The redshift and the host galaxy of the neutrino candidate 4FGL J0955.1+3551 (3HSP J095507.9+355101). (16th April 2020)

• Record Type: Journal Article
• Authors: Paiano, Simona; Falomo, Renato; Padovani, Paolo; Giommi, Paolo; Gargiulo, Adriana; Uslenghi, Michela; Rossi, Andrea; Treves, Aldo
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 495:Number 1(2020)
• Page Start: L108
• Page End: L111
• Publication Date: 2020-04-16
• Subjects: neutrinos -- galaxies: active -- BL Lacertae objects: general -- BL Lacertae objects: individual: 4FGL J0955.1+3551 -- gamma-rays: galaxies; Astronomy -- Research -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnrasl/slaa056
• Languages: English
• ISSNs: 1745-3933

Abstract

ABSTRACT: The BL Lac object 4FGL J0955.1+3551 has been suggested as a possible source of ultra-energetic neutrinos detected by the IceCube observatory. The target was observed in 2020 January at the Large Binocular Telescope. Our spectroscopy (4100–8500 Å) yields a firm redshift z = 0.557 as deduced by the absorption lines of the host galaxy. The upper limit of the minimum equivalent width on emission lines is ∼0.3 Å. From the source image, we are able to resolve the host galaxy for which we measure an absolute magnitude M ( R ) = −22.9 and Re = 8 kpc, which are values which are typical of the host galaxies of BL Lacs.