Search Publications
NGC 6240 : extended CO structures and their association with shocked gas
Aussel, H.; Elbaz, D.; Le Floc'h, E. +7 more
We present deep CO(1-0) observations of
Accuracy of magnetic energy computations
Démoulin, P.; Masson, S.; Pariat, E. +1 more
Context. For magnetically driven events, the magnetic energy of the system is the prime energy reservoir that fuels the dynamical evolution. In the solar context, the free energy (i.e., the energy in excess of the potential field energy) is one of the main indicators used in space weather forecasts to predict the eruptivity of active regions. A tr…
Large scale IRAM 30 m CO-observations in the giant molecular cloud complex W43
Hill, T.; Schneider, N.; Ossenkopf, V. +11 more
We aim to fully describe the distribution and location of dense molecular clouds in the giant molecular cloud complex W43. It was previously identified as one of the most massive star-forming regions in our Galaxy. To trace the moderately dense molecular clouds in the W43 region, we initiated W43-HERO, a large program using the IRAM 30 m telescope…
Obscuration effects in super-soft-source X-ray spectra
Behar, E.; Ness, J. -U.; Henze, M. +11 more
Context. Super-soft-source (SSS) X-ray spectra are blackbody-like spectra with effective temperatures ~3-7 × 105 K and luminosities of 1035-38 erg s-1. Grating spectra of SSS and novae in outburst that show SSS type spectra display atmospheric absorption lines. Radiation transport atmosphere models can be used to d…
The evolution of H I and C IV quasar absorption line systems at 1.9 < z < 3.2
Carswell, R. F.; Kim, T. -S.; Partl, A. M. +1 more
We have investigated the distribution and evolution of ~3100 intergalactic neutral hydrogen (H i) absorbers with H I column densities log NH I = [12.75,17.0] at 1.9 < z < 3.2, using 18 high resolution, high signal-to-noise quasar spectra obtained from the ESO VLT/UVES archive. We used two sets of Voigt profile fitting analysis, on…
High-rigidity Forbush decreases: due to CMEs or shocks?
Antia, H. M.; Subramanian, P.; Hayashi, Y. +7 more
Aims: We seek to identify the primary agents causing Forbush decreases (FDs) in high-rigidity cosmic rays observed from the Earth. In particular, we ask if these FDs are caused mainly by coronal mass ejections (CMEs) from the Sun that are directed towards the Earth, or by their associated shocks.
Methods: We used the muon data at cutoff …
Integrated spectroscopy of the Herschel Reference Survey. The spectral line properties of a volume-limited, K-band-selected sample of nearby galaxies
Buat, V.; Boselli, A.; Cortese, L. +2 more
We present long-slit integrated spectroscopy of 238 late-type galaxies belonging to the Herschel Reference Survey, a volume-limited sample representative of the nearby universe. This sample has a unique legacy value since it was ideally defined for any statistical study of the multifrequency properties of galaxies spanning a wide range in morpholo…
Uncertainties in water chemistry in disks: An application to TW Hydrae
Pinte, C.; Dent, W. R. F.; Woitke, P. +7 more
Context. This paper discusses the sensitivity of water lines to chemical processes and radiative transfer for the protoplanetary disk around TW Hya. The study focuses on the Herschel spectral range in the context of new line detections with the PACS instrument from the Gas in Protoplanetary Systems project (GASPS).
Aims: The paper presents an…
Testing reflection features in 4U 1705-44 with XMM-Newton, BeppoSAX, and RXTE in the hard and soft states
Santangelo, A.; Belloni, T.; Robba, N. R. +10 more
We use data from the bright atoll source 4U 1705-44 taken with XMM-Newton, BeppoSAX, and RXTE both in the hard and in the soft state to perform a self-consistent study of the reflection component in this source. Although the data from these X-ray observatories are not simultaneous, the spectral decomposition is shown to be consistent among the dif…
A solar tornado triggered by flares?
Innes, D. E.; Low, B. C.; Tiwari, S. K. +1 more
Context. Solar tornados are dynamical, conspicuously helical magnetic structures that are mainly observed as a prominence activity.
Aims: We investigate and propose a triggering mechanism for the solar tornado observed in a prominence cavity by SDO/AIA on September 25, 2011.
Methods: High-cadence EUV images from the SDO/AIA and the Ahead…