Search Publications
Herschel-SPIRE observations of the disturbed galaxy NGC 4438
Elbaz, D.; Bock, J. J.; Clements, D. L. +56 more
We present Herschel-SPIRE observations of the perturbed galaxy NGC 4438 in the Virgo cluster. These images reveal the presence of extra-planar dust up to ~4-5 kpc away from the galaxy's disk. The dust closely follows the distribution of the stripped atomic and molecular hydrogen, supporting the idea that gas and dust are perturbed in a similar fas…
Direct estimate of cirrus noise in Herschel Hi-GAL images
Miville-Deschênes, M. -A.; Bernard, J. -P.; Martin, P. G. +17 more
In Herschel images of the Galactic plane and many star forming regions, a major factor limiting our ability to extract faint compact sources is cirrus confusion noise, operationally defined as the “statistical error to be expected in photometric measurements due to confusion in a background of fluctuating surface brightness”. The histogram of the …
Herschel observations of EXtra-Ordinary Sources (HEXOS): Observations of H2O and its isotopologues towards Orion KL
Menten, K. M.; Falgarone, E.; Martin, P. G. +49 more
We report the detection of more than 48 velocity-resolved ground rotational state transitions of H_216O, H_218O, and H_217O - most for the first time - in both emission and absorption toward Orion KL using Herschel/HIFI. We show that a simple fit, constrained to match the known emission and absorption components al…
Hipparcos preliminary astrometric masses for the two close-in companions to HD 131664 and HD 43848. A brown dwarf and a low-mass star
Sozzetti, A.; Desidera, S.
Context. Several mechanisms for forming brown dwarfs have been proposed, which today are not believed to be mutually exclusive. Among the fundamental characteristics of brown dwarfs that are intrinsically tied to their origins, multiplicity is particularly relevant. Any successful determination of the actual mass for such objects in any systems is…
XMM-Newton and SUZAKU detection of an X-ray emitting shell around the pulsar wind nebula G54.1+0.3
Bocchino, F.; Bandiera, R.; Gelfand, J.
Context. X-ray observations have proven to be very effective in detecting previously unknown supernova remnant shells around pulsar wind nebulae (PWNe), and in these cases the characteristics of the shell provide information about the evolutionary stage of the embedded PWN. However, it is not clear why some PWNe are “naked”.
Aims: We perform …
The distribution of water in the high-mass star-forming region NGC 6334 I
Falgarone, E.; Maret, S.; Henning, T. +66 more
Aims: We present observations of twelve rotational transitions of H_216O, H_218O, and H_217O toward the massive star-forming region NGC 6334 I, carried out with Herschel/HIFI as part of the guaranteed time key program Chemical HErschel Surveys of Star forming regions (CHESS). We analyze these observations to o…
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars
Magain, P.; Sluse, D.; Chantry, V.
Aims: We attempt to place very accurate positional constraints on seven gravitationally lensed quasars currently being monitored by the COSMOGRAIL collaboration, and shape parameters for the light distribution of the lensing galaxy. We attempt to determine simple mass models that reproduce the observed configuration and predict time delays. W…
A multiwavelength strong lensing analysis of baryons and dark matter in the dynamically active cluster AC 114
Sereno, M.; Jetzer, Ph.; Lubini, M.
Context. Strong lensing studies can provide detailed mass maps of the inner regions even in dynamically active galaxy clusters.
Aims: We illustrate the important role of a proper modelling of the intracluster medium, i.e., the main baryonic component. We demonstrate that the addition of a new contribution accounting for the gas can increase t…
100 µm and 160 µm emission as resolved star-formation rate estimators in M 33 (HERM33ES)
Boquien, M.; Braine, J.; Calzetti, D. +17 more
Context. Over the past few years several studies have provided estimates of the SFR (star-formation rate) or the total infrared luminosity from just one infrared band. However these relations are generally derived for entire galaxies, which are known to contain a large scale diffuse emission that is not necessarily related to the latest star-forma…
Is the solar convection zone in strict thermal wind balance?
Antia, H. M.; Brun, A. S.; Chitre, S. M.
Context. The solar rotation profile is conical rather than cylindrical as it could be expected from classical rotating fluid dynamics (e.g. Taylor-Proudman theorem). Thermal coupling to the tachocline, baroclinic effects and latitudinal transport of heat have been suggested to explain this peculiar state of rotation.
Aims: To test the validit…