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SALT long-slit spectroscopy of LBQS 2113-4538 : variability of the Mg II and Fe II component
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SALT long-slit spectroscopy of LBQS 2113-4538 : variability of the Mg II and Fe II component
Bibliographic description
| title: | SALT long-slit spectroscopy of LBQS 2113-4538 : variability of the Mg II and Fe II component |
| author: | Hryniewicz Krzysztof, Czerny Bożena, Pych Wojciech, Udalski Andrzej, Krupa Magdalena  , Świętoń Agnieszka , Kałużny Janusz |
| journal title: | Astronomy & Astrophysics |
| volume: | 562 |
| date of publication : | 2014 |
| article ID: | A34 |
| ISSN: |
0004-6361 |
| eISSN: |
1432-0746 |
| DOI: | |
| notes: | Reproduced with permission from Astronomy & Astrophysics, © ESO |
| language: | English |
| journal language: | English |
| abstract in English: | Context. The Mg II line is of extreme importance in intermediate redshift quasars since it allows us to measure the black hole mass in these sources and to use these sources as probes of the distribution of dark energy in the Universe, as a complementary tool to SN Ia. Aims. Reliable use of Mg II requires a good understanding of all the systematic effects involved in the measurement of the line properties, including the contamination by Fe II UV emission. Methods. We performed three spectroscopic observations of a quasar LBQS 2113-4538 (z = 0.956) with the SALT telescope, separated in time by several months and we analyze in detail the mean spectrum and the variability in the spectral shape. Results. We show that even in our good-quality spectra the Mg II doublet is well fit by a single Lorentzian shape. We tested several models of the Fe II pseudo-continuum and showed that one of them well represents all the data. The amplitudes of both components vary in time, but the shapes do not change significantly. The measured line width of LBQS 2113-4538 identifies this object as a class A quasar. The upper limit of 3% for the contribution of the narrow line region (NLR) to Mg II may suggest that the separation of the broad line region and NLR disappears in this class of objects. |
| keywords in English: | dark energy, quasars: emission lines, quasars: individual: LBQS 2113-4538 |
| affiliation: | Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne |
| type: | journal article |
| subtype: | academic paper |
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Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa
Projekt „Repozytorium otwartego dostępu do dorobku naukowego i dydaktycznego UJ” współfinansowany w ramach poddziałania 2.3.1 „Cyfrowe udostępnianie zasobów nauki” Programu Operacyjnego Polska Cyfrowa z Europejskiego Funduszu Rozwoju Regionalnego i budżetu państwa na podstawie umowy o dofinansowanie nr POPC.02.03.01-00-0030/17-00
