Spectroscopy of 10 γ -Ray BL Lac Objects at High Redshift

Journal Article · Tue Aug 01 00:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA7AAC· OSTI ID:22663330

Paiano, Simona; Falomo, Renato ^[1]; Landoni, Marco ^[2]; Treves, Aldo ^[3]; Scarpa, Riccardo ^[4]

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1. INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova (Italy)
2. INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (Italy)
3. Università degli Studi dell’Insubria, Via Valleggio 11, I-22100 Como (Italy)
4. Instituto de Astrofisica de Canarias, C/O Via Lactea, s/n E-38205 La Laguna, Tenerife (Spain)

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).

• OSTI ID: 22663330
• Journal Information: Astrophysical Journal, Vol. 844, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
BL LACERTAE OBJECTS
CATALOGS
COSMIC GAMMA SOURCES
GALAXIES
GAMMA RADIATION
GEV RANGE
NOISE
RED SHIFT
SATELLITES
SIGNAL-TO-NOISE RATIO
SPECTRA
SPECTROSCOPY