Assessing the stellar population and the environment of an HII region on the far side of the Galaxy
| Autor: | Valentin D. Ivanov, Phil Lucas, L. D. Anderson, Zhen Guo, Robert A. Benjamin, André-Nicolas Chené, Danilo Gonzalez, Christian Moni Bidin, Sebastian Ramírez-Alegría, Leigh C. Smith, Karla Peña Ramírez, Artemio Herrero, Jura Borissova, Radostin Kurtev, W. P. Armentrout, Carlos González-Fernández, F. Mauro, Dante Minniti |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Stellar population Astronomy FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Far side of the Moon Astrophysics - Astrophysics of Galaxies Galaxy Star cluster Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics |
| ISSN: | 7591-2228 |
| Popis: | We have investigated the stellar and interstellar content of the distant star formation region IRAS 17591-2228 (WISE HII region GAL 007.47+0.06). It is associated to a water maser, whose parallax distance is d=20.4^{+2.8} {-2.2} kpc, supported by independent measurements of proper motion and radial velocity. It is projected in the same direction as an extremely red (J-Ks ~ 6 mag) group of stars, and a shell of mid-infrared emission. We qualify the group of stars as a cluster candidate, VVV CL177. Its radius spans between 0.45' and 1' and contains at least two young stellar objects with an extreme extinction near Av ~ 40 mag. Yet more analysis will be required to determine is it is a real single cluster associated with the water maser. The 13CO emissions at the radial velocity of the maser corresponds to the mid-infrared emission. 10 pages, 5 figures, accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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