Search Publications
A Multiwavelength Study of IC 63 and IC 59
Martin, P. G.; Noriega-Crespo, A.; Karr, J. L.
IC 63 and IC 59 are two nearby arc-shaped nebulae with relatively simple geometries and minimal obscuring material. The two regions, in spite of a similar projected distance from their ionizing star, have very different observational properties, both in continuum emission and in the presence and strength of line emission from molecular species. Th…
Optical Identification of Infrared Space Observatory Far-Infrared Sources in the Lockman Hole Using a Deep Very Large Array 1.4 GHz Continuum Survey
Veilleux, S.; Sanders, D. B.; Kawara, K. +10 more
By exploiting the far-infrared (FIR) and radio correlation, we have performed a likelihood-ratio analysis to identify optical counterparts to the FIR sources that have been found in an area of ~0.9 deg2 during the Infrared Space Observatory (ISO) deep FIR survey in the Lockman Hole. New ground-based observations have been conducted to b…
The Evolution of Stellar Mass in Galaxies in the NICMOS Ultra Deep Field
Gwyn, S. D. J.; Hartwick, F. D. A.
We measure the buildup of the stellar mass of galaxies from z=6 down to z=1. Using 15 band multicolor imaging data in the NICMOS Ultra Deep Field we derive photometric redshifts and masses for 796 galaxies down to HAB=26.5 mag. The derived evolution of the global stellar mass density of galaxies is consistent with previous star formatio…
VLT UVES Observations of the Balmer Line Variations of η Carinae during the 2003 Spectroscopic Event
Weis, K.; Stahl, O.; Bomans, D. J. +3 more
We present high spectral resolution echelle observations of the Balmer line variations during the 2003.5 ``spectroscopic event'' of η Carinae. Spectra have been recorded of both η Car and the Homunculus at the ``FOS4'' position in its southeast lobe. This spot shows a reflected stellar spectrum that is less contaminated by nebular emission lines t…
The [O III] Veil: Astropause of η Carinae's Wind?
Smith, Nathan; Bally, John; Morse, Jon A.
We present narrowband images of η Carinae in the light of [O III] λ5007 obtained with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2, as well as a ground-based image in the same emission line with a larger field of view. These images show a thin veil of [O III] emission around η Car and its ejecta, confirming the existence of an ox…
A Search for Substellar Companions around 15 Weak-Lined T Tauri Stars with the Planetary Camera 2 of the Hubble Space Telescope
Torres, Guillermo; Latham, David W.; Oppenheimer, Benjamin D. +2 more
To search for thermal emission from substellar companions, we have obtained Z-band images of 15 weak-lined T Tauri stars in the Taurus-Auriga and Ophiuchus star-forming regions using the Planetary Camera 2 on the Hubble Space Telescope. We found 18 faint nearby objects at separations larger than 4" but none at smaller separations. For 11 of these …
Hubble Space Telescope and United Kingdom Infrared Telescope Observations of the Center of the Trifid Nebula: Evidence for the Photoevaporation of a Proplyd and a Protostellar Condensation
Geballe, T. R.; Yusef-Zadeh, F.; Biretta, J.
The Trifid Nebula (M20) is a well-known prominent optical H II region trisected by bands of obscuring dust lanes and excited by an O7.5 star, HD 164492A. Previous near-IR, mid-IR, and radio continuum observations of the cluster of stars at the center of the Trifid Nebula indicated the presence of circumstellar disks associated with hot stars with …
Radio Observations of the Hubble Deep Field-South Region. I. Survey Description and Initial Results
Williams, Robert E.; Norris, Ray P.; Hopkins, Andrew M. +8 more
This paper is the first of a series describing the results of the Australia Telescope Hubble Deep Field-South radio survey. The survey was conducted at four wavelengths, 20, 11, 6, and 3 cm, over a 4 year period and achieves an rms sensitivity of about 10 µJy at each wavelength. We describe the observations and data reduction processes and p…
The Hubble Space Telescope ACS Grism Parallel Survey. II. First Results and a Catalog of Faint Emission-Line Galaxies at z<=1.6
Chen, Hsiao-Wen; Spinrad, Hyron; Stern, Daniel +4 more
We present the first results from the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Grism Parallel Survey, a large program obtaining deep, slitless ACS grism spectroscopy of high-latitude HST parallel fields. We report on 11 high Galactic latitude fields here, each with grism integration times of more than 12 ks. We identify 601 c…
XMM-Newton Spectroscopy of the Highly Polarized and Luminous Broad Absorption Line Quasar CSO 755
Brandt, W. N.; Vignali, C.; Comastri, A. +4 more
We present the results from XMM-Newton observations of the highly optically polarized broad absorption line quasar (BALQSO) CSO 755. By analyzing its X-ray spectrum with a total of ~3000 photons, we find that this source has the X-ray continuum of a typical radio-quiet quasar, with a photon index of Γ=1.83+0.07-0.06 and a rat…