Search Publications
The Algol binary system KZ Pavonis revisited
Erdem, A.; Budding, E.; Sürgit, D.
We present results from analysing new spectroscopic and photometric observations of the KZ Pav (IDS 20490-7048 A-BC) multiple system. High-resolution spectra were taken at the Mt John University Observatory in 2007 and 2008. Radial velocities for the close binary were determined from cross-correlation and spectral disentangling methods. The result…
Quantitative measure of evolution of bright cluster galaxies at moderate redshifts
Kembhavi, Ajit K.; Wadadekar, Yogesh; Vikram, Vinu +1 more
Using archival data from the Hubble Space Telescope, we study the quantitative morphological evolution of spectroscopically confirmed bright galaxies in the core regions of nine clusters ranging in redshift from z = 0.31 to 0.84. We use morphological parameters derived from two-dimensional bulge-disc decomposition to study the evolution. We find a…
Compton Degradation of Gamma-ray Line Emission from Radioactive Isotopes in the Classical Nova V2491 Cygni
Shigeyama, Toshikazu; Suzuki, Akihiro
To account for the non-thermal emission from the classical nova V2491 Cygni, we perform a series of numerical calculations of radiative transfer of γ-ray photons from the radioactive isotope 22Na in the matter ejected from a white dwarf. Using a simple wind model for the dynamical evolution of the ejecta and a Monte Carlo code, we calcu…
Root mean square variability properties of iron lines in Seyferts
Nandra, Kirpal; Bhayani, Shyam
We present an analysis of the rms variability spectra of a sample of 18 observations of 14 Seyfert galaxies observed by XMM-Newton, which exhibit sufficient variability and signal-to-noise ratio to examine the variations in the iron K band. The narrow core of the Kα line at 6.4keV, seen universally in Seyferts, shows minimal evidence for variabili…
Polycyclic Aromatic Hydrocarbon Emission from the Dust Lane of an Elliptical Galaxy with the Spitzer Infrared Spectrograph
Onaka, Takashi; Yamagishi, Mitsuyoshi; Sakon, Itsuki +5 more
Spitzer and AKARI observations have found that polycyclic aromatic hydrocarbons (PAHs) are present in nearby elliptical galaxies, but their spatial distributions are still unknown. In order to investigate their distributions, we performed deep spectral mapping observations of the PAH-detected elliptical galaxy NGC 4589, a merger remnant with a min…
Be/X-ray binary SXP6.85 undergoes large Type II outburst in the Small Magellanic Cloud
Haberl, F.; Udalski, A.; Coe, M. J. +6 more
The Small Magellanic Cloud (SMC) Be/X-ray binary pulsar SXP6.85 = XTE J0103-728 underwent a large Type II outburst beginning on 2008 August 10. The source was consistently seen for the following 20 weeks (MJD = 54688-54830). We present X-ray timing and spectroscopic analysis of the source as a part of our ongoing Rossi X-ray Timing Explorer (RXTE)…
Orientation of X-Ray Bright Points in the Quiet Sun
Kano, R.; Tsuneta, S.; Shibahashi, H. +1 more
Thanks to the high-resolution images from the X-ray telescope (XRT) aboard the Hinode satellite, X-ray bright points (XBPs) in the quiet region of the Sun are resolved and can be seen to have complex loop-like structures. We measure the orientation of such loop structures for 488 XBPs picked up in 26 snapshot X-ray images near the disk center. The…
Pre-main sequence stars in the stellar association N11 in the Large Magellanic Cloud
Chiosi, E.; Vallenari, A.; Sordo, R.
Context. Magellanic Clouds are of extreme importance to the study of the star formation process in low metallicity environments.
Aims: In this paper we report on the discovery of pre-main sequence candidates and young embedded stellar objects in N11 located in the Large Magellanic Cloud to cast light on the star formation scenario. We would l…
An analysis of outgassing pressure forces on the Rosetta orbiter using realistic 3D+t coma simulations
Mysen, E.; Rodionov, A. V.; Crifo, J. -F.
A model for the interaction between a multicomponent Maxwellian atmosphere and a spacecraft is described. Multidimensional, time-dependent gasdynamical simulations of the gas coma around the recently reconstructed aspherical rotating nucleus of comet 67P/C-G is used to analyze the outgassing pressure forces on the ESA spacecraft Rosetta. The force…
RAPID Products at the Cluster Active Archive
Kronberg, Elena A.; Daly, Patrick W.
The RAPID instrument on board the four Cluster spacecraft delivers 3-D distributions of energetic (≳ 30 keV) ion and electron flux for up to eight energy channels. To make this data set available to the general scientific community, both during the operations phase and beyond the end of the mission, the RAPID Team is delivering processed data to t…