Search Publications
Suzaku observation of the Galactic supernova remnant CTB 37A (G348.5+0.1)
Hudaverdi, M.; Ercan, E. N.; Sezer, A. +1 more
In this paper, we present the results of the observations of CTB 37A obtained with the X-ray imaging spectrometer onboard the Suzaku satellite. The X-ray spectrum of CTB 37A is fitted well by two components: a single-temperature ionization equilibrium component (VMEKAL), with solar abundances, an electron temperature of kTe∼ 0.6 keV and…
Studying the long-time variability of the Seyfert 2 galaxy NGC 4388 with INTEGRAL and Swift
Beckmann, V.; Soldi, S.; Neronov, A. +1 more
We present analysis results on the Seyfert 2 galaxy NGC 4388 based on 6 yr of INTEGRAL data combined with Swift/Burst Alert Telescope survey and Swift/X-Ray Telescope pointed observations. These data, taken from 2003 to 2009, allow us to study the broad-band properties of this active galactic nucleus in the 0.3-300 keV energy range. The continuum …
The halo and rings of the planetary nebula NGC 40 in the mid-infrared
Ramos-Larios, G.; Phillips, J. P.; Cuesta, L. C.
We present the imaging and spectroscopy of NGC 40 acquired using the Spitzer Space Telescope and the Infrared Space Observatory. These are used to investigate the nature of emission from the central nebular shell, from the nebular halo and from the associated circumnebular rings. It is pointed out that a variety of mechanisms may contribute to the…
Pressure from dark matter annihilation and the rotation curve of spiral galaxies
Ascasibar, Y.; Wechakama, M.
The rotation curves of spiral galaxies are one of the basic predictions of the cold dark matter paradigm, and their shape in the innermost regions has been hotly debated over the last decades. The present work shows that dark matter annihilation into electron-positron pairs may affect the observed rotation curve by a significant amount. We adopt a…
Candidate subdwarfs and white dwarfs from the 2MASS, Tycho-2, XPM and UCAC3 catalogues
Gontcharov, George A.; Bajkova, Anisa T.; Fedorov, Peter N. +1 more
Photometry from the Two-Micron All-Sky Survey (2MASS), United States Naval Observatory CCD Astrograph Catalog (UCAC3) and SuperCosmos catalogues, together with proper motions from the Tycho-2, Kharkiv Proper Motions (XPM) and UCAC3 catalogues, is used to select all-sky samples of 28 candidate white dwarfs, 1826 evolved and 7641 unevolved subdwarfs…
Spectra from the shocked nebulae revealing turbulence near the Galactic Centre
Contini, M.; Goldman, I.
The spectra emitted from clouds near the Galactic Centre (GC) are investigated calculating the UV-optical-IR lines using the physical parameters and the element abundances obtained by the detailed modelling of mid-IR observations. Graphical representation of the spectra reveals strong lines. Characteristic line ratios calculated at the nebula prov…
Debris disc candidates in systems with transiting planets
Krivov, A. V.; Löhne, T.; Neuhäuser, R. +2 more
Debris discs are known to exist around many planet-host stars, but no debris dust has been found so far in systems with transiting planets. Using publicly available catalogues, we searched for infrared excesses in such systems. In the recently published Wide-field Infrared Survey Explorer catalogue, we found 52 stars with transiting planets. Two s…
Sample of LMXBs in the Galactic bulge - I. Optical and near-infrared constraints from the Virtual Observatory
Zolotukhin, Ivan Yu.; Revnivtsev, Mikhail G.
We report on the archival optical and near-infrared observations of six low-mass X-ray binaries situated in the Galactic bulge. We process several recent Chandra and XMM-Newton as well as Einstein data sets of binary systems suspected to be ultracompact, which give us arcsec-scale positional uncertainty estimates. We then undertake a comprehensive…
XMM-Newton and INTEGRAL observations of the very faint X-ray transient IGR J17285-2922/XTE J1728-295 during the 2010 outburst
Götz, D.; Mereghetti, S.; Sidoli, L. +2 more
We report the first broad-band (0.5-150 keV) simultaneous X-ray observations of the very faint X-ray transient IGR J17285-2922/XTE J1728-295 performed with the XMM-Newton and INTEGRAL satellites during its last outburst, started on 2010 August 28. XMM-Newton observed the source on 2010 September 9-10 for 22 ks. INTEGRAL observations were part of t…
Model for Cameron-band emission in comets: a case for the EPOXI mission target comet 103P/Hartley 2
Bhardwaj, Anil; Raghuram, Susarla
The CO2 production rate has been derived in comets using Cameron-band (a3Π→X1Σ) emission of CO molecules, assuming that photodissociative excitation of CO2 is the main production mechanism of CO in the a3Π metastable state. We have developed a model for the production and loss of CO(a3