The extended disc and halo of the Andromeda galaxy observed with Spitzer-IRAC

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1093/mnras/stw652
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Name affiliation
  1. National Research Council of Canada. National Science Infrastructure
FormatText, Article
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
1365-2966
Volume459
Issue2
Pages1403–1414
SubjectIndividual galaxies; M31; spiral galaxies; stellar content; infrared galaxies
Abstract
We present the first results from an extended survey of the Andromeda galaxy (M31) using 41.1 h of observations by Spitzer-IRAC at 3.6 and 4.5 µm. This survey extends previous observations to the outer disc and halo, covering total lengths of 4°.4 and 6°.6 along the minor and major axes, respectively. We have produced surface brightness profiles by combining the integrated light from background-corrected maps with stellar counts from a new catalogue of point sources. Using auxiliary catalogues, we have carried out a statistical analysis in colour–magnitude space to discriminate M31 objects from foreground Milky Way stars and background galaxies. The catalogue includes 426 529 sources, of which 66 per cent have been assigned probability values to identify M31 objects with magnitude depths of [3.6] = 19.0 ± 0.2, [4.5] = 18.7 ± 0.2. We discuss applications of our data for constraining the stellar mass and characterizing point sources in the outer radii.
Publication date
PublisherOxford University Press
LanguageEnglish
Peer reviewedYes
NPARC number23000382
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