1. Quasars as tracers of cosmic flows
- Author
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Agnieszka Kurcz, Francesco Petrogalli, Magdalena Krupa, Maciej Bilicki, Bozena Czerny, J. Modzelewska, Krzysztof Hryniewicz, Andrzej Udalski, and Wojciech Pych
- Subjects
Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,COSMIC cancer database ,accretion disks ,Astrophysics::High Energy Astrophysical Phenomena ,Metallicity ,black hole physics ,CTS C30.10 [individual] ,FOS: Physical sciences ,Astronomy and Astrophysics ,Quasar ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Redshift ,emission line ,Accretion disc ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,quasar ,Emission spectrum ,Monochromatic color ,Astrophysics::Galaxy Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Quasars, as the most luminous persistent sources in the Universe, have broad applications for cosmological studies. In particular, they can be employed to directly measure the expansion history of the Universe, similarly to SNe Ia. The advantage of quasars is that they are numerous, cover a broad range of redshifts, up to $z = 7$, and do not show significant evolution of metallicity with redshift. The idea is based on the relation between the time delay of an emission line and the continuum, and the absolute monochromatic luminosity of a quasar. For intermediate redshift quasars, the suitable line is Mg II. Between December 2012 and March 2014, we performed five spectroscopic observations of the QSO CTS C30.10 ($z = 0.900$) using the South African Large Telesope (SALT), supplemented with photometric monitoring, with the aim of determining the variability of the line shape, changes in the total line intensity and in the continuum. We show that the method is very promising., Comment: Proceedings of IAU Symposium 308 "The Zeldovich Universe: Genesis and Growth of the Cosmic Web", 23-28 June 2014, Tallinn, Estonia
- Published
- 2014