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arXiv 2602.20786astro-ph.GAastro-ph.COastro-ph.HE
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近邻恒星burst星系M 82的多波段研究

A multi-wavelength study of nearby starburst galaxy M 82

Maharashtra Udayagiri Mahavidyalaya(马哈拉施特拉乌达吉里学院);North-West University(西北大学);Swami Ramanand Teerth Marathawada University(斯瓦米·拉马南德·特思马拉塔瓦达大学);Physical Research Laboratory(物理研究实验室);National Institute for Theoretical and Computational Sciences (NITheCS)(国家理论计算科学研究所)

Nilkanth Vagshette, Satish S. Sonkamble, Madhav Patil, Sachindra Naik, Ilani Loubser

AI总结:

通过结合紫外和X射线观测,研究M 82的恒星形成率及金属丰度,揭示尘埃遮蔽效应和星流演化。

摘要:

我们通过结合AstroSat上的紫外成像望远镜(UVIT)提供的高分辨率远紫外(FUV)成像和归档的ChandraX射线观测,对近邻恒星burst星系M 82进行了多波段研究。利用FUV流量测量,我们估计了几个恒星形成团块内不同半径(约3.6kpc)的恒星形成率(SFR)。总SFR为0.022M_\odot yr^{-1}。H_α重组线流量给出SFR为约0.010M_\odot yr^{-1},而基于24μm发射的红外SFR显著更高,达到16-18M_\odot yr^{-1},表明M 82中相当大的恒星形成被尘埃遮蔽。FUV、H_α、中红外和软X射线发射的形态比较揭示了强空间相关性,追踪沿星系次轴的多相喷流。利用三温度VAPEC模型的X射线光谱分析显示Ne、Mg、Si和S的增强,与II型超新星的富集一致。这些结果表明,结合紫外、光学、红外和X射线观测对于探测被遮蔽和未被遮蔽的恒星形成、金属富集以及由喷流驱动的恒星burst星系演化至关重要。

英文摘要:

We present a multi-wavelength study of the nearby starburst galaxy M 82 by combining high-resolution Far-ultraviolet (FUV) imaging from the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat and archival Chandra X-ray observations. Using FUV flux measurements, we estimate a spatially-resolved star formation rate (SFR) across several star-forming clumps within a radius of $\sim$3.6 kpc, finding a total SFR of 0.022 M$_{\odot}$ yr$^{-1}$. The H$_α$ recombination line flux yields an SFR of $\sim$0.010 M$_{\odot}$ yr$^{-1}$, while the infrared-based SFR derived from 24 $μ\mathrm{m}$ emission is significantly higher at 16 - 18 M$_{\odot}$ yr$^{-1}$, suggesting that a substantial fraction of star formation in M 82 is heavily dust-obscured. Morphological comparison of FUV, H$_α$, mid-infrared, and soft X-ray emission reveals a strong spatial correlation, tracing multi-phase outflows along the galaxy's minor axis. X-ray spectral analysis using a three-temperature $\texttt{VAPEC}$ model shows enhanced abundances of Ne, Mg, Si, and S, consistent with enrichment from Type-II supernovae. These results demonstrate the importance of combining UV, optical, IR, and X-ray observations to probe both obscured and unobscured star formation, the metal enrichment, and the outflow-driven evolution of starburst galaxies.

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