DOI QR코드

DOI QR Code

MONITORING OF GAMMA-RAY BRIGHT AGN: THE MULTI-FREQUENCY POLARIZATION OF THE FLARING BLAZAR 3C 279

  • KANG, SINCHEOL ;
  • LEE, SANG-SUNG ;
  • BYUN, DO-YOUNG
  • Received : 2015.09.15
  • Accepted : 2015.10.10
  • Published : 2015.10.31

Abstract

We present results of long-term multi-wavelength polarization observations of the powerful blazar 3C 279 after its γ-ray flare on 2013 December 20. We followed up this flare with single-dish polarization observations using two 21-m telescopes of the Korean VLBI Network. Observations carried out weekly from 2013 December 25 to 2015 January 11, at 22 GHz, 43 GHz, 86 GHz simultaneously, as part of the Monitoring Of GAmma-ray Bright AGN (MOGABA) program. We measured 3C 279 total flux densities of 22–34 Jy at 22 GHz, 15–28 Jy (43 GHz), and 10–21 Jy (86 GHz), showing mild variability of ≤ 50 % over the period of our observations. The spectral index between 22 GHz and 86 GHz ranged from −0.13 to −0.36. Linear polarization angles were 27°–38°, 30°–42°, and 33°–50° at 22 GHz, 43 GHz, and 86 GHz, respectively. The degree of linear polarization was in the range of 6–12 %, and slightly decreased with time at all frequencies. We investigated Faraday rotation and depolarization of the polarized emission at 22–86 GHz, and found Faraday rotation measures (RM) of −300 to −1200 rad m−2 between 22 GHz and 43 GHz, and −800 to −5100 rad m−2 between 43 GHz and 86 GHz. The RM values follow a power law with a mean power law index a of 2.2, implying that the polarized emission at these frequencies travels through a Faraday screen in or near the jet. We conclude that the regions emitting polarized radio emission may be different from the region responsible for the 2013 December γ-ray flare and are maintained by the dominant magnetic field perpendicular to the direction of the radio jet at milliarcsecond scales.

Keywords

galaxies: active;galaxies: jets;galaxies: magnetic fields;polarization;quasars: individual (3C 279)

References

  1. Tribble, P. C. 1991, Depolarization of Extended Radio Sources by a Foreground Faraday Screen, MNRAS, 250, 726 https://doi.org/10.1093/mnras/250.4.726
  2. Perley, R. A., & Butler, B. J. 2013, Integrated Polarization Properties of 3C48, 3C138, 3C147, and 3C286, ApJS, 206, 16 https://doi.org/10.1088/0067-0049/206/2/16
  3. Sasada, M., Uemura, M., Arai, A., et al. 2010, Multiband Photopolarimetric Monitoring of an Outburst of the Blazar 3C 454.3 in 2007, PASJ, 62, 645 https://doi.org/10.1093/pasj/62.3.645
  4. Sault, R. J., Hamaker, J. P., & Bregman, J. D. 1996, Understanding Radio Polarimetry. II. Instrumental Calibration of an Interferometer Array, A&AS, 117, 149
  5. Wehrle, A. E., Marscher, A. P., Jorstad, S. G., et al. 2012, Multiwavelength Variations of 3C 454.3 during the 2010 November to 2011 January Outburst, ApJ, 758, 72 https://doi.org/10.1088/0004-637X/758/2/72
  6. Lee, S.-S., Petrov, L., Byun, D.-Y., et al. 2014, Early Science with the Korean VLBI Network: Evaluation of System Performance, AJ, 147, 77 https://doi.org/10.1088/0004-6256/147/4/77
  7. Krolik, J. H. 1999, Active Galactic Nuclei : from the Central Black Hole to the Galactic Environment (Princeton: Princeton University Press)
  8. Lee, S.-S., Byun, D.-Y., Oh, C. S., et al. 2011, Single-Dish Performance of KVN 21-m Radio Telescopes: Simultaneous Observations at 22 and 43 GHz, PASP, 123, 1398 https://doi.org/10.1086/663326
  9. Lee, S.-S., Han, M., Kang, S., et al. 2013, Proceedings of The Innermost Regions of Relativistic Jets and Their Magnetic Fields (EPJ Web of Conferences), ed. J. L. Gomez, 61
  10. Lee, S.-S., Kang, S., Byun, D.-Y., et al. 2015, First Detection of 350 Micron Polarization from a Radio-Loud AGN, ApJ, 808, 26L https://doi.org/10.1088/2041-8205/808/1/L26
  11. Mascher, A., Jorstad, S., Larionov, V., et al. 2010, Probing the Inner Jet of the Quasar PKS 1510-089 with MultiWaveband Monitoring During Strong Gamma-Ray Activity, ApJ, 710, 126 https://doi.org/10.1088/2041-8205/710/2/L126
  12. Larionov, V. M., Jorstad, S. G., Marscher, A. P., et al. 2008, Results of WEBT, VLBA and RXTE Monitoring of 3C 279 during 2006-2007, A&A, 492, 389
  13. Mangum, J. G. 2000, User’s Manusal for the NRAO 12 Meter Millimeter-Wave Telescope, NRAO, 129
  14. Marscher, A. P., Jorstad, S. G., D’Arcangelo, F. D., et al. 2008, The Inner Jet of an Active Galactic Nucleus as Revealed by a Radio-to-γ-Ray Outburst, Nature, 452, 966 https://doi.org/10.1038/nature06895
  15. Orienti, M., Venturi, T., Dallacasa, D., et al. 2011, MultiEpoch Parsec-Scale Observations of the Blazar PKS 1510089, MNRAS, 417, 359 https://doi.org/10.1111/j.1365-2966.2011.19272.x
  16. Boettcher, M., Harris, D. E., & Krawczynski, H. 2012, Relativistic Jets from Active Galactic Nuclei (Berlin: Wiley)
  17. Burn, B. J. 1966, On the Depolarization of Discrete Radio Sources by Faraday Dispersion, MNRAS, 133, 67 https://doi.org/10.1093/mnras/133.1.67
  18. Chatterjee, R., Jorstad, S. G., Marscher, A. P., et al. 2008, Correlated Multi-Wave Band Variability in the Blazar 3C 279 from 1996 to 2007, ApJ, 689, 79 https://doi.org/10.1086/592598
  19. D’Ammando, F., Raiteri, C. M., Villata, M., et al. 2011, AGILE Detection of Extreme γ-Ray Activity from the Blazar PKS 1510-089 during March 2009, A&A, 529, 145
  20. Farnes, J. S., Gaensler, B. M., & Carretti, E. 2014, A Broadband Polarization Catalog of Extragalactic Radio Sources, ApJS, 212, 15 https://doi.org/10.1088/0067-0049/212/1/15
  21. Flett, A. M., & Henderson, C. 1979, Observations of the Polarized Emission of Taurus A, Cas A and Cygnus A at 9-mm Wavelength, MNRAS, 189, 867 https://doi.org/10.1093/mnras/189.4.867
  22. Krawczynski, H., Boettcher, M., & Reimer, A. 2012, Unresolved Emission from the Core: Observations and Models, Relativistic Jets from Active Galactic Nuclei (Berlin: Wiley), 218
  23. Hada, K., Kino, M., Nagai, H., et al. 2012, VLBI Observations of the Jet in M 87 during the Very High Energy γ-Ray Flare in 2010 April, ApJ, 760, 52H https://doi.org/10.1088/0004-637X/760/1/52
  24. Hayashida, M., Nalewajko, K.,Madejski, G. M., et al. 2015, Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, SWIFT, and Ground-Based Multi-Wavelength Observations, ApJ, 807, 79H https://doi.org/10.1088/0004-637X/807/1/79
  25. Jorstad, S. G., Marscher, A. P., Stevens, J. A., et al. 2007, Multiwaveband Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Correlated Polarization Behavior, AJ, 134, 799 https://doi.org/10.1086/519996
  26. Abdo, A. A., Ackermann, M., Ajello, M., et al. 2010, A Change in the Optical Polarization Associated with a γ-ray Flare in the Blazar 3C279, Nature, 463, 919 https://doi.org/10.1038/nature08841
  27. Aleksić, J., Ansoldi, S., Antonelli, L. A., et al. 2011, MAGIC Oservations and Multi-Frequency Properties of the Flat Spectrum Radio Quasar 3C 279 in 2011, A&A, 567, 41
  28. Aumont, J., Conversi, L., Thum, C., et al. 2010, Measurement of the Crab Nebula Polarization at 90 GHz as a Calibrator for CMB Experiments, A&A, 514, A70

Cited by

  1. INTERFEROMETRIC MONITORING OF GAMMA-RAY BRIGHT AGNs. I. THE RESULTS OF SINGLE-EPOCH MULTIFREQUENCY OBSERVATIONS vol.227, pp.1, 2016, https://doi.org/10.3847/0067-0049/227/1/8
  2. Detection of millimeter-wavelength intraday variability in polarized emission from S5 0716+714 vol.592, 2016, https://doi.org/10.1051/0004-6361/201629212
  3. LINEAR POLARIZATION OF CLASS I METHANOL MASERS IN MASSIVE STAR-FORMING REGIONS vol.227, pp.2, 2016, https://doi.org/10.3847/0067-0049/227/2/17
  4. Probing the gamma-ray variability in 3C 279 using broad-band observations vol.464, pp.1, 2017, https://doi.org/10.1093/mnras/stw2342
  5. Exploring the Connection between Parsec-scale Jet Activity and Broadband Outbursts in 3C 279 vol.858, pp.2, 2018, https://doi.org/10.3847/1538-4357/aab785

Acknowledgement

Grant : 우주탄생과 진화연구