Spectroscopic Identification of NVSS J201019-252358 (Fermi J2007-2518) as a Blazar
ATel #6555; J. Strader (Michigan State University), L. Chomiuk (Michigan State University / National Radio Astronomy Observatory), M. Landoni (INAF, Brera Observatory), M. Ajello (Clemson University), C. C. Cheung (Naval Research Laboratory)
on 8 Oct 2014; 15:41 UT
Credential Certification: Teddy Cheung (ccheung@milkyway.gsfc.nasa.gov)
Subjects: Radio, Optical, Gamma Ray, AGN, Blazar
The X-ray detected radio source NVSS J201019-252358 was found within the LAT localization of the recently reported flaring gamma-ray source Fermi J2007-2518 (ATel #6553). Following its previous lower significance LAT detection in April 2014, we obtained a spectrum of the optical counterpart of NVSS J201019-252358 with the Goodman High Throughput Spectrograph on the SOAR 4.1m telescope on August 2, 2014, with wavelength coverage of ~ 3500-7000 Angstrom. A bright broad emission line is clearly detected which we associate with Mg II (lambda 2800) at a redshift, z=0.825. This identifies NVSS J201019-252358 as a flat-spectrum radio quasar and confirms the blazar nature of the flaring gamma-ray source as suggested in ATel #6553.
