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Optical spectroscopic characterization of Fermi blazar candidates of uncertain type with TNG and DOT: first results.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Nov2022, Vol. 516 Issue 4, p5702-5711. 10p. - Publication Year :
- 2022
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 516
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 159622449
- Full Text :
- https://doi.org/10.1093/mnras/stac2640