Search Publications
A study of the distant activity of comet C/2006 W3 (Christensen) with Herschel and ground-based radio telescopes
Blommaert, J. A. D. L.; Lara, L. M.; Küppers, M. +35 more
Comet C/2006 W3 (Christensen) was observed in November 2009 at 3.3 AU from the Sun with Herschel.The PACS instrument acquired images of the dust coma in 70-µm and 160-µm filters and spectra covering several H2O rotational lines. Spectra in the range 450-1550 GHz were acquired with SPIRE. The comet emission continuum from 70 …
Variability and spectral energy distributions of low-luminosity active galactic nuclei: a simultaneous X-ray/UV look with Swift
Pian, E.; Cucchiara, A.; Pagani, C. +3 more
We have observed four low-luminosity active galactic nuclei (AGNs) classified as type 1 Low-Ionization Nuclear Emission-Line Regions (LINERs) with the X-Ray Telescope (XRT) and the Ultraviolet-Optical Telescope (UVOT) onboard Swift, in an attempt to clarify the main powering mechanism of this class of nearby sources. Among our targets, we detect X…
Upper limits for undetected trace species in the stratosphere of Titan
Bézard, Bruno; Vinatier, Sandrine; Nixon, Conor A. +15 more
In this paper we describe a first quantitative search for several molecules in Titan's stratosphere in Cassini CIRS infrared spectra. These are: ammonia (NH3), methanol (CH3OH), formaldehyde (H2CO), and acetonitrile (CH3CN), all of which are predicted by photochemical models but only the last of which observed, and not in the infrared. We find non…
Benchmarking atomic data for astrophysics: Fe xi
Del Zanna, G.
High-resolution spectroscopic observations of the solar corona and laboratory measurements are used to review all the line identifications for Fe xi, from the EUV to the visible. The results of the atomic structure and scattering calculations are presented elsewhere, while detailed comparisons between observed and predicted wavelengths and intensi…
Long period oscillations in sunspots
Bakunina, I. A.; Nakariakov, V. M.; Hnat, B. +2 more
Long period oscillations of the gyroresonant emission from sunspot atmospheres are studied. Time series data generated from the sequences of images obtained by the Nobeyama Radioheliograph operating at a frequency of 17 GHz for three sunspots have been analysed and are found to contain significant periods in the range of several tens of minutes. W…
Modeling UV and X-ray Emission in a Post-coronal Mass Ejection Current Sheet
Vršnak, Bojan; Raymond, John C.; Ko, Yuan-Kuen +1 more
A post-coronal mass ejection (CME) current sheet (CS) is a common feature developed behind an erupting flux rope in CME models. Observationally, white light observations have recorded many occurrences of a thin ray appearing behind a CME eruption that closely resembles a post-CME CS in its spatial correspondence and morphology. UV and X-ray observ…
A cometary origin for CO in the stratosphere of Saturn?
Hartogh, P.; Lellouch, E.; Encrenaz, T. +6 more
Context. The CO(3-2) line has been observed in the atmosphere of Saturn. The CO(3-2) observation proves that an external source of CO exists in the stratosphere of the planet.
Aims: We attempt to constrain the type and magnitude of the external source of CO in the atmosphere of Saturn, by observing the emission core of the CO(6-5) line.
…
The ALHAMBRA Photometric System
Cepa, J.; Infante, L.; Castander, F. J. +20 more
This paper presents the characterization of the optical range of the ALHAMBRA photometric system, a 20 contiguous, equal-width, medium-band CCD system with wavelength coverage from 3500 Å to 9700 Å. The photometric description of the system is done by presenting the full response curve as a product of the filters, CCD, and atmospheric transmission…
Detection of OH+ and H2O+ towards Orion KL
Menten, K. M.; Falgarone, E.; Martin, P. G. +76 more
We report observations of the reactive molecular ions OH+, H2O+, and H3O+ towards Orion KL with Herschel/HIFI. All three N = 1-0 fine-structure transitions of OH+ at 909, 971, and 1033 GHz and both fine-structure components of the doublet ortho-H2O+ 111
Dust in the bright supernova remnant N49 in the LMC
van Loon, J. Th.; Reach, W. T.; Okumura, K. +14 more
We investigate the dust associated with the supernova remnant (SNR) N49 in the Large Magellanic Cloud (LMC) as observed with the Herschel Space Observatory. N49 is unusually bright because of an interaction with a molecular cloud along its eastern edge. We have used PACS and SPIRE to measure the far IR flux densities of the entire SNR and of a bri…