Search Publications
Modeling the Interstellar Medium of Low Surface Brightness Galaxies: Constraining Internal Extinction, Disk Color Gradients, and Intrinsic Rotation Curve Shapes
Wood, Kenneth; Matthews, L. D.
We use a combination of three-dimensional Monte Carlo radiative transfer techniques and multiwavelength (BRHK, Hα) imaging data to investigate the nature of the interstellar medium (ISM) in the edge-on, low surface brightness (LSB) galaxy UGC 7321. Using realistic models that incorporate multiple scattering effects and clumping of the stars and th…
Near-Infrared Imaging and [O I] Spectroscopy of IC 443 using Two Micron All Sky Survey and Infrared Space Observatory
Reach, W. T.; Rho, Jeonghee; Jarrett, T. H. +1 more
We present near-infrared J (1.25 µm), H (1.65 µm), and Ks (2.17 µm) imaging of the entire supernova remnant IC 443 from the Two Micron All Sky Survey (2MASS), and Infrared Space Observatory (ISO) LWS observations of [O I] for 11 positions in the northeast. Near-infrared emission from IC 443 was detected in all three ba…
Structural Properties of Massive Young Clusters
Maíz-Apellániz, Jesús
We have retrieved multicolor WFPC2/Hubble Space Telescope data from the STScI archive for 27 nearby massive (>~3×104 Msolar) young (<20 Myr) star clusters (MYCs). The data represents the most complete sample of clearly resolved MYCs to date. We have analyzed their structural properties and have found that they can be cl…
Solid Carbon Dioxide in Regions of Low-Mass Star Formation
Whittet, D. C. B.; Gerakines, P. A.; Gibb, E. L. +2 more
We present high-resolution (R~1500-2000) spectra of the 4.27 µm asymmetric stretching feature of solid CO2 in eight lines of sight observed with the Short Wavelength Spectrometer of the Infrared Space Observatory. Two of the sources are field stars located behind the Taurus molecular cloud; the others are young stellar objects (YS…
Molecular Gas and the Modest Star Formation Efficiency in the ``Antennae'' Galaxies: Arp 244=NGC 4038/9
Gao, Yu; Lo, K. Y.; Lee, T. -H. +1 more
We report here a factor of 5.7 higher total CO flux in Arp 244 (the ``Antennae'' galaxies) than that previously accepted in the literature (thus a total molecular gas mass of 1.5×1010 Msolar), based on our fully sampled CO(1-0) observations at the NRAO 12 m telescope. Currently, much of the understanding and modeling of the s…
Very Long Lived Wave Patterns Detected in the Solar Surface Velocity Signal
Ulrich, Roger K.
The wavelike pattern of velocity variations in the outer layers of the Sun known as the ``torsional oscillations'' is shown to consist of long-lived inertial oscillation waves. The dominant pattern which was first identified at Mount Wilson and which has now been observed with the Michelson Doppler Imager instrument and the Global Oscillation Netw…
The Broad-Line and Narrow-Line Regions of the LINER NGC 4579
Filippenko, Alexei V.; Ho, Luis C.; Rix, Hans-Walter +2 more
We report the discovery of an extremely broad Hα emission line in the LINER nucleus of NGC 4579. From ground-based observations, the galaxy was previously known to contain a type 1 nucleus with a broad Hα line of FWHM~2300 km s-1 and FWZI~5000 km s-1. New spectra obtained with the Hubble Space Telescope (HST) and a 0.2" wide …
The Interstellar Medium of Star-forming Irregular Galaxies: The View with ISO
Dale, Daniel A.; Hunter, Deidre A.; Rubin, Robert H. +8 more
We present mid-infrared imaging and far-infrared (FIR) spectroscopy of five IBm galaxies observed by ISO as part of our larger study of the interstellar medium of galaxies. Most of the irregulars in our sample are very actively forming stars, and one is a starburst system. Thus, most are not typical Im galaxies. The mid-infrared imaging was in a b…
NICMOS Imaging of the Host Galaxies of z ~ 2-3 Radio-quiet Quasars
Heckman, Timothy M.; Calzetti, Daniela; Ridgway, Susan E. +1 more
We have made a deep NICMOS imaging study of a sample of five z~2-3 radio-quiet quasars with low absolute nuclear luminosities, and we have detected apparent host galaxies in all of these. Most of the hosts have luminosities approximately equal to present-day L*, with a range from 0.2L* to about 4L*. These host gala…
The Galaxy Population of Cluster RX J0848+4453 at Z=1.27
Dickinson, M.; van Dokkum, P. G.; Stanford, S. A. +3 more
We present a study of the galaxy population in the IR-selected cluster RX J0848+4453 at z=1.27, using deep Hubble Space Telescope (HST) NICMOS HF160W and WFPC2 IF814W images of the cluster core. We morphologically classify all galaxies to Ks=20.6 that are covered by the HST imaging and determine photometric redshif…