Galaxy evolution explorer ultraviolet photometry of globular clusters in M31

Soo Chang Rey, R. Michael Rich, Young Wook Lee, Suk Jin Yoon, Sukyoung K. Yi, Luciana Bianchi, Young Jong Sohn, Peter G. Friedman, Tom A. Barlow, Yong Ik Byun, Jose Donas, Karl Forster, Timothy M. Heckman, Myungkook J. Jee, Patrick N. Jelinsky, Suk Whan Kim, Jae Woo Lee, Barry F. Madore, Roger F. Malina, D. Christopher MartinBruno Milliard, Patrick Morrissey, Susan G. Neff, Jaehyon Rhee, David Schiminovich, Oswald H.W. Siegmund, Todd Small, Alex S. Szalay, Barry Y. Welsh, Ted K. Wyder

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Abstract

We present ultraviolet photometry for globular clusters (GCs) in M31 from 15 deg2 of imaging using the Galaxy Evolution Explorer (GALEX). We detect 200 and 94 GCs with certainty in the near-ultraviolet (NUV; 1750-2750 A) and far-ultraviolet (FUV; 1350-1750 Å) bandpasses, respectively. Our rate of detection is about 50% in the NUV and 23% in the FUV, to an approximate limiting V magnitude of 19. Out of six clusters with [Fe/H] > -1 seen in the NUV, none is detected in the FUV bandpass. Furthermore, we find no candidate metal-rich clusters with significant FUV flux because of the contribution of blue horizontal-branch (HB) stars, such as NGC 6388 and NGC 6441, which are metal-rich Galactic GCs with hot HB stars. We show that our GALEX photometry follows the general color trends established in previous UV studies of GCs in M31 and the Galaxy. Comparing our data with Galactic GCs in the UV and with population synthesis models, we suggest that the age ranges of M31 and Galactic halo GCs are similar.

Original languageEnglish
Pages (from-to)L119-L122
JournalAstrophysical Journal
Volume619
Issue number1 II
DOIs
Publication statusPublished - 2005 Jan 20

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Rey, S. C., Rich, R. M., Lee, Y. W., Yoon, S. J., Yi, S. K., Bianchi, L., Sohn, Y. J., Friedman, P. G., Barlow, T. A., Byun, Y. I., Donas, J., Forster, K., Heckman, T. M., Jee, M. J., Jelinsky, P. N., Kim, S. W., Lee, J. W., Madore, B. F., Malina, R. F., ... Wyder, T. K. (2005). Galaxy evolution explorer ultraviolet photometry of globular clusters in M31. Astrophysical Journal, 619(1 II), L119-L122. https://doi.org/10.1086/422412