIABILITY; EVOLUTION; QUASARS;

D O I：

10.1051/0004-6361/201629102

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery that the known "changing look" AGN Mrk 1018 has changed spectral type for a second time. New VLT-MUSE data taken in 2015 as part of the Close AGN Reference Survey (CARS) shows that the AGN has returned to its original Seyfert 1.9 classification. The CARS sample is selected to contain only bright type 1 AGN, but Mrk 1018's broad emission lines and continuum, typical of type 1 AGN, have almost entirely disappeared. We use spectral fitting of the MUSE spectrum and previously available spectra to determine the drop in broad line flux and the Balmer decrement. We find that the broad line flux has decreased by a factor of 4.75 +/- 0.5 in H alpha since an SDSS spectrum was taken in 2000. The Balmer decrement has not changed significantly implying no enhanced reddening with time, but the remaining broad lines are more asymmetric than those present in the type 1 phase. We posit that the change is due to an intrinsic drop in flux from the accretion disk rather than variable extinction or a tidal disruption event.

引用

页数：4

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