The redshift of the BL Lac object TXS 0506+056

Abstract

The bright BL Lac object TXS 0506+056 is a 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 $\text{A˚}$, obtained at the 10.4m 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 $\sim$ 0.1 $\text{A˚}$) emission lines that we identify with [O II] 3727 $\text{A˚}$, [O III] 5007 $\text{A˚}$, and [N II] 6583 $\text{A˚}$, yielding the redshift z = 0.3365$\pm$0.0010.

7 pages, 3 figures, 2 tables; accepted for publication in ApJL

References in corpus (1)

• On the redshift of TeV BL Lac objects

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