Search Publications
Mass assembly in quiescent and star-forming galaxies since z ≃ 4 from UltraVISTA
Aussel, H.; Le Floc'h, E.; Sanders, D. B. +33 more
We estimate the galaxy stellar mass function and stellar mass density for star-forming and quiescent galaxies with 0.2 < z < 4. We construct a large, deep (Ks < 24) sample of 220 000 galaxies selected using the new UltraVISTA DR1 data release. Our analysis is based on precise 30-band photometricredshifts. By comparing these pho…
The VLT-FLAMES Tarantula Survey. VIII. Multiplicity properties of the O-type star population
Crowther, P. A.; Lennon, D. J.; Herrero, A. +14 more
Context. The Tarantula Nebula in the Large Magellanic Cloud is our closest view of a starburst region and is the ideal environment to investigate important questions regarding the formation, evolution and final fate of the most massive stars.
Aims: We analyze the multiplicity properties of the massive O-type star population observed through m…
Spectrophotometric time series of SN 2011fe from the Nearby Supernova Factory
Aldering, G.; Fakhouri, H. K.; Kowalski, M. +36 more
We present 32 epochs of optical (3300-9700 Å) spectrophotometric observations of the nearby quintessential "normal" type Ia supernova (SN Ia) SN 2011fe in the galaxy M101, extending from -15 to +97 d with respect to B-band maximum, obtained by the Nearby Supernova Factory collaboration. SN 2011fe is the closest (µ = 29.04) and brightest (B
Spectroscopic analysis of DA white dwarfs with 3D model atmospheres
Steffen, M.; Ludwig, H. -G.; Tremblay, P. -E. +1 more
We present the first grid of mean three-dimensional (3D) spectra for pure-hydrogen (DA) white dwarfs based on 3D model atmospheres. We use CO5BOLD radiation-hydrodynamics 3D simulations instead of the mixing-length theory for the treatment of convection. The simulations cover the effective temperature range of 6000 < Teff …
ALMA observations of feeding and feedback in nearby Seyfert galaxies: an AGN-driven outflow in NGC 1433
Tacconi, L. J.; Krips, M.; Schinnerer, E. +9 more
We report ALMA observations of CO(3-2) emission in the Seyfert 2 galaxy NGC 1433 at the unprecedented spatial resolution of 0.''5 = 24 pc. Our aim is to probe active galactic nucleus (AGN) feeding and feedback phenomena through the morphology and dynamics of the gas inside the central kpc. The galaxy NGC 1433 is a strongly barred spiral with three…
Panchromatic spectral energy distributions of Herschel sources
Berta, S.; Magnelli, B.; Nordon, R. +24 more
Combining far-infrared Herschel photometry from the PACS Evolutionary Probe (PEP) and Herschel Multi-tiered Extragalactic Survey (HerMES) guaranteed time programs with ancillary datasets in the GOODS-N, GOODS-S, and COSMOS fields, it is possible to sample the 8-500 µm spectral energy distributions (SEDs) of galaxies with at least 7-10 bands.…
3D model of hydrogen atmospheric escape from HD 209458b and HD 189733b: radiative blow-out and stellar wind interactions
Lecavelier des Etangs, A.; Bourrier, V.
Transit observations in the Lyman-α line of the hot-Jupiters HD 209458b and HD 189733b revealed strong signatures of neutral hydrogen escaping the planets' upper atmospheres. Here we present a 3D particle model of the dynamics of the escaping atoms. This model is used to calculate theoretical Lyman-α absorption line profiles, which can be directly…
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 …
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