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arxiv 2103.05849 v1 pith:JRHFWQPK submitted 2021-03-10 astro-ph.GA astro-ph.SR

Assessing the stellar population and the environment of an HII region on the far side of the Galaxy

classification astro-ph.GA astro-ph.SR
keywords maserregionstellarassociatedclusteremissiongroupmid-infrared
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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