Search Publications
Analyzing low signal-to-noise FUSE spectra. Confirmation of Lyman continuum escape from Haro 11
Piskunov, N.; Leitet, E.; Bergvall, N. +1 more
Context. Galaxies are believed to be the main providers of Lyman continuum (LyC) photons during the early phases of the cosmic reionization. Little is known however, when it comes to escape fractions and the mechanisms behind the leakage. To learn more, one may look at local objects, but so far only one low-z galaxy has shown any signs of emitting…
Sub-arcsecond [Fe ii] spectro-imaging of the DG Tauri jet. Periodic bubbles and a dusty disk wind?
Dougados, C.; Cabrit, S.; Agra-Amboage, V. +1 more
Context. The origin of protostellar jets as well as their impact on the regulation of angular momentum and the inner disk physics are still crucial open questions in star formation.
Aims: We aim to test the different proposed ejection processes in T Tauri stars through high-angular resolution observations of forbidden-line emission from the i…
The X-ray luminous galaxy cluster XMMU J1007.4+1237 at z = 1.56. The dawn of starburst activity in cluster cores
Böhringer, H.; Pratt, G. W.; Rosati, P. +12 more
Context. Observational galaxy cluster studies at z > 1.5 probe the formation of the first massive M > 1014 M⊙ dark matter halos, the early thermal history of the hot ICM, and the emergence of the red-sequence population of quenched early-type galaxies.
Aims: We present first results for the newly discovered X-ray l…
The outburst and nature of two young eruptive stars in the North America/Pelican Nebula Complex
Pál, A.; Ábrahám, P.; Kóspál, Á. +8 more
Context. The sudden optical brightening of two young stellar objects, HBC 722 and VSX J205126.1+440523, located in the North America/Pelican Nebula Complex, was announced in August 2010. Early photometric and spectroscopic observations of these objects indicated that they may belong to the FUor or EXor class of young eruptive stars. The eruptions …
Planck early results. V. The Low Frequency Instrument data processing
Baccigalupi, C.; Banday, A. J.; Barreiro, R. B. +146 more
We describe the processing of data from the Low Frequency Instrument (LFI) used in production of the Planck Early Release Compact Source Catalogue (ERCSC). In particular, we discuss the steps involved in reducing the data from telemetry packets to cleaned, calibrated, time-ordered data (TOD) and frequency maps. Data are continuously calibrated usi…
Black hole accretion and host galaxies of obscured quasars in XMM-COSMOS
Kneib, J. -P.; Aussel, H.; Le Floc'h, E. +61 more
Aims: We explore the connection between black hole growth at the center of obscured quasars selected from the XMM-COSMOS survey and the physical properties of their host galaxies. We study a bolometric regime ( ⟨ Lbol ⟩ = 8 × 1045 erg s-1) where several theoretical models invoke major galaxy mergers as the mai…
GOODS-Herschel: evidence of a UV extinction bump in galaxies at z > 1
Magnelli, B.; Altieri, B.; Aussel, H. +16 more
Context. Dust attenuation curves in external galaxies are useful for studying their dust properties as well as interpreting their intrinsic spectral energy distributions. These functions are not very well known in the UV range whether at low or high redshift. In particular, the presence or absence of a UV bump at 2175 Å remains an open issue that …
An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry
Auvergne, M.; Baudin, F.; Michel, E. +13 more
The O9V star HD 46202, which is a member of the young open cluster NGC 2244, was observed by the CoRoT satellite in October/November 2008 during a short run of 34 days. From the very high-precision light curve, we clearly detect β Cep-like pulsation frequencies with amplitudes of ~0.1 mmag and below. A comparison with stellar models was performed …
The deep XMM-Newton Survey of M 31
Stiele, H.; Pietsch, W.; Haberl, F. +5 more
Aims: The largest Local Group spiral galaxy,
Multi-wavelength observations of Proxima Centauri
Liefke, C.; Schmitt, J. H. M. M.; Reiners, A. +5 more
Aims: We report simultaneous observations of the nearby flare star Proxima Centauri with VLT/UVES and XMM-Newton over three nights in March 2009. Our optical and X-ray observations cover the star's quiescent state, as well as its flaring activity and allow us to probe the stellar atmospheric conditions from the photosphere into the chromosphe…