A large group of asymptotic giant branch stars in the disk of M31: A missing piece of the puzzle?

Download
  1. Get@NRC: A large group of asymptotic giant branch stars in the disk of M31: A missing piece of the puzzle? (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1088/2041-8205/749/1/L7
AuthorSearch for:
TypeArticle
Journal titleThe Astrophysical Journal Letters
ISSN2041-8205
Volume749
Issue1
Article numberL7
AbstractWe examine the properties of a stellar grouping that is ∼3.5kpc to the northeast of the center of M31. This structure has (1) a surface brightness that is lower than the surrounding disk, (2) a more-or-less round appearance, (3) a size of ∼300 arcsec (∼1kpc), and (4) an integrated brightness K = 6.5. It is populated by stars with ages ≥100Myr and J - K colors that tend to be bluer than those of stars in the surrounding disk. Comparisons with model luminosity functions suggest that the star formation rate in this object has changed twice in the past few hundred Myr. Fitting a Sérsic function to the light profile reveals a power-law index and effective surface brightness that are similar to those of dwarf galaxies with the same integrated brightness. Two possible origins for this object are considered: (1) it is a heretofore undiscovered satellite of M31 that is seen against/in/through the M31 disk or (2) it is a fossil star-forming region in the M31 disk. © 2012. The American Astronomical Society. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269418
Export citationExport as RIS
Report a correctionReport a correction
Record identifierc372f741-772c-4a3e-842a-b95c59c55f30
Record created2013-12-12
Record modified2016-07-18
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)