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Optical spectroscopic characterization of Fermi blazar candidates of uncertain type with TNG and DOT: first results

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dc.contributor.author Olmo-Garc´ıa, Amanda, et.al.
dc.contributor.author Kumar, Brajesh
dc.date.accessioned 2024-05-02T06:25:30Z
dc.date.available 2024-05-02T06:25:30Z
dc.date.issued 2022-11
dc.identifier.uri https://doi.org/10.1093/mnras/stac2640
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1549
dc.description.abstract The classification of γ -ray-detected blazar candidates of uncertain type (BCU) is a relevant problem in extragalactic γ -ray astronomy. Here, we report the optical spectroscopic characterization, using two 3–4 m class telescopes, Telescopio Nazionale Galileo and Devasthal Optical Telescope, of 27 BCUs detected with the Fermi Large Area Telescope. Since the identification of emission lines is easier in broad-line blazars, which usually exhibit low frequency peaked (synchrotron peak frequency ≤1014 Hz) spectral energy distribution, we primarily target such BCUs. We found that 8 out of 27 sources exhibit broad emission lines in their optical spectra, 3 of them have redshifts >1 and the farthest one is at z = 2.55. The optical spectra of 2 of the 19 remaining objects are dominated by the absorption spectra of the host galaxy, and there is a tentative detection of the Lyman-α absorption feature in one source. The spectra of the remaining 16 objects, on the other hand, are found to be featureless. en_US
dc.language.iso en en_US
dc.publisher Monthly Notices of the Royal Astronomical Society en_US
dc.relation.ispartofseries 1914;mn516-5702
dc.subject galaxies: active en_US
dc.subject BL Lacertae objects: general en_US
dc.subject gamma-ray: galaxies en_US
dc.title Optical spectroscopic characterization of Fermi blazar candidates of uncertain type with TNG and DOT: first results en_US
dc.type Article en_US


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