利用 KVN 和 VERA 阵列 (KaVA) 获得的 44 GHz 甲醇脉泽的首张甚长基线干涉测量图像
星系天体物理
2014-06-12 v2
摘要
我们利用 KaVA（KVN 和 VERA 阵列，即韩国甚长基线干涉网 KVN 与射电天体测量甚长基线干涉探测 VERA 的新组合阵列），对与大质量恒星形成区 IRAS 18151-1208 中的毫米核 MM2 相关的 44 GHz I 类甲醇脉泽 () 进行了首次甚长基线干涉测量 (VLBI) 成像。我们成功以 2.7 毫角秒×1.5 毫角秒 (mas) 的综合束斑尺寸对致密脉泽特征进行了成像。这些特征仅在长度短于约 650 km（对应 uv 覆盖中 100 Mlambda）的有限数量基线上被检测到。44 GHz 甲醇脉泽的中心速度和速度宽度与静止气体一致，而非 SiO 热谱线示踪的外流。脉泽特征中的最小分量尺寸约为 5 mas × 2 mas，假设距离为 3 kpc，这对应于约 15 AU × 6 AU 的线性尺寸。这些特征的亮温度范围从约 到 K，高于先前具有约 50 mas 最高空间分辨率的甚大阵列 (Very Large Array) 观测所估计的下限。发现 IRAS 18151-1208 中的 44 GHz I 类甲醇脉泽与 MM2 核相关，据信 MM2 核的演化程度低于与 6.7 GHz II 类甲醇脉泽相关的另一个毫米核 MM1。
引用
@article{arxiv.1406.2086,
title = {The First Very Long Baseline Interferometry Image of 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)},
author = {Naoko Matsumoto and Tomoya Hirota and Koichiro Sugiyama and Kee-Tae Kim and Mikyoung Kim and Do-Young Byun and Taehyun Jung and James O. Chibueze and Mareki Honma and Osamu Kameya and Jongsoo Kim and A-Ran Lyo and Kazuhito Motogi and Chungsik Oh and Nagisa Shino and Kazuyoshi Sunada and Jaehan Bae and Hyunsoo Chung and Moon-Hee Chung and Se-Hyung Cho and Myoung-Hee Han and Seog-Tae Han and Jung-Wook Hwang and Do-Heung Je and Takaaki Jike and Dong-Kyu Jung and Jin-seung Jung and Ji-hyun Kang and Jiman Kang and Yong-Woo Kang and Yukitoshi Kan-ya and Noriyuki Kawaguchi and Bong Gyu Kim and Jaeheon Kim and Hyo Ryoung Kim and Hyun-Goo Kim and Hideyuki Kobayashi and Yusuke Kono and Tomoharu Kurayama and Changhoon Lee and Jeong Ae Lee and Jeewon Lee and Jung-Won Lee and Sang Hyun Lee and Sang-Sung Lee and Young Chol Minh and Atsushi Miyazaki and Se-Jin Oh and Tomoaki Oyama and Sun-youp Park and Duk-Gyoo Roh and Tetsuo Sasao and Satoko Sawada-Satoh and Katsunori M. Shibata and Bong Won Sohn and Min-Gyu Song and Yoshiaki Tamura and Kiyoaki Wajima and Seog-Oh Wi and Jae-Hwan Yeom and Young Joo Yun},
journal= {arXiv preprint arXiv:1406.2086},
year = {2014}
}
备注
19 pages, 3 figures