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We present broad-band (U, V, I,and H) and narrow-band(H-alpha+[N II] and Paschen-alpha) images of the circumnuclear starburst rings in two nearby spiral galaxies, NGC 1512 and NGC 5248, obtained with WFPC2 and NICMOS on HST. Combined with…

Astrophysics · Physics 2009-11-06 Dan Maoz , Aaron J. Barth , Luis C. Ho , Amiel Sternberg , Alexei V. Filippenko

Star clusters represent the most common 'mode' of star formation. They are found in all types of environments, cascading down from galaxy groups and merging pairs through starbursts to normal galaxies and dwarves and even isolated regions…

Astrophysics of Galaxies · Physics 2011-10-05 Iraklis S Konstantopoulos

Studies of the Galactic Centre suggest that in-situ star formation may have given rise to the observed stellar population near the central supermassive black hole (SMBH). Direct evidence for a recent starburst is provided by the currently…

In the first few Myr the massive stars dynamically interact, produce runaways and affect the initial binary population. Observing and interpreting the dynamics of young massive clusters is key to our understanding of the star formation…

Astrophysics of Galaxies · Physics 2023-02-15 Mitchel Stoop , Lex Kaper , Alex de Koter , Difeng Guo , Henny J. G. L. M. Lamers , Steven Rieder

It has been suggested that the compact open cluster VdBH 222 is a young massive distant object. We set out to characterise VdBH 222 using a comprehensive set of multi-wavelength observations. We obtained multi-band optical (UBVR) and…

Solar and Stellar Astrophysics · Physics 2014-09-05 A. Marco , I. Negueruela , C. González-Fernández , J. Maíz Apellániz , R. Dorda , J. S. Clark

Surface brightness profiles for 23 M31 star clusters were measured using images from the Wide Field Planetary Camera 2 on the Hubble Space Telescope, and fit to two types of models to determine the clusters' structural properties. The…

Astrophysics of Galaxies · Physics 2011-01-07 P. Barmby , S. Perina , M. Bellazzini , J. G. Cohen , P. W. Hodge , J. P. Huchra , M. Kissler-Patig , T. H. Puzia , J. Strader

We present comprehensive characterization of the Galactic open cluster M 36. Some two hundred member candidates, with an estimated contamination rate of $\sim$8%, have been identified on the basis of proper motion and parallax measured by…

Astrophysics of Galaxies · Physics 2021-04-07 Alik Panja , Wen Ping Chen , Somnath Dutta , Yan Sun , Yu Gao , Soumen Mondal

(Abridged) We study the nuclear star clusters in spiral galaxies of various Hubble types using spectra obtained with STIS on-board HST. We observed the nuclear clusters in 40 galaxies, selected from two previous HST/WFPC2 imaging surveys.…

We study in detail the properties of the stellar populations of 111 massive ($\log(M_{\star}/\mathrm{M}_\odot) \ge 10)$ dusty (FIR-selected) starburst ($SFR/SFR_\mathrm{MS}>2$) galaxies at $0.7<z<1.2$. For that purpose, we use…

Astrophysics of Galaxies · Physics 2022-03-24 Néstor Espino-Briones , Pablo G. Pérez-González , Jaime Zamorano , Lucía Rodríguez-Muñoz

We examine the spatial distribution of star clusters in NGC 628 using the statistical tool INDICATE to quantify clustering tendencies. Our sample, based on HST and JWST observations, is the most complete to date, spanning ages from 1 Myr to…

We measure the projected half-light radii of young star clusters in 31 galaxies from the Legacy Extragalactic UV Survey (LEGUS). We implement a custom pipeline specifically designed to be robust against contamination, which allows us to…

Astrophysics of Galaxies · Physics 2021-10-20 Gillen Brown , Oleg Y. Gnedin

We study the dynamical state and properties of galaxies and groups in the supercluster SClA2142 that has a collapsing core, to understand its possible formation and evolution. We find the substructure of galaxy groups using normal mixture…

Cosmology and Nongalactic Astrophysics · Physics 2018-12-12 Maret Einasto , Mirt Gramann , Changbom Park , Juhan Kim , Boris Deshev , Elmo Tempel , Pekka Heinämäki , Heidi Lietzen , Anne Lähteenmäki , Jaan Einasto , Enn Saar

During the last $\sim$ 30 Myr the nuclear stellar disk in the Galactic center has been the most prolific star forming region of the Milky Way when averaged by volume. Remarkably, the combined mass of the only three clusters present today in…

Astrophysics of Galaxies · Physics 2023-09-13 Á. Martínez-Arranz , R. Schödel , F. Nogueras-Lara , M. Hosek , F. Najarro

The clusters of young stars in massive star-forming regions show a wide range of sizes, morphologies, and numbers of stars. Their highly subclustered structures are revealed by the MYStIX project's sample of 31,754 young stars in nearby…

Deep near-infrared images recorded with NICI on Gemini South are used to investigate the evolved stellar content in the outer regions of the south east quadrant of the spiral galaxy M83. A diffuse population of asymptotic giant branch (AGB)…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 T. J. Davidge

We present near infrared imaging and integral field spectroscopy of the centre of the dusty luminous infrared galaxy merger MCG+08-11-002, taken using the Near InfraRed Camera 2 (NIRC2) and the OH-Suppressing InfraRed Imaging Spectrograph…

Astrophysics of Galaxies · Physics 2016-02-24 Rebecca L. Davies , Anne M. Medling , Vivian U , Claire E. Max , David Sanders , Lisa. J. Kewley

We present a survey of 130 Galactic and extragalactic young massive clusters (YMCs, $10^4 < M/\msun < 10^8$, $10 < t/{\rm Myr} < 1000$) with integrated spectroscopy or resolved stellar photometry (40 presented here and 90 from the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 N. Bastian , I. Cabrera-Ziri , B. Davies , S. S. Larsen

Aim: We aim to estimate the age and reddening parameters of already identified star clusters within the Small Magellanic Cloud (SMC) in a consistent way using available photometric data, classify them based on their mass and strength, and…

Astrophysics of Galaxies · Physics 2018-09-12 P. K. Nayak , A. Subramaniam , S. Choudhury , Ram Sagar

The present paper presents a tabulation of data on all 600 Galactic open clusters for which it is presently possible to calculate linear diameters. As expected, the youngest `clusters' with ages < 15 Myr, contain a significant (greater than…

Astrophysics · Physics 2008-11-26 Sidney van den Bergh

An overview of our current understanding of the formation and evolution of star clusters is given, with main emphasis on high-mass clusters. Clusters form deeply embedded within dense clouds of molecular gas. Left-over gas is cleared within…

Astrophysics of Galaxies · Physics 2015-05-14 Soeren S. Larsen