Search Publications
Planck intermediate results. X. Physics of the hot gas in the Coma cluster
Böhringer, H.; Kneissl, R.; Dahle, H. +207 more
We present an analysis of Planck satellite data on the Coma cluster observed via the Sunyaev-Zeldovich effect. Thanks to its great sensitivity, Planck is able, for the first time, to detect SZ emission up to r ≈ 3 × R500. We test previously proposed spherically symmetric models for the pressure distribution in clusters against the azimu…
GOODS-Herschel: radio-excess signature of hidden AGN activity in distant star-forming galaxies
Daddi, E.; Elbaz, D.; Le Floc'h, E. +23 more
Context. A tight correlation exists between far-infrared and radio emission for star-forming galaxies (SFGs), which seems to hold out to high redshifts (z ≈ 2). Any excess of radio emission over that expected from star formation processes is most likely produced by an active galactic nucleus (AGN), often hidden by large amounts of dust and gas. Id…
"TNOs are Cool": A survey of the trans-Neptunian region. IX. Thermal properties of Kuiper belt objects and Centaurs from combined Herschel and Spitzer observations
Fornasier, S.; Groussin, O.; Lellouch, E. +14 more
Aims: The goal of this work is to characterize the ensemble thermal properties of the Centaurs / trans-Neptunian population.
Methods: Thermal flux measurements obtained with Herschel/PACS and Spitzer/MIPS provide size, albedo, and beaming factors for 85 objects (13 of which are presented here for the first time) by means of standard radi…
Gas fraction and star formation efficiency at z < 1.0
Braine, J.; Colina, L.; Walter, F. +3 more
After new observations of 39 galaxies at z ~ 0.6-1.0 obtained at the IRAM 30-m telescope, we present our full CO line survey covering the redshift range 0.2 < z < 1. Our aim is to determine the driving factors accounting for the steep decline in the star formation rate during this epoch. We study both the gas fraction, defined as Mgas
X-ray follow-ups of XSS J12270-4859: a low-mass X-ray binary with gamma-ray Fermi-LAT association
Mukai, K.; Belloni, T.; de Martino, D. +10 more
Context. XSS J1227.0-4859 is a peculiar, hard X-ray source recently positionally associated to the Fermi-LAT source 1FGL J1227.9-4852/2FGL J1227.7-4853. Multi-wavelength observations have added information on this source, indicating a low-luminosity low-mass X-ray binary (LMXB), but its nature is still unclear.
Aims: To progress in our unders…
Magnesium in the atmosphere of the planet HD 209458 b: observations of the thermosphere-exosphere transition region
Ehrenreich, D.; Lecavelier des Etangs, A.; Bourrier, V. +8 more
The planet HD 209458 b is one of the most well studied hot-Jupiter exoplanets. The upper atmosphere of this planet has been observed through ultraviolet/optical transit observations with H i observation of the exosphere revealing atmospheric escape. At lower altitudes just below the thermosphere, detailed observations of the Na i absorption line h…
Constraining turbulence and conduction in the hot ICM through density perturbations
Churazov, E.; Gaspari, M.
Turbulence and conduction can dramatically affect the evolution of baryons in the universe; current constraints are however rare and uncertain. Using 3D high-resolution hydrodynamic simulations, tracking both electrons and ions, we study the effects of turbulence and conduction in the hot intracluster medium. We show how the power spectrum of the …
Limits on intermediate-mass black holes in six Galactic globular clusters with integral-field spectroscopy
Kissler-Patig, M.; de Zeeuw, P. T.; Neumayer, N. +6 more
Context. The formation of supermassive black holes at high redshift still remains a puzzle to astronomers. No accretion mechanism can explain the fast growth from a stellar mass black hole to several billion solar masses in less than one Gyr. The growth of supermassive black holes becomes reasonable only when starting from a massive seed black hol…
Interstellar medium composition through X-ray spectroscopy of low-mass X-ray binaries
Kaastra, J. S.; Costantini, E.; Pinto, C. +1 more
Context. The diffuse interstellar medium (ISM) is an integral part of the evolution of the entire Galaxy. Metals are produced by stars and their abundances are the direct testimony of the history of stellar evolution. However, the interstellar dust composition is not well known and the total abundances are yet to be accurately determined.
Aim…
Water in star-forming regions with Herschel (WISH). III. Far-infrared cooling lines in low-mass young stellar objects
Liseau, R.; Fedele, D.; van Dishoeck, E. F. +22 more
Context. Understanding the physical phenomena involved in the earlierst stages of protostellar evolution requires knowledge of the heating and cooling processes that occur in the surroundings of a young stellar object. Spatially resolved information from its constituent gas and dust provides the necessary constraints to distinguish between differe…