Search Publications
Signature of wide-spread clumping in B supergiant winds
Prinja, R. K.; Massa, D. L.
Aims: We seek to establish additional observational signatures of the effects of clumping in OB star winds. The action of clumping on strategic wind-formed spectral lines is tested to steer the development of models for clumped winds and thus improve the reliability of mass-loss determinations for massive stars.
Methods: The Siiv λλ1400 …
Kuiper belts around nearby stars
Fridlund, M.; Olofsson, G.; Eiroa, C. +10 more
Context. The existence of dusty debris disks around a large fraction of solar type main-sequence stars, inferred from excess far-IR and submillimetre emission compared to that expected from stellar photospheres, suggests that leftover planetesimal belts analogous to the asteroid- and comet reservoirs of the solar system are common.
Aims: Sens…
On the power spectrum of solar surface flows
Meunier, N.; Roudier, T.; Rieutord, M. +4 more
Context. The surface of the Sun provides us with a unique and very detailed view of turbulent stellar convection. Studying its dynamics can therefore help us make significant progress in stellar convection modelling. Many features of solar surface turbulence like the supergranulation are still poorly understood.
Aims: The aim of this work is …
The unusual N IV] -emitter galaxy GDS J033218.92-275302.7: star formation or AGN-driven winds from a massive galaxy at z = 5.56
Schaerer, D.; Dickinson, M.; Giavalisco, M. +8 more
Aims: We investigate the nature of the source GDS J033218.92-275302.7 at redshift ~5.56.
Methods: The spectral energy distribution of the source is well-sampled by 16 bands photometry from UV-optical (HST and VLT), near infrared, near infrared (VLT) to mid-infrared (Spitzer). The detection of a signal in the mid-infrared Spitzer/IRAC ban…
Herschel-ATLAS: Evolution of the 250 µm luminosity function out to z = 0.5
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +65 more
We have determined the luminosity function of 250 µm-selected galaxies detected in the ~14 deg2 science demonstration region of the Herschel-ATLAS project out to a redshift of z = 0.5. Our findings very clearly show that the luminosity function evolves steadily out to this redshift. By selecting a sub-group of sources within a fix…
A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey
Smith, M. D.; Natoli, P.; Paladini, R. +28 more
We present a first study of the star-forming compact dust condensations revealed by Herschel in the two 2° × 2° Galactic Plane fields centered at [ℓ, b] = [30°, 0°] and [ℓ, b] =[59°, 0°] , respectively, and observed during the science demonstration phase for the Herschel Infrared GALactic plane survey (Hi-GAL) key-project. Compact source catalogs …
High-resolution X-ray spectroscopy of the interstellar medium. XMM-Newton observation of the LMXB GS 1826-238
Kaastra, J. S.; Costantini, E.; Pinto, C. +1 more
Aims: The interstellar medium (ISM) has a multiphase structure characterized by gas, dust, and molecules. The gas can be found in different charge states: neutral, weakly ionized (warm) and highly ionized (hot). It is possible to probe the multiphase ISM through the observation of its absorption lines and edges in the X-ray spectra of backgro…
CoRoT opens a new era in hot B subdwarf asteroseismology. Detection of multiple g-mode oscillations in KPD 0629-0016
Auvergne, M.; Baudin, F.; Chaintreuil, S. +10 more
Context. The asteroseismic exploitation of long period, g-mode hot B subdwarf (sdB) pulsators has been a long sought objective undermined, thus far, by the difficulty of obtaining sufficiently precise and continuous time series data from the ground.
Aims: Fast photometry from space appears to be the only means of gathering the appropriate ast…
Herschel observations of the W43 ``mini-starburst''
Testi, L.; Zavagno, A.; Motte, F. +20 more
Aims: To explore the infrared and radio properties of one of the closest Galactic starburst regions.
Methods: Images obtained with the Herschel Space Observatory at wavelengths of 70, 160, 250, 350, and 500 µm using the PACS and SPIRE arrays are analyzed and compared with radio continuum VLA data and 8 µm images from the Spit…
``TNOs are Cool'': A survey of the trans-Neptunian region . III. Thermophysical properties of 90482 Orcus and 136472 Makemake
Fornasier, S.; Groussin, O.; Thomas, N. +32 more
Context. The goal of the Herschel open time programme “TNOs are Cool!” is to derive the physical and thermal properties for a large sample of Centaurs, and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects.
Aims: Based on observations of two targets we tried (i) to optimise the SPIRE observing …