Search Publications
High-Resolution Mid-Infrared Imaging of Infrared-Luminous Starburst Galaxies
Egami, E.; Scoville, N. Z.; Matthews, K. +7 more
Observations for seven infrared-luminous starburst galaxies are reported in the mid-infrared from 8 to 18 µm using the Keck telescopes with spatial resolution approaching the diffraction limit. All of the galaxies observed show evidence of strong interactions based on optical morphologies. For these galaxies, a substantial fraction, usually …
A Multiwavelength Study of Stephan's Quintet
Trinchieri, Ginevra; Xu, Cong; Sulentic, Jack W. +4 more
Stephan's Quintet (SQ) is a compact group that we find in an atypical moment when a high-velocity intruder is passing through it. The intrusion is particularly interesting because a previous intruder had stripped most of the gas from the group members. This debris field was shocked in the ongoing collision with the new intruder. This evolutionary …
Fractal Structure in Galactic Star Fields
Elmegreen, Bruce G.; Elmegreen, Debra Meloy
The fractal structure of star formation on large scales in disk galaxies is studied using the size distribution function of stellar aggregates in kiloparsec-scale star fields. Archival Hubble Space Telescope images of 10 galaxies are Gaussian-smoothed to define the aggregates, and a count of these aggregates versus smoothing scale gives the fracta…
A Chandra Study of the Circinus Galaxy Point-Source Population
Bauer, F. E.; Brandt, W. N.; Netzer, H. +4 more
We have used the Chandra X-Ray Observatory to resolve spatially and spectrally the X-ray emission from the Circinus galaxy. We report here on the nature of the X-ray emission from the off-nuclear point sources associated with the disk of Circinus, which make up ~34% of the total 0.5-10 keV emission. We find that many of the serendipitous X-ray sou…
New Insights from Hubble Space Telescope Studies of Globular Cluster Systems. II. Analysis of 29 S0 Systems
Kundu, Arunav; Whitmore, Bradley C.
We examine the globular cluster systems (GCSs) of a sample of 34 S0 galaxies from a WFPC2 snapshot survey in the V and I bands. Of these 34 galaxies, 29 have measurable globular cluster systems. The mean color of the GCSs of individual galaxies vary from V-I=0.85 mag to V-I=1.17 mag. The average color of GCSs in all 29 S0 galaxies, V-I=1.00+/-0.07…
Young Clusters in the Nuclear Starburst of M83
Conselice, Christopher J.; Calzetti, Daniela; Gallagher, John S., III +2 more
We present a photometric catalog of 45 massive star clusters in the nuclear starburst of M83 (NGC 5236), observed with the Hubble Space Telescope Wide Field Planetary Camera 2, in both broadband (F300W, F547M, and F814W) and narrowband (F656N and F487N) filters. By comparing the photometry with theoretical population synthesis models, we estimate …
The Resolved Stellar Populations in NGC 1705
Leitherer, Claus; Greggio, L.; Tosi, M. +4 more
We present HST photometry of the resolved stellar population in the dwarf irregular galaxy NGC 1705. The galaxy has been observed with both WFPC2 and NICMOS, and successful images have been obtained in the F555W, F814W, F110W, and F160W bands. The optical fields cover most of the galaxy, while the infrared field (NIC2) maps only its central region…
Radial Velocity Studies of Close Binary Stars. V.
Rucinski, Slavek M.; Lu, Wenxian; Mochnacki, Stefan W. +2 more
Radial velocity measurements and sine-curve fits to the orbital velocity variations are presented for the fifth set of 10 close binary systems: V376 And, EL Aqr, EF Boo, DN Cam, FN Cam, V776 Cas, SX Crv, V351 Peg, EQ Tau, and KZ Vir. All systems are double-lined, spectroscopic contact binaries (KZ Vir may be a low-inclination, close, noncontact bi…
A K-band-Selected Photometric Redshift Catalog in the Hubble Deep Field South: Sampling the Rest-Frame V Band to z =3
Franx, Marijn; Labbé, Ivo; van Dokkum, Pieter +7 more
We present the first results from the Faint Infra-Red Extragalactic Survey of the Hubble Deep Field South (HDF-S). Using a combination of deep near-infrared (NIR) data obtained with the Infrared Spectrograph and Array Camera at the VLT and the WFPC2 Hubble Space Telescope data, we construct a K-band-selected sample which is 50% and 90% complete fo…
An Ultraviolet through Infrared Look at Star Formation and Super Star Clusters in Two Circumnuclear Starburst Rings
Filippenko, Alexei V.; Ho, Luis C.; Maoz, Dan +2 more
We present broadband (U, V, I, and H) and narrowband (Hα+[N II] and Paα) images of the circumnuclear starburst rings in two nearby spiral galaxies, NGC 1512 and NGC 5248, obtained with the WFPC2 and NICMOS cameras on HST. Combined with previously published ultraviolet (UV) HST images at 2300 Å, these data provide a particularly wide wavelength ran…