The ATLAS3D project - XVIII. CARMA CO imaging survey of early-type galaxies
The ATLAS3D project - XVIII. CARMA CO imaging survey of early-type galaxies
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ATLAS3D 项目 - XVIII。
DOI：
10.1093/mnras/sts299
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发表时间：
2013
影响因子：
4.8
通讯作者：
Alatalo K
中科院分区：
文献类型：
--
作者：
Alatalo K
我们提出了毫米天文学研究组合阵列 (CARMA) ATLAS3D 分子气体成像调查，这是对富含 CO 的早期型星系中分子气体的分布和运动学的系统研究。我们的 40 个星系的完整样本（30 个是新绘制的，10 个取自文献）的 12CO(1–0) 积分通量达到 18.5 Jy km s−1，它代表了迄今为止该类型中最大、研究最透彻的样本。每个星系的 CO 分布与 g−r 彩色图像（代表尘埃）的比较表明，分子气体和尘埃分布非常一致，并且追踪相同的底层星际介质。这些星系表现出多种CO形态，包括盘状（50%）、环（15%）、棒+环（10%）、旋臂（5%）以及轻度（12.5%）和强烈（7.5%）破坏形态。星系质量和二氧化碳形态之间似乎存在弱趋势，因此样本中质量最大的星系往往具有圆盘形态的分子气体。我们得出样本中总吸积分子气体质量的下限为 2.48 × 1010M⊙，或者样本内每次小合并约为 8.3 × 108M⊙，这与小合并恒星质量比一致。
We present the Combined Array for Research in Millimeter Astronomy (CARMA) ATLAS3Dmolecular gas imaging survey, a systematic study of the distribution and kinematics of molecular gas in CO-rich early-type galaxies. Our full sample of 40 galaxies (30 newly mapped and 10 taken from the literature) is complete to a12CO(1–0) integrated flux of 18.5 Jy km s−1, and it represents the largest, best studied sample of its type to date. A comparison of the CO distribution of each galaxy to theg−rcolour image (representing dust) shows that the molecular gas and dust distributions are in good agreement and trace the same underlying interstellar medium. The galaxies exhibit a variety of CO morphologies, including discs (50 per cent), rings (15 per cent), bars+rings (10 per cent), spiral arms (5 per cent) and mildly (12.5 per cent) and strongly (7.5 per cent) disrupted morphologies. There appear to be weak trends between galaxy mass and CO morphology, whereby the most massive galaxies in the sample tend to have molecular gas in a disc morphology. We derive a lower limit to the total accreted molecular gas mass across the sample of 2.48 × 1010M⊙, or approximately 8.3 × 108M⊙per minor merger within the sample, consistent with minor merger stellar mass ratios.