Millimeter VLBI observations of Sgr A∗ with KaVA and KVN

G. Y. Zhao; M. Kino; I. J. Cho; K. Akiyama; B. W. Sohn; T. Jung; J. C. Algaba; K. Hada; Y. Hagiwara; J. Hodgson; M. Honma; N. Kawaguchi; S. Koyama; J. A. Lee; T. Lee; K. Niinuma; J. Oh; J. H. Park; H. Ro; S. Sawada-Satoh; F. Tazaki; S. Trippe; K. Wajima; H. Yoo

doi:10.1017/S1743921316012497

Millimeter VLBI observations of Sgr A∗ with KaVA and KVN

G. Y. Zhao, M. Kino, I. J. Cho, K. Akiyama, B. W. Sohn, T. Jung, J. C. Algaba, K. Hada, Y. Hagiwara, J. Hodgson, M. Honma, N. Kawaguchi, S. Koyama, J. A. Lee, T. Lee, K. Niinuma, J. Oh, J. H. Park, H. Ro, S. Sawada-SatohF. Tazaki, S. Trippe, K. Wajima, H. Yoo

Department of Physics and Astronomy

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

Abstract

We present recent observation results of Sgr A∗ at millimeter obtained with VLBI arrays in Korea and Japan. 7 mm monitoring of Sgr A∗ is part of our AGN large project. The results at 7 epochs during 2013-2014, including high resolution maps, flux density and two-dimensional size measurements are presented. The source shows no significant variation in flux and structure related to the G2 encounter in 2014. According to recent MHD simulations by kawashima et al., flux and magnetic field energy can be expected to increase several years after the encounter; We will keep our monitoring in order to test this prediction. Astrometric observations of Sgr A∗ were performed in 2015 at 7 and 3.5 millimeter simultaneously. Source-frequency phase referencing was applied and a combined core-shift of Sgr A∗ and a nearby calibrator was measured. Future observations and analysis are necessary to determine the core-shift in each source.

Original language	English
Pages (from-to)	56-63
Number of pages	8
Journal	Proceedings of the International Astronomical Union
Volume	11
DOIs	https://doi.org/10.1017/S1743921316012497
State	Published - 2016

Bibliographical note

Publisher Copyright:
© Copyright International Astronomical Union 2017.

Keywords

Galaxies: nuclei
Individual: Sgr A
center
techniques: interferometric
techniques: phase-referencing

Access to Document

10.1017/S1743921316012497

Cite this

Zhao, G. Y., Kino, M., Cho, I. J., Akiyama, K., Sohn, B. W., Jung, T., Algaba, J. C., Hada, K., Hagiwara, Y., Hodgson, J., Honma, M., Kawaguchi, N., Koyama, S., Lee, J. A., Lee, T., Niinuma, K., Oh, J., Park, J. H., Ro, H., ... Yoo, H. (2016). Millimeter VLBI observations of Sgr A∗ with KaVA and KVN. Proceedings of the International Astronomical Union, 11, 56-63. https://doi.org/10.1017/S1743921316012497

@article{d2e7b77495cc4845bc0c441973b8dd88,

title = "Millimeter VLBI observations of Sgr A∗ with KaVA and KVN",

abstract = "We present recent observation results of Sgr A∗ at millimeter obtained with VLBI arrays in Korea and Japan. 7 mm monitoring of Sgr A∗ is part of our AGN large project. The results at 7 epochs during 2013-2014, including high resolution maps, flux density and two-dimensional size measurements are presented. The source shows no significant variation in flux and structure related to the G2 encounter in 2014. According to recent MHD simulations by kawashima et al., flux and magnetic field energy can be expected to increase several years after the encounter; We will keep our monitoring in order to test this prediction. Astrometric observations of Sgr A∗ were performed in 2015 at 7 and 3.5 millimeter simultaneously. Source-frequency phase referencing was applied and a combined core-shift of Sgr A∗ and a nearby calibrator was measured. Future observations and analysis are necessary to determine the core-shift in each source.",

keywords = "Galaxies: nuclei, Individual: Sgr A, center, techniques: interferometric, techniques: phase-referencing",

author = "Zhao, {G. Y.} and M. Kino and Cho, {I. J.} and K. Akiyama and Sohn, {B. W.} and T. Jung and Algaba, {J. C.} and K. Hada and Y. Hagiwara and J. Hodgson and M. Honma and N. Kawaguchi and S. Koyama and Lee, {J. A.} and T. Lee and K. Niinuma and J. Oh and Park, {J. H.} and H. Ro and S. Sawada-Satoh and F. Tazaki and S. Trippe and K. Wajima and H. Yoo",

note = "Publisher Copyright: {\textcopyright} Copyright International Astronomical Union 2017.",

year = "2016",

doi = "10.1017/S1743921316012497",

language = "English",

volume = "11",

pages = "56--63",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

}

Zhao, GY, Kino, M, Cho, IJ, Akiyama, K, Sohn, BW, Jung, T, Algaba, JC, Hada, K, Hagiwara, Y, Hodgson, J, Honma, M, Kawaguchi, N, Koyama, S, Lee, JA, Lee, T, Niinuma, K, Oh, J, Park, JH, Ro, H, Sawada-Satoh, S, Tazaki, F, Trippe, S, Wajima, K & Yoo, H 2016, 'Millimeter VLBI observations of Sgr A∗ with KaVA and KVN', Proceedings of the International Astronomical Union, vol. 11, pp. 56-63. https://doi.org/10.1017/S1743921316012497

TY - JOUR

T1 - Millimeter VLBI observations of Sgr A∗ with KaVA and KVN

AU - Zhao, G. Y.

AU - Kino, M.

AU - Cho, I. J.

AU - Akiyama, K.

AU - Sohn, B. W.

AU - Jung, T.

AU - Algaba, J. C.

AU - Hada, K.

AU - Hagiwara, Y.

AU - Hodgson, J.

AU - Honma, M.

AU - Kawaguchi, N.

AU - Koyama, S.

AU - Lee, J. A.

AU - Lee, T.

AU - Niinuma, K.

AU - Oh, J.

AU - Park, J. H.

AU - Ro, H.

AU - Sawada-Satoh, S.

AU - Tazaki, F.

AU - Trippe, S.

AU - Wajima, K.

AU - Yoo, H.

PY - 2016

Y1 - 2016

N2 - We present recent observation results of Sgr A∗ at millimeter obtained with VLBI arrays in Korea and Japan. 7 mm monitoring of Sgr A∗ is part of our AGN large project. The results at 7 epochs during 2013-2014, including high resolution maps, flux density and two-dimensional size measurements are presented. The source shows no significant variation in flux and structure related to the G2 encounter in 2014. According to recent MHD simulations by kawashima et al., flux and magnetic field energy can be expected to increase several years after the encounter; We will keep our monitoring in order to test this prediction. Astrometric observations of Sgr A∗ were performed in 2015 at 7 and 3.5 millimeter simultaneously. Source-frequency phase referencing was applied and a combined core-shift of Sgr A∗ and a nearby calibrator was measured. Future observations and analysis are necessary to determine the core-shift in each source.

AB - We present recent observation results of Sgr A∗ at millimeter obtained with VLBI arrays in Korea and Japan. 7 mm monitoring of Sgr A∗ is part of our AGN large project. The results at 7 epochs during 2013-2014, including high resolution maps, flux density and two-dimensional size measurements are presented. The source shows no significant variation in flux and structure related to the G2 encounter in 2014. According to recent MHD simulations by kawashima et al., flux and magnetic field energy can be expected to increase several years after the encounter; We will keep our monitoring in order to test this prediction. Astrometric observations of Sgr A∗ were performed in 2015 at 7 and 3.5 millimeter simultaneously. Source-frequency phase referencing was applied and a combined core-shift of Sgr A∗ and a nearby calibrator was measured. Future observations and analysis are necessary to determine the core-shift in each source.

KW - Galaxies: nuclei

KW - Individual: Sgr A

KW - center

KW - techniques: interferometric

KW - techniques: phase-referencing

UR - http://www.scopus.com/inward/record.url?scp=85012241858&partnerID=8YFLogxK

U2 - 10.1017/S1743921316012497

DO - 10.1017/S1743921316012497

M3 - Article

AN - SCOPUS:85012241858

SN - 1743-9213

VL - 11

SP - 56

EP - 63

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

ER -

Millimeter VLBI observations of Sgr A∗ with KaVA and KVN

Abstract

Bibliographical note

Keywords

Access to Document

Fingerprint

Cite this