Search Publications
Earliest phases of star formation (EPoS). Dust temperature distributions in isolated starless cores
Henning, Th.; Krause, O.; Balog, Z. +10 more
Context. Stars form by the gravitational collapse of cold and dense molecular cloud cores. Constraining the temperature and density structure of such cores is fundamental for understanding the initial conditions of star formation. We use Herschel observations of the thermal far-infrared (FIR) dust emission from nearby and isolated molecular cloud …
Herschel/PACS far-IR spectral imaging of a jet from an intermediate mass protostar in the OMC-2 region
Manoj, P.; Megeath, S. T.; Watson, D. M. +10 more
We present the first detection of a jet in the far-IR [O I] lines from an intermediate mass protostar. This jet was detected in a Herschel/PACS spectral mapping study in the [O I] lines of OMC-2 FIR 3 and FIR 4, two of the most luminous protostars in Orion outside of the Orion Nebula. The spatial morphology of the fine structure line emission reve…
Large dust gaps in the transitional disks of HD 100453 and HD 34282. Connecting the gap size to the spectral energy distribution and mid-infrared imaging
Tielens, A. G. G. M.; Khalafinejad, S.; Maaskant, K. M. +1 more
Context. The formation of dust gaps in protoplanetary disks is one of the most important signs of disk evolution and might indicate the formation of planets.
Aims: We aim to characterize the flaring disk structure around the Herbig Ae/Be stars HD 100453 and HD 34282. Their spectral energy distributions (SEDs) show an emission excess between 1…
Robust automatic photometry of local galaxies from SDSS. Dissecting the color magnitude relation with color profiles
Fumagalli, Michele; Fossati, Matteo; Consolandi, Guido +2 more
We present an automatic procedure to perform reliable photometry of galaxies on SDSS images. We selected a sample of 5853 galaxies in the Coma and Virgo superclusters. For each galaxy, we derive Petrosian g and I magnitudes, surface brightness and color profiles. Unlike the SDSS pipeline, our procedure is not affected by the well known shredding p…
Anomalous temporal behaviour of broadband Lyα observations during solar flares from SDO/EVE
Chamberlin, Phillip C.; Milligan, Ryan O.
Although it is the most prominent emission line in the solar spectrum, there has been a notable lack of studies devoted to variations in Lyα emission during solar flares in recent years. However, the few examples that do exist have shown Lyα emission to be a substantial radiator of the total energy budget of solar flares (of the order of 10%). It …
The origin of seed photons for Comptonization in the black hole binary Swift J1753.5-0127
Tsygankov, S.; Neustroev, V.; Veledina, A. +1 more
Aims: The black hole binary Swift J1753.5-0127 is providing a unique data set to study accretion flows. Various investigations of this system and of other black holes have not, however, led to an agreement on the accretion flow geometry or on the seed photon source for Comptonization during different stages of X-ray outbursts. We place constr…
Disc colours in field and cluster spiral galaxies at 0.5 ≲z ≲ 0.8
Aragón-Salamanca, Alfonso; Zaritsky, Dennis; Jablonka, Pascale +9 more
We present a detailed study of the colours of late-type galaxy discs for ten of the EDisCS galaxy clusters with 0.5 ≲ z ≲ 0.8. Our cluster sample contains 172 spiral galaxies, and our control sample is composed of 96 field disc galaxies. We deconvolved their ground-based V and I images obtained with FORS2 at the VLT with initial spatial resolution…
Gaia reference frame amid quasar variability and proper motion patterns in the data
Lindegren, L.; Hobbs, D.; Bachchan, R. K.
Context. Gaia's very accurate astrometric measurements will allow the optical realisation of the International Celestial Reference System to be improved by a few orders of magnitude. Several sets of quasars are used to define a kinematically stable non-rotating reference frame with the barycentre of the solar system as its origin. Gaia will also o…
The XXL Survey. XII. Optical spectroscopy of X-ray-selected clusters and the frequency of AGN in superclusters
Altieri, B.; Valtchanov, I.; Pierre, M. +13 more
Context. This article belongs to the first series of XXL publications. It presents multifibre spectroscopic observations of three 0.55 deg2 fields in the XXL Survey, which were selected on the basis of their high density of X-ray-detected clusters. The observations were obtained with the AutoFib2+WYFFOS (AF2) wide-field fibre spectrogra…
Linking low- to high-mass young stellar objects with Herschel-HIFI observations of water
Braine, J.; van Dishoeck, E. F.; Johnstone, D. +7 more
Context. Water probes the dynamics in young stellar objects (YSOs) effectively, especially shocks in molecular outflows. It is therefore a key molecule for exploring whether the physical properties of low-mass protostars can be extrapolated to massive YSOs, an important step in understanding the fundamental mechanisms regulating star formation.