Search Publications
XMM-Newton observations of the low-mass X-ray binary EXO 0748-676 in quiescence
Díaz Trigo, M.; Boirin, L.; Costantini, E. +2 more
The neutron star low-mass X-ray binary EXO 0748-676 started a transition from outburst to quiescence in August 2008, after more than 24 years of continuous accretion. The return of the source to quiescence has been monitored extensively by several X-ray observatories. Here, we report on four XMM-Newton observations elapsing a period of more than 1…
Discovery of the source HESS J1356-645 associated with the young and energetic PSR J1357-6429
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +195 more
Context. Several newly discovered very-high-energy (VHE; E > 100 GeV) γ-ray sources in the Galaxy are thought to be associated with energetic pulsars. Among them, middle-aged (≳ 104 yr) systems exhibit large centre-filled VHE nebulae, offset from the pulsar position, which result from the complex relationship between the pulsar wind …
Molecular Gas in NUclei of GAlaxies (NUGA). XIV. The barred LINER/Seyfert 2 galaxy NGC 3627
Hunt, L. K.; Combes, F.; García-Burillo, S. +2 more
We present 12CO(1-0) and 12CO(2-1) maps of the interacting barred LINER/Seyfert 2 galaxy NGC 3627 obtained with the IRAM interferometer at resolutions of 2.1 arcsec × 1.3 arcsec and 0.9 arcsec × 0.6 arcsec, respectively. We also present single-dish IRAM 30 m 12CO(1-0) and 12CO(2-1) observations used to c…
The quiet Sun average Doppler shift of coronal lines up to 2 MK
Solanki, S. K.; Teriaca, L.; Dadashi, N.
Context. The average Doppler shift shown by spectral lines formed from the chromosphere to the corona reveals important information on the mass and energy balance of the solar atmosphere, providing an important observational constraint to any models of the solar corona. Previous spectroscopic observations of vacuum ultra-violet (VUV) lines have re…
Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17511-3057
Stella, L.; Bozzo, E.; Kuiper, L. +6 more
Context. IGR J17511-3057 is the second X-ray transient accreting millisecond pulsar discovered by INTEGRAL. It was in outburst for about a month beginning on September 13, 2009.
Aims: We analyze the spectral and timing properties of the object and the characteristics of X-ray bursts with the aim to constrain the physical processes responsible…
Horizontal flow fields observed in Hinode G-band images. I. Methods
Verma, M.; Denker, C.
Context. The interaction of plasma motions and magnetic fields is an important mechanism, which drives the solar activity in all its facets. For example, photospheric flows are responsible for the advection of magnetic flux, the redistribution of flux during the decay of sunspots, and the build-up of magnetic shear in flaring active regions.
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HIFI detection of hydrogen fluoride in the carbon star envelope IRC +10216
Waters, L. B. F. M.; Teyssier, D.; Cernicharo, J. +5 more
We report the detection of emission in the J = 1-0 rotational transition of hydrogen fluoride (HF), together with observations of the J = 1-0 to J = 3-2 rotational lines of H35Cl and H37Cl, towards the envelope of the carbon star IRC +10216. High-sensitivity, high-spectral resolution observations have been carried out with th…
The X-ray puzzle of the L1551 IRS 5 jet
Schmitt, J. H. M. M.; Günther, H. M.; Schneider, P. C.
Protostars are actively accreting matter and they drive spectacular, dynamic outflows, which evolve on timescales of years. X-ray emission from these jets has been detected only in a few cases and little is known about its time evolution. We present a new Chandra observation of L1551 IRS 5's jet in the context of all available X-ray data of this o…
High-energy radiation from the massive binary system Eta Carinae
Bednarek, W.; Pabich, J.
Context. The most massive binary system Eta Carinae has been recently established as a gamma-ray source by the AGILE and Fermi-LAT detectors. The high energy spectrum of this gamma-ray source is very intriguing. It shows two clear components and a lack of any evidence of variability with the orbital period of the binary system.
Aims: We consi…
Interpretation of HINODE SOT/SP asymmetric Stokes profiles observed in the quiet Sun network and internetwork
Sánchez Almeida, J.; Berrilli, F.; Del Moro, D. +1 more
Stokes profiles emerging from the magnetized solar photosphere and observed by SOT/SP aboard the HINODE satellite exhibit a variety of complex shapes. These are indicative of unresolved magnetic structures that have been overlooked in the inversion analyses performed so far. Here we present the first interpretation of the Stokes profile asymmetrie…