Search Publications
A Full View of EIT Waves
Chen, P. F.; Shibata, K.; Fang, C.
Early observations by the EUV Imaging Telescope (EIT) on the Solar and Heliospheric Observatory indicated that propagating diffuse wave fronts, now conventionally referred to as ``EIT waves,'' can often be seen on the solar disk with a propagation velocity several times smaller than that of Hα Moreton waves. They are almost always associated with …
AGN Host Galaxies at z~0.4-1.3: Bulge-dominated and Lacking Merger-AGN Connection
Jogee, S.; Hornschemeier, A. E.; Alexander, D. M. +13 more
We investigate morphological structure parameters and local environments of distant moderate-luminosity active galactic nucleus (AGN) host galaxies in the overlap between the HST/ACS observations of the Great Observatories Origins Deep Survey (GOODS) and the two Chandra Deep Fields. We compute near-neighbor counts and BViz asymmetry (A) and concen…
Eruption of a Kink-unstable Filament in NOAA Active Region 10696
van Driel-Gesztelyi, Lidia; Démoulin, Pascal; Török, Tibor +2 more
We present rapid-cadence Transition Region and Coronal Explorer (TRACE) observations that show evidence of a filament eruption from NOAA active region 10696, accompanied by an X2.5 flare, on 2004 November 10. The eruptive filament, which manifests as a fast coronal mass ejection some minutes later, rises as a kinking structure with an apparently e…
An Overabundance of Transient X-Ray Binaries within 1 Parsec of the Galactic Center
Brandt, W. N.; Muno, M. P.; Baganoff, F. K. +4 more
During 5 years of Chandra observations, we have identified seven X-ray transients located within 23 pc of Sgr A*. These sources each vary in luminosity by more than a factor of 10 and have peak X-ray luminosities greater than 5×1033 ergs s-1, which strongly suggests that they are accreting black holes or neutron stars. The pe…
A Census of Optical and Near-Infrared Selected Star-forming and Passively Evolving Galaxies at Redshift z ~ 2
Pettini, Max; Erb, Dawn K.; Shapley, Alice E. +3 more
Using the extensive multiwavelength data in the GOODS-North field, including our ground-based rest-frame UV spectroscopy and near-IR imaging, we construct and draw comparisons between samples of optical and near-IR selected star-forming and passively evolving galaxies at redshifts 1.4<~z<~2.6. We find overlap at the 70%-80% level in samples …
Measuring the Three-dimensional Structure of Galaxy Clusters. I. Application to a Sample of 25 Clusters
Sereno, Mauro; Bautz, Mark W.; Longo, Giuseppe +1 more
We discuss a method to constrain the intrinsic shapes of galaxy clusters by combining X-ray and Sunyaev-Zel'dovich observations. The method is applied to a sample of 25 X-ray-selected clusters, with measured Sunyaev-Zel'dovich temperature decrements. The sample turns out to be slightly biased, with strongly elongated clusters preferentially aligne…
The Physical Properties and Effective Temperature Scale of O-Type Stars as a Function of Metallicity. II. Analysis of 20 More Magellanic Cloud Stars and Results from the Complete Sample
Massey, Philip; Pauldrach, A. W. A.; Bresolin, Fabio +3 more
In order to determine the physical properties of the hottest and most luminous stars and understand how these properties change as a function of metallicity, we have analyzed HST/UV and high-S/N optical spectra of an additional 20 Magellanic Cloud stars, doubling the sample presented in the first paper in this series. Our analysis uses non-LTE lin…
Mass-to-Light Ratios of Field Early-Type Galaxies at z ~ 1 from Ultradeep Spectroscopy: Evidence for Mass-dependent Evolution
Rosati, P.; Rix, H. -W.; van der Wel, A. +3 more
We present an analysis of the fundamental plane for a sample of 27 field early-type galaxies in the redshift range 0.6<z<1.15 in the Chandra Deep Field-South and the field of the background cluster RDCS 1252.9-2927. Sixteen of the galaxies are at z>0.95. The galaxies in this sample have high signal-to-noise ratio spectra obtained at the V…
The Assembly of Diversity in the Morphologies and Stellar Populations of High-Redshift Galaxies
Papovich, Casey; Dickinson, Mark; Ferguson, Henry C. +2 more
We have used deep images from the Hubble Space Telescope to study the evolution in the morphologies, sizes, stellar masses, colors, and internal color dispersion of galaxies in the Hubble Deep Field-North. We selected two galaxy samples at 0.7<=z<=1.4 and 1.9<=z<=3.0 from a near-infrared, flux-limited catalog with complete photometric …
Galaxy Morphologies in the Hubble Ultra Deep Field: Dominance of Linear Structures at the Detection Limit
Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Rubin, Douglas S. +1 more
Galaxies in the Hubble Ultra Deep Field (UDF) larger than 10 pixels (0.3") have been classified according to morphology, and their photometric properties are presented. There are 269 spiral, 100 elliptical, 114 chain, 126 double-clump, 97 tadpole, and 178 clump-cluster galaxies. We also cataloged 30 B-band and 13 V-band dropouts and calculated the…