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Probing the Precise Location of the Radio Core in Mrk 501 with VLBA Astrometry

S. Koyama, M. Kino, A. Doi, E. Ros, K. Niinuma, H. Nagai, K. Hada, M. Giroletti, G. Giovannini, M. Orienti

Transactions of IAA RAS, issue 40, 122–127 (2017)

Keywords: VLBI, Astrometry, Blazars

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Abstract

We report astrometric results on the stability of the core in the nearby TeV blazar Mrk 501 based on 6-epoch monitoring with the VLBA at 43 GHz. Our results suggest a stable position of the core within 98 ± 73 µas, refining our earlier findings by VERA in 2011, which pinpointed the position within 200 µas. We constrain bulk Lorentz factors of the jet based on the results of core position measurements. We will further discuss a possible relation between the source activity and the distributed scale of the radio core position.

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S. Koyama, M. Kino, A. Doi, E. Ros, K. Niinuma, H. Nagai, K. Hada, M. Giroletti, G. Giovannini, M. Orienti. Probing the Precise Location of the Radio Core in Mrk 501 with VLBA Astrometry // Transactions of IAA RAS. — 2017. — Issue 40. — P. 122–127. TY - JOUR TI - Probing the Precise Location of the Radio Core in Mrk 501 with VLBA Astrometry AU - S. Koyama AU - M. Kino AU - A. Doi AU - E. Ros AU - K. Niinuma AU - H. Nagai AU - K. Hada AU - M. Giroletti AU - G. Giovannini AU - M. Orienti PY - 2017 T2 - Transactions of IAA RAS IS - 40 SP - 122 AB - We report astrometric results on the stability of the core in the nearby TeV blazar Mrk 501 based on 6-epoch monitoring with the VLBA at 43 GHz. Our results suggest a stable position of the core within 98 ± 73 µas, refining our earlier findings by VERA in 2011, which pinpointed the position within 200 µas. We constrain bulk Lorentz factors of the jet based on the results of core position measurements. We will further discuss a possible relation between the source activity and the distributed scale of the radio core position. ER -