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Title: OPTICAL POLARIMETRY OF THE BLAZAR CGRaBS J0211+1051 FROM MOUNT ABU INFRARED OBSERVATORY

We report the detection of high polarization in the first detailed optical linear polarization measurements on the BL Lac object CGRaBS J0211+1051, which flared in {gamma}-rays on 2011 January 23 as reported by Fermi. The observations were made during 2011 January 30-February 3 using a photo-polarimeter mounted at the 1.2 m telescope of Mount Abu Infrared Observatory. CGRaBS J0211+1051 was detected to have a {approx}21.05% {+-} 0.41% degree of polarization (DP) with a steady position angle (P.A.) at 43 Degree-Sign on 2011 January 30. During January 31 and February 1, while polarization shows some variation, the P.A. remained steady through the night. Several polarization flashes occurred during February 2 and 3 resulting in changes in the DP by more than 4% at short timescales ({approx}17-45 minutes). The intra-night variability shown by the source appears to be related to the turbulence in the relativistic jet. A mild wavelength dependence of polarization is not ruled out during the nights of February 2 and 3. The source exhibited significant inter-night variations in the DP (changing by about 2%-9%) and P.A. (changing by 2 Degree-Sign -22 Degree-Sign ) during the five nights of observations. A sudden change in the P.A. accompanied by a risemore » in the DP could be indicative of the fresh injection of plasma in the jet. The detection of a high and variable DP suggests that the source is a low-energy peaked blazar.« less
Authors:
; ; ;  [1]
  1. Astronomy and Astrophysics Division, Physical Research Laboratory, Ahmedabad 380009 (India)
Publication Date:
OSTI Identifier:
22011774
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 746; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BL LACERTAE OBJECTS; FREQUENCY DEPENDENCE; GALAXIES; GALAXY NUCLEI; PLASMA; POLARIMETERS; POLARIMETRY; POLARIZATION; RELATIVISTIC RANGE; TELESCOPES; TURBULENCE