The Redshift of the BL Lac Object TXS 0506+056

被引：135

作者：

Paiano, Simona ^{[1
,2
]}

Falomo, Renato ^{[1
]}

Treves, Aldo ^{[3
,4
]}

Scarpa, Riccardo ^{[5
,6
]}

机构：

[1] INAF, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[2] Ist Nazl Fis Nucl, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy

[3] Univ Insubria, Via Valleggio 11, I-22100 Como, Italy

[4] INAF, Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, Italy

[5] Inst Astrofis Canarias, C-O Via Lactea S-N, E-38205 Tenerife, Spain

[6] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 854卷 / 02期

关键词：

BL Lacertae objects: individual (TXS 0506+056); galaxies: distances and redshifts; gamma rays: galaxies; neutrinos; LACERTAE OBJECTS; EMISSION;

D O I：

10.3847/2041-8213/aaad5e

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The bright BL Lac object TXS 0506+056 is the most likely counterpart of the IceCube neutrino event EHE 170922A. The lack of this redshift prevents a comprehensive understanding of the modeling of the source. We present high signal-to-noise optical spectroscopy, in the range 4100-9000 angstrom, obtained at the 10.4 m Gran Telescopio Canarias. The spectrum is characterized by a power-law continuum and is marked by faint interstellar features. In the regions unaffected by these features, we found three very weak (EW similar to 0.1 angstrom) emission lines that we identify with [O II] 3727 angstrom, [O III] 5007 angstrom, and [N II] 6583 angstrom, yielding the redshift z = 0.3365 +/- 0.0010.

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