arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.0001astro-ph
收藏

暗物质的第二个腐蚀性环导致了麒麟星环吗?

Does the Second Caustic Ring of Dark Matter Cause the Monoceros Ring of Stars ?

Aravind Natarajan, Pierre Sikivie

摘要:

根据预测,暗物质的焦散环存在于银河系平面上,半径为$n = 1,2,3 ..$的半径为$a_n \simeq 40 {\rm kpc}/n$。最近发现的麒麟座星环位于$n=2$焦散星系附近,促使我们考虑这两个天体之间可能存在的联系。我们确定了两个过程,通过该麒麟星环的恒星可能已经形成。一个过程是气体迁移到焦散面上的角速度最小值,从而增强了那里的恒星形成。另一种是当焦散的质量和半径缓慢增长时,恒星轨道的绝热变形。第二个过程预测了一个订单100%的增强盘星的密度在焦散环的位置。

英文摘要:

Caustic rings of dark matter were predicted to exist in the plane of the Galaxy at radii $a_n \simeq 40 {\rm kpc}/n$ for $n = 1,2,3 ..$. The recently discovered Monoceros Ring of stars is located near the $n=2$ caustic, prompting us to consider a possible connection between these two objects. We identify two processes through which the Monoceros Ring of stars may have formed. One process is the migration of gas to an angular velocity minimum at the caustic leading to enhanced star formation there. The other is the adiabatic deformation of star orbits as the caustic slowly grows in mass and radius. The second process predicts an order 100% enhancement of the density of disk stars at the location of the caustic ring.

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。

↑