Star-forming content of the giant molecular filaments in the Milky Way
Star-forming content of the giant molecular filaments in the Milky Way
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银河系中巨型分子丝的恒星形成内容
DOI：
10.1051/0004-6361/201732400
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发表时间：
2018-11
影响因子：
6.5
通讯作者：
Henning Thomas
中科院分区：
文献类型：
--
作者：
Zhang Miaomiao;Kainulainen Jouni;Mattern Michael;Fang Min;Henning Thomas
上下文。通过观测，在银河系中发现了许多巨大的分子细丝（GMFs）。它们在银河系恒星形成和星系尺度致密气体演化中的作用尚不清楚。
Context. Through observations numerous giant molecular filaments (GMFs) have been discovered in the Milky Way. Their role in the Galactic star formation and Galaxy-scale evolution of dense gas is unknown.
Aims. We investigate systematically the star-forming content of all currently known GMFs. This allows us to estimate the star formation rates (SFRs) of the GMFs and to establish relationships between the SFRs and the GMF properties.
Methods. We identified and classified the young stellar object (YSO) population of each GMF using multiwavelength photometry from near- to far-infrared. We estimated the total SFRs assuming a universal and fully sampled initial mass function and luminosity function.
Results. We uniformly estimate the physical properties of 57 GMFs. The GMFs show correlations between the 13CO line width, mass, and size, similar to Larson’s relations. We identify 36 394 infrared excess sources in 57 GMFs and obtain SFRs for 46 GMFs. The median SFR surface density (ΣSFR) and star formation efficiency (SFE) of GMFs are 0.62 M⊙ Myr−1 pc−2 and 1%, similar to the nearby star-forming clouds. The star formation rate per free-fall time of GMFs is between 0.002−0.05 with the median value of 0.02. We also find a strong correlation between SFR and dense gas mass that is defined as gas mass above a visual extinction of 7 mag, which suggests that the SFRs of the GMFs scale similarly with dense gas as those of nearby molecular clouds. We also find a strong correlation between the mean SFR per unit length and dense gas mass per unit length. The origin of this scaling remains unknown, calling for further studies that can link the structure of GMFs to their SF activity and explore the differences between GMFs and other molecular clouds.
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DOI：
10.1088/0004-6256/149/2/64
发表时间：
2014-12
期刊：
The Astronomical Journal
影响因子：
--
作者：
R. Gutermuth;M. Heyer
通讯作者：
R. Gutermuth;M. Heyer
影响因子：
4.8
作者：
R. Larson
通讯作者：
R. Larson
DOI：
10.1088/0004-6256/136/6/2413
发表时间：
2008-09
期刊：
The Astronomical Journal
影响因子：
--
作者：
T. Robitaille;M. Meade;B. Babler;B. Whitney;K. Johnston;R. Indebetouw;M. Cohen;M. Povich;M. Sewiło;R. Benjamin;E. Churchwell
通讯作者：
T. Robitaille;M. Meade;B. Babler;B. Whitney;K. Johnston;R. Indebetouw;M. Cohen;M. Povich;M. Sewiło;R. Benjamin;E. Churchwell
DOI：
10.1111/j.1365-2966.2007.12040.x
发表时间：
2006-04
影响因子：
4.8
作者：
A. Lawrence;S. Warren;O. Almaini;A. Edge;N. Hambly;R. Jameson;P. Lucas;M. Casali;A. Adamson
通讯作者：
A. Lawrence;S. Warren;O. Almaini;A. Edge;N. Hambly;R. Jameson;P. Lucas;M. Casali;A. Adamson
DOI：
10.1086/524722
发表时间：
2007-10
期刊：
The Astrophysical Journal
影响因子：
--
作者：
R. Gutermuth;P. Myers;S. T. Megeath;L. Allen;J. Pipher;J. Muzerolle;Alicia Porras;E. Winston
通讯作者：
R. Gutermuth;P. Myers;S. T. Megeath;L. Allen;J. Pipher;J. Muzerolle;Alicia Porras;E. Winston