H I and CO in Blue Compact Dwarf Galaxies: Haro 2 and Haro 4
H I and CO in Blue Compact Dwarf Galaxies: Haro 2 and Haro 4
复制标题
蓝色致密矮星系中的 H I 和 CO：Haro 2 和 Haro 4
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
France
中科院分区：
文献类型：
--
作者：
H. Bravo;E. Brinks;A. Baker;F. Walter;D. K. D. D. A. Guanajuato;Mexico Inaoe Puebla;Mexico Ovro Caltech;Usa Mpi Garching;Germany Nrao Socorro;Usa Iap Paris;France
我们给出了两个蓝色致密矮星系哈洛2和哈洛4以及螺旋星系哈洛26的甚大阵H I成像，它位于哈洛4西南约22′处。我们还展示了欧文斯谷射电天文台毫米波阵列获得的哈洛2的CO（1-0）分布图，以及推导出加州理工学院亚毫米波天文台获得的哈洛4的CO（2-1）发射上限。哈洛2的H I数据表明，运动学长轴垂直于光度长轴，表明氢原子围绕星系长轴旋转。这证实了先前基于CCD测光的指示，即哈洛2是一个尘埃带dE而不是dIrr。我们建议，目前的中性和分子ISM配置是由于最近的气体吸积或合并。哈洛4和邻近的螺旋哈洛26的H I分布和动力学表明，它们目前正在经历一个潮汐相互作用，加强了这样一个概念，即相互作用在触发蓝色紧凑星系中目睹的星星形成中起着重要作用。
We present Very Large Array H I imaging of two blue compact dwarf galaxies, Haro 2 and Haro 4, and of the spiral galaxy Haro 26, which is projected some 22′ southwest of Haro 4. We also show a map of the CO(1–0) distribution of Haro 2 obtained with the Owens Valley Radio Observatory Millimeter Array, as well as derive an upper limit for CO(2–1) emission from Haro 4 obtained with the Caltech Submillimeter Observatory. The H I data of Haro 2 reveal that the kinematical major axis lies perpendicular to the photometric major axis, indicating that the atomic hydrogen rotates about the major axis of the galaxy. This confirms earlier indications based on CCD photometry that Haro 2 is a dust-lane dE rather than a dIrr. We propose that the present neutral and molecular ISM configuration is due to recent gas accretion or a merger. The H I distribution and dynamics of Haro 4 and the neighboring spiral Haro 26 suggest that they are currently undergoing a tidal interaction, reinforcing the notion that interactions play an important role in triggering the star formation witnessed in blue compact galaxies.