arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1202.2969astro-ph.CO
收藏

CMB作为研究星系中暗重子的一种可能的新工具

CMB as a possible new tool to study the dark baryons in galaxies

F. De Paolis, G. Ingrosso, A. A. Nucita, D. Vetrugno, V. G. Gurzadyan, A. L. Kashin, H. G. Khachatryan, S. Mirzoyan, Ph. Jetzer, A. Qadir

摘要:

重子约占我们宇宙的4%,但它们中的大多数都不见了,我们不知道它们隐藏在哪里以及以什么形式隐藏。这就构成了所谓的重子缺失问题。一种可能是这些重子的一部分隐藏在星系晕中。我们展示了如何7年的数据获得的WMAP卫星可用于跟踪附近的巨大的螺旋星系M31的晕。我们检测到的温度不对称的M31晕沿旋转方向高达约120千秒差距。这可能是第一次在微波中探测到星系晕,并可能开辟一条新的途径,利用高精度的CMB测量来探测这些相对较少研究的星系天体中隐藏的重子。

英文摘要:

Baryons constitute about 4% of our universe, but most of them are missing and we do not know where and in what form they are hidden. This constitute the so-called missing baryon problem. A possibility is that part of these baryons are hidden in galactic halos. We show how the 7-year data obtained by the WMAP satellite may be used to trace the halo of the nearby giant spiral galaxy M31. We detect a temperature asymmetry in the M31 halo along the rotation direction up to about 120 kpc. This could be the first detection of a galactic halo in microwaves and may open a new way to probe hidden baryons in these relatively less studied galactic objects using high accuracy CMB measurements.

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。

↑