1. Optical spectroscopic characterization of Fermi blazar candidates of uncertain type with TNG and DOT: First Results
- Author
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Olmo-GarcÍa, Amanda, Paliya, Vaidehi S., Crespo, Nuria Álvarez, Kumar, Brajesh, Domínguez, Alberto, de Paz, Armando Gil, and Sánchez-Blázquez, Patricia
- Subjects
Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Astrophysics of Galaxies - Abstract
The classification of gamma-ray-detected blazar candidates of uncertain type (BCU) is a relevant problem in extragalactic gamma-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 $\leqslant10^{14}$ 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-$\alpha$ absorption feature in one source. The spectra of the remaining 16 objects, on the other hand, are found to be featureless., Comment: MNRAS, in press
- Published
- 2022
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