Science Archives Publication System

Iron Abundance in the Intracluster Medium at High Redshift

DOI: 10.1086/376731 Bibcode: 2003ApJ...593..705T

Tozzi, P.; Mainieri, V.; Rosati, P. +3 more

We present the analysis of the X-ray spectra of 18 distant clusters of galaxies with redshift 0.3<z<1.3. Most of them were observed with the Chandra satellite in long exposures ranging from 36 to 180 ks. For two of the z>1 clusters, we also use deep XMM-Newton observations. Overall, these clusters probe the temperature range 3keV<~kT&l…

2003 • The Astrophysical Journal

XMM-Newton 107

Multiwavelength observations revealing the evolution of the outburst of the black hole XTE J1118+480

DOI: 10.1111/j.1365-2966.2003.07115.x Bibcode: 2003MNRAS.346..689C

Chaty, S.; Cui, W.; Shrader, C. R. +3 more

We report multiwavelength observations of the soft X-ray transient XTE J1118+480, which we observed with UKIRT, Hubble Space Telescope (HST), RXTE, Extreme Ultraviolet Explorer (EUVE) and many other instruments and facilities. Adding radio (Ryle Telescope, VLA), submillimetre (JCMT) and X-ray (Chandra and SAX) data from the literature, we assemble…

2003 • Monthly Notices of the Royal Astronomical Society

eHST 107

Hubble Space Telescope Paα and 1.9 Micron Imaging of Sagittarius A West

DOI: 10.1086/376790 Bibcode: 2003ApJ...594..294S

Scoville, N. Z.; Yusef-Zadeh, F.; Stolovy, S. R. +2 more

We present Hubble Space Telescope/NICMOS images at 0.2" resolution (Nyquist-sampled in the central 19") of the H I Paα emission line in a 70^''(α)×90^''(δ) region of the Galactic center centered on the nonthermal radio source Sgr A*. The majority of the emission arises from ionized gas in the minispiral in the central parsec. P…

2003 • The Astrophysical Journal

eHST 106

Surface brightness profiles and structural parameters for globular clusters in the Fornax and Sagittarius dwarf spheroidal galaxies

DOI: 10.1046/j.1365-8711.2003.06275.x Bibcode: 2003MNRAS.340..175M

Mackey, A. D.; Gilmore, G. F.

We present radial surface brightness profiles for all five globular clusters in the Fornax dwarf spheroidal galaxy, and for the four present members of the Sagittarius dwarf spheroidal galaxy. These profiles are derived from archival Hubble Space Telescope observations, and have been calculated using the same techniques with which we measured prof…

2003 • Monthly Notices of the Royal Astronomical Society

eHST 106

Formation scenarios for the young stellar associations between galactic longitudes l = 280degr - 360degr

DOI: 10.1051/0004-6361:20030581 Bibcode: 2003A&A...404..913S

Dias, W. S.; Lépine, J. R. D.; Sartori, M. J.

We investigate the spatial distribution, the space velocities and age distribution of the pre-main sequence (PMS) stars belonging to Ophiuchus, Lupus and Chamaeleon star-forming regions (SFRs), and of the young early-type star members of the Scorpius-Centaurus OB association. These young stellar associations extend over the galactic longitude rang…

2003 • Astronomy and Astrophysics

Hipparcos 106

Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae

DOI: 10.1051/0004-6361:20030742 Bibcode: 2003A&A...406.1019N

Frémat, Y.; Neiner, C.; Wiersema, K. +5 more

zeta Cas is a B2 IV star with vsin i = 17 km s^-1. Time-resolved circular spectropolarimetric observations of zeta Cas obtained in 2001 and 2002 with the Musicos échelle spectropolarimeter at the 2 m Télescope Bernard Lyot (TBL) show a sinusoidally varying longitudinal magnetic field with a strength …

2003 • Astronomy and Astrophysics

IUE 106

The Nuclear Regions of the Seyfert Galaxy NGC 4151: Parsec-Scale H I Absorption and a Remarkable Radio Jet

DOI: 10.1086/345356 Bibcode: 2003ApJ...583..192M

Mundell, C. G.; Pedlar, A.; Wrobel, J. M. +1 more

Sensitive high angular and linear resolution radio images of the 240 pc radio jet in NGC 4151, imaged at linear resolutions of 0.3-2.6 pc using the VLBA and phased VLA at λ21 cm, are presented and reveal for the first time a faint, highly collimated jet (diameter <~1.4 pc) underlying discrete components, seen in lower resolution MERLIN and VLA …

2003 • The Astrophysical Journal

eHST 105

A Survey for Circumstellar Disks around Young Substellar Objects

DOI: 10.1086/345895 Bibcode: 2003ApJ...585..372L

Tokunaga, Alan T.; Liu, Michael C.; Najita, Joan

We have completed the first systematic survey for disks around spectroscopically identified young brown dwarfs and very low mass stars. For a sample of 38 very cool objects in IC 348 and Taurus, we have obtained L'-band (3.8 µm) imaging with sufficient sensitivity to detect objects with and without disks. The sample should be free of selecti…

2003 • The Astrophysical Journal

eHST 105

The INTEGRAL IBIS/ISGRI System Point Spread Function and Source Location Accuracy

DOI: 10.1051/0004-6361:20031584 Bibcode: 2003A&A...411L.179G

Goldoni, P.; Rodriguez, J.; Foschini, L. +5 more

The imager on board INTEGRAL (IBIS) presently provides the most detailed sky images ever obtained at energies above 30 keV. The telescope is based on a coded aperture imaging system which allows to obtain sky images in a large field of view (29^deg x 29^deg) with an angular resolution of 12'. The System Point Spread Function of…

2003 • Astronomy and Astrophysics

INTEGRAL 105

Chandra X-Ray Observations of the Spiral Galaxy M81

DOI: 10.1086/345084 Bibcode: 2003ApJS..144..213S

Wu, Kinwah; Tennant, Allyn F.; Swartz, Douglas A. +3 more

A Chandra X-Ray Observatory ACIS-S imaging observation is used to study the population of X-ray sources in the nearby Sab galaxy M81 (NGC 3031). A total of 177 sources are detected with 124 located within the D₂₅ isophote to a limiting X-ray luminosity of ~3×10³⁶ ergs s^-1. Source positions, count rates, luminositie…

2003 • The Astrophysical Journal Supplement Series

eHST 105