University of Hertfordshire

From the same journal

From the same journal

By the same authors

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

Research output: Contribution to journalArticlepeer-review


  • A. -N. Chené
  • R. A. Benjamin
  • S. Ramírez Alegría
  • J. Borissova
  • R. Kurtev
  • C. Moni Bidin
  • F. Mauro
  • P. Lucas
  • Z. Guo
  • L. C. Smith
  • C. Gonzalez-Fernandez
  • V. D. Ivanov
  • D. Minniti
  • L. D. Anderson
  • W. P. Armentrout
  • D. Gonzalez
  • A. Herrero
  • K. Peña Ramírez
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Original languageEnglish
Article number91
Number of pages8
JournalThe Astrophysical Journal
Publication statusPublished - 20 Apr 2021


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.


© 2021. The American Astronomical Society. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at

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