arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.3682astro-ph
收藏

M82内盘和外流中冷尘埃的亚毫米波连续谱性质

Submillimeter Continuum Properties of Cold Dust in the Inner Disk and Outflows of M82

Lerothodi L. Leeuw, E. Ian Robson

摘要:

在350、450、750和850微米波长下对星暴星系M82进行了深亚毫米(submm)连续成像观测,这些观测是用夏威夷詹姆斯·克拉克·麦克斯韦望远镜上的亚毫米普通用户测辐射热计阵列(SCUBA)进行的。所呈现的地图包括从SCUBA数据档案中挖掘的submm数据的共同添加。这些共同添加的数据产生了迄今为止最深的M82亚毫米连续谱图,其中低水平的850微米连续谱已被探测到1.5kpc,比以前发表的任何该星系的亚毫米探测半径至少远10%。整体亚毫米形态和空间光谱能量分布的M82有一个一般的南北不对称性与H-α和X射线风一致,支持协会的扩展连续与尘埃颗粒从磁盘到晕的流出。新的数据提出了有趣的点的起源和结构的submm发射的内部磁盘的M82。特别是,水下呼吸器短波长的证据submm连续峰沿银盘不对称分布,表明内盘发射是再辐射尘埃浓度沿酒吧(或可能是螺旋),而不是边缘的尘埃环面,因为通常假设。来自史密森亚毫米阵列和后来的阿塔卡马大毫米阵列的更高分辨率的亚毫米干涉测量数据应该在空间上解决并进一步限制M82中报告的尘埃排放结构。

英文摘要:

Deep submillimeter (submm) continuum imaging observations of the starburst galaxy M82 are presented at 350, 450, 750 and 850 micron wavelengths, that were undertaken with the Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope in Hawaii. The presented maps include a co-addition of submm data mined from the SCUBA Data Archive. The co-added data produce the deepest submm continuum maps yet of M82, in which low-level 850 micron continuum has been detected out to 1.5kpc, at least 10% farther in radius than any previously published submm detections of this galaxy. The overall submm morphology and spatial spectral energy distribution of M82 have a general north-south asymmetry consistent with H-alpha and X-ray winds, supporting the association of the extended continuum with outflows of dust grains from the disk into the halo. The new data raise interesting points about the origin and structure of the submm emission in the inner disk of M82. In particular, SCUBA short wavelength evidence of submm continuum peaks that are asymmetrically distributed along the galactic disk suggests the inner-disk emission is re-radiation from dust concentrations along a bar (or perhaps a spiral) rather than edges of a dust torus, as is commonly assumed. Higher resolution submm interferometery data from the Smithsonian Submillimeter Array and later Atacama Large Millimeter Array should spatially resolve and further constrain the reported dust emission structures in M82.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑