Science Archives Publication System

Origins of the Highly Ionized Gas along the Line of Sight toward HD 116852

DOI: 10.1086/344692 Bibcode: 2003ApJ...582..793F

Richter, Philipp; Sembach, Kenneth R.; Savage, Blair D. +5 more

We present Hubble Space Telescope Imaging Spectrograph (HST/STIS) and Far Ultraviolet Spectroscopic Explorer (FUSE) observations of high ion interstellar ultraviolet absorption along the sight line to HD 116852. At a distance of 4.8 kpc, HD 116852 is an O9 III star lying in the low Galactic halo, -1.3 kpc from the plane of the Galaxy in the direct…

2003 • The Astrophysical Journal

eHST 23

Density and Temperature Measurements in a Solar Active Region

DOI: 10.1086/379094 Bibcode: 2003ApJ...596L.113W

Winebarger, Amy R.; Warren, Harry P.

We present electron density and temperature measurements from an active region observed above the limb with the Solar Ultraviolet Measurements of Emitted Radiation spectrometer on the Solar and Heliospheric Observatory. Density-sensitive line ratios from Si VIII and S X indicate densities greater than 10⁸ cm^-3 as high as 200"…

2003 • The Astrophysical Journal

SOHO 23

Dust in Hot Gas: Far-Infrared Emission from Three Local Elliptical Galaxies

DOI: 10.1086/374326 Bibcode: 2003ApJ...585L.121T

Brighenti, Fabrizio; Mathews, William G.; Bregman, Jesse D. +1 more

We present far-IR Infrared Space Observatory observations of three early-type galaxies in the Virgo Cluster. The data were recorded using the ISOPHOT instrument in both the P32 oversampled maps and the P39/37 sparse maps. The maps reach the limiting sensitivity of the ISOPHOT instrument at 60, 90, and 180 µm. Two of the most prominent ellipt…

2003 • The Astrophysical Journal

ISO 23

Dynamics of the Lyα and C IV Emitting Gas in 3C 273

DOI: 10.1086/345421 Bibcode: 2003ApJ...583..659P

Paltani, Stéphane; Türler, Marc

In this paper we study the variability properties of the Lyα and C IV emission lines in 3C 273 using archival International Ultraviolet Explorer observations. Our data show for the first time the existence of variability on timescales of several years. We study the spatial distribution and the velocity field of the emitting gas by performing detai…

2003 • The Astrophysical Journal

IUE 23

Stellar Motions in the Polar Ring Galaxy NGC 4650A

DOI: 10.1086/375159 Bibcode: 2003ApJ...587L..23S

Swaters, Rob A.; Rubin, Vera C.

We present the first measurement of the stellar kinematics in the polar ring of NGC 4650A. There is well-defined rotation, with the stars and gas rotating in the same direction, and with similar amplitude. The gaseous and stellar kinematics suggest an approximately flat rotation curve, providing further support for the hypothesis that the polar ma…

2003 • The Astrophysical Journal

eHST 23

GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

DOI: 10.1051/0004-6361:20031393 Bibcode: 2003A&A...411L.315C

Pian, E.; Palazzi, E.; Greiner, J. +39 more

We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and ~ 1.7 days after the event. Here we report the discovery of a dim optical afterglow (OA) that would not have been detected by many previous searches due to its faintess (R ~ 23). This OA was seen to decline follow…

2003 • Astronomy and Astrophysics

INTEGRAL 23

Maximum Entropy imaging with INTEGRAL/SPI data

DOI: 10.1051/0004-6361:20031204 Bibcode: 2003A&A...411L.127S

Strong, A. W.

The application of the Maximum Entropy method for sky imaging with the SPI instrument on INTEGRAL is described. While intended primarily for extended emission, point sources are also mapped by this method. The technique is implemented as the program spiskymax in the data analysis distribution provided by the INTEGRAL Science Data Centre. We briefl…

2003 • Astronomy and Astrophysics

INTEGRAL 23

Impact of aerosols present in Titan's atmosphere on the CASSINI radar experiment

DOI: 10.1016/S0019-1035(03)00125-8 Bibcode: 2003Icar..164..213R

Rodriguez, S.; Encrenaz, P.; Dobrijevic, M. +4 more

Simulations of Titan's atmospheric transmission and surface reflectivity have been developed in order to estimate how Titan's atmosphere and surface properties could affect performances of the Cassini radar experiment. In this paper we present a selection of models for Titan's haze, vertical rain distribution, and surface composition implemented i…

2003 • Icarus

Cassini 23

Multisite observations of the PMS delta Scuti star V351 Ori

DOI: 10.1051/0004-6361:20031011 Bibcode: 2003A&A...408.1047R

Ripepi, V.; Palla, F.; Marconi, M. +12 more

We present the results of multisite observations spanning two years on the pre-main-sequence (PMS) star V351 Ori. A total of around 180 hours of observations over 29 nights have been collected, allowing us to measure five different periodicities, most likely related to the delta Scuti variability of V351 Ori. Comparison with the predictions of lin…

2003 • Astronomy and Astrophysics

Hipparcos 23

Near-Infrared Observations of BL Lacertae Host Galaxies

DOI: 10.1086/379227 Bibcode: 2003ApJ...599..155C

Giavalisco, Mauro; Cheung, C. C.; Urry, C. Megan +1 more

Multiband near-infrared images of 12 BL Lacertae objects were obtained with the 2.5 m telescope at the Las Campanas Observatory in order to determine the properties of their underlying host galaxies. Resolved emission was clearly detected in eight of the lowest redshift targets (up to z~0.3) and was modeled with a de Vaucouleurs r^1/4 su…

2003 • The Astrophysical Journal

eHST 23