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Parsec scale polarization properties of the TeV blazar Markarian 421. / Lico, R.; Giroletti, M.; Orienti, M.; Gómez, J. L.; Casadio, C.; D'Ammando, F.; Blasi, M. G.; Cotton, W.; Edwards, P. G.; Fuhrmann, L.; Jorstad, S.; Kino, M.; Kovalev, Y. Y.; Krichbaum, T. P.; Marscher, A. P.; Paneque, D.; Piner, B. G.; Sokolovsky, K. V.

In: Proceedings of Science, 2014.

Research output: Contribution to journal › Conference article › peer-review

Harvard

Lico, R, Giroletti, M, Orienti, M, Gómez, JL, Casadio, C, D'Ammando, F, Blasi, MG, Cotton, W, Edwards, PG, Fuhrmann, L, Jorstad, S, Kino, M, Kovalev, YY, Krichbaum, TP, Marscher, AP, Paneque, D, Piner, BG & Sokolovsky, KV 2014, 'Parsec scale polarization properties of the TeV blazar Markarian 421', Proceedings of Science.

APA

Lico, R., Giroletti, M., Orienti, M., Gómez, J. L., Casadio, C., D'Ammando, F., Blasi, M. G., Cotton, W., Edwards, P. G., Fuhrmann, L., Jorstad, S., Kino, M., Kovalev, Y. Y., Krichbaum, T. P., Marscher, A. P., Paneque, D., Piner, B. G., & Sokolovsky, K. V. (2014). Parsec scale polarization properties of the TeV blazar Markarian 421. Proceedings of Science, [025].

Vancouver

Lico R, Giroletti M, Orienti M, Gómez JL, Casadio C, D'Ammando F et al. Parsec scale polarization properties of the TeV blazar Markarian 421. Proceedings of Science. 2014. 025.

Author

Lico, R. ; Giroletti, M. ; Orienti, M. ; Gómez, J. L. ; Casadio, C. ; D'Ammando, F. ; Blasi, M. G. ; Cotton, W. ; Edwards, P. G. ; Fuhrmann, L. ; Jorstad, S. ; Kino, M. ; Kovalev, Y. Y. ; Krichbaum, T. P. ; Marscher, A. P. ; Paneque, D. ; Piner, B. G. ; Sokolovsky, K. V. / Parsec scale polarization properties of the TeV blazar Markarian 421. In: Proceedings of Science. 2014.

BibTeX

@article{a72239c9488d4e01877fd1633ef671c1,
title = "Parsec scale polarization properties of the TeV blazar Markarian 421",
abstract = "In this work we present a polarization analysis at radio frequencies of Markarian 421, one of the closest (z = 0.03) TeV blazars. The observations were obtained, both in total and in polarized intensity, with the Very Long Baseline Array (VLBA) at 15, 24, and 43 GHz throughout 2011, with one observation per month (for a total of twelve epochs). We investigate the magnetic field topology and the polarization structure on parsec scale and their evolution with time. We detect polarized emission both in the core and in the jet region, and it varies with frequency, location and time. In the core region we measure a mean fractional polarization of ∼ 1-2%, with a peak of about 4% in March at 43 GHz; the polarization angle is almost stable at 43 GHz, but it shows significant variability in the range 114° - 173° at 15 GHz. In the jet region the polarization properties show a more stable behavior; the fractional polarization is ∼ 16% and the polarization angle is nearly perpendicular to the jet axis. The higher EVPA variability observed at 15 GHz is due both to a variable Faraday rotation effect and to opacity. The residual variability observed in the intrinsic polarization angle, together with the low degree of polarization in the core region, could be explained with the presence of a blend of variable cross-polarized subcomponents within the beam.",
author = "R. Lico and M. Giroletti and M. Orienti and G{\'o}mez, {J. L.} and C. Casadio and F. D'Ammando and Blasi, {M. G.} and W. Cotton and Edwards, {P. G.} and L. Fuhrmann and S. Jorstad and M. Kino and Kovalev, {Y. Y.} and Krichbaum, {T. P.} and Marscher, {A. P.} and D. Paneque and Piner, {B. G.} and Sokolovsky, {K. V.}",
note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.; 12th European VLBI Network Symposium and Users Meeting, EVN 2014 ; Conference date: 07-10-2014 Through 10-10-2014",
year = "2014",
language = "English",
journal = "Proceedings of Science",
issn = "1824-8039",
publisher = "Sissa Medialab Srl",

}

RIS

TY - JOUR

T1 - Parsec scale polarization properties of the TeV blazar Markarian 421

AU - Lico, R.

AU - Giroletti, M.

AU - Orienti, M.

AU - Gómez, J. L.

AU - Casadio, C.

AU - D'Ammando, F.

AU - Blasi, M. G.

AU - Cotton, W.

AU - Edwards, P. G.

AU - Fuhrmann, L.

AU - Jorstad, S.

AU - Kino, M.

AU - Kovalev, Y. Y.

AU - Krichbaum, T. P.

AU - Marscher, A. P.

AU - Paneque, D.

AU - Piner, B. G.

AU - Sokolovsky, K. V.

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

PY - 2014

Y1 - 2014

N2 - In this work we present a polarization analysis at radio frequencies of Markarian 421, one of the closest (z = 0.03) TeV blazars. The observations were obtained, both in total and in polarized intensity, with the Very Long Baseline Array (VLBA) at 15, 24, and 43 GHz throughout 2011, with one observation per month (for a total of twelve epochs). We investigate the magnetic field topology and the polarization structure on parsec scale and their evolution with time. We detect polarized emission both in the core and in the jet region, and it varies with frequency, location and time. In the core region we measure a mean fractional polarization of ∼ 1-2%, with a peak of about 4% in March at 43 GHz; the polarization angle is almost stable at 43 GHz, but it shows significant variability in the range 114° - 173° at 15 GHz. In the jet region the polarization properties show a more stable behavior; the fractional polarization is ∼ 16% and the polarization angle is nearly perpendicular to the jet axis. The higher EVPA variability observed at 15 GHz is due both to a variable Faraday rotation effect and to opacity. The residual variability observed in the intrinsic polarization angle, together with the low degree of polarization in the core region, could be explained with the presence of a blend of variable cross-polarized subcomponents within the beam.

AB - In this work we present a polarization analysis at radio frequencies of Markarian 421, one of the closest (z = 0.03) TeV blazars. The observations were obtained, both in total and in polarized intensity, with the Very Long Baseline Array (VLBA) at 15, 24, and 43 GHz throughout 2011, with one observation per month (for a total of twelve epochs). We investigate the magnetic field topology and the polarization structure on parsec scale and their evolution with time. We detect polarized emission both in the core and in the jet region, and it varies with frequency, location and time. In the core region we measure a mean fractional polarization of ∼ 1-2%, with a peak of about 4% in March at 43 GHz; the polarization angle is almost stable at 43 GHz, but it shows significant variability in the range 114° - 173° at 15 GHz. In the jet region the polarization properties show a more stable behavior; the fractional polarization is ∼ 16% and the polarization angle is nearly perpendicular to the jet axis. The higher EVPA variability observed at 15 GHz is due both to a variable Faraday rotation effect and to opacity. The residual variability observed in the intrinsic polarization angle, together with the low degree of polarization in the core region, could be explained with the presence of a blend of variable cross-polarized subcomponents within the beam.

UR - http://www.scopus.com/inward/record.url?scp=85017443870&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:85017443870

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

M1 - 025

T2 - 12th European VLBI Network Symposium and Users Meeting, EVN 2014

Y2 - 7 October 2014 through 10 October 2014

ER -

ID: 88384156