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A Broad HCO <sup>+</sup> Absorption Line Associated with the Circumnuclear Torus of NGC 1052
Sawada-Satoh, Satoko,Byun, Do-Young,Lee, Sang-Sung,Oh, Se-Jin,Roh, Duk-Gyoo,Kameno, Seiji,Yeom, Jae-Hwan,Jung, Dong-Kyu,Oh, Chungsik,Kim, Hyo-Ryoung,Hwang, Ju-Yeon American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.872 No.2
SAWADA-SATOH, S.,AKIYAMA, K.,NIINUMA, K.,NAGAI, H.,KINO, M.,D'AMMANDO, F.,KOYAMA, S.,HADA, K.,ORIENTI, M.,HONMA, M.,SHIBATA, K.M. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We present a kinematic study of the parsec-scale radio jet in OJ 287, one of the most studied BL Lac objects, during ${\gamma}$-ray flares, to explore the relation between parsec-scale radio jet activity and ${\gamma}$-ray emission. The 22-GHz light curve of OJ 287 show three obvious flare events around 2011 May, 2011 October, and 2012 March. The second radio flare occurred during the ${\gamma}$-ray flaring period, and the third radio flare seemed to precede the ${\gamma}$-ray flare by one month. One jet component moved outward with respect to the core component with an apparent superluminal speed (~ 11c) from 2010 November to 2011 November. Then it changed direction, moving apparently inward in 2011 November, when the ${\gamma}$-ray flare occurred. The observed apparent inward motion of the jet at 22 GHz could be caused by a new jet component, unresolved at 22 GHz, in the innermost region.
POSITIONAL COINCIDENCE BETWEEN WATER MASERS AND A PLASMA TORUS IN NGC 1052
SAWADA-SATOH SATOKO,KAMENO SEIJI,SHIBATA KATSUNORI M.,INOUE MAKOTO The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
We present results of the VLBA observation toward the radio continuum and water maser emissions in a nearby LINER galaxy NGC 1052. The jet structure observed in 2000 is similar to that in 1998, and the two jet structures in 1998 and 2000 support the sub-luminal motion with apparent velocity of 0.26c. Distribution of water maser spots are located ${\~}$0.05 pc shifted to southwest from the component which is supported to be the nucleus, and no rapid positional change of the water maser gas with respect to the central engine is seen from 1995 to 2000. The maser gas is positionally coincident with a plasma torus, and the position of the maser gas relative to the nucleus is stable from 1995 to 2000. The maser gas in NGC 1052 could be explained to be associated with the nuclear circumnuclear torus or disk like the situation found in the nucleus of NGC 4258.
THE VLBI MONITORING PROJECT FOR 6.7 GHz METHANOL MASERS USING THE JVN/EAVN
SUGIYAMA, KOICHIRO,FUJISAWA, KENTA,HACHISUKA, KAZUYA,YONEKURA, YOSHINORI,MOTOGI, KAZUHITO,SAWADA-SATOH, SATOKO,MATSUMOTO, NAOKO,SAITO, YU,HIRANO, DAIKI,HAYASHI, KYONOSUKE,SHEN, ZHIQIANG,HONMA, MAREKI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We have initiated a Very Long Baseline Interferometer (VLBI) monitoring project of 36 methanol maser sources at 6.7 GHz using the Japanese VLBI Network (JVN) and East-Asian VLBI Network (EAVN), starting in August 2010. The purpose of this project is to systematically reveal 3-dimensional (3-D) kine-matics of rotating disks around forming high-mass protostars. As an initial result, we present proper mo- tion detections for two methanol maser sources showing an elliptical spatial morphology, G 002.53+00.19 and G 006.79-00.25, which could be the best candidates associated with the disk. The detected proper motions indicate a simple rotation in G 002.53+00.19 and rotation with expansion in G 006.79-00.25, respectively, on the basis of disk model fits with rotating and expanding components. The expanding motions might be caused by the magnetic-centrifugal wind on the disk.
ASIAA EXTRAGALACTIC STUDY WITH THE SMA
MATSUSHITA SATOKI,MAO RUI-QING,MULLER SEBASTIEN,CHOU CHUEN- YI,SAWADA-SATOH SATOKO,TRUNG DINH-VAN,LIM JEREMY,HSIEH PEI-YING,PECK ALISON B. The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
We present CO(3-2), CO(2-1), and 230 GHz (1.3 mm) continuum images of nearby galaxies taken with the Submillimeter Array (SMA). Our main topic is to study the relation between higher-J molecular gas (e.g., CO J=3-2, 2-1) and nuclear activities (e.g., active galactic nuclei [AGNs] and starbursts). The nearby Seyfert 2 galaxy M51 shows strong CO(3-2) emission from the circumnuclear molecular gas, with an intensity twice as strong as that of the CO(1-0) emission. Strong CO(3-2) emission enhancement suggests that the circum nuclear molecular gas in M51 is warm and dense, which may be related to the AGN activities. Molecular gas in the nearby moderate starburst galaxy NGC 6946 is distributed along the large-scale bar or spiral arms and along the minibar, and the multi-J CO line images show very similar distribution to each other. For this galaxy, there is no clear enhancement in higher-J lines as seen in M51, which may be because NGC 6946 does not have clear AGN activities. Based on the results of these two galaxies, the physical conditions of the circum nuclear molecular gas may be related to the AGN activities. We also observed the nearby edge-on starburst galaxy NGC 3628 and the starburst/Seyfert composite galaxy NGC 4945 with the CO(2-1) line and 230 GHz (1.3 mm) continuum emission. These information will give us some hints for understanding the relation between nuclear activities and circum nuclear molecular gas and dust.