Search Publications
Multiwavelength campaign on Mrk 509. VI. HST/COS observations of the far-ultraviolet spectrum
Kaastra, J. S.; Kriss, G. A.; Arav, N. +15 more
We present medium-resolution (λ/Δλ ~ 20 000) ultraviolet spectra covering the 1155-1760 Å spectral range of the Seyfert 1 galaxy
Phase-resolved spectroscopic study of the isolated neutron star RBS 1223 (1RXS J130848.6+212708)
Werner, K.; Neuhäuser, R.; Schwope, A. D. +3 more
Aims: We constrain the mass-to-radius ratio of isolated neutron stars by performing a spin-phase resolved X-ray spectroscopic analysis.
Methods: We combined the data from all observations of RBS 1223 (1RXS J130848.6+212708) conducted by XMM-Newton EPIC pn with the same instrumental setup in 2003-2007 to form spin-phase resolved spectra. …
A Herschel resolved far-infrared dust ring around HD 207129
Fridlund, M.; Krivov, A. V.; Eiroa, C. +26 more
Context. Dusty debris discs around main sequence stars are thought to be the result of continuous collisional grinding of planetesimals in the system. The majority of these systems are unresolved and analysis of the dust properties is limited by the lack of information regarding the dust location.
Aims: The Herschel DUNES key program is obser…
Transiting exoplanets from the CoRoT space mission. XVIII. CoRoT-18b: a massive hot Jupiter on a prograde, nearly aligned orbit
Mazeh, T.; Aigrain, S.; Alonso, R. +44 more
We report the detection of CoRoT-18b, a massive hot Jupiter transiting in front of its host star with a period of 1.9000693 ± 0.0000028 days. This planet was discovered thanks to photometric data secured with the CoRoT satellite combined with spectroscopic and photometric ground-based follow-up observations. The planet has a mass Mp = 3…
Validated helioseismic inversions for 3D vector flows
Hanasoge, S. M.; Gizon, L.; Švanda, M. +1 more
Context. According to time-distance helioseismology, information about internal fluid motions is encoded in the travel times of solar waves. The inverse problem consists of inferring three-dimensional vector flows from a set of travel-time measurements. While only few tests of the inversions have been done, it is known that the retrieval of the sm…
Continuous upflows and sporadic downflows observed in active regions
Peter, H.; Solanki, S. K.; Curdt, W. +1 more
Aims: We present a study of the temporal evolution of coronal loops in active regions and its implications for the dynamics in coronal loops.
Methods: We analyzed images of the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO) at multiple temperatures to detect apparent motions in the coronal loops.
Results:…
Turbulent and fast motions of H2 gas in active galactic nuclei
Combes, F.; Dasyra, K. M.
Querying the Spitzer archive for optically-selected active galactic nuclei (AGN) observed in high-resolution-mode spectroscopy, we identified radio and/or interacting galaxies with highly turbulent motions of H2 gas at a temperature of a few hundred Kelvin. Unlike all other AGN that have unresolved H2 line profiles at a spect…
Spectroscopic evidence for helicity in explosive events
Curdt, W.; Tian, H.
Aims: We report spectroscopic observations in support of a novel view of transition region explosive events, observations that lend empirical evidence that at least in some cases explosive events may be nothing else but spinning narrow spicule-like structures.
Methods: Our spectra of textbook explosive events with simultaneous Doppler fl…
GOODS-Herschel: a population of 24 µm dropout sources at z < 2
Magnelli, B.; Lutz, D.; Altieri, B. +25 more
Using extremely deep PACS 100- and 160 µm Herschel data from the GOODS-Herschel program, we identify 21 infrared bright galaxies previously missed in the deepest 24 µm surveys performed by Spitzer/MIPS. These MIPS dropouts are predominantly found in two redshift bins, centred at z ~ 0.4 and ~1.3. Their S100/S24 fl…
Wide-field VLBA observations of the Chandra deep field South
Deller, A.; Lenc, E.; Morgan, J. +7 more
Context. Wide-field surveys are a commonly-used method for studying thousands of objects simultaneously, to investigate, e.g., the joint evolution of star-forming galaxies and active galactic nuclei. Very long baseline interferometry (VLBI) observations can yield valuable input for such studies because they are able to identify AGN unambiguously i…