Search Publications
PKS 0537-286, carrying the information of the environment of SMBHs in the early Universe
Covino, S.; Ghisellini, G.; Pian, E. +9 more
Context. The high-redshift (z = 3.1) blazar PKS 0537-286, belonging to the flat spectrum radio quasar blazar subclass, is one of the most luminous active galactic nuclei (AGN) in the Universe. Blazars are very suitable candidates for multiwavelength observations. Indeed, the relativistic beaming effect at work within the jet enhances their luminos…
The central region of spiral galaxies as seen by Herschel. M 81, M 99, and M 100
Elbaz, D.; Bock, J. J.; Clements, D. L. +57 more
With appropriate spatial resolution, images of spiral galaxies in thermal infrared (~10 µm and beyond) often reveal a bright central component, distinct from the stellar bulge, superimposed on a disk with prominent spiral arms. ISO and Spitzer studies have shown that much of the scatter in the mid-infrared colors of spiral galaxies is relate…
An XMM-Newton view of planetary nebulae in the Small Magellanic Cloud. The X-ray luminous central star of SMP SMC 22
Rauch, T.; Haberl, F.; Tiengo, A. +5 more
During an X-ray survey of the Small Magellanic Cloud, carried out with the XMM-Newton satellite, we detected significant soft X-ray emission from the central star of the high-excitation planetary nebula SMP SMC 22. Its very soft spectrum is reproduced well with a non-local thermodynamical equilibrium model atmosphere composed of H, He, C, N, and O…
Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae
Strassmeier, K. G.; Weber, M.; Granzer, T. +12 more
Context. The single rapidly-rotating G0 giant 31 Comae has been a puzzle because of the absence of photometric variability despite its strong chromospheric and coronal emissions. As a Hertzsprung-gap giant, it is expected to be at the stage of rearranging its moment of inertia, hence likely also its dynamo action, which could possibly be linked wi…
Wide band observations of the X-ray burster GS 1826-238
Titarchuk, L.; Farinelli, R.; Cocchi, M. +1 more
Context. GS 1826-238 is a well-studied X-ray bursting neutron star in a low mass binary system. Thermal Comptonisation by a hot electron cloud (kTe ~ 20 keV) is a widely accepted mechanism accounting for its high energy emission, while the nature of most of its soft X-ray output is not completely understood. A further low energy compone…
The origin of the [C II] emission in the S140 photon-dominated regions. New insights from HIFI
Boulanger, F.; France, K.; Le Petit, F. +38 more
Using Herschel's HIFI instrument, we observe C ii along a cut through S140, as well as high-J transitions of CO and HCO+ at two positions on the cut, corresponding to the externally irradiated ionization front and the embedded massive star-forming core IRS1. The HIFI data were combined with available ground-based observations and modele…
A very young component in the pre-eminent starburst region of the Small Magellanic Cloud
Heydari-Malayeri, M.; Selier, R.
Context. Despite extensive research on various components of the N66/NGC 346 complex, few studies have so far focused on N66A, which is a special object in the whole complex and therefore deserves scrutiny. The study of this compact H ii region and its fellow objects seems important in the framework of massive star formation in the Magellanic Clou…
An X-ray study of the SNR G344.7-0.1 and the central object CXOU J170357.8-414302
Combi, J. A.; Luque-Escamilla, P. L.; Pérez-González, P. G. +7 more
Aims: We report results of an X-ray study of the supernova remnant (SNR) G344.7-0.1 and the point-like X-ray source located at the geometrical center of the SNR radio structure.
Methods: The morphology and spectral properties of the remnant and the central X-ray point-like source were studied using data from the XMM-Newton and Chandra sa…
Herschel/HIFI observations of spectrally resolved methylidyne signatures toward the high-mass star-forming core NGC 6334I
Falgarone, E.; Maret, S.; Henning, T. +65 more
Context. In contrast to the more extensively studied dense star-forming cores, little is known about diffuse gas surrounding star-forming regions.
Aims: We study the molecular gas in the Galactic high-mass star-forming region NGC 6334I, which contains diffuse, quiescent components that are inconspicuous in widely used molecular tracers such a…
Ultraviolet and visible photometry of asteroid (21) Lutetia using the Hubble Space Telescope
Stern, S. A.; Feldman, P. D.; A'Hearn, M. F. +10 more
Context. The asteroid (21) Lutetia is the target of a planned close encounter by the Rosetta spacecraft in July 2010. To prepare for that flyby, Lutetia has been extensively observed by a variety of astronomical facilities.
Aims: We used the Hubble Space Telescope (HST) to determine the albedo of Lutetia over a wide wavelength range, extendin…