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In the local Universe, there is a handful of dwarf compact star-forming galaxies with extremely low oxygen abundances. It has been proposed that they are young, having formed a large fraction of their stellar mass during their last few…

星系天体物理 · 物理学 2021-03-03 M. Trevisan , G. A. Mamon , T. X. Thuan , F. Ferrari , L. S. Pilyugin , A. Ranjan

We report the possible discovery of a new stellar system (YMCA-1), identified during a search for small scale overdensities in the photometric data of the YMCA survey. The object's projected position lies on the periphery of the Large…

In the hierarchical view of star formation, giant molecular gas clouds (GMCs) undergo fragmentation to form small-scale structures made up of stars and star clusters. Here we study the connection between young star clusters and cold gas…

Young massive star clusters (YMSCs) have been proposed as excellent candidates for the main sources of Galactic cosmic rays (CRs) up to the PeV range. The detection and study of gamma rays in the very-high-energy (E>100GeV) range has…

高能天体物理现象 · 物理学 2026-05-11 Rowan Batzofin , Pierre Cristofari , Kathrin Egberts

The work of Adamo et al. (2015) showed that the mass distributions of young massive stellar clusters were truncated above a maximum-mass scale in the nearby galaxy M83 and that this truncation mass varies with galactocentric radius. Here,…

星系天体物理 · 物理学 2017-04-19 Pamela Freeman , Erik Rosolowsky , J. M. Diederik Kruijssen , Nate Bastian , Angela Adamo

We investigate the dissolution process of young embedded star clusters with different primordial mass segregation levels using fractal distributions by means of N-body simulations. We combine several star clusters in virial and subvirial…

星系天体物理 · 物理学 2021-09-29 R. Domínguez , J. P. Farias , M. Fellhauer , Ralf S. Klessen

Star formation on galactic scales is known to be a slow process, but whether it is slow on smaller scales is uncertain. We cross-correlate 5469 giant molecular clouds (GMCs) from a new all-sky catalog with 256 star forming complexes (SFCs)…

星系天体物理 · 物理学 2016-12-28 Eve J. Lee , Marc-Antoine Miville-Deschenes , Norman Murray

We categorized clumps, embedded clusters, and open clusters and conducted a comparative analysis of their physical properties. Overall, the radii of open clusters are significantly larger than those of embedded clusters and clumps. The…

星系天体物理 · 物理学 2024-10-29 J. W. Zhou , Sami Dib , Pavel Kroupa

Clouds more massive than about $10^5$ M$_\odot$ are potential sites of massive cluster formation. Studying the properties of such clouds in the early stages of their evolution offers an opportunity to test various cluster formation…

星系天体物理 · 物理学 2023-03-10 Vineet Rawat , M. R. Samal , D. L. Walker , A. Zavagno , A. Tej , G. Marton , D. K. Ojha , Davide Elia , W. P. Chen , J. Jose , C Eswaraiah

Star formation is a hierarchical process, forming young stellar structures of star clusters, associations, and complexes over a wide scale range. The star-forming complex in the bar region of the Large Magellanic Cloud is investigated with…

Globular clusters (GCs) are thought to be ancient relics from the early formative phase of galaxies, although their physical origin remains uncertain. GCs are most numerous around massive elliptical galaxies, where they can exhibit a broad…

星系天体物理 · 物理学 2020-10-13 Jeremy Lim , Emily Wong , Youichi Ohyama , Tom Broadhurst , Elinor Medezinski

We revisit the hypothesis that dense galactic nuclei are formed from inspiraling globular clusters. Recent advances in understanding of the continuous formation of globular clusters over cosmic time and the concurrent evolution of the…

宇宙学与河外天体物理 · 物理学 2015-06-16 Oleg Y. Gnedin , Jeremiah P. Ostriker , Scott Tremaine

Bressert et al. recently showed that the surface density distribution of low-mass, young stellar objects (YSOs) in the solar neighbourhood is approximately log-normal. The authors conclude that the star formation process is hierarchical and…

星系天体物理 · 物理学 2015-06-05 Mark Gieles , Nick Moeckel , Cathie J. Clarke

Galactic nuclei often harbor a disproportionately large amount of star formation activity with respect to their surrounding disks. Not coincidentally, the density of molecular material in galactic nuclei is often also much greater than that…

天体物理学 · 物理学 2007-05-23 Donald F. Figer , Mark Morris

N-body simulations are used to model the early evolution of globular clusters. These simulations include residual gas which was not turned into stars which is expelled from the globular cluster by the actions of massive stars. The results…

天体物理学 · 物理学 2015-06-24 Simon P Goodwin

In the local Universe, the existence of very young galaxies (VYGs), having formed at least half their stellar mass in the last 1 Gyr, is debated. We predict the present-day fraction of VYGs among central galaxies as a function of galaxy…

During the last two decades, the focus of star formation research has shifted from understanding the collapse of a single dense core into a star to studying the formation hundreds to thousands of stars in molecular clouds. In this chapter,…

天体物理学 · 物理学 2008-01-04 S. T. Megeath , Zhi-Yun Li , Aake Nordlund

We present a global study of low mass, young stellar object (YSO) surface densities in nearby (< 500 pc) star forming regions based on a comprehensive collection of Spitzer Space Telescope surveys. We show that the distribution of YSO…

The mass fraction of dense gas within giant molecular clouds (GMCs) of the Milky Way is investigated using 13CO data from the FCRAO Galactic Plane Surveys and the Bolocam Galactic Plane Survey (BGPS) of 1.1 mm dust continuum emission. A…

星系天体物理 · 物理学 2015-06-18 Andrew J. Battisti , Mark H. Heyer

Current observations favour that the massive ultraviolet-bright clumps with a median stellar mass of $\sim 10^7~M_{\odot}$, ubiquitously observed in $z\sim 1-3$ galaxies, are star-forming regions formed in-situ in galaxies. It has been…