The selection function of the LAMOST Spectroscopic Survey of the Galactic Anticentre

Abstract

We present a detailed analysis of the selection function of the LAMOST Spectroscopic Survey of the Galactic Anti-centre (LSS-GAC). LSS-GAC was designed to obtain low resolution optical spectra for a sample of more than 3 million stars in the Galactic anti-centre. The second release of value-added catalogues of the LSS-GAC (LSS-GAC DR2) contains stellar parameters, including radial velocity, atmospheric parameters, elemental abundances and absolute magnitudes deduced from 1.8 million spectra of 1.4 million unique stars targeted by the LSS-GAC between 2011 and 2014. For many studies using this database, such as those investigating the chemodynamical structure of the Milky Way, a detailed understanding of the selection function of the survey is indispensable. In this paper, we describe how the selection function of the LSS-GAC can be evaluated to sufficient detail and provide selection function corrections for all spectroscopic measurements with reliable parameters released in LSS-GAC DR2. The results, to be released as new entries in the LSS-GAC value-added catalogues, can be used to correct the selection effects of the catalogue for scientific studies of various purposes.

arXiv comment13 pages, 12 figures, accepted for publication in MNRAS

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• Overview of the LAMOST survey in the first decade
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• Stellar mass distribution and star formation history of the Galactic disk revealed by mono-age stellar populations from LAMOST
• Mapping the Galactic disk with the LAMOST and Gaia Red clump sample: I: precise distances, masses, ages and 3D velocities of $\sim$ 140000 red clump stars
• Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample VII: the Stellar Disk Structure Revealed by the Mono-abundance Populations
• Chemical Cartography. II. The Assembly History of the Galactic Stellar Halo Traced by Carbon-Enhanced Metal-Poor Stars
• Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys
• Correction to the photometric colors of the Gaia Data Release 2 with the stellar color regression method
• Chemically peculiar A and F stars with enhanced s-process and iron-peak elements: stellar radiative acceleration at work
• Selection functions of large spectroscopic surveys
• Insights into the Formation and Evolution History of the Galactic Disk System
• seestar: Selection functions for spectroscopic surveys of the Milky Way
• Rediscovering the Milky Way with orbit superposition approach and APOGEE data I. Method validation
• A selection function toolbox for subsets of astronomical catalogues