3 mm GMVA observations of total and polarized emission from blazar and radio galaxy core regions

Carolina Casadio; Thomas P. Krichbaum; Alan P. Marscher; Svetlana G. Jorstad; José L. Gómez; Iván Agudo; Uwe Bach; Jae Young Kim; Jeffrey A. Hodgson; Anton J. Zensus

doi:10.3390/galaxies5040067

3 mm GMVA observations of total and polarized emission from blazar and radio galaxy core regions

Carolina Casadio, Thomas P. Krichbaum, Alan P. Marscher, Svetlana G. Jorstad, José L. Gómez, Iván Agudo, Uwe Bach, Jae Young Kim, Jeffrey A. Hodgson, Anton J. Zensus

Department of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

We present total and linearly polarized 3 mm Global mm-VLBI Array (GMVA; mm-VLBI: Very Long Baseline Interferometry observations at millimetre wavelengths) images of a sample of blazars and radio galaxies from the VLBA-BU-BLAZAR 7 mm monitoring program designed to probe the innermost regions of active galactic nuclei (AGN) jets and locate the sites of gamma-ray emission observed by the Fermi-LAT. The lower opacity at 3 mm and improved angular resolution-on the order of 50 microarcseconds-allow us to distinguish features in the jet not visible in the 7 mm VLBA data. We also compare two different methods used for the calibration of instrumental polarisation and we analyze the resulting images for some of the sources in the sample.

Original language	English
Article number	67
Journal	Galaxies
Volume	5
Issue number	4
DOIs	https://doi.org/10.3390/galaxies5040067
State	Published - 18 Oct 2017

Bibliographical note

Publisher Copyright:
© 2017 by the authors.

Keywords

Galaxies: active
Galaxies: jets
Techniques: high angular resolution

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10.3390/galaxies5040067

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title = "3 mm GMVA observations of total and polarized emission from blazar and radio galaxy core regions",

abstract = "We present total and linearly polarized 3 mm Global mm-VLBI Array (GMVA; mm-VLBI: Very Long Baseline Interferometry observations at millimetre wavelengths) images of a sample of blazars and radio galaxies from the VLBA-BU-BLAZAR 7 mm monitoring program designed to probe the innermost regions of active galactic nuclei (AGN) jets and locate the sites of gamma-ray emission observed by the Fermi-LAT. The lower opacity at 3 mm and improved angular resolution-on the order of 50 microarcseconds-allow us to distinguish features in the jet not visible in the 7 mm VLBA data. We also compare two different methods used for the calibration of instrumental polarisation and we analyze the resulting images for some of the sources in the sample.",

keywords = "Galaxies: active, Galaxies: jets, Techniques: high angular resolution",

author = "Carolina Casadio and Krichbaum, {Thomas P.} and Marscher, {Alan P.} and Jorstad, {Svetlana G.} and G{\'o}mez, {Jos{\'e} L.} and Iv{\'a}n Agudo and Uwe Bach and Kim, {Jae Young} and Hodgson, {Jeffrey A.} and Zensus, {Anton J.}",

note = "Publisher Copyright: {\textcopyright} 2017 by the authors.",

year = "2017",

month = oct,

day = "18",

doi = "10.3390/galaxies5040067",

language = "English",

volume = "5",

journal = "Galaxies",

issn = "2075-4434",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

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TY - JOUR

T1 - 3 mm GMVA observations of total and polarized emission from blazar and radio galaxy core regions

AU - Casadio, Carolina

AU - Krichbaum, Thomas P.

AU - Marscher, Alan P.

AU - Jorstad, Svetlana G.

AU - Gómez, José L.

AU - Agudo, Iván

AU - Bach, Uwe

AU - Kim, Jae Young

AU - Hodgson, Jeffrey A.

AU - Zensus, Anton J.

PY - 2017/10/18

Y1 - 2017/10/18

N2 - We present total and linearly polarized 3 mm Global mm-VLBI Array (GMVA; mm-VLBI: Very Long Baseline Interferometry observations at millimetre wavelengths) images of a sample of blazars and radio galaxies from the VLBA-BU-BLAZAR 7 mm monitoring program designed to probe the innermost regions of active galactic nuclei (AGN) jets and locate the sites of gamma-ray emission observed by the Fermi-LAT. The lower opacity at 3 mm and improved angular resolution-on the order of 50 microarcseconds-allow us to distinguish features in the jet not visible in the 7 mm VLBA data. We also compare two different methods used for the calibration of instrumental polarisation and we analyze the resulting images for some of the sources in the sample.

AB - We present total and linearly polarized 3 mm Global mm-VLBI Array (GMVA; mm-VLBI: Very Long Baseline Interferometry observations at millimetre wavelengths) images of a sample of blazars and radio galaxies from the VLBA-BU-BLAZAR 7 mm monitoring program designed to probe the innermost regions of active galactic nuclei (AGN) jets and locate the sites of gamma-ray emission observed by the Fermi-LAT. The lower opacity at 3 mm and improved angular resolution-on the order of 50 microarcseconds-allow us to distinguish features in the jet not visible in the 7 mm VLBA data. We also compare two different methods used for the calibration of instrumental polarisation and we analyze the resulting images for some of the sources in the sample.

KW - Galaxies: active

KW - Galaxies: jets

KW - Techniques: high angular resolution

UR - http://www.scopus.com/inward/record.url?scp=85032179567&partnerID=8YFLogxK

U2 - 10.3390/galaxies5040067

DO - 10.3390/galaxies5040067

M3 - Article

AN - SCOPUS:85032179567

SN - 2075-4434

VL - 5

JO - Galaxies

JF - Galaxies

IS - 4

M1 - 67

ER -

3 mm GMVA observations of total and polarized emission from blazar and radio galaxy core regions

Abstract

Bibliographical note

Keywords

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Cite this