2017/05/21 by Simona Paiano, Marco Landoni, Renato Falomo +2
Physics and Astronomy · #Absorption spectroscopy #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #BL Lac object #Extragalactic background light #Gamma-ray bursts and supernovae #Lyman limit #Red shift #Redshift #Spectral line #Spectroscopy #astro-ph.GA #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/aa7aac
10 pages, 2 figures, 4 tables; accepted for publication in ApJ
arxiv created 2017/05/21 · openalex created_date 2017/06/05 · openalex publication_date 2017/07/28 · arxiv updated 2017/08/09 · openalex updated_date 2026/08/05
Abstract We present optical spectra with high signal-to-noise ratio of 10 BL Lac objects detected at GeV energies by the Fermi satellite (3FGL catalog), which previous observations suggested are at relatively high redshift. The new observations, obtained at the 10 m Gran Telescopio Canarias, allowed us to find the redshift for J0814.5+2943 ( z = 0.703), and we can set a spectroscopic lower limit for J0008.0+4713 ( z > 1.659) and J1107.7+0222 ( z > 1.0735) on the basis of Mg ii intervening absorption features. In addition we confirm the redshifts for J0505.5+0416 ( z = 0.423) and J1450+5200 ( z > 2.470). Finally we contradict the previous z estimates for five objects (J0049.7+0237, J0243.5+7119, J0802.0+1005, J1109.4+2411, and J2116.1+3339).