تقرير
An Accurate Distance to High-Velocity Cloud Complex C
| العنوان: | An Accurate Distance to High-Velocity Cloud Complex C |
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| المؤلفون: | Thom, C., Peek, J. E. G., Putman, M. E., Heiles, Carl, Peek, K. M. G., Wilhelm, R. |
| سنة النشر: | 2007 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | We report an accurate distance of d = 10+/-2.5kpc to the high-velocity cloud Complex C. Using high signal-to-noise Keck/HIRES spectra of two horizontal-branch stars, we have detected CaII K absorption lines from the cloud. Significant non-detections toward a further 3 stars yield robust lower distance limits. The resulting HI mass of Complex C is 4.9^{+2.8}_{-2.2} x 10^6 Msun; a total mass of 8.2^{+4.6}_{-2.6} x 10^6 Msun is implied, after corrections for helium and ionization. At 10kpc, Complex C has physical dimensions 3x15 kpc, and if it is as thick as it is wide, then the average density is log Comment: Resubmitted to ApJ. 8 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1086/589960 |
| URL الوصول: | http://arxiv.org/abs/0712.0612 |
| رقم الأكسشن: | edsarx.0712.0612 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1086/589960 |
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