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The Infall of Gas onto the Galactic Disk
Brad K. Gibson
Ongoing accretion of low-metallicity gas onto the disk is a natural prediction of semi-analytical Galactic chemical evolution models. This star formation fuel ameliorates the overp…
HIPASS High-Velocity Clouds: Properties of the Compact and Extended Populations
M. E. Putman, V. de Heij, L. Staveley-Smith +5
A catalog of Southern anomalous-velocity HI clouds at Decl. < +2 deg is presented, based on data from the HI Parkes All-Sky Survey (HIPASS). The improved sensitivity (5sigma: T_B =…
The Distance to Supernova 1998aq in NGC3982
Peter B. Stetson, Brad K. Gibson
The distance to NGC3982, host galaxy to the Type Ia supernova SN1998aq, is derived using 32 Cepheids discovered in archival multi-epoch Hubble Space Telescope observations. Employi…
Simulating a white dwarf dominated halo
C. B. Brook, Daisuke Kawata, Brad K. Gibson
Halo initial mass functions (IMFs) heavily biased toward white dwarf (WD) precursors ~1-8 Msun have been suggested as a suitable mechanism for explaining MACHO events. However, by…
A Numerical Study of the Chemo-Dynamical Evolution of Elliptical Galaxies
Daisuke Kawata, Brad K. Gibson
We investigate the chemo-dynamical evolution of elliptical galaxies, to understand the origin of the mass-dependence of photometric properties such as the colour-magnitude relation…
Are High-Velocity Clouds the Building Blocks of the Local Group?
Brad K. Gibson, Yeshe Fenner, Sarah T. Maddison +1
Motivated by the apparent order-of-magnitude discrepancy between the observed number of Local Group satellite galaxies, and that predicted by Lambda-CDM hierarchical clustering cos…
HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group
S. D. Ryder, B. Koribalski, L. Staveley-Smith +26
We report the discovery, from the HI Parkes All-Sky Survey (HIPASS), of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69,…
NICMOS Observations of Extragalactic Cepheids. I. Photometry Database and a Test of the Standard Extinction Law
L. M. Macri, D. Calzetti, W. L. Freedman +8
We present the results of near-infrared observations of extragalactic Cepheids made with the Near Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope.…