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Title:
A Young Super Star Cluster in the Nuclear Region of NGC 253
Authors:
Kornei, Katherine A.; McCrady, Nate
Affiliation:
AA(Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095 1547, USA ), AB(Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095 1547, USA)
Publication:
The Astrophysical Journal, Volume 697, Issue 2, pp. 1180-1186 (2009). (ApJ Homepage)
Publication Date:
06/2009
Origin:
IOP
ApJ Keywords:
galaxies: individual: NGC 253, galaxies: star clusters
DOI:
10.1088/0004-637X/697/2/1180
Bibliographic Code:
2009ApJ...697.1180K

Abstract

We present observations of a massive star cluster near the nuclear region of the nearby starburst galaxy NGC 253. The peak of near-infrared (IR) emission, which is spatially separated by 4'' from the kinematic center of the galaxy, is coincident with a super star cluster whose properties we examine with low-resolution (R ~ 1200) infrared Cerro Tololo Inter-American Observatory spectroscopy and optical/near-IR Hubble Space Telescope imaging. Extinction, measured from Fe II lines, is estimated at AV = 17.7 ± 2.6. The age of the cluster is estimated at 5.7 Myr, based on Brγ equivalent width for an instantaneous burst using Starburst99 modeling. However, a complex star formation history is inferred from the presence of both recombination emission and photospheric CO absorption. The ionizing photon flux has a lower limit of 7.3 ± 2.5 × 1053 s-1, corrected for extinction. Assuming a Kroupa initial mass function, we estimate a cluster mass of ~1.4+0.4 -0.5 × 107 M sun. We observe a strong Wolf-Rayet signature at 2.06 μm and report a weak feature at 2.19 μm which may be due to a massive stellar population, consistent with the derived mass and age of this cluster.
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