Science Archives Publication System

A two-component ionized reflection model of MCG-6-30-15

DOI: 10.1046/j.1365-8711.2003.06533.x Bibcode: 2003MNRAS.342..239B

Vaughan, S.; Fabian, A. C.; Ballantyne, D. R.

Ionized reflection has often been considered as the explanation for the unusual Fe Kα variability observed in MCG-6-30-15. In this paper, we test this model using a 325-ks observation of MCG-6-30-15 by XMM-Newton and BeppoSAX. The data are fitted between 2.5 and 80 keV with the constant-density models of Ross & Fabian. The best-fitting ionized…

2003 • Monthly Notices of the Royal Astronomical Society

XMM-Newton 50

Soft X-ray emission lines in the afterglow spectrum of GRB 011211: A detailed XMM-Newton analysis

DOI: 10.1051/0004-6361:20030204 Bibcode: 2003A&A...403..463R

Watson, D.; O'Brien, P. T.; Reeves, J. N. +2 more

We report on an XMM-Newton observation of the X-ray afterglow of the Gamma Ray Burst GRB 011211, originally detected by Beppo-SAX on 11th December 2001. The early afterglow spectrum obtained by XMM-Newton, observed 11 hours after the initial burst, appeared to reveal decaying H-like Kalpha emission lines of Mg, Si, S, Ar and Ca, arising in enriche…

2003 • Astronomy and Astrophysics

XMM-Newton 50

Do bulges of early- and late-type spirals have different morphology?

DOI: 10.1051/0004-6361:20030720 Bibcode: 2003A&A...407...61F

Peletier, R. F.; Fathi, K.

We study HST/NICMOS H-band images of bulges of two equal-sized samples of early- (T_RC3 <= 3) and late-type spiral (mainly Sbc-Sc) galaxies matched in outer disk axis ratio. We find that bulges of late-type spirals are more elongated than their counterparts in early-type spirals. Using a KS-test we find that the two distributions are …

2003 • Astronomy and Astrophysics

eHST 50

Soft X-Ray Excess Emission in Clusters of Galaxies Observed with XMM-Newton

DOI: 10.1086/345830 Bibcode: 2003ApJ...584..716N

Bonamente, M.; Lumb, D.; Nevalainen, J. +1 more

We present results on the spectroscopic analysis of XMM-Newton EPIC data of the central 0.5 h^-1₅₀ Mpc regions of the clusters of galaxies Coma, A1795, and A3112. The temperature of the hot intracluster gas as determined by modeling the 2-7 keV PN and MOS data is consistent with that inferred from the Fe XXV/Fe XXVI line ratio…

2003 • The Astrophysical Journal

XMM-Newton 50

First results from the INTEGRAL galactic plane scans

DOI: 10.1051/0004-6361:20031325 Bibcode: 2003A&A...411L.349W

Strong, A. W.; Mereghetti, S.; Gehrels, N. +12 more

Scans of the Galactic plane performed at regular intervals constitute a key element of the guaranteed time observations of the INTEGRAL observing programme. These scans are done for two reasons: frequent monitoring of the Galactic plane in order to detect transient sources, and time resolved mapping of the Galactic plane in continuum and diffuse l…

2003 • Astronomy and Astrophysics

INTEGRAL 49

On the origin of the X-rays and the nature of accretion in NGC 4261

DOI: 10.1051/0004-6361:20031050 Bibcode: 2003A&A...408..949G

Brandt, W. N.; Gliozzi, M.; Sambruna, R. M.

We report on the X-ray properties of the radio galaxy NGC 4261, combining information from the XMM-Newton, Chandra, and BeppoSAX satellites. Goals of this study are to investigate the origin of the X-rays from this low-power radio galaxy and the nature of the accretion process onto the central black hole. The X-ray spectrum of t…

2003 • Astronomy and Astrophysics

XMM-Newton 49

Space Telescope Imaging Spectrograph Survey of Far-Ultraviolet Coronal Forbidden Lines in Late-Type Stars

DOI: 10.1086/345409 Bibcode: 2003ApJ...583..963A

Ayres, Thomas R.; Redfield, Seth; Harper, Graham M. +4 more

We describe an extensive search with the Space Telescope Imaging Spectrograph (STIS) for ultraviolet coronal (T>10⁶ K) forbidden lines in a sample of 29 F-M dwarfs, giants, and supergiants. Measuring coronal lines in the 1150-1700 Å band with STIS has important advantages of superior velocity resolution and an absolute wavelength cal…

2003 • The Astrophysical Journal

eHST 49

Absolute timing with IBIS, SPI and JEM-X aboard INTEGRAL. Crab main-pulse arrival times in radio, X-rays and high-energy gamma -rays

DOI: 10.1051/0004-6361:20031353 Bibcode: 2003A&A...411L..31K

Walter, R.; Foschini, L.; Kuiper, L. +1 more

We have verified the absolute timing capabilities of the high-energy instruments aboard INTEGRAL, i.e. the imager IBIS, the spectrometer SPI and the X-ray monitor JEM-X. Calibration observations of the Crab, contemporaneous with the Rossi X-ray Timing Explorer (RXTE), have been used to measure the absolute phase of the main pulse of the Crab pulse…

2003 • Astronomy and Astrophysics

INTEGRAL 49

The Physical Parameters, Excitation, and Chemistry of the Rim, Jets, and Knots of the Planetary Nebula NGC 7009

DOI: 10.1086/378496 Bibcode: 2003ApJ...597..975G

Corradi, Romano L. M.; Gonçalves, Denise R.; Mampaso, Antonio +1 more

We present long-slit optical spectra along the major axis of the planetary nebula NGC 7009. These data allow us to discuss the physical, excitation, and chemical properties of all the morphological components of the nebula, including its remarkable systems of knots and jets. The main results of this analysis are the following: (1) the electron tem…

2003 • The Astrophysical Journal

eHST 49

Core radius evolution of star clusters

DOI: 10.1046/j.1365-8711.2003.06749.x Bibcode: 2003MNRAS.343.1025W

Mackey, A. D.; Wilkinson, M. I.; Tout, C. A. +2 more

We use N-body simulations of star clusters to investigate the possible dynamical origins of the observed spread in core radius among intermediate-age and old star clusters in the Large Magellanic Cloud (LMC). Two effects are considered, a time-varying external tidal field and variations in primordial hard binary fraction. Simulations of clusters o…

2003 • Monthly Notices of the Royal Astronomical Society

eHST 49