Volume 531, July 2011
|Number of page(s)||4|
|Published online||07 June 2011|
Polarization and photometric observations of the gamma-ray blazar PG 1553+113⋆
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La
Paseo del Bosque, 1900,
FWA La Plata,
2 IALP, CONICET-UNLP, CCT La Plata, Paseo del Bosque, 1900, FWA La Plata, Argentina
3 IAR, CONICET, CCT La Plata, C.C. No. 5 (1894) Villa Elisa, Buenos Aires, Argentina
4 Departamento de Física (EPS), Universidad de Jaén, Campus Las Lagunillas s/n, A3, 23071 Jaén, Spain
Received: 27 October 2010
Accepted: 2 May 2011
We present the results of an observational photo-polarimetry campaign of the blazar PG 1553+113 at optical wavelengths. The blazar was recently detected at very high energies (>100 GeV) by the HESS and MAGIC γ-ray Cherenkov telescopes. Our high-temporal resolution data show significant variations in the linear polarization percentage and position angle at inter-night time-scales, while at shorter (intra-night) time-scales both parameters varied less significantly, if at all. Changes in the polarization angle seem to be common in γ-ray emitting blazars. Simultaneous differential photometry (through the B and R bands) shows no significant variability in the total optical flux. We provide B and R magnitudes, along with a finding chart, for a set of field stars suitable for differential photometry.
Key words: BL Lacertae objects: individual: PG 1553+113 / polarization
© ESO, 2011
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