arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1410.7435astro-ph.HE
收藏

超新星遗迹G266 .2-1.2(Vela Jr.)的膨胀率、年龄和距离

On the Expansion Rate, Age, and Distance of the Supernova Remnant G266.2-1.2 (Vela Jr.)

G. E. Allen, K. Chow, T. DeLaney, M. D. Filipovic, J. C. Houck, T. G. Pannuti, M. D. Stage

摘要:

对钱德拉ACIS数据的分析表明,G266.2-1.2西北边缘的两个相对明亮和狭窄的部分(也称为G266.2-1.2)。RX J0852.0-4622或Vela Jr.)揭示了2003年至2008年间2.40 +/- 0.56弧秒的径向位移的证据。相应的膨胀率(0.42 +/- 0.10 arcsec/yr或13.6 +/- 4.2%/kyr)约为XMM-牛顿数据分析报告的速率的一半,该数据来自相似但不相同的边缘部分,时间间隔相似但不相同(0.84 +/- 0.23 arcsec/yr,Katsuda等人,2008 a)。如果钱德拉速率代表了整个残余物,那么流体动力学分析的结果表明,如果G266.2-1.2膨胀到均匀的环境介质中(无论它是否由Ia型或II型事件产生),它的年龄在2.4到5.1 kyr之间。如果这些残骸是由稳定的恒星风扩散到物质中,那么年龄可能会高出50%。钱德拉膨胀率和激波速度大于或等于1000 km/s的要求产生了0.5 kpc的距离下限。对先前公布的距离估计和限制的分析表明,G266.2-1.2不超过1.0千秒差距。这一距离范围与船帆座分子脊中两组物质中较近的一组(0.7 +/- 0.2 kpc,Liseau等,1992)和船帆座OB 1组合(0.8 kpc,Eggen,1982)的距离一致。

英文摘要:

An analysis of Chandra ACIS data for two relatively bright and narrow portions of the northwestern rim of G266.2-1.2 (a.k.a. RX J0852.0-4622 or Vela Jr.) reveal evidence of a radial displacement of 2.40 +/- 0.56 arcsec between 2003 and 2008. The corresponding expansion rate (0.42 +/- 0.10 arcsec/yr or 13.6 +/- 4.2%/kyr) is about half the rate reported for an analysis of XMM-Newton data from a similar, but not identical, portion of the rim over a similar, but not identical, time interval (0.84 +/- 0.23 arcsec/yr, Katsuda et al. 2008a). If the Chandra rate is representative of the remnant as a whole, then the results of a hydrodynamic analysis suggest that G266.2-1.2 is between 2.4 and 5.1 kyr old if it is expanding into a uniform ambient medium (whether or not it was produced by a Type Ia or Type II event). If the remnant is expanding into the material shed by a steady stellar wind, then the age could be as much as 50% higher. The Chandra expansion rate and a requirement that the shock speed be greater than or equal to 1000 km/s yields a lower limit on the distance of 0.5 kpc. An analysis of previously-published distance estimates and constraints suggests G266.2-1.2 is no further than 1.0 kpc. This range of distances is consistent with the distance to the nearer of two groups of material in the Vela Molecular Ridge (0.7 +/- 0.2 kpc, Liseau et al. 1992) and to the Vel OB1 association (0.8 kpc, Eggen 1982).

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。

↑