A brightening of (QSO) DR UMa

Details A brightening of (QSO) DR UMa A brightening of (QSO) DR UMa

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3352....1f&link_type=abstract

The Astronomer's Telegram, #3352

Other

Radio, Optical, Blazar, Cataclysmic Variable, Quasar

Scientific paper

The CRTS Transient (Drake et al. 2009, ApJ, 696, 870), ID CSS110402:135906+554432 has brightened in March - April 2011, it reached 17.14 mag in unfiltered images on 2011 Apr. 2.34 UT, in its normal state it is fainter than 19 mag ( http://nesssi.cacr.caltech.edu/catalina/20110402/1104021550454132704.html#table1). The object is associated with known variable star DR UMa, its SDSS magnitudes are u = 20.56, g = 20.39, r = 19.99, i = 19.98, z = 19.95, the SDSS coordinates are 13 59 05.74, 55 44 29.58 (2000). We have taken 15-min spectrum of DR UMa with the SCORPIO spectrograph of the 6-meter Russian telescope on 2011 Apr. 13.88 UT. Spectral resolution was 13 A, however the spectrum was subjected to a strong Moon background. We find DR UMa is a QSO with a redshift z = 1.01 based on a broad emission line at ~ 5630 A, which we identify with MgII 2798 A, its EW is 30 A. A comparison with SDSS QSO template spectra ( http://www.sdss.org/gallery/gal_zqso.html) reveals possible C III] 1908 A emission at our spectral range edge and other fainter emission lines. Strong absorption features at 4268, 5022/5045 and 5431 A may be MgII absorption lines arising in line of sight material.

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