| Issue |
A&A
Volume 531, July 2011
|
|
|---|---|---|
| Article Number | A38 | |
| Number of page(s) | 4 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/201016009 | |
| Published online | 07 June 2011 | |
Research Note
Polarization and photometric observations of the gamma-ray blazar PG 1553+113⋆
1
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La
Plata,
Paseo del Bosque, 1900,
FWA La Plata,
Argentina
e-mail: andru@fcaglp.unlp.edu.ar
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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