University of Hertfordshire

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By the same authors

VVV-WIT-04: an extragalactic variable source caught by the VVV Survey

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Documents

  • Roberto K. Saito
  • Dante Minniti
  • Valentin D. Ivanov
  • Nicola Masetti
  • Maria Gabriela Navarro
  • Roberto Cid Fernandes
  • Daniel Ruschel-Dutra
  • Leigh C. Smith
  • Philip W. Lucas
  • Carlos Gonzalez-Fernandez
  • Rodrigo Contreras Ramos
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Original languageEnglish
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society,
Journal publication date20 Sep 2019
Early online date20 Sep 2019
DOIs
Publication statusE-pub ahead of print - 20 Sep 2019

Abstract

We report the discovery of VVV-WIT-04, a near-infrared variable source towards the Galactic disk located ~0.2 arcsec apart from the position of the radio source PMN J1515-5559. The object was found serendipitously in the near-IR data of the ESO public survey VISTA Variables in the V\'ia L\'actea (VVV). Our analysis is based on variability, multicolor, and proper motion data from VVV and VVV eXtended surveys, complemented with archive data at longer wavelengths. We suggest that VVV-WIT-04 has an extragalactic origin as the near-IR counterpart of PMN J1515-5559. The Ks-band light-curve of VVV-WIT-04 is highly variable and consistent with that of an Optically Violent Variable (OVV) quasar. The variability in the near-IR can be interpreted as the redshifted optical variability. Residuals to the proper motion varies with the magnitude suggesting contamination by a blended source. Alternative scenarios, including a transient event such as a nova or supernova, or even a binary microlensing event are not in agreement with the available data.

Notes

8 pages, 5 figures. Accepted for publication in MNRAS

ID: 17397117