Search Publications
The ionized absorber and nuclear environment of IRAS 13349+2438: multi-wavelength insights from coordinated Chandra HETGS, HST STIS, HET and Spitzer IRS
Brandt, William N.; Hines, Dean C.; Reynolds, Christopher S. +6 more
We present results from a multi-wavelength infrared (IR)-to-X-ray campaign of the infrared bright (but highly optical-ultraviolet extincted) quasi-stellar object (QSO) IRAS 13349+2438 obtained with the Chandra High Energy Transmission Grating Spectrometer (HETGS), the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS), the Ho…
Discovery of a magnetic field in the CoRoT hybrid B-type pulsator HD 43317
Neiner, C.; Briquet, M.; Pápics, P. I. +2 more
Context. A promising way of testing the impact of a magnetic field on internal mixing (core overshooting, internal rotation) in main-sequence B-type stars is to perform asteroseismic studies of a sample of magnetic pulsators.
Aims: The CoRoT satellite revealed that the B3IV star HD 43317 is a hybrid SPB/β Cep-type pulsator that has a wealth o…
Transport-driven formation of a polar ozone layer on Mars
Montmessin, Franck; Lefèvre, Franck
Since the seasonal and spatial distribution of ozone on Mars was detected by the ultraviolet spectrometer onboard the spacecraft Mariner 7, our understanding has evolved considerably thanks to parallel efforts in observations and modelling. At low-to-mid latitudes, martian ozone is distributed vertically in two main layers, a near-surface layer an…
Self-consistent retrieval of temperature profiles and cloud structure in the northern hemisphere of Venus using VIRTIS/VEX and PMV/VENERA-15 radiation measurements
Kappel, D.; Arnold, G.; Haus, R.
Improved radiative transfer simulation and multi-window retrieval procedures (MWR) are described that are applied to investigate thermal structure and cloud features in the nightside atmosphere of Venus over the northern hemisphere. Comparative analyses of spectroscopic data, which were recorded independently in different parts of the infrared spe…
RX J0440.9 + 4431: a persistent Be/X-ray binary in outburst
Klochkov, D.; Ferrigno, C.; Bozzo, E. +3 more
The persistent Be/X-ray binary
High-cadence and High-resolution Hα Imaging Spectroscopy of a Circular Flare's Remote Ribbon with IBIS
Xu, Yan; Liu, Chang; Jing, Ju +6 more
We present an unprecedented high-resolution Hα imaging spectroscopic observation of a C4.1 flare taken with the Interferometric Bidimensional Spectrometer (IBIS) in conjunction with the adaptive optics system at the 76 cm Dunn Solar Telescope on 2011 October 22 in the active region NOAA 11324. Such a two-dimensional spectroscopic observation cover…
A multiwavelength view of cooling versus AGN heating in the X-ray luminous cool-core of Abell 3581
Fabian, A. C.; Giacintucci, S.; Salomé, P. +12 more
We report the results of a multiwavelength study of the nearby galaxy group, Abell 3581 (z = 0.0218). This system hosts the most luminous cool core of any nearby group and exhibits active radio mode feedback from the supermassive black hole in its brightest group galaxy, IC 4374. The brightest galaxy has suffered multiple active galactic nucleus o…
Observing extended sources with the Herschel SPIRE Fourier Transform Spectrometer
Valtchanov, I.; Wu, R.; Hopwood, R. +20 more
The Spectral and Photometric Imaging Receiver (SPIRE) on the European Space Agency's Herschel Space Observatory utilizes a pioneering design for its imaging spectrometer in the form of a Fourier Transform Spectrometer (FTS). The standard FTS data reduction and calibration schemes are aimed at objects with either a spatial extent that is much large…
The plasma density distribution in the inner region of Saturn's magnetosphere
Gurnett, D. A.; Persoon, A. M.; Kurth, W. S. +3 more
Electron density measurements derived from the upper hybrid resonance frequency have been obtained from the Cassini Radio and Plasma Wave Science experiment over a 7 year period from 28 October 2004 through 7 November 2011. Additional density measurements inside the orbit of Enceladus and outside the orbit of Rhea have made it possible to expand a…
The roles of star formation and AGN activity of IRS sources in the HerMES fields
Feltre, A.; Hatziminaoglou, E.; Hernán-Caballero, A. +16 more
In this work, we explore the impact of the presence of an active galactic nucleus (AGN) on the mid- and far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in the same galaxies. To do this, we apply a multicomponent, multiband spectral synthesis technique to a sample of 250 µm selected g…