Assessing the Stellar Population and the Environment of an HII Region on the Far Side of the Galaxy

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2021

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American Astronomical Society (Aas)

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Facultad de Ciencias

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Instituto de Fisica y Astronomia

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Resumen

We have investigated the stellar and interstellar content of the distant star formation region IRAS 17591-2228 (WISE H ii region GAL 007.47+0.06). It is associated with a water maser, whose parallax distance is $d={20.4}_{-2.2}^{+2.8}$ 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 0farcm45 and 1' and contains at least two young stellar objects with an extreme extinction near ${A}_{{\rm{V}}}\sim 40$ mag. Yet more analysis will be required to determine if 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.

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Palabras clave

STAR CLUSTERS, OPEN STAR CLUSTERS, YOUNG MASSIVE CLUSTERS, YOUNG STELLAR OBJECTS

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© 2021. The American Astronomical Society. All rights reserved.

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