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

TL;DR

This paper reports a comprehensive wide-field survey of globular clusters in M31, resulting in a catalog that includes 605 newly identified GCs and candidates, utilizing imaging, spectral data, and visual inspection.

Contribution

It provides the first extensive catalog of new globular clusters in M31, combining multiple observational techniques for identification and classification.

Findings

Identified 605 new GCs and candidates in M31.

Classified GCs into genuine, probable, and possible categories.

Most new GCs have magnitudes between 17.5 and 19.5, with specific color ranges.

Abstract

We present the result of a wide-field survey of globular clusters (GCs) in M31 covering a 3deg x 3deg field c. We have searched for GCs on CCD images taken with Washington CMT1 filters at the KPNO 0.9 m telescope using steps: (1) inspection of morphological parameters given by the SExtractor package such as stellarity, full maximum, and ellipticity; (2) consulting the spectral types and radial velocities obtained from spectra takena spectrograph at the WIYN 3.5 m telescope; and (3) visual inspection of the images of each object. We have and GC candidates, of which 605 are newly found GCs and GC candidates and 559 are previously known GCs. Amoects there are 113 genuine GCs, 258 probable GCs, and 234 possible GCs, according to our classification critee known objects there are 383 genuine GCs, 109 probable GCs, and 67 possible GCs. In total there are 496 genprobable 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.