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Search for AGN counterparts of unidentified Fermi -LAT sources with optical polarimetry: demonstration of the technique

Mandarakas N., Blinov Dmitry A., Liodakis Ioannis, Kouroumpatzakis K., Zezas, Andreas, Panopoulou Georgia V., Myserlis, Ioannis 1988-, Angelakis, Emmanouil 1971-, Hovatta Talvikki, Kiehlmann, Sebastian, Kokolakis Konstantinos, Paleologou, Efthimios, 1953-, Pouliasi A., Skalidis Raphael, Pavlidou Vassiliki

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URIhttp://purl.tuc.gr/dl/dias/FAF35655-4BFC-44E5-862A-C62C676E716C-
Identifierhttps://doi.org/10.1051/0004-6361/201834458-
Identifierhttps://www.aanda.org/articles/aa/abs/2019/03/aa34458-18/aa34458-18.html-
Languageen-
Extent8 pagesen
TitleSearch for AGN counterparts of unidentified Fermi -LAT sources with optical polarimetry: demonstration of the techniqueen
CreatorMandarakas N.en
CreatorBlinov Dmitry A.en
CreatorLiodakis Ioannisen
CreatorKouroumpatzakis K.en
CreatorZezas, Andreasen
CreatorPanopoulou Georgia V.en
CreatorMyserlis, Ioannis 1988-en
CreatorAngelakis, Emmanouil 1971-en
CreatorHovatta Talvikkien
CreatorKiehlmann, Sebastianen
CreatorKokolakis Konstantinosen
CreatorΚοκολακης Κωνσταντινοςel
CreatorPaleologou, Efthimios, 1953-en
CreatorPouliasi A.en
CreatorSkalidis Raphaelen
CreatorPavlidou Vassilikien
PublisherEDP Sciencesen
Content SummaryContext. The third Fermi-LAT catalog (3FGL) presented the data of the first four years of observations from the Fermi Gamma-ray Space Telescope mission. There are 3034 sources, 1010 of which still remain unidentified. Identifying and classifying γ-ray emitters is of high significance with regard to studying high-energy astrophysics. Aims. We demonstrate that optical polarimetry can be an advantageous and practical tool in the hunt for counterparts of the unidentified γ-ray sources (UGSs). Methods. Using data from the RoboPol project, we validated that a significant fraction of active galactic nuclei (AGN) associated with 3FGL sources can be identified due to their high optical polarization exceeding that of the field stars. We performed an optical polarimetric survey within 3σ uncertainties of four unidentified 3FGL sources. Results. We discovered a previously unknown extragalactic object within the positional uncertainty of 3FGL J0221.2+2518. We obtained its spectrum and measured a redshift of z = 0.0609 ± 0.0004. Using these measurements and archival data we demonstrate that this source is a candidate counterpart for 3FGL J0221.2+2518 and most probably is a composite object: a star-forming galaxy accompanied by AGN. Conclusions. We conclude that polarimetry can be a powerful asset in the search for AGN candidate counterparts for unidentified Fermi sources. Future extensive polarimetric surveys at high Galactic latitudes (e.g., PASIPHAE) will allow the association of a significant fraction of currently unidentified γ-ray sources.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2020-07-27-
Date of Publication2019-
SubjectGalaxies: activeen
SubjectGamma rays: galaxiesen
SubjectTechniques: polarimetricen
Bibliographic CitationN. Mandarakas, D. Blinov, I. Liodakis, K. Kouroumpatzakis, A. Zezas, G.V. Panopoulou, I. Myserlis, E. Angelakis, T. Hovatta, S. Kiehlmann, K. Kokolakis, E. Paleologou, A. Pouliasi, R. Skalidis and V. Pavlidou, "Search for AGN counterparts of unidentified Fermi -LAT sources with optical polarimetry: demonstration of the technique," Astron. Astrophys., vol. 623, Mar. 2019. doi: 10.1051/0004-6361/201834458en

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