arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2209.01389astro-ph.GA
收藏

三角座星系M 33恒星形成和反馈的云尺度射电巡天:VLA观测

Cloud-scale Radio Surveys of Star Formation and Feedback in Triangulum Galaxy M 33: VLA Observations

F. S. Tabatabaei, W. Cotton, E. Schinnerer, R. Beck, A. Brunthaler, K. M. Menten, J. Braine, E. Corbelli, C. Kramer, J. E. Beckman, J. H. Knapen, R. Paladino, E… 展开作者

F. S. Tabatabaei, W. Cotton, E. Schinnerer, R. Beck, A. Brunthaler, K. M. Menten, J. Braine, E. Corbelli, C. Kramer, J. E. Beckman, J. H. Knapen, R. Paladino, E. Koch, A. Camps Farina

摘要:

研究大质量恒星形成和星际介质(ISM)之间的相互作用对于理解星系的演化至关重要。射电连续谱(RC)辐射是大质量恒星形成和星际介质高能成分的一种无干扰示踪剂。本文介绍了用Karl G. Jansky甚大阵列(VLA)我们校准的恒星形成率表面密度和调查的影响,漫反射辐射对这种校准使用的结构分解。分离热辐射和非热辐射成分,研究了星际介质不同相态之间的相关性以及大质量恒星形成的影响。在M33的18'× 18'(或4kpc × 4kpc)圆盘中,小于200 pc的射电源约占1.5GHz(6.3GHz)总RC辐射的36%(46%)。随着恒星形成率表面密度的增加,非热谱指数变得平坦,表明宇宙射线电子{从其出生地}逸出。磁场强度也随着恒星形成率的增加而增加,遵循双峰关系,表明小尺度湍流发电机在更高的光度和恒星形成率下更有效地起作用。虽然在恒星形成区的相关性更紧密,但非热辐射也与ISM中更静止的分子气体相关。当排除弥散结构时,M33存在几乎线性的分子星形成规律。大质量恒星的形成放大了磁场,增加了高能宇宙射线电子的数量,这有助于风和外流的开始。

英文摘要:

Studying the interplay between massive star formation and the interstellar medium (ISM) is paramount to understand the evolution of galaxies. Radio continuum (RC) emission serves as an extinction-free tracer of both massive star formation and the energetic components of the interstellar medium. We present a multi-band radio continuum survey of the local group galaxy M 33 down to ~30 pc linear resolution observed with the Karl G. Jansky Very Large Array (VLA). We calibrate the star-formation rate surface density and investigate the impact of diffuse emission on this calibration using a structural decomposition. Separating the thermal and nonthermal emission components, the correlation between different phases of the interstellar medium and the impact of massive star formation are also investigated. Radio sources with sizes <~ 200 pc constitute about 36% (46%) of the total RC emission at 1.5 GHz (6.3 GHz) in the inner 18' x 18' (or 4kpc x 4kpc) disk of M 33. The nonthermal spectral index becomes flatter with increasing star-formation rate surface density, indicating the escape of cosmic ray electrons {from their birth places}. The magnetic field strength also increases with star-formation rate following a bi-modal relation, indicating that the small-scale turbulent dynamo acts more efficiently at higher luminosities and star-formation rates. Although the correlations are tighter in star-forming regions, the nonthermal emission is correlated also with the more quiescent molecular gas in the ISM. An almost linear molecular star-formation law exists in M 33 when excluding diffuse structures. Massive star formation amplifies the magnetic field and increases the number of high-energy cosmic ray electrons, which can help the onset of winds and outflows.

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。

↑