A new near-IR window of low extinction in the Galactic plane

Dante Minniti, Roberto K. Saito, Oscar A. Gonzalez, Javier Alonso-García, Marina Rejkuba, Rodolfo Barbá, Mike Irwin, Roberto Kammers, Phillip W. Lucas, Daniel Majaess, Elena Valenti

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Aims. The windows of low extinction in the Milky Way (MW) plane are rare but important because they enable us to place structural constraints on the opposite side of the Galaxy, which has hither to been done rarely. Methods. We use the near-infrared (near-IR) images of the VISTA Variables in the Vía Láctea (VVV) Survey to build extinction maps and to identify low extinction windows towards the Southern Galactic plane. Here we report the discovery of VVV WIN 1713-3939, a very interesting window with relatively uniform and low extinction conveniently placed very close to the Galactic plane. Results. The new window of roughly 30 arcmin diameter is located at Galactic coordinates (l, b) = (347.4, -0.4) deg. We analyse the VVV near-IR colour-magnitude diagrams in this window. The mean total near-IR extinction and reddening values measured for this window are AKs = 0.46 and E(J - Ks) = 0.95. The red clump giants within the window show a bimodal magnitude distribution in the Ks band, with peaks at Ks = 14.1 and 14.8 mag, corresponding to mean distances of D = 11.0 ± 2.4 and 14.8 ± 3.6 kpc, respectively. We discuss the origin of these red clump overdensities within the context of the MW disk structure.

Original languageEnglish
Article numberA26
JournalAstronomy and Astrophysics
Volume616
DOIs
Publication statusPublished - 7 Aug 2018

Keywords

  • Dust, extinction
  • Galaxy: Disk
  • Galaxy: Structure
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'A new near-IR window of low extinction in the Galactic plane'. Together they form a unique fingerprint.

Cite this