Science Archives Publication System

Global Far-Ultraviolet (912-1800 Å) Properties of Star-forming Galaxies

DOI: 10.1086/342486 Bibcode: 2002ApJS..140..303L

Heckman, Timothy M.; Calzetti, Daniela; Leitherer, Claus +1 more

We present the results of an archival study of the Hopkins Ultraviolet Telescope (HUT) Astro-2 database. Nineteen spectra of star-forming regions and starburst galaxies were retrieved, reprocessed, and analyzed. The spectra cover the wavelength region 912-1800 Å, providing access to the domain of peak luminosity from a young stellar population. We…

2002 • The Astrophysical Journal Supplement Series

IUE 162

Gravitational Microlensing Events Due to Stellar-Mass Black Holes

DOI: 10.1086/342225 Bibcode: 2002ApJ...579..639B

Alcock, C.; Allsman, R. A.; Alves, D. R. +30 more

We present an analysis of the longest timescale microlensing events discovered by the MACHO Collaboration during a 7 year survey of the Galactic bulge. We find six events that exhibit very strong microlensing parallax signals due, in part, to accurate photometric data from the GMAN and MPS collaborations. The microlensing parallax fit parameters a…

2002 • The Astrophysical Journal

eHST 161

The very local Hubble flow

DOI: 10.1051/0004-6361:20020649 Bibcode: 2002A&A...389..812K

Sarajedini, A.; Dolphin, A. E.; Grebel, E. K. +8 more

We present Hubble Space Telescope/WFPC2 images of eighteen galaxies situated in the vicinity of the Local Group (LG) as part of an ongoing snapshot survey of nearby galaxies. Their distances derived from the magnitude of the tip of the red giant branch are 1.92±0.10 Mpc (ESO 294-010), 3.06±0.37 (NGC 404), 3.15±0.32 (UGCA 105), 1.36±0.07 (Sex B), 1…

2002 • Astronomy and Astrophysics

eHST 161

Physical parameters of the high-mass X-ray binary 4U1700-37

DOI: 10.1051/0004-6361:20021184 Bibcode: 2002A&A...392..909C

Kaper, L.; Crowther, P. A.; Goodwin, S. P. +4 more

We present the results of a detailed non-LTE analysis of the ultraviolet and optical spectrum of the O6.5 Iaf⁺ star HD 153919 - the mass donor in the high-mass X-ray binary 4U1700-37. We find that the star has a luminosity log(L_*/L_sun)=5.82 +/- 0.07, T_eff=35 000 +/- 1000 K, ra…

2002 • Astronomy and Astrophysics

IUE 160

The internal structure of the lens PG1115+080: breaking degeneracies in the value of the Hubble constant

DOI: 10.1046/j.1365-8711.2002.06107.x Bibcode: 2002MNRAS.337L...6T

Treu, T.; Koopmans, L. V. E.

We combine lensing, stellar kinematic and mass-to-light ratio constraints to build a two-component (luminous plus dark) mass model of the early-type lens galaxy in PG1115+080. We find a total mass density profile steeper than r^-2, effectively ρ~r^-γ' with γ'= 2.35 +/- 0.1 +/- 0.05 (random + systematic). The stellar mass fracti…

2002 • Monthly Notices of the Royal Astronomical Society

eHST 160

The solar wind composition throughout the solar cycle: A continuum of dynamic states

DOI: 10.1029/2001GL013946 Bibcode: 2002GeoRL..29.1352Z

Zurbuchen, T. H.; Gloeckler, G.; Fisk, L. A. +1 more

Variations in the speed and elemental and ionic charge composition of the solar wind are reported throughout the solar cycle, as observed by the SWICS instrument on Ulysses. The apparent bimodal nature of the solar wind during the solar minimum does not persist throughout the solar cycle. Rather, with increasing solar activity, a continuum of sola…

2002 • Geophysical Research Letters

Ulysses 160

Active-Region Monitoring and Flare Forecasting I. Data Processing and First Results

DOI: 10.1023/A:1020950221179 Bibcode: 2002SoPh..209..171G

Moon, Y. -J.; Wang, Haimin; Gallagher, Peter T.

This paper discusses a near real-time approach to solar active-region monitoring and flare prediction using the Big Bear Solar Observatory Active Region Monitor (ARM). Every hour, ARM reads, calibrates, and analyses a variety of data including: full-disk Hα images from the Global Hα Network; EUV, continuum, and magnetogram data from the Solar and …

2002 • Solar Physics

SOHO 159

Chandra Observations of ``The Antennae'' Galaxies (NGC 4038/4039). III. X-Ray Properties and Multiwavelength Associations of the X-Ray Source Population

DOI: 10.1086/342160 Bibcode: 2002ApJ...577..710Z

Zezas, A.; Fabbiano, G.; Murray, S. S. +1 more

We investigate the nature of the luminous X-ray source population detected in a (72 ks) Chandra ACIS-S observation of NGC 4038/4039, the Antennae galaxies. We derive the average X-ray spectral properties of sources in different luminosity ranges, and we correlate the X-ray positions with radio, IR, and optical (Hubble Space Telescope) data. The X-…

2002 • The Astrophysical Journal

eHST 158

A pulsating auroral X-ray hot spot on Jupiter

DOI: 10.1038/4151000a Bibcode: 2002Natur.415.1000G

Dougherty, M. K.; Young, D. T.; Clarke, J. T. +12 more

Jupiter's X-ray aurora has been thought to be excited by energetic sulphur and oxygen ions precipitating from the inner magnetosphere into the planet's polar regions. Here we report high-spatial-resolution observations that demonstrate that most of Jupiter's northern auroral X-rays come from a `hot spot' located significantly poleward of the latit…

2002 • Nature

eHST 158

The Evolution of Field Early-Type Galaxies to z~0.7

DOI: 10.1086/338790 Bibcode: 2002ApJ...564L..13T

Stiavelli, Massimo; Treu, Tommaso; Casertano, S. +2 more

We have measured the fundamental plane (FP) parameters for a sample of 30 field early-type galaxies (E/S0s) in the redshift range 0.1<z<0.66. We find that (i) the FP is defined and tight out to the highest redshift bin; (ii) the intercept γ evolves as dγ/dz=0.58^+0.09_-0.13 (for Ω=0.3, Ω_Λ=0.7) or, in terms of a…

2002 • The Astrophysical Journal

eHST 157