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Redshift of the Fermi Flaring Blazar PMN J2331-2148

ATEL # 2206; J. P. Halpern, A. P. S. Crotts (Columbia U.)
on 20 Sep 2009; 18:20 UT
Password Certification: Jules Halpern (

Subjects: Optical, Gamma Ray, >GeV, AGN, Quasars

Longo et al. (ATel #2101) reported a Fermi LAT detection of flaring from the flat-spectrum radio source PMN J2331-2148, of unknown redshift, on 2009 June 26. The optical counterpart of PMN J2331-2148 is visible on the Digitized Sky Survey with position from the USNO B1.0 catalog RA = 23h31m04.03s, Decl.=-21d48'15.3" (J2000.0). We obtained six 10 minute spectra using the Boller & Chivens CCD Spectrograph on the 2.4m Hiltner Telescope of the MDM Observatory on 2009 September 18, covering the wavelength range 3860-7530 Angstroms. Emission lines of the Balmer series and Mg II 2795,2802 are detected at z=0.563+/-0.002, superposed on a blue continuum. Based on the -18 Angstroms equivalent width of of Mg II, we classify PMN J2331-2148 as a flat-spectrum radio quasar.

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