EDP Sciences
Free access
Volume 416, Number 3, March IV 2004
Page(s) 917 - 924
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20035632

A&A 416, 917-924 (2004)
DOI: 10.1051/0004-6361:20035632

2MASS NIR photometry for 693 candidate globular clusters in M 31 and the Revised Bologna Catalogue

S. Galleti1, 2, L. Federici1, M. Bellazzini1, F. Fusi Pecci1 and S. Macrina2

1  INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
2  Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
    e-mail: [luciana;bellazzini;flavio]@bo.astro.it

(Received 5 November 2003 / Accepted 2 December 2003)

We have identified in the 2MASS database 693 known and candidate globular clusters in M 31. The 2MASS JHK magnitudes of these objects have been transformed to the same homogeneous photometric system of existing near infrared photometry of M 31 globulars, finally yielding JHK integrated photometry for 279 confirmed M 31 clusters, 406 unconfirmed candidates and 8 objects with controversial classification. Of these objects 529 lacked any previous estimate of their near infrared magnitudes. The newly assembled near infrared dataset has been implemented into a revised version of the Bologna Catalogue of M 31 globulars, with updated optical ( UBVRI) photometry taken, when possible, from the most recent sources of CCD photometry available in the literature and transformed to a common photometric system. The final Revised Bologna Catalogue (available in electronic form) is the most comprehensive list presently available of confirmed and candidate M 31 globular clusters, with a total of 1164 entries. In particular, it includes 337 confirmed GCs, 688 GC candidates, 10 objects with controversial classification, 70 confirmed galaxies, 55 confirmed stars, and 4 H II regions lying within ~ $3\degr$ from the center of the M 31 galaxy. Using the newly assembled database we show that the V-K color provides a powerful tool to discriminate between M 31 clusters and background galaxies, and we identify a sample of 83 globular cluster candidates, which is not likely to be contaminated by misclassified galaxies.

Key words: galaxies: individual: M 31 -- galaxies: star clusters -- infrared: general -- catalogs

Offprint request: S. Galleti, galleti@bo.astro.it

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