RT Journal Article
T1 Optical spectroscopic characterization of Fermi blazar candidates of uncertain type with TNG and DOT: first results
A1 Olmo García, Amanda
A1 Paliya, Vaidehi S.
A1 Álvarez Crespo, Nuria
A1 Kumar, Brajesh
A1 Domínguez Díaz, Alberto
A1 Gil De Paz, Armando
A1 Sánchez Blázquez, Patricia
AB 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 </=10^(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-alfa absorption feature in one source. The spectra of the remaining 16 objetcts, on the other hand, are found to be featureless.
PB Oxford University Press.
SN 0035-8711
YR 2022
FD 2022-09-30
LK https://hdl.handle.net/20.500.14352/72720
UL https://hdl.handle.net/20.500.14352/72720
LA eng
NO © 2021 The Authors.  We are grateful to the journal referee for constructive criticism. Part of the data presented herein was obtained at the Devasthal Optical Telescope (DOT), which is operated by Aryabhatta Research Institute of Observational Sciences (ARIES). We thank the staff of ARIES who made these observations possible. Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated by the Fundación Galileo Galilei (FGG) of the Istituto Nazionale di Astrofisica (INAF) at the Observatorio del Roque de los Muchachos (La Palma, Canary Islands, Spain). We thank the TNG telescope staff for the observations done in service mode. A.O.G. acknowledges financial support from the Spanish Ministry of Science, Innovation and Universities (MCIUN) under grant numbers RTI2018-096188-B-I00, and from the Comunidad de Madrid Tec2Space project S2018/NMT4291. A.D. acknowledges the support of the Ramón y Cajal program from the Spanish MINECO. P.S-B acknowledges financial support from the Spanish Ministry of Science, Innovation and Universities (MCIUN) under grant number PID2019-107427GB-C31.
NO Ministerio de Ciencia e Innovación (MICINN)
NO Ministerio de Economía y Competitividad (MINECO)
NO Comunidad de Madrid
DS Docta Complutense
RD 18 abr 2025