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arXiv 2004.13200astro-ph.GAastro-ph.HE
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M83的新射电星表:超新星遗迹和H II区

A New Radio Catalogue for M83: Supernova Remnants and H II Regions

Thomas D. Russell, Richard L. White, Knox S. Long, William P. Blair, Roberto Soria, P. Frank Winkler

摘要:

本文提出了一个新的正面螺旋星系M83的射电源目录。在2011年、2015年和2017年,澳大利亚望远镜紧凑阵列(ATCA)在5.5和9 GHz的频率下进行了射电观测,发现了270个射电源。虽然这些源中有一小部分是背景河外源,但大多数都是M83内部的H II区或超新星遗迹(SNRs)。六颗历史超新星中的三颗被发现,以及最近一项研究中发现的非常年轻的遗迹,这可能是过去100年爆发的超新星爆炸的结果,但被错过了。所有这些物体通常都会随着时间而褪色。混乱限制了我们测量M83中一些SNR的无线电发射的能力,但在未混淆的区域中检测到64个SNR,并且这些SNR具有在其他星系中观察到的近似幂律光度函数。M83中的信噪比系统地比M33中的射电波长探测到的信噪比更小,更亮。一些射电源与M83中的X射线源重合;这些重合源中的大多数被证明是超新星遗迹。我们的双频观测是迄今为止对本星系群之外的螺旋星系最敏感的观测之一;尽管如此,我们无法对光谱指数进行实际限制,因此,不可能仅根据其射电性质来搜索超新星遗迹。

英文摘要:

We present a new catalogue of radio sources in the face-on spiral galaxy M83. Radio observations taken in 2011, 2015, and 2017 with the Australia Telescope Compact Array (ATCA) at 5.5 and 9 GHz have detected 270 radio sources. Although a small number of these sources are background extragalactic sources, most are either H II regions or supernova remnants (SNRs) within M83 itself. Three of the six historical supernovae are detected, as is the very young remnant that had been identified in a recent study, which is likely the result of a supernova that exploded in the last ~100 years but was missed. All of these objects are generally fading with time. Confusion limits our ability to measure the radio emission from a number of the SNRs in M83, but 64 were detected in unconfused regions, and these have the approximate power-law luminosity function which has been observed in other galaxies. The SNRs in M83 are systematically smaller in diameter and brighter than those that have been detected at radio wavelengths in M33. A number of the radio sources are coincident with X-ray sources in M83; most of these coincident sources turn out to be supernova remnants. Our dual frequency observations are among the most sensitive to date for a spiral galaxy outside the Local Group; despite this we were not able to place realistic constraints on the spectral indices, and as a result, it was not possible to search for supernova remnants based on their radio properties alone.

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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