在安德罗米达星系中出现的新星超级残留物
M J Darnley1, R Hounsell2,3,4, T J O'Brien5
1Astrophysics Research Institute, Liverpool John Moores University, Liverpool, UK. m.j.darnley@ljmu.ac.uk.
Nature
|January 11, 2019
概括
安德罗米达星系中经常出现的新星M31N 2008-12a被一个巨大的外所包围,这表明数百万年的频繁爆发. 这种超级残留物比大多数超新星残留物更大,
科学领域:
- 天文学与天体物理学
- 恒星进化
- 银河系动力学
背景情况:
- 经典的新星是白矮星上积的结果,导致热核逃跑和质量喷射.
- 经常出现的新星是在较短的时间尺度上出现的,它们是白矮星双星系统,具有快速的积累率.
- 新星的喷射会扫荡星际介质,形成空洞,但单次喷发的巨大残留物是未知的.
研究的目的:
- 调查新星爆发的残留物存在和规模.
- 为了确定频繁,连续的喷发能产生大规模的结构.
- 分析每年爆发的新星M31N 2008-12a.
主要方法:
- 使用成像和光谱数据的观测天文学.
- 围绕M31N 2008-12a的喷射物的空间范围和形态的分析.
- 观察到的残骸大小与理论模型和已知的超新星残骸的比较.
主要成果:
- 发现一个围绕M31N 2008-12a反复出现的超级残留物.
- 预计残留物大小至少为134x90帕塞克.
- 这个结构比单个新星喷发和大多数超新星残留物大得多.
结论:
- 这种超级残余的存在证实M31N 2008-12a已经在数百万年里频繁地爆发.
- 反复出现的新星可以在长时间内产生巨大的外,塑造星际介质.
- 这一发现突显了反复出现的新星对其银河系环境的重大累积影响.
相关概念视频
Super-resolution Fluorescence Microscopy
14.5K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
14.5K
Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes
16.0K
The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
16.0K


