Search Publications
Spatially resolved dusty torus toward the red supergiant WOH G64 in the Large Magellanic Cloud
Weigelt, G.; Hofmann, K. -H.; Driebe, T. +2 more
Aims: We present N-band spectro-interferometric observations of the red supergiant
Astrometric and photometric monitoring of GQ Lupi and its sub-stellar companion
Neuhäuser, R.; Schmidt, T. O. B.; Mugrauer, M. +2 more
Context: Neuhäuser et al. (2005, A&A, 435, L13) presented direct imaging evidence for a sub-stellar companion to the young T Tauri star GQ Lupi. Common proper motion was highly significant, but no orbital motion was detected. Faint luminosity, low gravity, and a late-M/early-L spectral type indicated that the companion is either a planet or a …
Dust processing in photodissociation regions. Mid-IR emission modelling
Abergel, A.; Habart, E.; Compiègne, M. +1 more
Context: Mid-infrared spectroscopy of dense illuminated ridges (or photodissociation regions, PDRs) suggests dust evolution. Such evolution must be reflected in the gas physical properties through processes like photo-electric heating or H2 formation.
Aims: With Spitzer Infrared Spectrograph (IRS) and ISOCAM data, we study the mid-IR emission …
The relationship between EUV dimming and coronal mass ejections. I. Statistical study and probability model
Harrison, R. A.; Brown, D. S.; Bewsher, D.
Aims:There have been many studies of extreme-ultraviolet (EUV) dimming in association with coronal mass ejection (CME) onsets. However, there has never been a thorough statistical study of this association, covering appropriate temperature ranges. Thus, we make use of a large campaign database utilising the Coronal Diagnostic Spectrometer (CDS) an…
Global characteristics of GRBs observed with INTEGRAL and the inferred large population of low-luminosity GRBs
McGlynn, S.; McBreen, S.; Foley, S. +2 more
Context: INTEGRAL has two sensitive gamma-ray instruments that have detected and localised 47 gamma-ray bursts (GRBs) from its launch in October 2002 up to July 2007.
Aims: We present the spectral, spatial, and temporal properties of the bursts in the INTEGRAL GRB catalogue using data from the imager, IBIS, and spectrometer, SPI.
Methods: …
A Hubble Space Telescope transit light curve for GJ 436b
Reiners, A.; Dreizler, S.; Benedict, G. F. +6 more
We present time series photometry for six partial transits of GJ 436b obtained with the Fine Guidance Sensor instrument on the Hubble Space Telescope (HST). Our analysis of these data yields independent estimates of the host star's radius Rstar = 0.505+0.029-0.020 R⊙, and the planet's orbital period P = …
Cumulative hard X-ray spectrum of local AGN: a link to the cosmic X-ray background
Sunyaev, R.; Krivonos, R.; Revnivtsev, M. +2 more
Aims: We determine the cumulative spectral energy distribution (SED) of local active galactic nuclei (AGN) in the 3-300 keV band and compare it with the spectrum of the cosmic X-ray background (CXB) in order to test the widely accepted paradigm that the CXB is a superposition of AGN and to place constraints on AGN evolution.
Methods: We perfor…
Star formation efficiency in galaxy clusters
Andrade-Santos, F.; Cypriano, E. S.; Laganá, T. F. +1 more
Context: The luminous material in clusters of galaxies exists in two forms: the visible galaxies and the X-ray emitting intra-cluster medium. The hot intra-cluster gas is the major observed baryonic component of clusters, about six times more massive than the stellar component. The mass contained within visible galaxies is approximately 3% of the …
Line ratios from shocked cloudlets in planetary nebulae
Velázquez, P. F.; Raga, A. C.; Esquivel, A. +2 more
Context: Some PNe and PPNe show compact knots, travelling at high velocities away from the central sources.
Aims: We compute a number of models from which we obtain predictions of the emission-line spectrum, which can be compared with the spectra of the observed knots.
Methods: We completed a series of 11 axisymmetric simulations of an ini…
The XMM-Newton bright serendipitous survey. Identification and optical spectral properties
Sbarufatti, B.; Pietsch, W.; Page, M. J. +12 more
Aims:We present the optical classification and redshift of 348 X-ray selected sources from the XMM-Newton Bright Serendipitous Survey (XBS), which contains a total of 400 objects (identification level = 87%). About 240 are new identifications. In particular, we discuss in detail the classification criteria adopted for the active galactic nuclei (A…