文章基本信息

标题：The Magellan Evolution of Galaxies Spectroscopic and Ultraviolet Reference Atlas (MegaSaura). I. The Sample and the Spectra
本地全文：下载
作者：J. R. Rigby ; M. B. Bayliss ; K. Sharon 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：155
期号：3
页码：1-16
DOI：10.3847/1538-3881/aaa2ff
语种：English
出版社：American Institute of Physics
摘要：We introduce Project MEGaSaURA: the Magellan Evolution of Galaxies Spectroscopic and Ultraviolet ReferenceAtlas. MEGaSaURA comprises medium-resolution, rest-frame ultraviolet spectroscopy of N=15 brightgravitationally lensed galaxies at redshifts of 1.68<z<3.6, obtained with the MagE spectrograph on the Magellan telescopes. The spectra cover the observed-frame wavelength range 3200<λo<8280 Å; the average spectral resolving power is R=3300. The median spectrum has a signal-to-noise ratio (S/N)=21 per resolution element at 5000 Å. As such, the MEGaSaURA spectra have superior S/N and wavelength coverage compared to what COS/HST provides for starburst galaxies in the local universe. This paper describes the sample, the observations, and the data reduction. We compare the measured redshifts for the stars, the ionized gas as traced by nebular lines, and the neutral gas as traced by absorption lines; we find the expected bulk outflow of the neutral gas, and no systemic offset between the redshifts measured from nebular lines and the redshifts measured from the stellar continuum. We provide the MEGaSaURA spectra to the astronomical community through a data release.
关键词：atlases;galaxies: evolution;galaxies: high-redshift;gravitational lensing: strong