Search Publications
The VLT-FLAMES Tarantula Survey. XI. A census of the hot luminous stars and their feedback in 30 Doradus
van Loon, J. Th.; Crowther, P. A.; Herrero, A. +16 more
Context. The VLT-FLAMES Tarantula Survey has an extensive view of the copious number of massive stars in the 30 Doradus (30 Dor) star forming region of the Large Magellanic Cloud. These stars play a crucial role in our understanding of the stellar feedback in more distant, unresolved star forming regions.
Aims: The first comprehensive census …
The Earliest Phases of Star Formation (EPoS): a Herschel key project. The thermal structure of low-mass molecular cloud cores
Stecklum, B.; Henning, Th.; Krause, O. +19 more
Context. The temperature and density structure of molecular cloud cores are the most important physical quantities that determine the course of the protostellar collapse and the properties of the stars they form. Nevertheless, density profiles often rely either on the simplifying assumption of isothermality or on observationally poorly constrained…
Resolving stellar populations with crowded field 3D spectroscopy
Roth, M. M.; Kamann, S.; Wisotzki, L.
We describe a new method of extracting the spectra of stars from observations of crowded stellar fields with integral field spectroscopy (IFS). Our approach extends the well-established concept of crowded field photometry in images into the domain of 3-dimensional spectroscopic datacubes. The main features of our algorithm follow. (1) We assume th…
Multiwavelength campaign on Mrk 509. XII. Broad band spectral analysis
Kaastra, J. S.; Kriss, G. A.; Bianchi, S. +12 more
The origin of the different spectral components present in the high-energy (UV to X-rays/gamma-rays) spectra of Seyfert galaxies is still being debated a lot. One of the major limitations, in this respect, is the lack of really simultaneous broad-band observations that allow us to disentangle the behavior of each component and to better constrain …
TNOs are Cool: A survey of the trans-Neptunian region. VIII. Combined Herschel PACS and SPIRE observations of nine bright targets at 70-500 µm
Mottola, S.; Fornasier, S.; Lellouch, E. +17 more
Aims: Trans-Neptunian objects (TNOs) are bodies populating the Kuiper belt and they are believed to retain the most pristine and least altered material of the solar system. The Herschel open time key programme entitled "TNOs are Cool: A survey of the trans-Neptunian region" has been awarded 373 h to investigate the albedo, size distribution a…
Atmospheric escape from HD 189733b observed in H I Lyman-α: detailed analysis of HST/STIS September 2011 observations
Ehrenreich, D.; Lecavelier des Etangs, A.; Bourrier, V. +8 more
Observations of transits of the hot giant exoplanet
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