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Near-IR spectroscopic ages of massive star clusters in M82
A. Lançon, J. S. Gallagher, M. Mouhcine +3
Like other starburst galaxies, M82 hosts compact, massive young star clusters that are interesting both in their own right and as benchmarks for population synthesis models. Can sp…
A New Diagnostic Method for Assessment of Stellar Stratification in Star Clusters
Dimitrios A. Gouliermis, Richard de Grijs, Yu Xin
We propose a new method for the characterization of stellar stratification in stellar systems. The method uses the mean-square radius (also called the Spitzer radius) of the system…
The Magellanic Clouds as a template for the study of stellar populations and galaxy interactions
M. -R. L. Cioni, K. Bekki, G. Clementini +18
The Magellanic System represents one of the best places to study the formation and evolution of galaxies. Photometric surveys of various depths, areas and wavelengths have had a si…
The Young Star Cluster System in the Antennae: Evidence for a Turnover in the luminosity function
P. Anders, N. Bissantz, L. Boysen +2
The luminosity functions (LFs) of star cluster systems (i.e. the number of clusters per luminosity interval) are vital diagnostics to probe the conditions of star cluster formation…
Accurate photometry of extended spherically symmetric sources
P. Anders, M. Gieles, R. de Grijs
We present a new method to derive reliable photometry of extended spherically symmetric sources from {\it HST} images (WFPC2, ACS/WFC and NICMOS/NIC2 cameras), extending existing s…
The photometric evolution of dissolving star clusters I: First predictions
Henny J. G. L. M. Lamers, Peter Anders, Richard de Grijs
We calculated the broad-band photometric evolution of unresolved star clusters, including the preferential loss of low-mass stars due to mass segregation. The stellar mass function…
The initial mass distribution of the M82 star cluster system
R. de Grijs, G. Parmentier, H. J. G. L. M. Lamers
We explore whether we can constrain the shape of the INITIAL mass distribution of the star cluster population in M82's ~1 Gyr-old post-starburst region "B", in which the present-da…
Systematic uncertainties in the analysis of star cluster parameters based on broad-band imaging observations
R. de Grijs, P. Anders, H. J. G. L. M. Lamers +5
(ABRIDGED) We assess the systematic uncertainties in (young) cluster age, mass, and - to a lesser extent - extinction and metallicity determinations, based on broad-band imaging ob…
Star and cluster formation in extreme environments
Richard de Grijs
Current empirical evidence on the star-formation processes in the extreme, high-pressure environments induced by galaxy encounters (mostly based on high-resolution Hubble Space Tel…
CIRPASS near-infrared integral-field spectroscopy of massive star clusters in the starburst galaxy NGC 1140
R. de Grijs, L. J. Smith, A. Bunker +6
[ABRIDGED] We analyse near-infrared integral field spectroscopy of the central starburst region of NGC 1140, obtained at the Gemini-South telescope equipped with CIRPASS. Our ~1.45…
The Star Cluster Population of M51
M. Gieles, N. Bastian, H. J. G. L. M. Lamers
We present the age and mass distribution of star clusters in M51. The structural parameters are found by fitting cluster evolution models to the spectral energy distribution consis…
Analysing observed star cluster SEDs with evolutionary synthesis models: Systematic uncertainties
P. Anders, N. Bissantz, U. Fritze-v. Alvensleben +2
We discuss the systematic uncertainties inherent to analyses of observed (broad-band) Spectral Energy Distributions (SEDs) of star clusters with evolutionary synthesis models. We i…
Star Cluster Formation and Evolution in Nearby Starburst Galaxies: II. Initial Conditions
R. de Grijs, P. Anders, N. Bastian +3
We use the ages, masses and metallicities of the rich young star cluster systems in the nearby starburst galaxies NGC 3310 and NGC 6745 to derive their cluster formation histories…
Star Cluster Systems in Interacting and Starburst Galaxies: A Multicolour Approach
Richard de Grijs
The large majority of extragalactic star cluster studies done to date have essentially used two or three-passband aperture photometry, combined with theoretical stellar population…
Mass segregation in rich clusters in the Large Magellanic Cloud - III. Implications for the initial mass function
R. de Grijs, G. F. Gilmore, A. D. Mackey +4
The distribution of core radii of rich clusters in the Large Magellanic Cloud (LMC) systematically increases in both upper limit and spread with increasing cluster age. Cluster-to-…
Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831
L. O. Kerber, B. X. Santiago, R. Castro +1
We present the analysis of a deep colour-magnitude diagram (CMD) of NGC 1831, a rich star cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W (~V) and F814W (~I)…
On the nature of a secondary main sequence turn-off in the rich LMC cluster NGC 1868
B. Santiago, L. Kerber, R. Castro +1
Evidence for a second main-sequence turn-off in a deep colour-magnitude diagram of NGC 1868 is presented. The data were obtained with HST/WFPC2 and reach down to m_{555} ~ 25. Besi…
An HST Survey of the mid-UV Morphology of Nearby Galaxies
R. A. Windhorst, V. A. Taylor, R. A. Jansen +12
(Abbreviated) We present an imaging survey of 37 nearby galaxies observed with HST/WFPC2 in the mid-UV F300W filter and in F814W. 11 galaxies were also imaged in F255W. These galax…
Flattening and truncation of stellar discs in edge-on spiral galaxies
Michiel Kregel, Pieter C. van der Kruit, Richard de Grijs
We analyse the global structure of the old stellar discs in 34 edge-on spiral galaxies. The radial and vertical exponential scale parameters of the discs are obtained by applying a…
Mass segregation in young compact star clusters in the Large Magellanic Cloud: II. Mass Functions
R. de Grijs, G. F. Gilmore, R. A. Johnson +1
We review the complications involved in the conversion of stellar luminosities into masses and apply a range of mass-to-luminosity relations to our Hubble Space Telescope observati…
Mass segregation in young compact star clusters in the Large Magellanic Cloud: I. Data and Luminosity Functions
R. de Grijs, R. A. Johnson, G. F. Gilmore +1
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-…
A search for radio supernovae and supernova remnants in the region of NGC1569's super star clusters
A. Greve, A. Tarchi, S. Huettemeister +4
We have used MERLIN, at 1.4 and 5 GHz, to search for radio supernovae (RSNe) and supernova remnants (SNRs) in the unobscured irregular dwarf galaxy NGC1569, and in particular in th…
The Fossil Starburst in M82
Richard de Grijs, Robert W. O'Connell, John S. Gallagher +1
(Abridged) We present high-resolution HST imaging in the optical (WFPC2) and near-infrared (NICMOS) of a disk region 1 kpc NE of the starburst core in the nearby galaxy M82. This r…
Radially truncated galactic discs
Richard de Grijs, Michiel Kregel, Karen H. Wesson
We present the first results of a systematic analysis of radially truncated exponential discs for four galaxies of a complete sample of disc-dominated edge-on spiral galaxies. The…