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10 papers · 2 filters
Neutral Hydrogen in the Ringed Barred Galaxies NGC 1433 and NGC 6300
Stuart D. Ryder, Ronald J. Buta, Hector Toledo +3
We have made observations of the \ion{H}{1} in the southern ringed barred spiral galaxies NGC~1433 and NGC~6300 with the Australia Telescope Compact Array (ATCA), the main goal bei…
The proximity effect on the Lyman alpha forest due to a a foreground QSO
A. Fernandez-Soto, X. Barcons, R. Carballo +1
The influence of a foreground QSO on the lyman a forest of another QSO with higher redshift has been investigated by analyzing the spectra of three such objects at redshifts $z=2 -…
Hubble Space Telescope Observations of the Lensing Cluster Abell 2218
J. -P. Kneib, R. S. Ellis, I. Smail +2
We present a striking new Hubble Space Telescope (HST) observation of the rich cluster Abell 2218 taken with the Wide-Field and Planetary Camera (WFPC2). HST's restored image quali…
The life-cycle of star formation in distant clusters
A. J. Barger, A. Aragon-Salamanca, R. S. Ellis +3
We analyse the detailed distribution of star-forming and post-starburst members in three distant (z = 0.31) galaxy clusters in terms of evolutionary sequences that incorporate seco…
A Study of Absorption Features in the Three Micron Spectra of Molecular Cloud Sources with HO Ice Bands
T. Y. Brooke, K. Sellgren, R. G. Smith
New 3.3--3.6~m spectra were obtained of nine young stellar objects embedded in molecular clouds. An absorption feature at 3.47~m (2880~cm) with FWHM0.09 $μ…
A New 3.25 Micron Absorption Feature toward Mon R2/IRS-3
K. Sellgren, T. Y. Brooke, R. G. Smith
A new 3.2--3.5~m spectrum of the protostar Mon~R2/IRS-3 confirms our previous tentative detection of a new absorption feature near 3.25 m. The feature in our new spectrum has…