Search Publications
Sparse point-source removal for full-sky CMB experiments: application to WMAP 9-year data
Starck, J. -L.; Bobin, J.; Rassat, A. +2 more
Missions such as WMAP or Planck measure full-sky fluctuations of the cosmic microwave background and foregrounds, among which bright compact source emissions cover a significant fraction of the sky. To accurately estimate the diffuse components, the point-source emissions need to be separated from the data, which requires a dedicated processing. W…
The H i hole and AGB stellar population of the Sagittarius dwarf irregular galaxy . HST proper-motion decontamination
Gullieuszik, M.; Momany, Y.; Clemens, M. +8 more
Using two HST/ACS data sets that are separated by about two years has allowed us to derive the relative proper motion for the Sagittarius dwarf irregular (SagDIG) and reduce the heavy foreground Galactic contamination. The proper-motion decontaminated SagDIG catalog provides a much clearer view of the young red-supergiant and intermediate-age asym…
INTEGRAL and Swift observations of the hard X-ray transient MAXI J1828-249
Ferrigno, C.; Bozzo, E.; Filippova, E.
In this paper we report on the observations performed with INTEGRAL and Swift of the first outburst detected from the hard X-ray transient MAXI J1828-249. During the first about two days of the outburst, the source was observed by MAXI to undergo a very rapid transition from a hard to a softer spectral state. While the hard state was not efficient…
X-ray and UV observations of V751 Cygni in an optical high state
Watson, M. G.; Osborne, J. P.; Page, K. L. +3 more
Aims: The VY Scl system (anti-dwarf nova) V751 Cyg is examined following a claim of a super-soft spectrum in the optical low state.
Methods: A serendipitous XMM-Newton X-ray observation and, 21 months later, Swift X-ray and UV observations, have provided the best such data on this source so far. These optical high-state datasets are used…
New near-infrared observations and lens-model constraints for UM673
Chen, W. P.; Koptelova, E.; Chiueh, T. +1 more
Aims: We performed a detailed photometric analysis of the lensed system
Methods: High-resolution adaptive optics images of
Observations of the early stages in the formation of an LBV shell
González, Ricardo F.; Koenigsberger, Gloria
Luminous blue variables are massive stars that undergo a series of eruptive events through which they shed their outer layers before becoming Wolf-Rayet stars. During the eruptive events, their winds are denser and expand slower than in the non-eruptive state. In this paper we apply a model for the interaction of the post-eruption fast wind with t…
A multiwavelength study of the hierarchical triple HD 181068. A test bed for studying star-planet interaction?
Schmitt, J. H. M. M.; Czesla, S.; Schneider, P. C. +1 more
HD 181068 is the only compact, triply eclipsing, hierarchical triple system containing a giant star that is known to date. With its central, highly active G-type giant orbited by a close pair of main-sequence dwarfs, the system is ideal for studying tidal interactions. We carried out a multiwavelength study to characterize the magnetic activity of…
On the possible correlation of Galactic very-high energy source locations and enhancements of the surface density in the Galactic plane
Torres, D. F.; de Oña Wilhelmi, E.; Pedaletti, G.
Aims: The association of very-high energy sources with regions of the sky rich in dust and gas has been noticed in the study of individual very-high energy (VHE; E ≳ 100 GeV) sources. However, the statistical significance of this correlation for the whole population of TeV detections has not been assessed yet. Here, we present a study of the …
The origin of organic emission in NGC 2071
Johnstone, D.; Fich, M.; McCoey, C. +2 more
Context. The physical origin behind organic emission lines in embedded low-mass star formation has been fiercely debated over the last two decades. A multitude of scenarios have been proposed, from a hot corino to PDRs on cavity walls to shock excitation.
Aims: The aim of this paper is to determine the location and the corresponding physical …
Numerical simulations of stellar jets and comparison between synthetic and observed maps: clues to the launch mechanism
Bacciotti, F.; Maurri, L.; Rubini, F. +2 more
High angular resolution spectra obtained with the Hubble Space Telescope Imaging Spectrograph (HST/STIS) provide rich morphological and kinematical information about the stellar jet phenomenon, which allows us to test theoretical models efficiently. In this work, numerical simulations of stellar jets in the propagation region are executed with the…