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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/30988
Title: High-energy gamma-ray sources in the VVV survey - I. The blazars
Authors: Pichel, Ana
Donoso, Laura G.
Baravalle, Laura D.
Alonso, M. Victoria
Rovero, Adrián C.
Beamín, Juan C.
Minniti, Dante
Cabral, Juan B.
Sánchez, Bruno
Coldwell, Georgina
MASETTI, NICOLA 
Issue Date: 2020
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 491
Issue: 3
First Page: 3448
Abstract: There is a lack of blazar detections in the galactic plane area, even in the most recent blazar catalogues, mainly due to incompleteness resulting from interstellar dust and stellar contamination of our Galaxy. The VISTA Variables in the Vía Láctea survey (VVV) aims to map variable sources towards the galactic plane in the near-infrared (IR). There are three catalogued and one candidate blazars in the VVV area, which are also detected by Fermi-LAT in the gamma-ray band and by the Wide-field Infrared Survey Explorer (WISE) at mid-IR wavelengths. We study the physical properties of these blazars in order to use them as a reference that would allow us to find counterparts of other unidentified gamma-ray sources in the future. All four sources have VVV counterparts, and two of them, 5BZUJ1731-3003 and 5BZQJ1802-3940 are also associated with WISE sources. They present very different properties compared with stellar or extragalactic objects. Their VVV K<SUB>s</SUB> light curves show significant variability, and are characterized using a machine learning analysis. In particular, the blazar 5BZQJ1802-3940, a flat spectrum radio quasar, exhibits the smallest uncertainties in the Fermi-LAT position and it is a bright WISE source. Its near-IR properties in the colour-magnitude and colour-colour diagrams are very different from the stars and extragalactic objects in the field. It has the highest amplitude in the K<SUB>s</SUB> differential light curve and fractional variability amplitude. This pilot study will allow us to search for and identify other blazars hidden behind the Galactic plane using the VVV survey data base....
URI: http://hdl.handle.net/20.500.12386/30988
URL: https://academic.oup.com/mnras/article/491/3/3448/5643933
ISSN: 0035-8711
DOI: 10.1093/mnras/stz3239
Bibcode ADS: 2020MNRAS.492.4847L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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