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MAT14 - The First Very Long Baseline Interferometry Image of a 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)

Short title: Matsumoto et al. (2014)
Authors: Matsumoto, Naoko Hirota, Tomoya Sugiyama, Koichiro Kim, Kee-Tae Kim, Mikyoung Byun, Do-Young Jung, Taehyun Chibueze, James O. Honma, Mareki Kameya, Osamu Kim, Jongsoo Lyo, A.-Ran Motogi, Kazuhito Oh, Chungsik Shino, Nagisa Sunada, Kazuyoshi Bae, Jaehan Chung, Hyunsoo Chung, Moon-Hee Cho, Se-Hyung Han, Myoung-Hee Han, Seog-Tae Hwang, Jung-Wook Je, Do-Heung Jike, Takaaki Jung, Dong-Kyu Jung, Jin-seung Kang, Ji-hyun Kang, Jiman Kang, Yong-Woo Kan-ya, Yukitoshi Kawaguchi, Noriyuki Kim, Bong Gyu Kim, Jaeheon Ryoung Kim, Hyo Kim, Hyun-Goo Kobayashi, Hideyuki Kono, Yusuke Kurayama, Tomoharu Lee, Changhoon Lee, Jeong Ae Lee, Jeewon Lee, Jung-Won Lee, Sang Hyun Lee, Sang-Sung Minh, Young Chol Miyazaki, Atsushi Oh, Se-Jin Oyama, Tomoaki Park, Sun-youp Roh, Duk-Gyoo Sasao, Tetsuo Sawada-Satoh, Satoko Shibata, Katsunori M. Sohn, Bong Won Song, Min-Gyu Tamura, Yoshiaki Wajima, Kiyoaki Wi, Seog-Oh Yeom, Jae-Hwan Yun, Young Joo
Journal: The Astrophysical Journal Letters, Volume 789, Issue 1, article id. L1, 6 pp. (2014).
Bibcode: 2014ApJ...789L...1M

PDF: MAT14.pdf

• Target type: High_mass_SFR
  Transitions: CH3OH_23.4(I),CH3OH_25-30_GHz(I),CH3OH_36(I),CH3OH_44(I),CH3OH_95(I),CH3OH_132(I),CH3OH_19(II)
  

• Abstract

  We have carried out the first very long baseline interferometry (VLBI) imaging of a 44 GHz class I methanol maser (70-61 A +) associated with a millimeter core MM2 in a massive star-forming region IRAS 18151-1208 with KaVA (KVN and VERA Array), which is a newly combined array of KVN (Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). We have succeeded in imaging compact maser features with a synthesized beam size of 2.7 milliarcseconds × 1.5 milliarcseconds (mas). These features are detected at a limited number of baselines within the length of shorter than ≈ 650 km corresponding to 100 Mlambda in the uv-coverage. The central velocity and the velocity width of the 44 GHz methanol maser are consistent with those of the quiescent gas rather than the outflow traced by the SiO thermal line. The minimum component size among the maser features is ~5 mas × 2 mas, which corresponds to the linear size of ~15 AU × 6 AU assuming a distance of 3 kpc. The brightness temperatures of these features range from ~3.5 × 108 to 1.0 × 1010 K, which are higher than the estimated lower limit from a previous Very Large Array observation with the highest spatial resolution of ~50 mas. The 44 GHz class I methanol maser in IRAS 18151-1208 is found to be associated with the MM2 core, which is thought to be less evolved than another millimeter core MM1 associated with the 6.7 GHz class II methanol maser. eprintid: arXiv:1406.2086

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DSS colored 2MASS colored WISE colored SDSS color IRAC color I1,I2,I4 GLIMPSE 360 PACS color (70-160 um) SPIRE color (250-500 um) NVSS (1.4GHz) ATLASGAL 870 um ATLASGAL 870 um + Planck Bolocam 1.1 mm UKIDSS K 2MASS K