Search Publications
The Herschel Space Observatory view of dust in M81
Elbaz, D.; Bock, J. J.; Clements, D. L. +57 more
We use Herschel Space Observatory data to place observational constraints on the peak and Rayleigh-Jeans slope of dust emission observed at 70-500 µm in the nearby spiral galaxy M81. We find that the ratios of wave bands between 160 and 500 µm are primarily dependent on radius but that the ratio of 70 to 160 µm emission shows no …
``Comets'' orbiting a black hole
Maiolino, R.; Elvis, M.; Fabbiano, G. +6 more
We use a long (300 ks), continuous Suzaku X-ray observation of the active nucleus in NGC 1365 to investigate the structure of the circumnuclear broad line region (BLR) clouds through their occultation of the X-ray source. The variations of the absorbing column density and of the covering factor indicate that the clouds surrounding the black hole a…
The Great Observatories Origins Deep Survey. VLT/ISAAC near-infrared imaging of the GOODS-South field
Cesarsky, C.; Dickinson, M.; Rosati, P. +5 more
Aims: We present the final public data release of the VLT/ISAAC near-infrared imaging survey in the GOODS-South field. The survey covers an area of 172.5, 159.6 and 173.1 arcmin{}^2 in the J, H, and K_s bands, respectively. For point sources total limiting magnitudes of J=25.0, H=24.5, and K_s=24.4 (5σ, AB) are reached within 75% of the surve…
The inner halo of M 87: a first direct view of the red-giant population
Blakeslee, J. P.; Flynn, C.; Harris, W. E. +1 more
An unusually deep (V, I) imaging dataset for the Virgo supergiant M 87 with the Hubble Space Telescope ACS successfully resolves its brightest red-giant stars, reaching MI(lim) = -2.5. After assessing the photometric completeness and biasses, we use this material to estimate the metallicity distribution for the inner halo of M 87, findi…
The writhe of helical structures in the solar corona
Török, T.; Kliem, B.; Berger, M. A.
Context. Helicity is a fundamental property of magnetic fields, conserved in ideal MHD. In flux rope geometry, it consists of twist and writhe helicity. Despite the common occurrence of helical structures in the solar atmosphere, little is known about how their shape relates to the writhe, which fraction of helicity is contained in writhe, and how…
The Herschel first look at protostars in the Aquila rift
Prusti, T.; Olofsson, G.; Abergel, A. +40 more
As part of the science demonstration phase of the Herschel mission of the Gould Belt key program, the Aquila rift molecular complex has been observed. The complete ~ 3.3° × 3.3° imaging with SPIRE 250/350/500 µm and PACS 70/160 µm allows a deep investigation of embedded protostellar phases, probing of the dust emission from warm inner …
Dissecting the cosmic infra-red background with Herschel/PEP
Berta, S.; Magnelli, B.; Nordon, R. +34 more
The constituents of the cosmic IR background (CIB) are studied at its peak wavelengths (100 and 160 µm) by exploiting Herschel/PACS observations of the GOODS-N, Lockman Hole, and COSMOS fields in the PACS evolutionary probe (PEP) guaranteed-time survey. The GOODS-N data reach 3σ depths of ~3.0 mJy at 100 µm and ~5.7 mJy at 160 µm…
The Herschel Virgo Cluster Survey. I. Luminosity function
Bomans, D. J.; Bianchi, S.; Fritz, J. +27 more
We describe the Herschel Virgo Cluster Survey (HeViCS) and the first data obtained as part of the science demonstration phase (SDP). The data cover a central 4×4 sq deg region of the cluster. We use SPIRE and PACS photometry data to produce 100, 160, 250, 350 and 500 µm luminosity functions (LFs) for optically bright galaxies that are select…
How to deal with measurement errors and lacking data in nonlinear force-free coronal magnetic field modelling?
Inhester, B.; Wiegelmann, T.
Context. The measured solar photospheric magnetic field vector is extrapolated into the solar corona under the assumption of a force-free plasma. In the generic case this problem is nonlinear.
Aims: We aim to improve an algorithm for computing the nonlinear force-free coronal magnetic field. We are in particular interested to incorporate meas…
A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
Eiroa, C.; Montesinos, B.; Montes, D. +2 more
Context. Nearby late-type stars are excellent targets for seeking young objects in stellar associations and moving groups. The origin of these structures is still misunderstood, and lists of moving group members often change with time and also from author to author. Most members of these groups have been identified by means of kinematic criteria, …