Search Publications
Amplitude and orientation of prominence magnetic fields from constant-alpha magnetohydrostatic models
Aulanier, G.; Démoulin, P.
We analyze outputs from three-dimensional models for three observed filaments, which belong to the quiescent, intermediate and plage class respectively. Each model was calculated from a constant-alpha magnetohydrostatic extrapolation, assuming that the prominence material is located in magnetic dips, so that the field is nearly horizontal througho…
A SCUBA Galaxy in the Protocluster around 53W002 at z=2.4
Ivison, R. J.; Smail, Ian; Motohara, K. +4 more
We analyze an 850 µm Submillimetre Common-User Bolometer Array (SCUBA) map of the environment of the z=2.39 radio galaxy 53W002, which has been shown to reside in an overdensity of Lyα-detected galaxies. We identify four luminous submillimeter sources within a 2.3‧ (1.2 Mpc at z=2.39) diameter area around the radio galaxy (which itself is a …
Spectroscopic diagnostics of an Hα and EUV filament observed with THEMIS and SOHO
Heinzel, P.; Schmieder, B.; Tziotziou, K.
A long filament has been observed with THEMIS/MSDP and SOHO/CDS - SUMER, during a coordinated campaign (JOPs 131/95) on May 5, 2000. The data were (a) 2-D Hα spectra, observed using THEMIS, (b) Lyman series spectra and Lyman continuum, observed using SOHO/SUMER, and (c) EUV spectra (in O V 629 Å, Mg X 624 Å, Si Xii 520 Å, Ca X 557 Å and He I 584 Å…
Searching for z~=6 Objects with the Hubble Space Telescope Advanced Camera for Surveys: Preliminary Analysis of a Deep Parallel Field
Yan, Haojing; Windhorst, Rogier A.; Cohen, Seth H.
Recent results suggest that z~=6 marks the end of the reionization era. A large sample of objects at z~=6, therefore, will be of enormous importance, as it will enable us to observationally determine the exact epoch of the reionization and the sources that are responsible for it. With the Hubble Space Telescope Advanced Camera for Surveys (ACS) co…
Emission-Line Galaxies in the STIS Parallel Survey. II. Star Formation Density
Gardner, Jonathan P.; Teplitz, Harry I.; Rhodes, Jason +2 more
We present the luminosity function of [O II]-emitting galaxies at a median redshift of z=0.9, as measured in the deep spectroscopic data in the STIS Parallel Survey (SPS). The luminosity function shows strong evolution from the local value, as expected. By using random lines of sight, the SPS measurement complements previous deep single-field stud…
Far-infrared photometry of deeply embedded outflow sources
Smith, M. D.; Eislöffel, J.; Froebrich, D. +1 more
We present far-infrared maps and spectroscopy for a number of deeply embedded protostellar objects (CepE, HH211-MM, IC1396 W, L1157, L1211, and RNO 15FIR) from data that we acquired with the Infrared Space Observatory (ISO) photopolarimeter (PHOT) and Long Wavelength Spectrometer (LWS). Several previously undetected deeply embedded sources are fou…
Abundances and Physical Conditions in the Interstellar Gas toward HD 185418
York, Donald G.; Welty, Daniel E.; Snow, Theodore P. +2 more
We present a study of the abundances and physical conditions in the interstellar gas toward the moderately reddened B0.5 V star HD 185418. This star is located at (l,b)=(53deg,-2.2d) and has an estimated distance of 790 pc and a reddening E(B-V)=0.50. This work is based on the analysis of Far Ultraviolet Spectroscopic Explore…
Chandra Observations of Low-Mass X-Ray Binaries and Diffuse Gas in the Early-Type Galaxies NGC 4365 and NGC 4382 (M85)
Sarazin, Craig L.; Sivakoff, Gregory R.; Irwin, Jimmy A.
We used the Chandra X-Ray Observatory ACIS-S3 to image the X-ray-faint elliptical galaxy NGC 4365 and lenticular galaxy NGC 4382. The observations resolve much of the X-ray emission into 99 and 58 sources, respectively, most of which are low-mass X-ray binaries (LMXBs) associated with each of the galaxies. Within one effective radius of NGC 4365, …
Signature of an Avalanche in Solar Flares as Measured by Photospheric Magnetic Fields
Wang, H.; Goode, P. R.; Abramenko, V. I. +2 more
We analyzed time variations of turbulent parameters of the photospheric magnetic field of four active regions obtained during the course of major solar flares using longitudinal magnetograms from the Big Bear Solar Observatory and from SOHO/MDI full-disk measurements. Analysis of the data indicated that, before each flare, the degree of intermitte…
The afterglow and the host galaxy of GRB 011211
Kouveliotou, C.; Tanvir, N.; Pedersen, H. +19 more
We present optical, near-infrared, and X-ray observations of the optical afterglow (OA) of the X-ray rich, long-duration gamma-ray burst GRB 011211. Hubble Space Telescope (HST) data obtained 14, 26, 32, and 59 days after the burst, show the host galaxy to have a morphology that is fairly typical of blue galaxies at high redshift. We measure its m…