Search Publications
Dynamical and chemical evolution of NGC 1569
Matteucci, F.; Recchi, S.; Hensler, G. +1 more
Blue Compact Dwarf and Dwarf Irregular galaxies are generally believed to be unevolved objects, due to their blue colors, compact appearance and large gas fractions. Many of these objects show an ongoing intense burst of star formation or have experienced it in the recent past. By means of 2-D hydrodynamical simulations, coupled with detailed chem…
Dwarf novae in the Hamburg quasar survey: rarer than expected
Gänsicke, B. T.; Hagen, H. -J.; Engels, D. +12 more
Aims.We report the discovery of five new dwarf novae that were spectroscopically identified in the Hamburg Quasar Survey (HQS), and discuss the properties of the sample of new dwarf novae from the HQS.
Methods.Follow-up time-resolved spectroscopy and photometry have been obtained to characterise the new systems.
Results.The orbital periods d…
The role of the LIRG and ULIRG phases in the evolution of Ks-selected galaxies
Le Floc'h, E.; Dole, H.; Lagache, G. +5 more
Aims.We investigate the role of the luminous infrared galaxy (LIRG) and ultra-luminous infrared galaxy (ULIRG) phases in the evolution of K_s-selected galaxies and, in particular, Extremely Red Galaxies (ERGs).
Methods: .With this aim, we compare the properties of a sample of 2905 K_s<21.5 (Vega mag) galaxies in the GOODS/CDFS with the sub-…
SS 433: a phenomenon imitating a Wolf-Rayet star
Ábrahám, P.; Fuchs, Y.; Koch Miramond, L.
We present mid-infrared (2-12 µm) spectra of the microquasar SS 433 obtained with the Infrared Space Observatory (spectroscopic mode of ISOPHOT and ISOCAM). We compare them to the spectra of four Wolf-Rayet stars: WR 78, WR 134, WR 136, and WR 147 in the same wavelength range. The mid-infrared spectrum of SS 433 mainly shows ion{H}{i} and io…
An XMM-Newton survey of the Local Group galaxy M 33 - variability of the detected sources
Pietsch, W.; Haberl, F.; Hatzidimitriou, D. +3 more
We present an analysis of the individual observations of a deep XMM-Newton survey of the Local Group spiral galaxy M 33. We detected a total of 350 sources with fluxes (in the 0.2-4.5 keV energy band) in the range 6.7 × 10-16-1.5 × 10-11 erg s-1. This comprehensive study considers flux variability, spectral charact…
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…