期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 71, 期 3, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psz036
关键词
ISM: individual (G306.3-0.9); ISM: supernova remnants; X-rays: ISM
资金
- Suzaku team
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [15K17657, 26800102, 18J01417, 15K05107, 15H02090, 25109004]
- Hitomi team
- XRISM project at NASA/Goddard Space Flight Center
- Grants-in-Aid for Scientific Research [26800102, 18J01417, 15K17657, 25109004, 15H02090, 15K05107] Funding Source: KAKEN
We present a 190 ks observation of the Galactic supernova remnant (SNR) G306.3-0.9 with Suzaku. To study ejecta properties of this possible Type Ia SNR, the absolute energy-scale at the Fe-K band was calibrated to a level of uncertainty less than 10 eV by a cross-calibration with the Hitomi microcalorimeter using the Perseus cluster spectra. This enabled us for the first time to determine the ionization state of the Fe K alpha line of this SNR accurately. The ionization time-scale (tau) of the Fe ejecta was measured to be log(10)tau (cm(-3) s) = 10.24 +/- 0.03, significantly smaller than previous measurements. Marginally detected K alpha lines of Cr and Mn have ionization time-scales consistent with that of Fe. The global spectrum was well-fitted with shocked interstellar matter (ISM) and at least two ejecta components with different ionization time-scales for Fe and intermediate mass elements (IME) such as S and Ar. One plausible interpretation of the one-order-of-magnitude shorter time-scale of Fe than that of IME (log(10) tau = 11.17 +/- 0.07) is a chemically stratified structure of ejecta. By comparing the X-ray absorption column to the H I distribution decomposed along the line of sight, we refined the distance to similar to 20 kpc. The large ISM-to-ejecta shocked mass ratio of similar to 100 and dynamical time-scale of similar to 6 kyr place the SNR in the late Sedov phase. These properties are consistent with a stratified ejecta structure that has survived the mixing processes expected in an evolved SNR.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据