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Title: | Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz | Authors: | Koyama, Shoko Kino, Motoki Doi, Akihiro Niinuma, Kotaro Hada, Kazuhiro Nagai, Hiroshi Honma, Mareki Akiyama, Kazunori GIROLETTI, MARCELLO Giovannini, Gabriele ORIENTI, Monica Isobe, Naoki Kataoka, Jun Paneque, David Kobayashi, Hideyuki Asada, Keiichi |
Issue Date: | 2015 | Journal: | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | Number: | 67 | Issue: | 4 | First Page: | 67 | 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. | Acknowledgments: | The VERA is operated by Mizusawa VLBI Observatory, a branch of the National Astronomical Observatory of Japan. We thank K. M. Shibata, T. Jike, and all the staff who helped the operation of the VERA observations presented in this paper. We are grateful to T. Oyama, T. Hirota, M. Kim, N. Matsumoto, and M. Sato for discussing how to reduce the VERA data. SK thanks the internal referee at the MPIfR, E. Ros, for his constructive comments. We are also grateful to S. Mineshige, K. Kohno, M. Tsuboi, K. Ebisawa, and T. Mizuno for many useful comments. We thank the anonymous referee for useful comments and suggestions. SK acknowledges the research grant provided by the Global COE program of University of Tokyo. Part of this work was done with the contribution of the Italian Ministry of Foreign Affairs and University and Research for the collaboration project between Italy and Japan. This work was partially supported by Grant-in-Aid for Scientific Research, KAKENHI 24340042 (AD) and 2450240 (MK) from the Japan Society for the Promotion of Science (JSPS). | URI: | http://hdl.handle.net/20.500.12386/25222 | URL: | https://academic.oup.com/pasj/article/67/4/67/1535452 | ISSN: | 0004-6264 | DOI: | 10.1093/pasj/psu144 | Bibcode ADS: | 2015PASJ...67...67K | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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PASJ1501.03498-1.pdf | postprint | 415.05 kB | Adobe PDF | View/Open |
psu144.pdf | [Administrators only] | 698.91 kB | Adobe PDF |
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