Star cluster candidates in M81

Julie B. Nantais, John P. Huchra, Brian McLeod, Jay Strader, Jean P. Brodie

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


We present a catalog of extended objects in the vicinity of M81 based on a set of 24 Hubble Space Telescope Advanced Camera for Surveys Wide Field Camera F814W (I-band) images. We have found 233 good globular cluster (GC) candidates; 92 candidate HII regions, OB associations, or diffuse open clusters; 489 probable background galaxies; and 1719 unclassified objects. We have color data from ground-based g- and r-band MMT Megacam images for 79 galaxies, 125 GC candidates, 7 HII regions, and 184 unclassified objects. The color-color diagram of GC candidates shows that most fall into the range 0.25 < g - r < 1.25 and 0.5 < r - I < 1.25, similar to the color range of Milky Way GCs. Unclassified objects are often blue, suggesting that many of them are likely to be HII regions and open clusters, although a few galaxies and GCs may be among them.

Original languageEnglish
Pages (from-to)1413-1425
Number of pages13
JournalAstronomical Journal
Issue number4
Publication statusPublished - 2010


  • Galaxies: spiral
  • Galaxies: star clusters: general
  • Galaxies: stellar content
  • Individual (M81)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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