SCYON Abstract

Received on June 25 2007

Wide-Field Survey of Globular Clusters in M31. I. A Catalog of New Clusters

AuthorsSang Chul Kim (1), Myung Gyoon Lee (2), Doug Geisler (3), Ata Sarajedini (4), Hong Soo Park (2), Ho Seong Hwang (2), William E. Harris (5), Juan C. Seguel (3,6), and Ted von Hippel (7,8)
Affiliation(1) Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea
(2) Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea
(3) Grupo de Astronomia, Departamento de Fisica, Universidad de Concepcion, Casilla 160-C, Concepcion, Chile
(4) Department of Astronomy, University of Florida, Gainesville, FL 32611, USA
(5) Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
(6) Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
(7) Department of Astronomy, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712, USA
(8) Visiting Scientist, Southwest Research Institute, 1050 Walnut Street, Suite 400, Boulder, CO 80302, USA
To appear in2007 August, AJ, 134, 706
Contactsckim@kasi.re.kr
URLhttp://xxx.lanl.gov/abs/0706.2904
Links

Abstract

We present the result of a wide-field survey of globular clusters (GCs) in M31 covering a 3deg x 3deg field centered on M31. We have searched for GCs on CCD images taken with Washington CMT1 filters at the KPNO 0.9 m telescope using the following steps: (1) inspection of morphological parameters given by the SExtractor package such as stellarity, full width at half-maximum, and ellipticity; (2) consulting the spectral types and radial velocities obtained from spectra taken with the Hydra spectrograph at the WIYN 3.5 m telescope; and (3) visual inspection of the images of each object. We have found 1164 GCs and GC candidates, of which 605 are newly found GCs and GC candidates and 559 are previously known GCs. Among the new objects there are 113 genuine GCs, 258 probable GCs, and 234 possible GCs, according to our classification criteria. Among the known objects there are 383 genuine GCs, 109 probable GCs, and 67 possible GCs. In total there are 496 genuine GCs, 367 probable GCs and 301 possible GCs. Most of these newly found GCs have T1 magnitudes of 17.5 - 19.5 mag, [17.9 < V < 19.9 mag assuming (C-T1) ~ 1.5], and (C-T1) colors in the range 1 - 2.