Search Publications
XMM-Newton witness of M 86 X-ray metamorphosis
Finoguenov, A.; Pietsch, W.; Aschenbach, B. +1 more
The environmental influence of cluster media on its member galaxies, known as Butcher-Oemler effect, has recently been subject to revision due to numerous observations of strong morphological transformations occurring outside the cluster virial radii, caused by some unidentified gas removal processes. In this context we present new XMM-Newton obse…
An ISOCAM survey through gravitationally lensing galaxy clusters. II. The properties of infrared galaxies in the A2218 field
Kneib, J. -P.; Altieri, B.; Kessler, M. F. +10 more
We have observed the cluster Abell 2218 (z=0.175) with ISOCAM on board the Infrared Space Observatory using two filters, LW2 and LW3, with reference wavelengths of 6.7 and 14.3 µm, respectively. We detected 76 sources down to 54 and 121 µJy (50% completeness levels) at 6.7 and 14.3 µm, respectively. All these sources have visible…
X-ray spectral evolution of SAX J1747.0-2853 during outburst activity and confirmation of its transient nature
Ubertini, P.; Bazzano, A.; Heise, J. +6 more
SAX J1747.0-2853 is an X-ray transient which exhibited X-ray outbursts yearly between 1998 and 2001, and most probably also in 1976. The outburst of 2000 was the longest and brightest. We have analyzed X-ray data sets that focus on the 2000 outburst and were obtained with BeppoSAX, XMM-Newton and RXTE. The data cover unabsorbed 2-10 keV fluxes bet…
The potential of INTEGRAL for the detection of high redshift GRBs
Westergaard, N. J.; Lund, N.; Gorosabel, J. +2 more
We discuss INTEGRAL's ability to detect a high redshift population of Gamma-Ray Bursts (GRBs) in comparison to other high-energy missions. Emphasis is placed on the study of the relative capabilities of IBIS on board INTEGRAL with respect to SWIFT and HETE 2 in detecting a high redshift population of GRBs. We conclude that, if the GRB rate is prop…
Nuclear star formation in NGC 6240
Gallagher, J. S.; de Grijs, R.; Pasquali, A.
We have made use of archival HST BVIJH photometry to constrain the nature of the three discrete sources, A1, A2 and B1, identified in the double nucleus of NGC 6240. STARBURST99 models have been fitted to the observed colours, under the assumption, first, that these sources can be treated as star clusters (i.e. single, instantaneous episodes of st…
On the widths of the Mg X lines near 60 nm in the corona
Dwivedi, B. N.; Wilhelm, K.; Teriaca, L.
We examine the line widths of both components of the Mg X 2s 2S1/2-2p 2P1/2,3/2 doublet at 60.98 nm and 62.50 nm in the low corona of the quiet Sun, and find that the Doppler width (i.e. half 1/e width) broadens from Δ λD ≈ 8.2 pm to ≈9.5 pm (with an estimated relative standard uncertainty of …
Dust in 3CR radio galaxies: On the FR 1 - FR 2 difference
Meisenheimer, K.; Siebenmorgen, R.; Klaas, U. +4 more
We compare three 3CR samples of 11 FR 1 galaxies, 17 FR 2 galaxies and 18 lobe-dominated quasars contained in the ISO Data Archive. In contrast to the powerful FR 2 galaxies with edge-brightened lobes, the low radio power FR 1 galaxies in our sample do not exhibit any high MIR or FIR dust luminosity, which is typical for a buried, intrinsically mo…
86 GHz SiO maser survey of late-type stars in the inner Galaxy. II. Infrared photometry of the SiO target stars
Menten, K. M.; Omont, A.; Habing, H. J. +2 more
We present a compilation and study of DENIS, 2MASS, ISOGAL, MSX and IRAS 1-25 µm photometry for a sample of 441 late-type stars in the inner Galaxy, which we previously searched for 86 GHz SiO maser emission \citep{messineo02}. The comparison of the DENIS and 2MASS J and KS magnitudes shows that most of the SiO targets are indeed …
The configuration of simple short-duration solar microwave bursts
Nindos, A.; Kundu, M. R.; Grechnev, V. V.
Using data from the Nobeyama Radioheliograph (NoRH) we study the source configuration of four simple short-duration 17 and 34 GHz bursts which have also been observed partially by the Yohkoh Soft X-ray Telescope (SXT). Two events are consistent with a single flaring loop configuration. In one of them the flaring loop is resolved in the SXT images.…
A variable ultra-luminous X-ray source in the colliding galaxy NGC 7714
Motch, C.; Soria, R.
We studied the colliding galaxy NGC 7714 with two XMM-Newton observations, six months apart. The galaxy contains two bright X-ray sources: we show that they have different physical nature. The off-nuclear source is an accreting compact object, one of the brightest ultraluminous X-ray sources (ULXs) found to date. It showed spectral and luminosity …