Search Publications
Tully-Fisher analysis of the multiple cluster system Abell 901/902
Gray, M. E.; Wolf, C.; Barden, M. +7 more
Context.
Aims: We derive rotation curves from optical emission lines of 182 disc galaxies (96 in the cluster and 86 in the field) in the region of Abell 901/902 located at z ~ 0.165. We continue the kinematic analysis presented in a previous paper. Here, we focus on the analysis of B-band and stellar-mass Tully-Fisher relations. We examine po…
The twofold debris disk around HD 113766 A. Warm and cold dust as seen with VLTI/MIDI and Herschel/PACS
Absil, O.; Augereau, J. -C.; Henning, Th. +5 more
Context. Warm debris disks are a sub-sample of the large population of debris disks, and display excess emission in the mid-infrared. Around solar-type stars, very few objects (~2% of all debris disks) show emission features in mid-IR spectroscopic observations that are attributed to small, warm silicate dust grains. The origin of this warm dust c…
Herschel imaging and spectroscopy of the nebula around the luminous blue variable star WRAY 15-751
Magain, P.; Nazé, Y.; Groenewegen, M. A. T. +5 more
We have obtained far-infrared Herschel-PACS imaging and spectroscopic observations of the nebular environment of the luminous blue variable (LBV) WRAY 15-751. The far-infrared images clearly show that the main, dusty nebula is a shell of radius 0.5 pc and width 0.35 pc extending outside the Hα nebula. Furthermore, these images reveal a second, big…
A portrait of the extreme solar system object 2012 DR30
Pál, A.; Lellouch, E.; Müller, T. G. +15 more
2012 DR30 is a recently discovered solar system object on a unique orbit, with a high eccentricity of 0.9867, a perihelion distance of 14.54 AU, and a semi-major axis of 1109 AU, in this respect outscoring the vast majority of trans-Neptunian objects (TNOs). We performed Herschel/PACS and optical photometry to uncover the sizeand albedo…
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…