Milliarcsecond-scale spectral properties and jet motions in M 87

Richard Dodson; P.G. Edwards; H. Hirabayashi

doi:10.1093/pasj/58.2.243

Milliarcsecond-scale spectral properties and jet motions in M 87

Richard Dodson, P.G. Edwards, H. Hirabayashi

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37 Citations (Web of Science)

Abstract

We have combined high resolution VLBI Space Observatory Programme (VSOP) data at 1.6 and 4.8 GHz with Very Long Baseline Array (VLBA) data at higher frequencies and with similar resolutions to study the spectral properties of the core of M 87 with milliarcsec resolution. The VSOP data allows a more accurate measurement of the turnover frequency, and hence more reliable determination of associated physical parameters of the source. Comparison of the images with previously published images yields no evidence for significant motions of components in the parsec-scale jet. In addition, the brightness temperatures obtained from modelfits to the core are well below the inverse Compton limit, suggesting that the radio emission we are observing is not strongly Doppler boosted.

Original language	English
Pages (from-to)	243-251
Journal	Publications of the Astronomical Society of Japan
Volume	58
Issue number	2
DOIs	https://doi.org/10.1093/pasj/58.2.243
Publication status	Published - 2006

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abstract = "We have combined high resolution VLBI Space Observatory Programme (VSOP) data at 1.6 and 4.8 GHz with Very Long Baseline Array (VLBA) data at higher frequencies and with similar resolutions to study the spectral properties of the core of M 87 with milliarcsec resolution. The VSOP data allows a more accurate measurement of the turnover frequency, and hence more reliable determination of associated physical parameters of the source. Comparison of the images with previously published images yields no evidence for significant motions of components in the parsec-scale jet. In addition, the brightness temperatures obtained from modelfits to the core are well below the inverse Compton limit, suggesting that the radio emission we are observing is not strongly Doppler boosted.",

author = "Richard Dodson and P.G. Edwards and H. Hirabayashi",

year = "2006",

doi = "10.1093/pasj/58.2.243",

language = "English",

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pages = "243--251",

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AU - Dodson, Richard

AU - Edwards, P.G.

AU - Hirabayashi, H.

PY - 2006

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N2 - We have combined high resolution VLBI Space Observatory Programme (VSOP) data at 1.6 and 4.8 GHz with Very Long Baseline Array (VLBA) data at higher frequencies and with similar resolutions to study the spectral properties of the core of M 87 with milliarcsec resolution. The VSOP data allows a more accurate measurement of the turnover frequency, and hence more reliable determination of associated physical parameters of the source. Comparison of the images with previously published images yields no evidence for significant motions of components in the parsec-scale jet. In addition, the brightness temperatures obtained from modelfits to the core are well below the inverse Compton limit, suggesting that the radio emission we are observing is not strongly Doppler boosted.

AB - We have combined high resolution VLBI Space Observatory Programme (VSOP) data at 1.6 and 4.8 GHz with Very Long Baseline Array (VLBA) data at higher frequencies and with similar resolutions to study the spectral properties of the core of M 87 with milliarcsec resolution. The VSOP data allows a more accurate measurement of the turnover frequency, and hence more reliable determination of associated physical parameters of the source. Comparison of the images with previously published images yields no evidence for significant motions of components in the parsec-scale jet. In addition, the brightness temperatures obtained from modelfits to the core are well below the inverse Compton limit, suggesting that the radio emission we are observing is not strongly Doppler boosted.

U2 - 10.1093/pasj/58.2.243

DO - 10.1093/pasj/58.2.243

M3 - Article

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SP - 243

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JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

SN - 0004-6264

IS - 2

ER -

Milliarcsecond-scale spectral properties and jet motions in M 87

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