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

André Nicolas Chené, Robert A. Benjamin, Sebastian Ramírez-Alegría, Jura Borissova, Radostin Kurtev, Christian Moni Bidin, Francesco Mauro, Phil Lucas, Zhen Guo, Leigh C. Smith, Carlos Gonzalez-Fernandez, Valentin D. Ivanov, Dante Minniti, Loren D. Anderson, William P. Armentrout, Danilo Gonzalez, Artemio Herrero, Karla Peña Ramírez

Research output: Contribution to journalArticlepeer-review


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-+2.22.8 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 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 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.

Original languageEnglish
Article number91
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 20 Apr 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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