Search Publications
Herschel CHESS discovery of the fossil cloud that gave birth to the Trapezium and Orion KL
Ceccarelli, C.; Dominik, C.; Caux, E. +4 more
Context. The Orion A molecular complex is a nearby (420 pc), very well studied stellar nursery that is believed to contain examples of triggered star formation.
Aims: As part of the Herschel guaranteed time key programme CHESS, we present the discovery of a diffuse gas component in the foreground of the intermediate-mass protostar OMC-2 FIR 4…
The dust SED of dwarf galaxies. I. The case of NGC 4214
Groves, B.; Relaño, M.; Lisenfeld, U. +3 more
Context. High-resolution data from Spitzer, Herschel, and Planck allow us to probe the entire spectral energy distribution (SED) of morphologically separated components of the dust emission from nearby galaxies and allow a more detailed comparison between data and models.
Aims: We wish to establish the physical origin of dust heating and emis…
On the relation between continuum brightness and magnetic field in solar active regions
Danilovic, S.; Schüssler, M.; Cameron, R. H. +1 more
Context. Variations of solar irradiance are mainly determined by the changing coverage of the visible solar disk with magnetic flux concentrations. The relationship between brightness and field strength is an important ingredient for models and reconstructions of irradiance variations.
Aims: We assess the effect of limited observational resol…
Long-term multiwavelength studies of high-redshift blazar 0836+710
Akyuz, A.; Thompson, D. J.; Zensus, J. A. +7 more
Aims: The observation of γ-ray flares from blazar 0836+710 in 2011, following a period of quiescence, offered an opportunity to study correlated activity at different wavelengths for a high-redshift (z = 2.218) active galactic nucleus.
Methods: Optical and radio monitoring, plus Fermi-LAT γ-ray monitoring provided 2008-2012 coverage, whi…
The XMM deep survey in the CDF-S. VI. Obscured AGN selected as infrared power-law galaxies
Vignali, C.; Ranalli, P.; Comastri, A. +7 more
Context. Accretion onto supermassive black holes is believed to occur mostly in obscured active galactic nuclei (AGN). Such objects are proving rather elusive in surveys of distant galaxies, including those at X-ray energies.
Aims: Our main goal is to determine whether the revised IRAC criteria of Donley et al. (2012, ApJ, 748, 142; objects w…
The effect of advection at luminosities close to Eddington: The ULX in M 31
Done, C.; Middleton, M.; Straub, O.
The transient, ultra-luminous X-ray source CXOM31 J004253.1+411422 in the Andromeda galaxy is most likely a 10 solar mass black hole, with super-Eddington luminosity at its peak. The XMM-Newton spectra taken during the decline then trace luminosities of 0.86-0.27 LEdd. These spectra are all dominated by a hot disc component, which rough…
Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769
Auvergne, M.; Baudin, F.; Poretti, E. +16 more
Aims: We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD 46769 (V = 5.79). We also attempt to detect a magnetic field in the target.
Methods: We analyse a 23-day oversampled CoRoT light curve after detrending and spectroscopic follow-up data using standard Fourier anal…
Catching the fish - Constraining stellar parameters for TX Piscium using spectro-interferometric observations
Verhoelst, T.; Marigo, P.; Hron, J. +4 more
Context. Stellar parameter determination is a challenging task when dealing with galactic giant stars. The combination of different investigation techniques has proven to be a promising approach.
Aims: We analyse archive spectra obtained with the Short Wavelength Spectrometer (SWS) onboard ISO, and new interferometric observations from the Ve…
Supersoft X-rays reveal a classical nova in the M 31 globular cluster Bol 126
Della Valle, M.; Pietsch, W.; Haberl, F. +17 more
Context. Classical novae (CNe) represent the main class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M 31. Only three confirmed novae and three SSSs have been discovered in globular clusters (GCs) of any galaxy so far, of which one nova and two SSSs (including the nova) were found in M 31 GCs.
Aims: To st…
Planck intermediate results. VI. The dynamical structure of PLCKG214.6+37.0, a Planck discovered triple system of galaxy clusters
Böhringer, H.; Kneissl, R.; Dahle, H. +206 more
The survey of galaxy clusters performed by Planck through the Sunyaev-Zeldovich effect has already discovered many interesting objects, thanks to its full sky coverage. One of the SZ candidates detected inthe early months of the mission near to the signal-to-noise threshold, PLCKG214.6+37.0, was later revealed by XMM-Newton to be a triple system o…