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Evidence for a Fast Decline in the Progenitor Population of Gamma-Ray Bursts and the Nature of Their Origin
Hurley, K.; Atteia, J. -L.; Stern, B. E.
We show that the source population of long gamma-ray bursts (GRBs) has declined by at least a factor of 12 (at the 90% confidence level) since the early stages of the universe (z~2-3). This result has been obtained using the combined BATSE and Ulysses GRB brightness distribution and the detection of four GRBs with known redshifts brighter than 10<…
An erupting macrospicule. Characteristics derived from SOHO-CDS spectroscopic observations
Bromage, G. E.; Parenti, S.; Bromage, B. J. I.
We report results from the analysis of a sequence of SOHO/CDS observations obtained off-limb in the south polar coronal hole on 6 March 1998. Three successive data sets were obtained with the Normal Incidence Spectrometer (NIS), the first of which showed a jet-like feature visible in the chromospheric and low transition region lines. The morpholog…
Linear polarization of the O VI lambda 1031.92 coronal line. I. Constraints on the solar wind velocity field vector in the polar holes
Bommier, V.; Raouafi, N. -E.; Lemaire, P. +1 more
In the first part of the present work, we report on the determination of the linear polarization parameters of the O VI lambda1031 .92 coronal line (hereafter O VI D2). Spectropolarimetric observations done by the SUMER spectrometer on board the spacecraft SoHO during minimum activity of the solar cycle (March, 1996) in the south corona…
Is TU UMi a W UMa-type system
Amado, P. J.; Olivares, I.; Rolland, A. +4 more
TU UMi is catalogued as a delta Scuti star, it was discovered by Hipparcos (ESA 1997). Analysis of photometric observations carried through the years 2001 and 2002 is presented. We obtain one only frequency that it is in agreement with it listed in the Hipparcos Catalogue. Using the derived uvbybeta indices, the most relevant physical parameters o…
Resolving the compact H II regions in N160A with HST
Schaerer, D.; Heydari-Malayeri, M.; Charmandaris, V. +4 more
Using high-resolution imaging with the Hubble Space Telescope, we study the Large Magellanic Cloud H II region N160A and uncover several striking features of this complex massive star-forming site. The two compact high excitation H II, blobs (HEBs) A1 and A2 are for the first time resolved and their stellar content and morphology is revealed. A1, …
Subaru optical observations of the old pulsar PSR B0950+08
Kawai, N.; Zharikov, S. V.; Shibanov, Yu. A. +6 more
We report the B band optical observations of an old (tau ~ 17.5 Myr) radiopulsar PSR B0950+08 obtained with the Suprime-Cam at the Subaru telescope. We detected a faint object, B=27fm07 +/-0.16. Within our astrometrical accuracy it coincides with the radio position of the pulsar and with the object detected earlier by Pavlov et al. (\cite{Pavlov})…
The complete far infrared spectroscopic survey of Herbig AeBe stars obtained by ISO-LWS
Benedettini, M.; Elia, D.; Lorenzetti, D. +4 more
The ISO-LWS archive has been systematically searched in order to obtain a complete far IR spectrophotometric survey of Herbig AeBe (HAEBE) stars. The investigated sample is constituted by 15 objects which, together with the 11 HAEBE we have published in two previous papers, represents about 25% of all the known HAEBE. This catalogue constitues an …
Solar cycle variation of the radiance and the global electron density of the solar corona
Llebaria, A.; Quemerais, E.; Lamy, P.
The question of the global activity of the solar corona, as a function of time and distance from the center of the Sun, is considered by analyzing SOHO/LASCO-C2 daily polarized images over four years, i.e., from the minimum to the rising phase of the 23rd solar cycle. After proper correction for instrumental polarization, they are combined to prod…
Near- and mid-infrared colours of star-forming galaxies in European Large Area ISO Survey fields
Serjeant, S.; Morel, T.; Gruppioni, C. +6 more
We present J- and K-band near-infrared (near-IR) photometry of a sample of mid-infrared (mid-IR) sources detected by the Infrared Space Observatory (ISO) as part of the European Large Area ISO Survey (ELAIS) and study their classification and star-forming properties. We have used the Preliminary ELAIS Catalogue for the 6.7-µm (LW2) and 15-&m…
The charge and velocity detector of the cosmic dust analyzer on Cassini
Kempf, S.; Srama, R.; Grün, E. +2 more
The cosmic dust analyzer aboard the Cassini spacecraft includes a charge and velocity detector which senses electric charges >10 -15 C of individual cosmic dust grains as they enter the instrument. Charge is an important property of each grain, because it affects its orbital dynamics and is a measure of its size. The duration and sha…