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Large-scale star formation in disk galaxies is hypothesized to be driven by global gravitational instability. The observed gas surface density is commonly used to compute the strength of gravitational instability, but according to this…

We present result from DECam SDSS i PSF photometry of the radial stellar density profiles of the Large Magellanic Cloud (LMC) old globular clusters (GCs) NGC1841, 2210, Hodge11 and Reticulum, which extent out of ~ 380 pc from their centres.…

Astrophysics of Galaxies · Physics 2018-04-25 Andrès E. Piatti

In this paper, we study the age and spatial distributions of Cepheids in the Small Magellanic Cloud (SMC) as a function of their ages using the data from the OGLE III photometric catalogue. A period-age (PA) relation derived for the…

Astrophysics of Galaxies · Physics 2016-10-18 Yogesh C. Joshi , Auro Mohanty , Santosh Joshi

We have undertaken a detailed analysis of HST/WFPC2 and STIS imaging observations, and of supplementary wide-field ground-based observations obtained with the NTT of two young ~10-25 Myr) compact star clusters in the LMC, NGC 1805 and NGC…

Astrophysics · Physics 2009-11-07 R. de Grijs , R. A. Johnson , G. F. Gilmore , C. M. Frayn

The color-magnitude diagrams (CMDs) of young star clusters show that, particularly at ultraviolet wavelengths, their upper main sequences (MSs) bifurcate into a sequence comprising the bulk population and a blue periphery. The spatial…

Solar and Stellar Astrophysics · Physics 2021-05-12 Yujiao Yang , Chengyuan Li , Richard de Grijs , Licai Deng

Our current understanding of the stellar initial mass function and massive star evolution suggests that young globular clusters may have formed hundreds to thousands of stellar-mass black holes, the remnants of stars with initial masses…

Astrophysics of Galaxies · Physics 2015-06-22 Meagan Morscher , Bharath Pattabiraman , Carl Rodriguez , Frederic A. Rasio , Stefan Umbreit

The all-sky Milky Way Star Clusters (MWSC) survey provides uniform and precise ages and other parameters for a variety of clusters in the Solar Neighbourhood. We construct the cluster age distribution, investigate its spatial variations,…

Astrophysics of Galaxies · Physics 2018-06-13 A. E. Piskunov , A. Just , N. V. Kharchenko , P. Berczik , R. -D. Scholz , S. Reffert , S. X. Yen

The aim of this work is to test to what extent the star cluster population of a galaxy can be utilised to constrain or estimate the star formation history, with the Large Magellanic Cloud as our testbed. We follow two methods to extract…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Thomas Maschberger , Pavel Kroupa

We present the results of realistic N-body modelling of massive star clusters in the Magellanic Clouds, aimed at investigating a dynamical origin for the radius-age trend observed in these systems. We find that stellar-mass black holes,…

Astrophysics · Physics 2009-06-23 A. D. Mackey , M. I. Wilkinson , M. B. Davies , G. F. Gilmore

We investigate the properties and evolution of star particles in two simulations of isolated spiral galaxies, and two galaxies from cosmological simulations. Unlike previous numerical work, where typically each star particle represents one…

The outer northeastern region of the Small Magellanic Cloud (SMC) is populated by a shell-like overdensity whose nature was recently investigated. We analyzed twenty catalogued star clusters projected onto it from Survey of the MAgellanic…

Astrophysics of Galaxies · Physics 2021-11-17 Andrés E. Piatti

We present Washington system C,T_1 CMDs of 13 star clusters and their surrounding fields which lie in the outer parts of the LMC disk. Ages are determined by means of the magnitude difference between the giant branch clump and the turnoff,…

We present CMDs in the V and I bands for fifteen star clusters in the Small Magellanic Cloud (SMC) based on data taken with the Very Large Telescope (VLT, Chile). We selected these clusters from our previous work, wherein we derived cluster…

Solar and Stellar Astrophysics · Physics 2014-03-05 M. C. Parisi , D. Geisler , G. Carraro , J. J. Clariá , E. Costa , A. J. Grocholski , A. Sarajedini , R. Leiton , A. E. Piatti

We have used the ``dynamical clock'' to measure the level of dynamical evolution reached by three Galactic globular clusters (namely, NGC 3201, NGC 6316 and NGC 6440). This is an empirical method that quantifies the level of central…

Astrophysics of Galaxies · Physics 2023-06-28 Francesco R. Ferraro , Barbara Lanzoni , Enrico Vesperini , Mario Cadelano , Dan Deras , Cristina Pallanca

The Magellanic Clouds (MCs) present a rich system of stellar clusters that can be used to probe the dynamical and chemical evolution of these neighboring and interacting irregular galaxies. In particular, these stellar clusters (SCs)…

The star cluster (SC) age distribution of the Large Magellanic Cloud (LMC) exhibits a gap from $\sim$ 4 to 10 Gyr ago, with an almost total absence of SCs. Within this age gap, only two confirmed SCs have been identified hitherto.…

We consider tidal masses and ages of Milky Way open clusters, as well as a simple model of their distribution. Our aim is to investigate the space of model parameters and the correspondence between modelled and observed two-dimensional…

Astrophysics of Galaxies · Physics 2025-05-21 Jonathan H. Klos , Andreas Just , Evgeny V. Polyachenko , Peter Berczik , Marina Ishchenko

Colour-magnitude diagrams are presented for the first time for L32, L38, K28 (L43), K44 (L68) and L116, which are clusters projected onto the outer parts of the Small Magellanic Cloud (SMC). The photometry was carried out in the Washington…

Astrophysics · Physics 2009-11-06 A. E. Piatti , J. F. C. Santos , J. J. Claria , E. Bica , A. Sarajedini , D. Geisler

Integrated spectra have been obtained of 31 star clusters in the Magellanic Clouds (MC) and of 4 Galactic globular clusters. The spectra cover the wavelength range 3500 -- 4700 Angstroms at a resolution of 3.2 Angstroms FWHM. The MC…

Astrophysics · Physics 2007-05-23 Andrew. J. Leonardi , James. A. Rose

The Milky Way galaxy is observed to have multiple components with distinct properties, such as the bulge, disk, and halo. Unraveling the assembly history of these populations provides a powerful test to the theory of galaxy formation and…

Astrophysics of Galaxies · Physics 2015-06-05 Jason Kalirai