University of Hertfordshire

From the same journal

From the same journal

By the same authors

New Galactic star clusters discovered in the disc area of the VVVX survey

Research output: Contribution to journalArticle

Documents

  • sty2354

    Final published version, 15 MB, PDF document

  • J. Borissova
  • V. D. Ivanov
  • P. W. Lucas
  • R. Kurtev
  • J. Alonso-Garcia
  • S. Ramirez Alegria
  • D. Minniti
  • M. Hempel
  • N. Medina
  • A. N. Chene
  • M. A. Kuhn
View graph of relations
Original languageEnglish
Number of pages19
Pages (from-to)3902–3920
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date11 Dec 2018
Volume481
Issue3
Early online date30 Aug 2018
DOIs
Publication statusPublished - 11 Dec 2018

Abstract

The "VISTA Variables in the Via Lactea eXtended (VVVX)" ESO Public Survey is a near-infrared photometric sky survey that covers nearly 1700 sq. deg towards the Galactic disk and bulge. It is well-suited to search for new open clusters, hidden behind dust and gas. The pipeline processed and calibrated Ks-band tile images of 40% of the disk area covered by VVVX was visually inspected for stellar over-densities. Then, we identified cluster candidates by examination of the composite JHKs color images. The color-magnitude diagrams of the cluster candidates are constructed. Whenever possible the Gaia DR2 parameters are used to calculate the mean proper motions, radial velocities, reddening and distances. We report the discovery of 120 new infrared clusters and stellar groups. Approximately, half of them (47%) are faint, compact, highly reddened, and they seem to be associated with other indicators of recent star formation, such as nearby Young Stellar Objects, Masers, H II regions or bubbles. The preliminary distance determinations allow us to trace the clusters up to 4.5 kpc, but most of the cluster candidates are centered at 2.2 kpc. The mean proper motions of the clusters, show that in general, they follow the disk motion of the Galaxy.

Notes

© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

ID: 15670851