Bright emission lines in the optical spectrum and the redshift of the host galaxy of TDE candidate SRGet J143359.25+400638.5
ATel #13500; R. Burenin (IKI), M. Eselevich (ISZF SO RAN), I. Zaznobin (IKI), S. Sazonov (IKI), R. Sunyaev (IKI), on behalf of the Russian SRG/eROSITA Consortium
on 18 Feb 2020; 18:37 UT
Credential Certification: Ildar Khabibullin (khabibullin@iki.rssi.ru)
Subjects: Optical, Transient, Tidal Disruption Event
The host galaxy, SDSS J143359.16+400636, of the bright SRG/eROSITA X-ray TDE candidate SRGet J143359.25+400638.5 (I. Khabibullin et al., ATel #13494) was observed on Feb 18, 2020, at 4:50-6:10 UT with the Sayan observatory's AZT-33IK 1.6-m telescope using the ADAM low and medium resolution spectrograph.
The derived low-resolution spectrum shows a continuum with CaII, MgI and NaD absorption lines typical of an early-type galaxy, and also [OIII],4959,5007 and Halpha in emission. All the absorption and emission lines are narrow (<200 km/s) and observed at redshift z=0.0986. The equivalent widths of the [OIII],5007 and Halpha lines are 5.4 and 6.4 angstrom respectively, corresponding to a luminosity ~10^40 erg/s.
We also obtained direct images in g,r,i, with 15 min exposure per filter. The images show no obvious difference as compared to the SDSS ones.
