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Related papers: Spatial Statistics in Star Forming Regions: Is Sta…

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In contrast to most other galaxies, star-formation rates in the Milky Way can be estimated directly from Young Stellar Objects (YSOs). In the Central Molecular Zone (CMZ) the star-formation rate calculated from the number of YSOs with 24…

Solar and Stellar Astrophysics · Physics 2015-06-23 Christine M. Koepferl , Thomas P. Robitaille , Esteban F. E. Morales , Katharine G. Johnston

Describing how the properties of the interstellar medium combine across size-scales is crucial for understanding star formation scaling laws and connecting Galactic and extragalactic data of molecular clouds. We describe how the statistical…

Astrophysics of Galaxies · Physics 2021-09-15 Andri Spilker , Jouni Kainulainen , Jan Orkisz

The central kpc of the Milky Way might be expected to differ significantly from the rest of the Galaxy with regard to gas dynamics and the formation of YSOs. We probe this possibility with mid-infrared observations obtained with IRAC and…

Astrophysics of Galaxies · Physics 2009-08-21 F. Yusef-Zadeh , J. W. Hewitt , R. G. Arendt , B. Whitney , G. Rieke , M. Wardle , J. L. Hinz , S. Stolovy , C. C. Lang , M. G. Burton , S. Ramirez

We present maps of 4 galactic giant molecular clouds (GMCs) in the J=2-1 emission of both CO and $^{13}$CO. We use an LTE analysis to derive maps of the CO excitation temperature and column density and the distribution of total molecular…

Astrophysics of Galaxies · Physics 2022-09-13 John H. Bieging , Shuo Kong

Background: low-mass stars are the dominant product of the star formation process, and they trace star formation over the full range of environments, from isolated globules to clusters in the central molecular zone. In the past two decades,…

In this paper, we investigate the extent to which observations of molecular clouds can correctly identify and measure star-forming clumps. We produced a synthetic column density map and a synthetic spectral-line data cube from the simulated…

Astrophysics of Galaxies · Physics 2012-08-23 Rachel L. Ward , James Wadsley , Alison Sills , Nicolas Petitclerc

The main aim of this paper is to study both the Interstellar Medium (ISM) and the young stellar population in the three star-forming regions, namely IRAS 05137+3919, 05168+3634, and 19110+1045. The study of the ISM includes determination of…

Astrophysics of Galaxies · Physics 2024-04-09 Naira Azatyan

Massive stars are very rare, but their extreme luminosities make them both the only type of young star we can observe in distant galaxies and the dominant energy sources in the universe today. They form rarely because efficient radiative…

Astrophysics · Physics 2009-11-13 Mark R. Krumholz , Christopher F. McKee

The expansion of HII regions can trigger the formation of stars. An overdensity of young stellar objects (YSOs) is observed at the edges of HII regions but the mechanisms that give rise to this phenomenon are not clearly identified.…

We investigate the relation between star formation rate (SFR) and gas surface densities in Galactic star forming regions using a sample of YSOs and massive clumps. Our YSO sample consists of objects located in 20 molecular clouds from the…

Astrophysics of Galaxies · Physics 2015-05-19 Amanda Heiderman , Neal J. Evans , Lori E. Allen , Tracy Huard , Mark Heyer

Understanding the characteristics of young stellar populations is essential for deriving insights into star formation processes within parent molecular clouds and the influence of massive stars. This study focuses on YSOs in the G…

Astrophysics of Galaxies · Physics 2024-06-10 N. Azatyan , E. Nikoghosyan , A. Samsonyan , D. Elia , L. Kaper , A. Yeghikyan , D. Andreasyan , D. Baghdasaryan

There is much debate on how high-mass star formation varies with environment, and whether the sparsest star-forming environments are capable of forming massive stars. To address this issue, we have observed eight apparently isolated OB…

Astrophysics of Galaxies · Physics 2015-05-20 J. B. Lamb , M. S. Oey , J. K. Werk , L. D. Ingleby

Observations of the spatial distributions of young stars in star-forming regions can be linked to the theory of clustered star formation using spatial statistical methods. The MYStIX project provides rich samples of young stars from the…

In this paper we investigate the level of star formation activity within nearby molecular clouds. We employ a uniform set of infrared extinction maps to provide accurate assessments of cloud mass and structure and compare these with…

Astrophysics of Galaxies · Physics 2015-05-19 Charles J. Lada , Marco Lombardi , João F. Alves

The Serpens Molecular Cloud is one of the most active star-forming regions within 500 pc, with over one thousand of YSOs at different evolutionary stages. The ages of the member stars inform us about the star formation history of the cloud.…

Solar and Stellar Astrophysics · Physics 2022-07-20 Xingyu Zhou , Gregory J. Herczeg , Yao Liu , Min Fang , Michael Kuhn

The physical conditions in molecular clouds control the nature and rate of star formation, with consequences for planet formation and galaxy evolution. The focus of this review is on the conditions that characterize regions of star…

Astrophysics · Physics 2009-10-31 Neal J. Evans

Massive stars play an important role in the Universe. Unlike low-mass stars, the formation of these objects located at great distances is still unclear. It is expected to be governed by some combination of self-gravity, turbulence, and…

Astrophysics of Galaxies · Physics 2024-08-07 A. G. Pazukhin , I. I. Zinchenko , E. A. Trofimova

We investigate the correlation between CO and HI emission in 18 nearby galaxies from the CARMA Survey Toward IR-Bright Nearby Galaxies (STING) at sub-kpc and kpc scales. Our sample, spanning a wide range in stellar mass and metallicity,…

Massive stars play a pivotal role in shaping their galactic surroundings due to their high luminosity and intense ionizing radiation. However, the precise mechanisms governing the formation of massive stars remain elusive. Complex organic…

The paper aims to study relation between the distributions of the young stellar objects (YSOs) of different ages and the gas-dust constituents of the S254-S258 star-formation complex. This is necessary to study the time evolution of the YSO…