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Title:
Discovery of a New Low-Latitude Milky Way Globular Cluster Using GLIMPSE
Authors:
Kobulnicky, Henry A.; Monson, A. J.; Buckalew, B. A.; Darnel, J. M.; Uzpen, B.; Meade, M. R.; Babler, B. L.; Indebetouw, R.; Whitney, B. A.; Watson, C.; Churchwell, E.; Wolfire, M. G.; Wolff, M. J.; Clemens, D. P.; Shah, R.; Bania, T. M.; Benjamin, R. A.; Cohen, M.; Dickey, J. M.; Jackson, J. M.; Marston, A. P.; Mathis, J. S.; Mercer, E. P.; Stauffer, J. R.; Stolovy, S. R.; Norris, J. P.; Kutyrev, A.; Canterna, R.; Pierce, M. J.
Affiliation:
AA(Department of Physics and Astronomy, University of Wyoming, P.O. Box 3905, Laramie, WY 82072.), AB(Department of Physics and Astronomy, University of Wyoming, P.O. Box 3905, Laramie, WY 82072.), AC(Department of Physics and Astronomy, University of Wyoming, P.O. Box 3905, Laramie, WY 82072.), AD(Department of Physics and Astronomy, University of Wyoming, P.O. Box 3905, Laramie, WY 82072.), AE(Department of Physics and Astronomy, University of Wyoming, P.O. Box 3905, Laramie, WY 82072.), AF(Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706.), AG(Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706.), AH(Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706.), AI(Space Science Institute, Suite 205, 4750 Walnut Street, Boulder, CO 80301.), AJ(Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706.), AK(Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706.), AL(Department of Astronomy, University of Maryland, College Park, MD 20742-2421.), AM(Space Science Institute, Suite 205, 4750 Walnut Street, Boulder, CO 80301.), AN(Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215.), AO(Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215.), AP(Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215.), AQ(Department of Physics, University of Wisconsin-Whitewater, 800 West Main Street, Whitewater, WI 53190.), AR(Radio Astronomy Laboratory, 601 Campbell Hall, University of California, Berkeley, CA 94720.), AS(Department of Astronomy, University of Minnesota, 116 Church Street, SE, Minneapolis, MN 55455.), AT(Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215.), AU(ESTEC/SCI-SA, Postbus 299, NL-2200 AG Noordwijk, Netherlands.), AV(Department of Astronomy, University of Maryland, College Park, MD 20742-2421.), AW(Department of Physics, University of Wisconsin-Whitewater, 800 West Main Street, Whitewater, WI 53190.), AX(Spitzer Science Center, Mail Stop 314-6, California Institute of Technology, Pasadena, CA 91125.), AY(Spitzer Science Center, Mail Stop 314-6, California Institute of Technology, Pasadena, CA 91125.), AZ(NASA Goddard Space Flight Center, LHEA, Code 661, Greenbelt, MD 20771.), BA(NASA Goddard Space Flight Center, SSAI, Code 685, Greenbelt, MD 20771.), BB(Department of Physics and Astronomy, University of Wyoming, P.O. Box 3905, Laramie, WY 82072.), BC(Department of Physics and Astronomy, University of Wyoming, P.O. Box 3905, Laramie, WY 82072.)
Publication:
The Astronomical Journal, Volume 129, Issue 1, pp. 239-250. (AJ Homepage)
Publication Date:
01/2005
Origin:
UCP
AJ Keywords:
Galaxies: Structure, Galaxy: Stellar Content, Galaxy: Globular Clusters: General, Infrared: Galaxies
DOI:
10.1086/426337
Bibliographic Code:
2005AJ....129..239K

Abstract

Spitzer Space Telescope imaging from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) reveals a previously unidentified low-latitude rich star cluster near l=31.3d, b=-0.1d. Near-infrared JHK' photometry from the Wyoming Infrared Observatory indicates an extinction of AV~=15+/-3 mag for cluster members. Analysis of 13CO features along the same sight line suggests a probable kinematic distance of 3.1-5.2 kpc. The new cluster has an angular diameter of ~1-2 pc, a total magnitude corrected for extinction of mK0=2.1, and a luminosity of MK~=-10.3 at 3.1 kpc. In contrast to young massive Galactic clusters with ages less than 100 Myr, the new cluster has no significant radio emission. Comparison with theoretical K-band luminosity functions indicates an age of at least several gigayears and a mass of at least 105 Msolar. Unlike known old open clusters, this new cluster lies in the inner Galaxy at RGC~=6.1 kpc. We designate this object ``GLIMPSE-C01'' and present evidence that it is a Milky Way globular cluster passing through the Galactic disk. We also identify a region of star formation and fan-shaped outflows from young stellar objects in the same field as the cluster. The cluster's passage through the Galactic molecular layer may have triggered this star formation activity.
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