Article (Scientific journals)
Polarization of the changing-look quasar J1011+5442
Hutsemekers, Damien; Agis-Gonzalez, Beatriz; Sluse, Dominique et al.
2017In Astronomy and Astrophysics, 604, p. 3, pp.1-4
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Keywords :
quasars: emission lines; quasars: general
Abstract :
[en] If the disappearance of the broad emission lines observed in changing-look quasars were caused by the obscuration of the quasar core through moving dust clouds in the torus, high linear polarization typical of type 2 quasars would be expected. We measured the polarization of the changing-look quasar J1011+5442 in which the broad emission lines have disappeared between 2003 and 2015. We found a polarization degree compatible with null polarization. This measurement suggests that the observed change of look is not due to a change of obscuration hiding the continuum source and the broad line region, and that the quasar is seen close to the system axis. Our results thus support the idea that the vanishing of the broad emission lines in J1011+5442 is due to an intrinsic dimming of the ionizing continuum source that is most likely caused by a rapid decrease in the rate of accretion onto the supermassive black hole. Based on observations made with the William Herschel telescope operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hutsemekers, Damien ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Agis-Gonzalez, Beatriz ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Sluse, Dominique  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Ramos Almeida, C.;  Instituto de Astrofisica de Canarias, Calle Via Lactea, s/n, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofisica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
Acosta Pulido, J.-A.;  Instituto de Astrofisica de Canarias, Calle Via Lactea, s/n, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofisica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain)
Language :
English
Title :
Polarization of the changing-look quasar J1011+5442
Publication date :
01 July 2017
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
604
Pages :
L3, pp.1-4
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 August 2017

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