Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz

Shoko Koyama; Motoki Kino; Akihiro Doi; Kotaro Niinuma; Kazuhiro Hada; Hiroshi Nagai; Mareki Honma; Kazunori Akiyama; Marcello Giroletti; Gabriele Giovannini; Monica Orienti; Naoki Isobe; Jun Kataoka; David Paneque; Hideyuki Kobayashi; Keiichi Asada

doi:10.1093/pasj/psu144

Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz

Shoko Koyama, Motoki Kino, Akihiro Doi, Kotaro Niinuma, Kazuhiro Hada, Hiroshi Nagai, Mareki Honma, Kazunori Akiyama, Marcello Giroletti, Gabriele Giovannini, Monica Orienti, Naoki Isobe, Jun Kataoka, David Paneque, Hideyuki Kobayashi, Keiichi Asada

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

3 Citations (Scopus)

Abstract

We investigate the position of the radio core in a blazar by multi-epoch astrometric observations at 43 GHz. Using the VLBI Exploration of Radio Astrometry (VERA), we have conducted four adjacent observations in 2011 February and another four in 2011 October, and succeeded in measuring the position of the radio core in the TeV blazar Mrk 501 relative to a distant compact quasar NRAO 512. During our observations, we find that (1) there is no positional change within ∼0.2 mas or ∼2.0 pc de-projected with ±1 σ error for the weighted-mean phase-referenced positions of the Mrk 501 core relative to NRAO 512 over four adjacent days, and (2) there is an indication of position change for the 3C 345 core relative to NRAO 512. By applying our results to the standard internal shock model for blazars, we constrain the bulk Lorenz factors of the ejecta.

Original language	English
Article number	67
Journal	Publications of the Astronomical Society of Japan
Volume	67
Issue number	4
DOIs	https://doi.org/10.1093/pasj/psu144
Publication status	Published - 2015 May 25

Keywords

Astrometry
Galaxies: active
Galaxies: individual (Mrk 501 3C 345, NRAO 512)
Radio continuum: galaxies
Techniques: interferometric

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Koyama, S., Kino, M., Doi, A., Niinuma, K., Hada, K., Nagai, H., Honma, M., Akiyama, K., Giroletti, M., Giovannini, G., Orienti, M., Isobe, N., Kataoka, J., Paneque, D., Kobayashi, H., & Asada, K. (2015). Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz. Publications of the Astronomical Society of Japan, 67(4), Article 67. https://doi.org/10.1093/pasj/psu144

Koyama, S, Kino, M, Doi, A, Niinuma, K, Hada, K, Nagai, H, Honma, M, Akiyama, K, Giroletti, M, Giovannini, G, Orienti, M, Isobe, N, Kataoka, J, Paneque, D, Kobayashi, H & Asada, K 2015, 'Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz', Publications of the Astronomical Society of Japan, vol. 67, no. 4, 67. https://doi.org/10.1093/pasj/psu144

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abstract = "We investigate the position of the radio core in a blazar by multi-epoch astrometric observations at 43 GHz. Using the VLBI Exploration of Radio Astrometry (VERA), we have conducted four adjacent observations in 2011 February and another four in 2011 October, and succeeded in measuring the position of the radio core in the TeV blazar Mrk 501 relative to a distant compact quasar NRAO 512. During our observations, we find that (1) there is no positional change within ∼0.2 mas or ∼2.0 pc de-projected with ±1 σ error for the weighted-mean phase-referenced positions of the Mrk 501 core relative to NRAO 512 over four adjacent days, and (2) there is an indication of position change for the 3C 345 core relative to NRAO 512. By applying our results to the standard internal shock model for blazars, we constrain the bulk Lorenz factors of the ejecta.",

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AU - Koyama, Shoko

AU - Kino, Motoki

AU - Doi, Akihiro

AU - Niinuma, Kotaro

AU - Hada, Kazuhiro

AU - Nagai, Hiroshi

AU - Honma, Mareki

AU - Akiyama, Kazunori

AU - Giroletti, Marcello

AU - Giovannini, Gabriele

AU - Orienti, Monica

AU - Isobe, Naoki

AU - Kataoka, Jun

AU - Paneque, David

AU - Kobayashi, Hideyuki

AU - Asada, Keiichi

PY - 2015/5/25

Y1 - 2015/5/25

N2 - We investigate the position of the radio core in a blazar by multi-epoch astrometric observations at 43 GHz. Using the VLBI Exploration of Radio Astrometry (VERA), we have conducted four adjacent observations in 2011 February and another four in 2011 October, and succeeded in measuring the position of the radio core in the TeV blazar Mrk 501 relative to a distant compact quasar NRAO 512. During our observations, we find that (1) there is no positional change within ∼0.2 mas or ∼2.0 pc de-projected with ±1 σ error for the weighted-mean phase-referenced positions of the Mrk 501 core relative to NRAO 512 over four adjacent days, and (2) there is an indication of position change for the 3C 345 core relative to NRAO 512. By applying our results to the standard internal shock model for blazars, we constrain the bulk Lorenz factors of the ejecta.

AB - We investigate the position of the radio core in a blazar by multi-epoch astrometric observations at 43 GHz. Using the VLBI Exploration of Radio Astrometry (VERA), we have conducted four adjacent observations in 2011 February and another four in 2011 October, and succeeded in measuring the position of the radio core in the TeV blazar Mrk 501 relative to a distant compact quasar NRAO 512. During our observations, we find that (1) there is no positional change within ∼0.2 mas or ∼2.0 pc de-projected with ±1 σ error for the weighted-mean phase-referenced positions of the Mrk 501 core relative to NRAO 512 over four adjacent days, and (2) there is an indication of position change for the 3C 345 core relative to NRAO 512. By applying our results to the standard internal shock model for blazars, we constrain the bulk Lorenz factors of the ejecta.

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KW - Galaxies: active

KW - Galaxies: individual (Mrk 501 3C 345, NRAO 512)

KW - Radio continuum: galaxies

KW - Techniques: interferometric

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Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz

Abstract

Keywords

ASJC Scopus subject areas

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