VVV-WIT-04: An extragalactic variable source caught by the VVV Survey
Cargando...
Archivos
Fecha
2019-11
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Oxford University Press
Nombre de Curso
Licencia CC
Atribución 4.0 Internacional (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
We report the discovery of VVV-WIT-04, a near-infrared (near-IR) variable source towards the Galactic disc 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 Vía Láctea (VVV). Our analysis is based on variability, multicolour, 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 quasar. The variability in the near-IR can be interpreted as the redshifted optical variability. Residuals to the proper motion vary 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. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Notas
Indexación: Scopus
Palabras clave
Catalogues, Infrared, stars, Radio continuum, galaxies, Radio continuum, general, Stars, individual, VVV-WIT-04, Surveys
Citación
Monthly Notices of the Royal Astronomical Society Volume 490, Issue 1, Pages 1171 - 117821 November 2019
DOI
10.1093/mnras/stz2631