Mills, E. and Morris, M. R. and Lang, C. C. and Dong, H. and Wang, Q. D. and Cotera, A. and Stolovy, S. R. (2011) Properties of the Compact H II Region Complex G-0.02-0.07. Astrophysical Journal, 735 (2). Art. No. 84. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110712-152534675
- Published Version
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20110712-152534675
We present new extinction maps and high-resolution Paschen-alpha images of G-0.02-0.07, a complex of compact H II regions located adjacent to the M-0.02-0.07 giant molecular cloud, 6 pc in projection from the center of the Galaxy. These H II regions, which lie in projection just outside the boundary of the Sgr A East supernova remnant, represent one of the most recent episodes of star formation in the central parsecs of the Galaxy. The 1.87 μm extinctions of regions A, B, and C are almost identical, approximately 3.7 mag. Region D, in contrast, has a peak extinction of A_(1.87) = 5.9 mag. Adopting an extinction law specific to the Galactic center, we find that these extinctions correspond to visual extinctions of A V = 45 and A V = 71. The similar and uniform extinctions of regions A, B, and C are consistent with that expected for foreground extinction in the direction of the Galactic center, suggesting that they lie at the front side of the M-0.02-0.07 molecular cloud. Region D is more compact, has a higher extinction, and is thus suspected to be younger and embedded in a dense core in a compressed ridge on the western edge of this cloud.
|Additional Information:||© 2011 American Astronomical Society. Received 2011 February 8; accepted 2011 April 21; published 2011 June 20. We thank the anonymous referee of this paper for detailed and insightful comments, which improved this paper. We also thank R. Karlsson for sharing the results of his OH analysis with us before publication. Support for program HST-GO-11120 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. This material is based upon work supported by the National Science Foundation under grant no. 0907934.|
|Subject Keywords:||dust, extinction; Galaxy: center; Hii regions|
|Classification Code:||PACS: 98.38.Hv; 98.35.Jk; 98.38.Dq; 98.38.Mz; 95.85.Hp|
|Official Citation:||Properties of the Compact H II Region Complex G-0.02-0.07 E. Mills et al. 2011 ApJ 735 84|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||13 Jul 2011 18:27|
|Last Modified:||26 Dec 2012 13:23|
Repository Staff Only: item control page