Search Publications
The X-ray emission mechanism in the protostellar jet HH 154
Orlando, S.; Bonito, R.; Peres, G. +2 more
We study the mechanism causing the X-ray emission recently detected in protostellar jets, by performing a detailed modeling of the interaction between a supersonic jet originating from a young stellar object and the ambient medium, for various values of density contrast, ν, between the ambient density and the jet, and of Mach number, M; radiative …
Evolution and magnetic topology of the M 1.0 flare of October 22, 2002
Aulanier, G.; Schmieder, B.; Del Zanna, G. +2 more
In this paper we analyse an M 1.0 confined flare observed mainly during its gradual phase. We use the data taken during a coordinated observational campaign between ground based instruments (THEMIS and VTT) and space observatories (SoHO/CDS and MDI, TRACE and RHESSI). We use these multi-wavelength observations to study the morphology and evolution…
Dust enshrouded star-forming activity in Arp 299
Le Floc'h, E.; Sauvage, M.; Vigroux, L. +4 more
We present mid-infrared spectro-imaging (5-16 µm) observations of the infrared luminous interacting system Arp 299 (= Mrk 171 = IC 694+NGC 3690) obtained with the ISOCAM instrument aboard ISO. Our observations show that nearly 40% of the total emission at 7 and 15 µm is diffuse, originating from the interacting disks of the galaxies. M…
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…