分类： 天文学 >> 天文学 提交时间： 2023-02-19
Johan Comparat
Wentao Luo
Andrea Merloni
Surhud More
Mara Salvato
Mirko Krumpe
Takamitsu Miyaji
William Brandt
Antonis Georgakakis
Masayuki Akiyama
Johannes Buchner
Tom Dwelly
Toshihiro Kawaguchi
Teng Liu
Tohru Nagao
Kirpal Nandra
John Silverman
Yoshiki Toba
Scott F. Anderson
Juna Kollmeier
摘要： Which galaxies in the general population turn into active galactic nuclei
(AGN) is a keystone of galaxy formation and evolution. Thanks to SRG/eROSITA's
contiguous 140 square degrees pilot survey field, we constructed a large,
complete, and unbiased soft X-ray flux-limited AGN sample at low redshift
$0.05
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Marina Kounkel
Eleonora Zari
Kevin Covey
Andrew Tkachenko
Carlos Román Zúñiga
Keivan Stassun
Amelia M. Stutz
Guy Stringfellow
Alexandre Roman-Lopes
Jesús Hernández
Karla Peña Ramírez
Amelia Bayo
Jinyoung Serena Kim
Lyra Cao
Scott J. Wolk
Juna Kollmeier
Ricardo López-Valdivia
Bárbara Rojas-Ayala
摘要： The fifth iteration of the Sloan Digital Sky Survey (SDSS-V) is set to obtain optical and near-infrared spectra of $\sim$5 million stars of all ages and masses throughout the Milky Way. As a part of these efforts, APOGEE & BOSS Young Star Survey (ABYSS) will observe $\sim10^5$ stars with ages $<$30 Myr that have been selected using a set of homogeneous selection functions that make use of different tracers of youth. The ABYSS targeting strategy we describe in this paper is aimed to provide the largest spectroscopic census of young stars to-date. It consists of 8 different types of selection criteria that take the position on the HR diagram, infrared excess, variability, as well as the position in phase space in consideration. The resulting catalog of $\sim$200,000 sources (of which a half are expected to be observed) provides representative coverage of the young Galaxy, including both nearby diffuse associations as well as more distant massive complexes, reaching towards the inner Galaxy and the Galactic center.
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