TY - JOUR
T1 - Identifying the 3FHL Catalog. II. Results of the KOSMOS Optical Spectroscopy Campaign
AU - Marchesi, S.
AU - Kaur, A.
AU - Ajello, M.
N1 - Funding Information:
We acknowledge funding under NASA contract 80NSSC17K0503. We thank Amy Robertson, David Summers and Doug Williams for the help provided during the observing nights, and Marco Landoni for the useful comments on the data reduction and analysis process.
Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved.
PY - 2018/11
Y1 - 2018/11
N2 - We present the results of the optical spectroscopy follow up of a sample of 28 unclassified blazars from the Third Fermi-LAT Catalog of High-Energy Sources (3FHL). All the spectra were taken with the 4 m Mayall telescope at Kitt Peak. With this follow-up program, we are able to classify 27 out of 28 objects as BL Lacs, while the remaining one is a flat spectrum radio quasar. We determine a redshift (z) for three of these objects and a lower limit on z for other four sources: the farthest object for which we obtain a redshift has z > 0.836. These results are part of a more extended campaign of optical spectroscopy follow up of 3FHL blazars, aimed to obtain a complete sample of blazars at >10 GeV, which will then be used to extend our knowledge on blazar emission mechanisms and on the extragalactic background light.
AB - We present the results of the optical spectroscopy follow up of a sample of 28 unclassified blazars from the Third Fermi-LAT Catalog of High-Energy Sources (3FHL). All the spectra were taken with the 4 m Mayall telescope at Kitt Peak. With this follow-up program, we are able to classify 27 out of 28 objects as BL Lacs, while the remaining one is a flat spectrum radio quasar. We determine a redshift (z) for three of these objects and a lower limit on z for other four sources: the farthest object for which we obtain a redshift has z > 0.836. These results are part of a more extended campaign of optical spectroscopy follow up of 3FHL blazars, aimed to obtain a complete sample of blazars at >10 GeV, which will then be used to extend our knowledge on blazar emission mechanisms and on the extragalactic background light.
UR - http://www.scopus.com/inward/record.url?scp=85056701862&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85056701862&partnerID=8YFLogxK
U2 - 10.3847/1538-3881/aae201
DO - 10.3847/1538-3881/aae201
M3 - Article
AN - SCOPUS:85056701862
VL - 156
JO - Astronomical Journal
JF - Astronomical Journal
SN - 0004-6256
IS - 5
M1 - 212
ER -