Počet záznamů: 1
A metal-line strength indicator for damped Lyman alpha (DLA) systems at low signal-to-noise
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SYSNO ASEP 0545811 Druh ASEP J - Článek v odborném periodiku Zařazení RIV Záznam nebyl označen do RIV Poddruh J Článek ve WOS Název A metal-line strength indicator for damped Lyman alpha (DLA) systems at low signal-to-noise Tvůrce(i) Arinyo i Prats, Andreu (UIVT-O) SAI
Mas Ribas, L. (ES)
Miralda Escude, J. (ES)
Perez Rafols, I. (FR)
Noterdaeme, P. (FR)Celkový počet autorů 5 Zdroj.dok. Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711
Roč. 481, č. 3 (2018), s. 3921-3934Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova abundance database ; galaxies ; metallicity ; absorption ; kinematics ; telescope ; bias ; catalogues ; surveys ; intergalactic medium ; quasars: absorption lines ; early Universe UT WOS 000450984100077 EID SCOPUS 85054199831 DOI 10.1093/mnras/sty2374 Anotace The bias factor of damped Ly alpha (DLAs) systems, derived from the cross-correlation with the Ly alpha forest in absorption spectra of the Baryon Oscillation Spectroscopic Survey of SDSS-III, has been used to infer the characteristic mass of DLA host haloes. So far, no dependence of this bias factor with hydrogen column density N-HI or other parameters has been detected. With the aim of measuring the dependence of the bias factor on the strength of metal lines, we define the metal strength parameter S, based on optimally combining equivalent widths of 17 metal lines to obtain the highest possible signal-to-noise ratio of S for individual candidate DLAs (defined as having N-HI >= 10(20) cm(-2)). We present the distribution of metal strength for these DLAs and the dependence of its mean value on N-HI and redshift. We search for systematic effects and variations in the catalogue purity by examining the dependence of the S distribution on the spectral signal-to-noise and the estimated error on S. A catalogue of DLAs with measured equivalent widths for the selected 17 metal lines and the value of S are made publicly available, which are used in a separate paper to measure the dependence of the DLA bias factor on the S parameter. The relation of the metal strength on the gas metal abundances and velocity dispersion is complicated by the saturation of metal lines, and remains to be determined in future work. Pracoviště Ústav informatiky Kontakt Tereza Šírová, sirova@cs.cas.cz, Tel.: 266 053 800 Rok sběru 2022
Počet záznamů: 1