Article (Scientific journals)
Time-delay Measurement of Mg II Broad-line Response for the Highly Accreting Quasar HE 0413-4031: Implications for the Mg II-based Radius-Luminosity Relation
Zajaček, Michal; Czerny, Bozena; Martinez-Aldama, Mary Loli et al.
2020In Astrophysical Journal, 896 (2), p. 146
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Keywords :
Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] We present the monitoring of the active galactic nuclei continuum and Mg ii broad-line emission for the quasar HE 0413-4031 (z = 1.38) based on the six-year monitoring by the South African Large Telescope (SALT). We manage to estimate a time-delay of 302.6-33.1+28.7 days in the rest frame of the source using seven different methods: interpolated cross-correlation function, discrete correlation function (DCF), z-transformed DCF, JAVELIN, two estimators of data regularity (Von Neumann, Bartels), and χ 2 method. This time-delay is below the value expected from the standard radius-luminosity relation. However, based on the monochromatic luminosity of the source and the spectral energy distribution modeling, we interpret this departure as the shortening of the time-delay due to the higher accretion rate of the source, with the inferred Eddington ratio of ∼0.4. The Mg ii line luminosity of HE 0413-4031 responds to the continuum variability as LlineαLcont0.43±0.10, which is consistent with the light-travel distance of the location of Mg ii emission at R out ∼ 1018 cm. Using the data of 10 other quasars, we confirm the radius-luminosity relation for the broad Mg ii line, which was previously determined for the broad Hβ line for lower-redshift sources. In addition, we detect a general departure of higher-accreting quasars from this relation in analogy to the Hβ sample. After the accretion-rate correction of the light-travel distance, the Mg ii-based radius-luminosity relation has a small scatter of only 0.10 dex.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Zajaček, Michal ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Czerny, Bozena ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Martinez-Aldama, Mary Loli ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Rałowski, Mateusz ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Olejak, Aleksandra ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Panda, Swayamtrupta ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland ; Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
Hryniewicz, Krzysztof ;  Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
Śniegowska, Marzena ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Naddaf Moghaddam, Mohammad Hassan  ;  Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Pych, Wojtek;  Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
Pietrzyński, Grzegorz ;  Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
Figaredo, C. Sobrino ;  Astronomisches Institut, Ruhr Universitaet Bochum, Germany
Haas, Martin ;  Astronomisches Institut, Ruhr Universitaet Bochum, Germany
Średzińska, Justyna;  Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
Krupa, Magdalena;  Astronomical Observatory of the Jagiellonian University, Cracow, Poland
Kurcz, Agnieszka;  Astronomical Observatory of the Jagiellonian University, Cracow, Poland
Udalski, Andrzej ;  Astronomical Observatory, University of Warsaw, Warsaw, Poland
Gorski, Marek ;  Departamento de Astronomia, Universidad de Concepcion, Chile
Sarna, Marek ;  Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
More authors (9 more) Less
Language :
English
Title :
Time-delay Measurement of Mg II Broad-line Response for the Highly Accreting Quasar HE 0413-4031: Implications for the Mg II-based Radius-Luminosity Relation
Publication date :
20 June 2020
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
IOP Publishing Ltd
Volume :
896
Issue :
2
Pages :
146
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
NCN - National Science Centre Poland
MNiSW - Polish Ministry of Science and Higher Education
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