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A multiwavelength study of the S 106 region. II. Characteristics of the photon dominated region
Schneider, N.; Stutzki, J.; Kramer, C. +3 more
The O star S 106 IR powers a bright, spatially extended 10'x 3' (1.75x 0.5 pc at a distance of 600 pc) photon dominated region (PDR) traced by our observations of FIR fine structure lines and submm molecular transitions. The [C II] 158 mu m, [C I] 609 and 370 mu m, CO 7->6, and CO 4->3 measurements probe the large scale (1.2 pc) PDR emission…
The X-ray afterglow of GRB 030329
Ghirlanda, G.; Ghisellini, G.; Tiengo, A. +3 more
We report on XMM and XTE observations of the bright (fluence ~ 10-4 erg cm-2) and nearby (z=0.1685) Gamma-Ray Burst \gr associated to SN2003dh. The first XTE observation, 5 hours after the burst, shows a flux decreasing with time as a power law with index 0.9+/-0.3. Such a decay law is only marginally consistent with a furthe…
Soft X-ray emission lines in the afterglow spectrum of GRB 011211: A detailed XMM-Newton analysis
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…
Do bulges of early- and late-type spirals have different morphology?
Peletier, R. F.; Fathi, K.
We study HST/NICMOS H-band images of bulges of two equal-sized samples of early- (TRC3 <= 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 …
First results from the INTEGRAL galactic plane scans
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…
On the origin of the X-rays and the nature of accretion in NGC 4261
Brandt, W. N.; Gliozzi, M.; Sambruna, R. M.
We report on the X-ray properties of the radio galaxy
Absolute timing with IBIS, SPI and JEM-X aboard INTEGRAL. Crab main-pulse arrival times in radio, X-rays and high-energy gamma -rays
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…
Spatially-resolved spectrophotometric analysis and modelling of the Superantennae
Berta, S.; Fritz, J.; Franceschini, A. +2 more
We have performed spatially-resolved spectroscopy of the double-nucleated Ultra-Luminous Infrared Galaxy IRAS 19254-7245, ``the Superantennae'', along the line connecting the two nuclei. These data are analysed with a spectral synthesis code, to derive the star formation and extinction properties of the galaxy. The star formation history (SFH) of …
The dust disk of HR 4049. Another brick in the wall
Dominik, C.; van Winckel, H.; Dullemond, C. P. +1 more
We present the Spectral Energy Distribution of HR 4049 based on literature data and new continuum measurements at 850 µm . The SED shows variable absorption in the UV, and a large IR excess, both caused by circumstellar dust. The shape of the IR excess from 1 µm all the way down to 850 µm can be nearly perfectly fitted with a sin…
Amplitude and orientation of prominence magnetic fields from constant-alpha magnetohydrostatic models
Aulanier, G.; Démoulin, P.
We analyze outputs from three-dimensional models for three observed filaments, which belong to the quiescent, intermediate and plage class respectively. Each model was calculated from a constant-alpha magnetohydrostatic extrapolation, assuming that the prominence material is located in magnetic dips, so that the field is nearly horizontal througho…