Science Archives Publication System

Far Ultraviolet Spectroscopic Explorer and Space Telescope Imaging Spectrograph Observations of Intervening O VI Absorption Line Systems in the Spectrum of PG 0953+415

DOI: 10.1086/324288 Bibcode: 2002ApJ...564..631S

Savage, B. D.; Sembach, K. R.; Richter, P. +1 more

We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph (STIS) observations of the intergalactic medium toward the bright QSO PG 0953+415 (z_em=0.239). The FUSE spectra extend from 905 to 1187 Å and have a resolution of 25 km s^-1, while the STIS spectra cover 1150-1730 Å and have a res…

2002 • The Astrophysical Journal

eHST 129

Chandra observations of the luminous infrared galaxy NGC 3256

DOI: 10.1046/j.1365-8711.2002.05014.x Bibcode: 2002MNRAS.330..259L

Zezas, A.; Ward, M.; Lira, P. +2 more

We present a detailed analysis of high-resolution Chandra observations of the merger system NGC 3256, the most infrared-luminous galaxy in the nearby universe. The X-ray data show that several discrete sources embedded in complex diffuse emission contribute >~20 per cent of the total emission (L^{tot_{X\sim 8\times 10⁴¹\,erg\,s…}}

2002 • Monthly Notices of the Royal Astronomical Society

eHST 128

The Excitation and Metallicity of Galactic H II Regions from Infrared Space Observatory SWS Observations of Mid-Infrared Fine-Structure Lines

DOI: 10.1086/338125 Bibcode: 2002ApJ...566..880G

Pauldrach, A. W. A.; Feuchtgruber, Helmut; Lutz, Dieter +2 more

We present mid-infrared Infrared Space Observatory Short-Wavelength Spectrometer (ISO-SWS) observations of the fine-structure emissions lines [Ne II] 12.8 µm, [Ne III] 15.6 µm, [Ne III] 36.0 µm, [Ar II] 6.99 µm, [Ar III] 8.99 µm, [S III] 18.7 µm, [S III] 33.5 µm, and [S IV] 10.5 µm and the recombinat…

2002 • The Astrophysical Journal

ISO 128

Rapid Changes of Magnetic Fields Associated with Six X-Class Flares

DOI: 10.1086/341735 Bibcode: 2002ApJ...576..497W

Moon, Yong-Jae; Qiu, Jiong; Denker, Carsten +5 more

In this paper, we present the results of the study of six X-class flares. We found significant changes in the photospheric magnetic fields associated with all of the events. For the five events in 2001, when coronagraph data were available, all were associated with halo coronal mass ejections. Based on the analyses of the line-of-sight magnetogram…

2002 • The Astrophysical Journal

SOHO 128

The AGN contribution to mid-infrared surveys. X-ray counterparts of the mid-IR sources in the Lockman Hole and HDF-N

DOI: 10.1051/0004-6361:20011842 Bibcode: 2002A&A...383..838F

Altieri, B.; Elbaz, D.; Franceschini, A. +5 more

We provide constraints on the AGN contribution to the mid-IR extragalactic background light from a correlation analysis of deep X-ray and mid-IR observations in two regions centred on the Lockman Hole and Hubble Deep Field North (HDF-N). The Lockman region, of more than 200 square arcminutes, was observed by ISOCAM and XMM-Newton to a depth of 0.3…

2002 • Astronomy and Astrophysics

ISO XMM-Newton 127

Astrometry with the Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator δ Cephei

DOI: 10.1086/342014 Bibcode: 2002AJ....124.1695B

McArthur, B. E.; Franz, O. G.; Bradley, A. J. +16 more

We present an absolute parallax and relative proper motion for the fundamental distance scale calibrator δ Cep. We obtain these with astrometric data from FGS 3, a white-light interferometer on the Hubble Space Telescope (HST). Utilizing spectrophotometric estimates of the absolute parallaxes of our astrometric reference stars and constraining δ C…

2002 • The Astronomical Journal

eHST 127

Compact Star Clusters in Nearby Dwarf Irregular Galaxies

DOI: 10.1086/339181 Bibcode: 2002AJ....123.1454B

Elmegreen, Bruce G.; Hunter, Deidre A.; Billett, Olivia H.

Nearby dwarf irregular galaxies were searched for compact star clusters by using data from the Hubble Space Telescope archives. Eight of the 22 galaxies in our sample were found to host compact clusters of some type. Three of these have populous clusters, with M_V<-9.5 at a fiducial age of 10 Myr, and the same three also have super-st…

2002 • The Astronomical Journal

eHST 127

A Survey of Extended Radio Jets in Active Galactic Nuclei with Chandra and the Hubble Space Telescope: First Results

DOI: 10.1086/339859 Bibcode: 2002ApJ...571..206S

Maraschi, L.; Cheung, C. C.; Tavecchio, F. +5 more

We present the first results from an X-ray and optical survey of a sample of radio jets in active galactic nuclei with Chandra and the Hubble Space Telescope (HST). We focus here on the first six sources observed in X-ray, in four of which a bright X-ray jet was detected for the first time. In three out of the four cases, optical emission from the…

2002 • The Astrophysical Journal

eHST 127

Cosmic Shear and Power Spectrum Normalization with the Hubble Space Telescope

DOI: 10.1086/341666 Bibcode: 2002ApJ...572L.131R

Refregier, Alexandre; Rhodes, Jason; Groth, Edward J.

Weak lensing by large-scale structure provides a direct measurement of matter fluctuations in the universe. We report a measurement of this ``cosmic shear'' based on 271 Wide Field Planetary Camera 2 archival images from the Hubble Space Telescope Medium Deep Survey. Our measurement method and treatment of systematic effects were discussed in an e…

2002 • The Astrophysical Journal

eHST 127

Mass segregation in young compact star clusters in the Large Magellanic Cloud - II. Mass functions

DOI: 10.1046/j.1365-8711.2002.05218.x Bibcode: 2002MNRAS.331..245D

Mackey, A. D.; de Grijs, R.; Gilmore, G. F. +1 more

We review the complications involved in the conversion of stellar luminosities into masses and apply a range of mass-to-luminosity relations to our Hubble Space Telescope observations of the young Large Magellanic Cloud (LMC) star clusters NGC 1805 and 1818.

Both the radial dependence of the mass function (MF) and the dependence of the cluste…

2002 • Monthly Notices of the Royal Astronomical Society

eHST 126