ACS photometry of newly-discovered globular clusters in the outer halo of M31

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

13 pages, 3 figures, 1 table; accepted for publication in ApJ Letters

Scientific paper

10.1086/511977

We report the first results from deep ACS imaging of ten classical globular clusters in the far outer regions (15 < R_p < 100 kpc) of M31. Eight of the clusters, including two of the most remote M31 globular clusters presently known, are described for the first time. Our F606W, F814W colour-magnitude diagrams extend ~ 3 magnitudes below the horizontal branch and clearly demonstrate that the majority of these objects are old (> 10 Gyr), metal-poor clusters. Five have [Fe/H] ~ -2.1, while an additional four have -1.9 < [Fe/H] < -1.5. The remaining object is more metal-rich, with [Fe/H] ~ -0.70. Several clusters exhibit the second parameter effect. Using aperture photometry, we estimate integrated luminosities and structural parameters for all clusters. Many, including all four clusters with projected radii greater than 45 kpc, are compact and very luminous, with -8.9 < M_V < -8.3. These four outermost clusters are thus quite unlike their Milky Way counterparts, which are typically diffuse, sub-luminous (-6.0 < M_V < -4.7) and more metal-rich (-1.8 < [Fe/H] < -1.3).

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

ACS photometry of newly-discovered globular clusters in the outer halo of M31 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ACS photometry of newly-discovered globular clusters in the outer halo of M31, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ACS photometry of newly-discovered globular clusters in the outer halo of M31 will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-241221

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.