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arXiv 1702.03282astro-ph.GA
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超风演化:年轻的恒星暴驱动的风星系NGC 2782

Superwind evolution: the young starburst-driven wind galaxy NGC 2782

Jimena Bravo-Guerrero, Ian R. Stevens

摘要:

本文给出了对重要的星暴星系NGC 2782在0.3- 10 keV能量带的30 ksec Chandra观测结果。我们发现了小范围超级风的证据,这可能处于发展的早期阶段。我们发现了一个区域内的半径2 $D_{25}$的星系中心,这是可能与星系共27个X射线点源。其中,13个是ULX($L_{X}\geq 10^{39}~ erg s ^{-1}$),并且一些可能具有对应物。ULX候选物的X射线光度为$1.2-3.9\times10^{39}~ erg s ^{-1}$。NGC 2782似乎具有异常大量的ULX。中心扩散X射线辐射从核区延伸到~ 3 kpc。我们还发现了一个X射线结构的南部的核,符合Hα丝和一个5 GHz的射电源。我们将其解释为形成超级风的吹出区域。这个X射线泡的总光度(0.3-10 keV)为$5\times10^{39}erg s ^{-1}$(大约是扩展发射的总光度的$15\%$),推断风质量为$1.5\times10^{6}$ M $_\odot$。我们还讨论了NGC 2782中心X射线源的性质,认为它可能是一个低光度活动星系核(LLAGN),其X射线总光度为$L_{X}=6\times10^{40}~erg s ^{-1}$,并伴有6.4 keV的强Fe线发射。

英文摘要:

We present results from a 30 ksec Chandra observation of the important starburst galaxy NGC 2782, covering the 0.3-10keV energy band. We find evidence of a superwind of small extent, that is likely in an early stage of development. We find a total of 27 X-ray point sources within a region of radius 2$D_{25}$ of the galaxy centre and which are likely associated with the galaxy. Of these, 13 are ULXs ($L_{X}\geq 10^{39}~ erg s ^{-1}$) and a number have likely counterparts. The X-ray luminosities of the ULX candidates are $1.2-3.9\times10^{39}~ erg s ^{-1}$. NGC2782 seems to have an unusually large number of ULXs. Central diffuse X-ray emission extending to ~ 3kpc from the nuclear region has been detected. We also find an X-ray structure to the south of the nucleus, coincident with Hα filaments and with a 5 GHz radio source. We interpret this as a blow-out region of a forming superwind. This X-ray bubble has a total luminosity (0.3-10 keV) of $5\times10^{39}erg s ^{-1}$ (around $15\%$ of the total luminosity of the extended emission), and an inferred wind mass of $1.5\times10^{6}$ M$_\odot$. We also discuss the nature of the central X-ray source in NGC2782, and conclude that it is likely a low-luminosity AGN (LLAGN), with a total X-ray luminosity of $L_{X}=6\times10^{40}~erg s ^{-1}$ with strong Fe line emission at 6.4 keV.

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。

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