Search Publications
The Internal Ultraviolet-Optical Color Dispersion: Quantifying the Morphological K-Correction
Papovich, Casey; Dickinson, Mark; Ferguson, Henry C. +2 more
We present a quantitative measure of the internal color dispersion within galaxies, which quantifies differences in galaxy morphology as a function of observed wavelength. We apply this statistic to a sample of local galaxies with archival images at 1500 and 2500 Å from the Ultraviolet Imaging Telescope and ground-based B-band observations in orde…
Gas-phase CO2 toward massive protostars
van Dishoeck, E. F.; Lahuis, F.; Doty, S. D. +1 more
We present infrared spectra of gas-phase CO2 around 15 mu m toward 14 deeply embedded massive protostars obtained with the Short Wavelength Spectrometer on board the Infrared Space Observatory. Gas-phase CO2 has been detected toward 8 of the sources. The excitation temperature and the gas/solid ratio increase with the tempera…
An EUV Bright Point as seen by SUMER, CDS, MDI and EIT on-board SoHO
Doyle, J. G.; Madjarska, M. S.; Teriaca, L. +1 more
This paper presents the formation, evolution and decay of a coronal bright point via a spectroscopic analysis of its transition region counterpart and the evolution of the underlying magnetic bipole during 3 days of almost continuous observations. The data were obtained with various instruments on-board SoHO, including the SUMER spectrograph in th…
Physical Conditions and Star Formation Activity in the Intragroup Medium of Stephan's Quintet
Lu, N.; Xu, C. K.; Tuffs, R. J. +2 more
New multiband observations of the famous compact group of galaxies Stephan's Quintet (SQ) are presented and analyzed. These include far-infrared (FIR) images at 60 and 100 µm (ISOPHOT C100 camera), radio continuum images at 1.4 GHz (VLA B configuration) and 4.86 GHz (VLA C configuration), and long-slit optical spectrographs (Palomar 200" tel…
The manifold spectra and morphologies of EROs
Cimatti, A.; Daddi, E.; Franceschini, A. +13 more
Deep VLT optical spectroscopy, HST+ACS (GOODS) imaging and VLA observations are used to unveil the nature of a complete sample of 47 EROs with R-Ks>5 and Ks<20. The spectroscopic redshift completeness is 62%. Morphological classification was derived for each ERO through visual inspection and surface brightness profile f…
A Compact X-Ray Source and Possible X-Ray Jets within the Planetary Nebula Menzel 3
Soker, Noam; Frank, Adam; Balick, Bruce +4 more
We report the discovery, by the Chandra X-Ray Observatory, of X-ray emission from the bipolar planetary nebula Menzel 3. In Chandra CCD imaging, Mz 3 displays hot [~(3-6)×106 K] gas within its twin, coaxial bubbles of optical nebulosity as well as a compact X-ray source at the position of its central star(s). The brightest diffuse X-ray…
A deep Chandra observation of the cluster environment of the z= 1.786 radio galaxy 3C 294
Fabian, A. C.; Ettori, S.; Sanders, J. S. +1 more
We report the results from a 200-ks Chandra observation of the z= 1.786 radio galaxy 3C 294 and its cluster environment, increasing by ten-fold our earlier observation. The diffuse emission, extending about 100 kpc around the nucleus, has a roughly hourglass shape in the north-south (N-S) direction with surprisingly sharp edges to the N and S. The…
High resolution soft X-ray spectroscopy of the elliptical galaxy NGC 5044. Results from the reflection grating spectrometer on-board XMM-Newton
Kaastra, J. S.; Tamura, T.; Makishima, K. +1 more
The results from an X-ray spectroscopic study of the giant elliptical galaxy NGC 5044 in the center of a galaxy group are presented. The line dominated soft X-ray spectra (mainly Fe-L and O Viii Lyalpha ) from the diffuse gas are resolved for the first time in this system with the Reflection Grating Spectrometers on-board XMM-Newton and provide a …
Modeling the Ne IX Triplet Spectral Region of Capella with the Chandra and XMM-Newton Gratings
Drake, Jeremy J.; Ness, Jan-Uwe; Huenemoerder, David P. +1 more
High-resolution X-ray spectroscopy with the diffraction gratings of Chandra and XMM-Newton offers new chances to study a large variety of stellar coronal phenomena. A popular X-ray calibration target is Capella, which has been observed with all gratings with significant exposure times. We gathered together all available data of the High Energy Tra…
Keck Spectroscopy and Hubble Space Telescope Imaging of GRB 000926: Probing a Host Galaxy at z = 2.038
Harrison, F. A.; Galama, T. J.; Bloom, J. S. +4 more
We present early-time Keck spectroscopic observations and late-time Hubble Space Telescope (HST) imaging of GRB 000926. The HST images show a small offset between the optical transient and a bright, compact knot in the host galaxy. Combined with the large equivalent widths measured for metallic absorption lines by the Keck Echellette Spectrograph …