Search Publications
The ISO 170 µm luminosity function of galaxies
Dole, H.; Lagache, G.; Puget, J. -L. +3 more
We constructed a local luminosity function (LF) of galaxies using a flux-limited sample (S170 ≥ 0.195~Jy) of 55 galaxies at z < 0.3 taken from the <sl>ISO</sl> FIRBACK survey at 170 µm. The overall shape of the 170-µm LF is found to be different from that of the total 60-µm LF (Takeuchi et al. 2003): the…
Properties of dust in the high-latitude translucent cloud L1780. I. Spatially distinct dust populations and increased dust emissivity from ISO observations
Juvela, M.; Lemke, D.; Lehtinen, K. +2 more
We have analyzed the properties of dust in the high galactic latitude translucent cloud Lynds 1780 using ISOPHOT maps at 100 µm and 200 µm and raster scans at 60 µm, 80 µm, 100 µm, 120 µm, 150 µm and 200 µm. In far-infrared (FIR) emission, the cloud has a single core that coincides with the maxima of…
X-ray continuum properties of GRB afterglows observed by XMM-Newton and Chandra
Piro, L.; Corsi, A.; Gendre, B.
We present a catalog of XMM-Newton and Chandra observations of gamma-ray burst (GRB) afterglows, reduced in a common way using the most up-to-date calibration files and software. We focus on the continuum properties of the afterglows. We derive the spectral and temporal decay indices for 16 bursts. We place constraints on the burst environment and…
Simulations of thermally broadened H I Ly α absorption arising in the warm-hot intergalactic medium
Richter, P.; Fang, T.; Bryan, G. L.
Recent far-ultraviolet (FUV) absorption line measurements of low-redshift quasars have unveiled a population of intervening broad H i Ly α absorbers (BLAs) with large Doppler parameters (b≥ 40 km s-1). If the large width of these lines is dominated by thermal line broadening, the BLAs may trace highly-ionized gas in the warm-hot interga…
Disentangling the synchrotron and inverse Compton variability in the X-ray emission of the intermediate BL Lacertae object S5 0716+71
Emmanoulopoulos, D.; Wagner, S. J.; Ferrero, E. +1 more
Context: .The possibility to detect simultaneously in the X-ray band the synchrotron and Inverse Compton (IC) emission of intermediate BL Lac objects offers the unique opportunity to study contemporaneously the low- and high-energy tails of the electron distribution in the jets of these sources.
Aims: .We attempted to disentangle the X-ray spe…
An XMM-Newton view of the young open cluster NGC 6231. I. The catalogue
Gosset, E.; Rauw, G.; Vreux, J. -M. +2 more
This paper is the first of a series dedicated to the X-ray properties of the young open cluster NGC 6231. Our data set relies on an XMM-Newton campaign of a nominal duration of 180 ks and reveals that NGC 6231 is very rich in the X-ray domain too. Indeed, 610 X-ray sources are detected in the present field of view, centered on the cluster core. Th…
Structural parameters from ground-based observations of newly discovered globular clusters in NGC 5128
Geisler, D.; Gómez, M.; Richtler, T. +3 more
We have investigated a number of globular cluster candidates from a recent wide-field study by Harris et al. (2004a, AJ, 128, 712) of the giant elliptical galaxy
ISO mid-infrared spectroscopy of Galactic Bulge AGB stars
Blommaert, J. A. D. L.; Ganesh, S.; Glass, I. S. +8 more
Aims.To study the nature of Bulge AGB stars and in particular their circumstellar dust, we have analysed mid-infrared spectra obtained with the ISOCAM CVF spectrometer in three Bulge fields.
Methods: .The ISOCAM 5-16.5 µm CVF spectra were obtained as part of the ISOGAL infrared survey of the inner Galaxy. A classification of the shape o…
Near infra-red spectroscopy of the asteroid 21 Lutetia. I. New results of long-term campaign
Barucci, M. A.; Fulchignoni, M.; Vernazza, P. +4 more
Aims.Investigation of the physical nature of the asteroid 21 Lutetia, target of Rosetta mission, is required for the completion of its ground-based science and in the frame of its future fly-by. Monitoring this object is essential in preparing the future encounter with the spacecraft.
Methods: .The asteroid was observed with SpeX/IRTF in the s…
A torque reversal of 4U 1907+09
Santangelo, A.; Rodriguez, J.; Wilms, J. +5 more
Aims.We present an analysis of the accreting X-ray pulsar system 4U 1907+09 based on INTEGRAL data. The main focus of this analysis is a study of the timing behavior of this source. In addition we also show an analysis of the 5-90 keV spectrum.
Methods: .The data were extracted using the official INTEGRAL software OSA 5.1. Timing analysis was …