Search Publications
SXP 1062, a young Be X-ray binary pulsar with long spin period. Implications for the neutron star birth spin
Pietsch, W.; Haberl, F.; Filipović, M. D. +2 more
Context. The Small Magellanic Cloud (SMC) is ideally suited to investigating the recent star formation history from X-ray source population studies. It harbours a large number of Be/X-ray binaries (Be stars with an accreting neutron star as companion), and the supernova remnants can be easily resolved with imaging X-ray instruments.
Aims: We …
A four-year XMM-Newton/Chandra monitoring campaign of the Galactic centre: analysing the X-ray transients
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +5 more
We report on the results of a four-year long X-ray monitoring campaign of the central 1.2 square degrees of our Galaxy, performed with Chandra and XMM-Newton between 2005 and 2008. Our study focuses on the properties of transient X-ray sources that reach 2-10 keV luminosities of LX ≳ 1034 erg s-1 for an assumed dis…
Modelling the dust emission from dense interstellar clouds: disentangling the effects of radiative transfer and dust properties
Abergel, A.; Bernard, J. -P.; Juvela, M. +9 more
Context. Dust emission is increasingly used as a tracer of the mass in the interstellar medium. With the combination of Planck and Herschel observatories, we now have both the spectral coverage and the angular resolution required to observe dense and cold molecular clouds. However, as these clouds are optically thick at short wavelengths but optic…
The Herschel view of the on-going star formation in the Vela-C molecular cloud
Hill, T.; White, G. J.; Rygl, K. L. J. +24 more
Aims: As part of the Herschel guaranteed time key programme "HOBYS", we present the PACS and SPIRE photometric survey of the star-forming region Vela-C, one of the nearest sites of low-to-high-mass star formation in the Galactic plane. Our main objectives are to take a census of the cold sources and to derive their mass distribution down to a…
Multi-color observations of short GRB afterglows: 20 events observed between 2007 and 2010
Greiner, J.; McBreen, S.; Hartmann, D. H. +18 more
We report on follow-up observations of 20 short-duration gamma-ray bursts (GRBs; T90 < 2 s) performed in g'r'i'z'JHKs with the Gamma-Ray Burst Optical Near-Infrared Detector (GROND) between mid-2007 and the end of 2010. This is one of the most comprehensive data sets on GRB afterglow observations of short bursts published …
The flow of interstellar dust into the solar system
Kempf, S.; Srama, R.; Grün, E. +3 more
Context. Interstellar dust (ISD) is a major component in the formation and evolution of stars, stellar systems, and planets. Astronomical observations of interstellar extinction and polarization, and of the infrared emission of the dust, are the most commonly used technique for characterizing interstellar dust. Besides this, the interstellar dust …
Coronal activity cycles in nearby G and K stars. XMM-Newton monitoring of 61 Cygni and α Centauri
Schmitt, J. H. M. M.; Robrade, J.; Favata, F.
Context. While we have ample evidence of stellar analogues to the solar activity cycle for chromospheric activity, very little is known about stellar coronal cycles and their possible similarities to the solar behavior.
Aims: An ongoing X-ray monitoring program of solar-like stars with XMM-Newton is performed to investigate coronal activity c…
An optical/NIR survey of globular clusters in early-type galaxies. III. On the colour bimodality of globular cluster systems
Larsen, S. S.; Kuntschner, H.; Cantiello, M. +4 more
Context. The interpretation that bimodal colour distributions of globular clusters (GCs) reflect bimodal metallicity distributions has been challenged. Non-linearities in the colour to metallicity conversions caused for example by the horizontal branch (HB) stars may be responsible for transforming a unimodal metallicity distribution into a bimoda…
Evolution of the observed Lyα luminosity function from z = 6.5 to z = 7.7: evidence for the epoch of reionization?
Kneib, J. -P.; Lidman, C.; Willis, J. +17 more
Aims: Lyα emitters (LAEs) can be detected out to very high redshifts during the epoch of reionization. The evolution of the LAE luminosity function with redshift is a direct probe of the Lyα transmission of the intergalactic medium (IGM), and therefore of the IGM neutral-hydrogen fraction. Measuring the Lyα luminosity function (LF) of Lyα emi…
Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project
de Bruijne, J. H. J.; Eilers, A. -C.
Context. The Hundred-Thousand-Proper-Motion (HTPM) project will determine the proper motions of ~113 500 stars using a ~23-year baseline. The proper motions will be based on space-based measurements exclusively, with the Hipparcos data, with epoch 1991.25, as first epoch and with the first intermediate-release Gaia astrometry, with epoch ~2014.5, …