Search Publications
The Herschel Virgo Cluster Survey . VII. Dust in cluster dwarf elliptical galaxies
Bomans, D. J.; Bianchi, S.; Fritz, J. +27 more
We use the science demonstration phase data of the Herschel Virgo Cluster Survey to search for dust emission of early-type dwarf galaxies in the central regions of the Virgo cluster as an alternative way of identifying the interstellar medium. We present the first possible far-infrared detection of cluster early-type dwarf galaxies: VCC 781 and VC…
Near-infrared survey of high mass X-ray binary candidates
Torrejón, J. M.; Negueruela, I.; Smith, D. M. +1 more
Context. The INTEGRAL satellite is detecting a large population of new X-ray sources that were missed by previous missions because of high obscuration and, in some cases, very short duty cycles. The nature of these sources must be addressed by characterizing their optical and/or infrared counterparts.
Aims: We investigate the nature of the op…
Comparing eclipse observations of the 2008 August 1 solar corona with an MHD model prediction
Riley, P.; Linker, J. A.; Mikić, Z. +7 more
Context. The structure of the white-light and emission solar coronas and their MHD modelling are the context of our work.
Aims: A comparison is made between the structure of the solar corona as observed during the 2008 August 1 total eclipse from Mongolia and that predicted by an MHD model.
Methods: The model has an improved energy formu…
The supergiant fast X-ray transients XTE J1739-302 and IGR J08408-4503 in quiescence with XMM-Newton
Campana, S.; Israel, G.; Stella, L. +5 more
Context. Supergiant fast X-ray transients are a subclass of high mass X-ray binaries that host a neutron star accreting mass from the wind of its OB supergiant companion. They are characterized by an extremely pronounced and rapid variability in X-rays, which still lacks an unambiguous interpretation. A number of deep pointed observations with XMM…
The Herschel Virgo Cluster Survey. III. A constraint on dust grain lifetime in early-type galaxies
Bomans, D. J.; Bianchi, S.; Fritz, J. +28 more
Passive early-type galaxies (ETGs) provide an ideal laboratory for studying the interplay between dust formation around evolved stars and its subsequent destruction in a hot gas. Using Spitzer-IRS and Herschel data we compare the dust production rate in the envelopes of evolved AGB stars with a constraint on the total dust mass. Early-type galaxie…
The Vega debris disc: A view from Herschel
Heras, A. M.; Walker, H. J.; Ivison, R. J. +37 more
We present five band imaging of the Vega debris disc obtained using the Herschel Space Observatory. These data span a wavelength range of 70-500 µm with full-width half-maximum angular resolutions of 5.6-36.9”. The disc is well resolved in all bands, with the ring structure visible at 70 and 160 µm. Radial profiles of the disc surface …
The XMM-Newton Wide Angle Survey (XWAS): the X-ray spectrum of type-1 AGN
Ebrero, J.; Page, M. J.; Carrera, F. J. +7 more
Aims: We discuss the broad band X-ray properties of one of the largest samples of X-ray selected type-1 AGN to date (487 objects in total), drawn from the XMM-Newton Wide Angle Survey (XWAS). The objects presented in this work cover 2-10 keV (rest-frame) luminosities from 1042-1045 erg s-1 and are detected up …
Evidence of small-scale magnetic concentrations dragged by vortex motion of solar photospheric plasma
Vargas Domínguez, S.; Balmaceda, L.; Domingo, V. +2 more
Vortex-type motions have been measured by tracking bright points in high-resolution observations of the solar photosphere. These small-scale motions are thought to be determinant in the evolution of magnetic footpoints and their interaction with plasma and therefore likely to play a role in heating the upper solar atmosphere by twisting magnetic f…
Herschel photometric observations of the nearby low metallicity irregular galaxy NGC 6822
Elbaz, D.; Pérez-Fournon, I.; Bock, J. J. +57 more
We present the first Herschel PACS and SPIRE images of the low-metallicity galaxy NGC 6822 observed from 70 to 500 µm and clearly resolve the H ii regions with PACS and SPIRE. We find that the ratio 250/500 is dependent on the 24 µm surface brightness in NGC 6822, which would locally link the heating processes of the coldest phases of …
Herschel/HIFI observations of high-J CO lines in the NGC 1333 low-mass star-forming region
de Graauw, Th.; Liseau, R.; Braine, J. +60 more
Herschel/HIFI observations of high-J lines (up to Ju = 10) of 12CO, 13CO and C18O are presented toward three deeply embedded low-mass protostars, NGC 1333 IRAS 2A, IRAS 4A, and IRAS 4B, obtained as part of the Water In Star-forming regions with Herschel (WISH) key program. The spectrally-resolved HIFI da…