An HST/WFPC2 survey of bright young clusters in M31. IV. Ages and mass estimates (2009)
Perina, S., Cohen, J. G., Barmby, P., Beasley, M. A., Bellazzini, M., Brodie, J. P., ...
{Aims.} We present the main results of an imaging survey of possible young massive clusters (YMC) in M31 performed with the Wide Field and Planetary Camera2 (WFPC2) on the Hubble Space Telescope...
Perina, S., Barmby, P., Beasley, M. A., Bellazzini, M., Brodie, J. P., Burstein, D., ...
Aims. We introduce our imaging survey of possible young massive globular clusters in M31 performed with the Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST). We obtained...
Perina, S., Barmby, P., Beasley, M. A., Bellazzini, M., Brodie, J. P., Burstein, D., ...
{Aims.} We introduce our imaging survey of possible young massive globular clusters in M31 performed with the Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST). We present...
HST/ACS Wide-Field Photometry of the Sombrero Galaxy Globular Cluster System (2006)
Spitler, L. R., Larsen, S. S., Strader, J., Brodie, J. P., Forbes, D. A., Beasley, M. A.
A detailed imaging analysis of the globular cluster (GC) system of the Sombrero galaxy (NGC 4594) has been accomplished using a six-image mosaic from the Hubble Space Telescope Advanced Camera for...
Burstein, D., Li, Y., Freeman, K. C., Norris, J. E., Bessell, M. S., Bland-Hawthorn, J., ...
The globular cluster (GC) systems of the Milky Way and of our neighboring spiral galaxy, M31, comprise 2 distinct entities, differing in 3 respects. 1. M31 has young GCs, ages from ~100 Myr to 5 Gyr...
Explaining the mysterious age gap of globular clusters in the Large Magellanic Cloud (2004)
Bekki, K., Couch, W. J., Beasley, M. A., Forbes, D. A., Chiba, M., Da Costa, G. S.
The Large Magellanic Cloud (LMC) has a unique cluster formation history in that nearly all of its globular clusters were formed either $\sim$ 13 Gyr ago or less than $\sim$ 3 Gyr ago. It is not clear...
Formation of globular clusters in galaxy mergers (2003)
Bekki, Kenji, Couch, Warrick J., Forbes, Duncan A., Beasley, M. A.
Our numerical simulations first demonstrate that the pressure of ISM in a major merger becomes so high ($>$ $10^5$ $\rm k_{\rm B}$ K $\rm cm^{-3}$) that GMCs in the merger can collapse to form...
Evidence for An Intermediate-Age, Metal-rich Population of Globular Clusters in NGC 4365 (2002)
Larsen, S. S., Brodie, J. P., Beasley, M. A., Forbes, D. A., Kissler-Patig, M., Kuntschner, H., ...
We present spectroscopy for globular clusters (GCs) in the elliptical galaxy NGC 4365, obtained with the LRIS spectrograph on the Keck I telescope. Previous studies have shown that the optical color...
Testing stellar population models with star clusters in the Large Magellanic Cloud. (2002)
Beasley, M. A., Hoyle, F., Sharples, R. M.
We present high signal-to-noise ratio integrated spectra of 24 star clusters in the Large Magellanic Cloud (LMC), obtained using the FLAIR spectrograph at the UK Schmidt telescope. The spectra have...
Forming Globular Cluster Systems Semi-analytically (2002)
Beasley, M. A., Baugh, C. M., Forbes, D. A., Sharples, R. M., Frenk, C. S.
We describe a scheme for the formation of globular cluster systems in early-type galaxies using a semi-analytic model of galaxy formation. Operating within a Lambda CDM cosmology, we assume that...
Bekki, K., Forbes, Duncan A., Beasley, M. A., Couch, W. J.
We investigate the spatial, kinematic and chemical properties of globular cluster systems formed in merging and interacting galaxies using N-body/SPH simulations. Although we can not resolve...
On the formation of globular cluster systems in a hierarchical universe. (2002)
Beasley, M. A., Baugh, C. M., Forbes, D. A., Sharples, R. M., Frenk, C. S.
We have investigated the formation of globular cluster (GC) systems in the fiducial semi-analytic model of galaxy formation of Cole et al., by assuming that GCs are formed at high redshifts (z>5) in...
Keck Spectroscopy of Globular Clusters in the Sombrero Galaxy (2002)
Larsen, S. S., Brodie, J. P., Beasley, M. A., Forbes, D. A.
We analyze high signal-to-noise spectra for 14 globular clusters (GCs) in the Sombrero galaxy, NGC 4594 = M104, obtained with the LRIS spectrograph on the Keck I telescope. We find generally good...
On the Formation of Globular Cluster Systems in a Hierarchical Universe (2002)
Beasley, M. A., Baugh, C. M., Forbes, Duncan A., Sharples, R. M., Frenk, C. S.
We have investigated the formation of globular cluster (GC) systems in the fiducial semi-analytic galaxy formation model of Cole et al. We assume that GCs are formed at high-redshift (z > 5) in...
Ages and Metallicities of Globular Clusters in NGC 4472 (2000)
Beasley, M. A., Sharples, R. M., Bridges, T. J., Hanes, D. A., Zepf, S. E., Ashman, K. M., ...
We have derived ages and metallicities from co-added spectra of 131 globular clusters associated with the giant elliptical galaxy NGC 4472. Based upon a calibration with Galactic globular clusters,...
Spectroscopy of Globular Clusters in the Sculptor Group Galaxies NGC 253 and NGC 55 (1999)
Beasley, M. A., Sharples, R. M.
We have obtained spectra for 103 published globular cluster candidates in the Sculptor Group galaxies NGC 253 and NGC 55. On the basis of radial velocities and digitized plate images, 14 globular...