RoboPol: first season rotations of optical polarization plane in blazars
Abstract
Here, we present first results on polarization swings in optical emission of blazars obtained by RoboPol, a monitoring programme of an unbiased sample of gamma-ray bright blazars specially designed for effective detection of such events. A possible connection of polarization swing events with periods of high activity in gamma-rays is investigated using the data set obtained during the first season of operation. It was found that the brightest gamma-ray flares tend to be located closer in time to rotation events, which may be an indication of two separate mechanisms responsible for the rotations. Blazars with detected rotations during non-rotating periods have significantly larger amplitude and faster variations of polarization angle than blazars without rotations. Our simulations show that the full set of observed rotations is not a likely outcome (probability ≤1.5 × 10-2) of a random walk of the polarization vector simulated by a multicell model. Furthermore, it is highly unlikely (~5 × 10-5) that none of our rotations is physically connected with an increase in gamma-ray activity.
- Authors:
-
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- Univ. of Crete, Heraklion (Greece). Inst. for Plasma Physics, Dept. of Physics; St. Petersburg State Univ., St. Petersburg (Russia). Astronomical Inst.
- Univ. of Crete, Heraklion (Greece). Inst. for Plasma Physics, Dept. of Physics; Foundation for Research and Technology (Forth), Heraklion (Greece). Inst. of Electronic Structure and Laser (IESL)
- Max Planck Inst. for Radio Astronomy, Bonn (Germany)
- Univ. of Crete, Heraklion (Greece). Inst. for Plasma Physics, Dept. of Physics
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astronomy and Astrophysics
- Max Planck Inst. for Radio Astronomy, Bonn (Germany)
- Inter-Univ. Centre for Astronomy and Astrophysics, Ganeshkhind (India)
- Nicolaus Copernicus Univ., Torun (Poland). Centre for Astronomy
- Aalto Univ., Metsahovi, (Finland). Metsahovi Radio Observatory
- Foundation for Research and Technology (Forth), Heraklion (Greece). Inst. of Electronic Structure and Laser (IESL); Univ. of Crete, Heraklion (Greece). Inst. for Plasma Physics, Dept. of Physics
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE; National Aeronautics and Space Administration (NASA); European Commission (EC); National Science Foundation (NSF); Polish National Science Centre (NCN)
- OSTI Identifier:
- 1354926
- Grant/Contract Number:
- AC02-76SF00515; NNX11A043G; AST-1109911; NNX14AQ07H; 2011/01/B/ST9/04618; PCIG-GA-2011-293531
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 453; Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; polarization, galaxies: active, galaxies: jets, galaxies: nuclei
Citation Formats
Blinov, D., Pavlidou, V., Papadakis, I., Kiehlmann, S., Panopoulou, G., Liodakis, I., King, O. G., Angelakis, E., Baloković, M., Das, H., Feiler, R., Fuhrmann, L., Hovatta, T., Khodade, P., Kus, A., Kylafis, N., Mahabal, A., Myserlis, I., Modi, D., Pazderska, B., Pazderski, E., Papamastorakis, I., Pearson, T. J., Rajarshi, C., Ramaprakash, A., Reig, P., Readhead, A. C. S., Tassis, K., and Zensus, J. A. RoboPol: first season rotations of optical polarization plane in blazars. United States: N. p., 2015.
Web. doi:10.1093/mnras/stv1723.
Blinov, D., Pavlidou, V., Papadakis, I., Kiehlmann, S., Panopoulou, G., Liodakis, I., King, O. G., Angelakis, E., Baloković, M., Das, H., Feiler, R., Fuhrmann, L., Hovatta, T., Khodade, P., Kus, A., Kylafis, N., Mahabal, A., Myserlis, I., Modi, D., Pazderska, B., Pazderski, E., Papamastorakis, I., Pearson, T. J., Rajarshi, C., Ramaprakash, A., Reig, P., Readhead, A. C. S., Tassis, K., & Zensus, J. A. RoboPol: first season rotations of optical polarization plane in blazars. United States. https://doi.org/10.1093/mnras/stv1723
Blinov, D., Pavlidou, V., Papadakis, I., Kiehlmann, S., Panopoulou, G., Liodakis, I., King, O. G., Angelakis, E., Baloković, M., Das, H., Feiler, R., Fuhrmann, L., Hovatta, T., Khodade, P., Kus, A., Kylafis, N., Mahabal, A., Myserlis, I., Modi, D., Pazderska, B., Pazderski, E., Papamastorakis, I., Pearson, T. J., Rajarshi, C., Ramaprakash, A., Reig, P., Readhead, A. C. S., Tassis, K., and Zensus, J. A. Wed .
"RoboPol: first season rotations of optical polarization plane in blazars". United States. https://doi.org/10.1093/mnras/stv1723. https://www.osti.gov/servlets/purl/1354926.
@article{osti_1354926,
title = {RoboPol: first season rotations of optical polarization plane in blazars},
author = {Blinov, D. and Pavlidou, V. and Papadakis, I. and Kiehlmann, S. and Panopoulou, G. and Liodakis, I. and King, O. G. and Angelakis, E. and Baloković, M. and Das, H. and Feiler, R. and Fuhrmann, L. and Hovatta, T. and Khodade, P. and Kus, A. and Kylafis, N. and Mahabal, A. and Myserlis, I. and Modi, D. and Pazderska, B. and Pazderski, E. and Papamastorakis, I. and Pearson, T. J. and Rajarshi, C. and Ramaprakash, A. and Reig, P. and Readhead, A. C. S. and Tassis, K. and Zensus, J. A.},
abstractNote = {Here, we present first results on polarization swings in optical emission of blazars obtained by RoboPol, a monitoring programme of an unbiased sample of gamma-ray bright blazars specially designed for effective detection of such events. A possible connection of polarization swing events with periods of high activity in gamma-rays is investigated using the data set obtained during the first season of operation. It was found that the brightest gamma-ray flares tend to be located closer in time to rotation events, which may be an indication of two separate mechanisms responsible for the rotations. Blazars with detected rotations during non-rotating periods have significantly larger amplitude and faster variations of polarization angle than blazars without rotations. Our simulations show that the full set of observed rotations is not a likely outcome (probability ≤1.5 × 10-2) of a random walk of the polarization vector simulated by a multicell model. Furthermore, it is highly unlikely (~5 × 10-5) that none of our rotations is physically connected with an increase in gamma-ray activity.},
doi = {10.1093/mnras/stv1723},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 453,
place = {United States},
year = {Wed Aug 26 00:00:00 EDT 2015},
month = {Wed Aug 26 00:00:00 EDT 2015}
}
Web of Science
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