Search Publications
Planck intermediate results. VIII. Filaments between interacting clusters
Böhringer, H.; Kneissl, R.; Bernard, J. -P. +205 more
Context. About half of the baryons of the Universe are expected to be in the form of filaments of hot and low-density intergalactic medium. Most of these baryons remain undetected even by the most advanced X-ray observatories, which are limited in sensitivity to the diffuse low-density medium.
Aims: The Planck satellite has provided hundreds …
GMASS ultradeep spectroscopy of galaxies at z ~ 2. VII. Sample selection and spectroscopy
Berta, S.; Cimatti, A.; Daddi, E. +12 more
Context. Ultra-deep imaging of small parts of the sky has revealed many populations of distant galaxies, providing insight into the early stages of galaxy evolution. Spectroscopic follow-up has mostly targeted galaxies with strong emission lines at z > 2 or concentrated on galaxies at z < 1.
Aims: The populations of both quiescent and a…
Vindicating single-T modified blackbody fits to Herschel SEDs
Bianchi, S.
I show here that the bulk of the dust mass in a galaxy can be equivalently estimated from i) the full spectral energy distribution of dust emission, using the approach of Draine & Li (2007, ApJ, 657, 810) that includes a distribution of dust grains and a range of interstellar radiation field intensities; ii) the emission in the wavelength rang…
Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220
Lutz, D.; Genzel, R.; Poglitsch, A. +15 more
We report on Herschel/PACS observations of absorption lines of OH+, H2O+ and H3O+ in NGC 4418 and Arp 220. Excited lines of OH+ and H2O+ with Elower of at least 285 and ~200 K, respectively, are detected in both sources, indicating radiative pumping …
DIGIT survey of far-infrared lines from protoplanetary disks. I. [O i], [C ii], OH, H2O, and CH+
Güdel, M.; Fedele, D.; Henning, Th. +10 more
We present far-infrared (50-200 µm) spectroscopic observations of young pre-main-sequence stars taken with Herschel/PACS as part of the DIGIT key project. The sample includes 16 Herbig AeBe and 4 T Tauri sources observed in SED mode covering the entire spectral range. An additional 6 Herbig AeBe and 4 T Tauri systems have been observed in SE…
A survey of young, nearby, and dusty stars conducted to understand the formation of wide-orbit giant planets. VLT/NaCo adaptive optics thermal and angular differential imaging
Lagrange, A. -M.; Desidera, S.; Bonnefoy, M. +7 more
Context. Over the past decade, direct imaging has confirmed the existence of substellar companions on wide orbits from their parent stars. To understand the formation and evolution mechanisms of these companions, their individual as well as the full population properties must be characterized.
Aims: We aim at detecting giant planet and/or bro…
Particle-physics constraints from the globular cluster M5: neutrino dipole moments
Weiss, A.; Stetson, P. B.; Catelan, M. +4 more
Stellar evolution is modified if energy is lost in a "dark channel" similar to neutrino emission. Comparing modified stellar evolution sequences with observations provides some of the most restrictive limits on axions and other hypothetical low-mass particles and on non-standard neutrino properties. In particular, a putative neutrino magnetic dipo…
The properties of the extended warm ionised gas around low-redshift QSOs and the lack of extended high-velocity outflows
Jahnke, K.; Husemann, B.; Sánchez, S. F. +1 more
We present a detailed analysis of a large sample of 31 low-redshift, mostly radio-quiet type 1 quasi-stellar objects (QSOs) observed with integral field spectroscopy to study their extended emission-line regions (EELRs). We focus on the ionisation state of the gas, size and luminosity of extended narrow line regions (ENLRs), which corresponds to t…
A revised radiometric calibration for the Hinode/EIS instrument
Del Zanna, G.
An assessment of the in-flight radiometric calibration of the Hinode EUV Imaging Spectrometer (EIS) is presented. This is done with the line ratio technique applied to a wide range of observations of the quiet Sun, active regions, and flares from 2006 until 2012. The best diagnostic lines and the relevant atomic data are discussed in detail. Radia…
OGLE-2002-BLG-360: from a gravitational microlensing candidate to an overlooked red transient
Soszyński, I.; Udalski, A.; Szymański, M. K. +9 more
Context. OGLE-2002-BLG-360 was discovered as a microlensing candidate by the OGLE-III project. The subsequent light curve, however, clearly showed that the brightening of the object could not have resulted from the gravitational microlensing phenomenon.
Aims: We aim to explain the nature of OGLE-2002-BLG-360 and its eruption observed in 2002-…