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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ultraviolet photometry
globular clusters
galaxies
metal
horizontal branch stars
blue stars
hot stars
galactic halos
metal clusters
photometry
halos
trends
color
synthesis

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Rey, Soo Chang ; Rich, R. Michael ; Lee, Young Wook ; Yoon, Suk Jin ; Yi, Sukyoung K. ; Bianchi, Luciana ; Sohn, Young Jong ; Friedman, Peter G. ; Barlow, Tom A. ; Byun, Yong Ik ; Donas, Jose ; Forster, Karl ; Heckman, Timothy M. ; Jee, Myungkook J. ; Jelinsky, Patrick N. ; Kim, Suk Whan ; Lee, Jae Woo ; Madore, Barry F. ; Malina, Roger F. ; Martin, D. Christopher ; Milliard, Bruno ; Morrissey, Patrick ; Neff, Susan G. ; Rhee, Jaehyon ; Schiminovich, David ; Siegmund, Oswald H.W. ; Small, Todd ; Szalay, Alex S. ; Welsh, Barry Y. ; Wyder, Ted K. / Galaxy evolution explorer ultraviolet photometry of globular clusters in M31. In: Astrophysical Journal. 2005 ; Vol. 619, No. 1 II. pp. L119-L122.
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title = "Galaxy evolution explorer ultraviolet photometry of globular clusters in M31",
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 {\AA}) 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.",
author = "Rey, {Soo Chang} and Rich, {R. Michael} and Lee, {Young Wook} and Yoon, {Suk Jin} and Yi, {Sukyoung K.} and Luciana Bianchi and Sohn, {Young Jong} and Friedman, {Peter G.} and Barlow, {Tom A.} and Byun, {Yong Ik} and Jose Donas and Karl Forster and Heckman, {Timothy M.} and Jee, {Myungkook J.} and Jelinsky, {Patrick N.} and Kim, {Suk Whan} and Lee, {Jae Woo} and Madore, {Barry F.} and Malina, {Roger F.} and Martin, {D. Christopher} and Bruno Milliard and Patrick Morrissey and Neff, {Susan G.} and Jaehyon Rhee and David Schiminovich and Siegmund, {Oswald H.W.} and Todd Small and Szalay, {Alex S.} and Welsh, {Barry Y.} and Wyder, {Ted K.}",
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Rey, SC, Rich, RM, Lee, YW, Yoon, SJ, Yi, SK, Bianchi, L, Sohn, YJ, Friedman, PG, Barlow, TA, Byun, YI, Donas, J, Forster, K, Heckman, TM, Jee, MJ, Jelinsky, PN, Kim, SW, Lee, JW, Madore, BF, Malina, RF, Martin, DC, Milliard, B, Morrissey, P, Neff, SG, Rhee, J, Schiminovich, D, Siegmund, OHW, Small, T, Szalay, AS, Welsh, BY & Wyder, TK 2005, 'Galaxy evolution explorer ultraviolet photometry of globular clusters in M31', Astrophysical Journal, vol. 619, no. 1 II, pp. L119-L122. https://doi.org/10.1086/422412

Galaxy evolution explorer ultraviolet photometry of globular clusters in M31. / Rey, Soo Chang; Rich, R. Michael; Lee, Young Wook; Yoon, Suk Jin; Yi, Sukyoung K.; Bianchi, Luciana; Sohn, Young Jong; Friedman, Peter G.; Barlow, Tom A.; Byun, Yong Ik; Donas, Jose; Forster, Karl; Heckman, Timothy M.; Jee, Myungkook J.; Jelinsky, Patrick N.; Kim, Suk Whan; Lee, Jae Woo; Madore, Barry F.; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Morrissey, Patrick; Neff, Susan G.; Rhee, Jaehyon; Schiminovich, David; Siegmund, Oswald H.W.; Small, Todd; Szalay, Alex S.; Welsh, Barry Y.; Wyder, Ted K.

In: Astrophysical Journal, Vol. 619, No. 1 II, 20.01.2005, p. L119-L122.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Galaxy evolution explorer ultraviolet photometry of globular clusters in M31

AU - Rey, Soo Chang

AU - Rich, R. Michael

AU - Lee, Young Wook

AU - Yoon, Suk Jin

AU - Yi, Sukyoung K.

AU - Bianchi, Luciana

AU - Sohn, Young Jong

AU - Friedman, Peter G.

AU - Barlow, Tom A.

AU - Byun, Yong Ik

AU - Donas, Jose

AU - Forster, Karl

AU - Heckman, Timothy M.

AU - Jee, Myungkook J.

AU - Jelinsky, Patrick N.

AU - Kim, Suk Whan

AU - Lee, Jae Woo

AU - Madore, Barry F.

AU - Malina, Roger F.

AU - Martin, D. Christopher

AU - Milliard, Bruno

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Rhee, Jaehyon

AU - Schiminovich, David

AU - Siegmund, Oswald H.W.

AU - Small, Todd

AU - Szalay, Alex S.

AU - Welsh, Barry Y.

AU - Wyder, Ted K.

PY - 2005/1/20

Y1 - 2005/1/20

N2 - 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.

AB - 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.

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U2 - 10.1086/422412

DO - 10.1086/422412

M3 - Article

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VL - 619

SP - L119-L122

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 II

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