Search Publications
Atomic data for astrophysics: improved collision strengths for Fe viii
Del Zanna, G.; Badnell, N. R.
We describe, and present the results of, a new large-scale R-matrix scattering calculation for the electron collisional excitation of Fe viii. We first discuss the limitations of the previous calculations, in particular concerning some strong EUV lines observed in the solar corona by the Hinode EUV Imaging Spectrometer. We then present a new targe…
Relativistic reflection in the average X-ray spectrum of active galactic nuclei in the Véron-Cetty and Véron catalogue
Barcons, X.; Falocco, S.; Miniutti, G. +2 more
Context. The X-ray spectra of active galactic nuclei (AGN) unveil properties of matter around the super-massive black hole (SMBH).
Aims: We investigate the X-ray spectra of AGN focusing on Compton reflection and fluorescence. These are two of the most important processes of interaction between primary radiation and circumnuclear material that…
On the Fe abundance peak formation in cool-core clusters of galaxies: hints from cluster WARPJ1415.1+3612 at z = 1.03
Nonino, Mario; Rosati, Piero; Tozzi, Paolo +5 more
We present a detailed study of the iron content of the core of the high-redshift cluster WARPJ1415.1+3612 (z = 1.03). By comparing the central Fe mass excess observed in this system, MFeexc = (1.67 ± 0.40) × 109 M⊙, with those measured in local cool-core systems, we infer that the bulk of the mass excess…
First detection of rotational CO line emission in a red giant branch star
Groenewegen, M. A. T.
Context. For stars with initial masses below ~1 M⊙, the mass loss during the first red giant branch (RGB) phase dominates mass loss in the later asymptotic giant branch (AGB) phase. Nevertheless, mass loss on the RGB is still often parameterised by a simple Reimers law in stellar evolution models.
Aims: To try to detect CO thermal …
Analysis of X-ray spectral variability and black hole mass determination of the NLS1 galaxy Mrk 766
Titarchuk, L.; Gilli, R.; Giacchè, S.
We present an XMM-Newton time-resolved spectral analysis of the narrow-line Seyfert 1 galaxy Mrk 766. We analysed eight available observations taken between May 2000 and June 2005 with the EPIC-pn camera in order to investigate the X-ray spectral variability produced by changes in the mass accretion rate. The 0.2 - 10 keV spectra are extracted in …
Searching for highly obscured AGNs in the XMM-Newton serendipitous source catalog
Ranalli, P.; Georgantopoulos, I.; Lanzuisi, G. +9 more
The majority of active galactic nuclei (AGNs) are obscured by large amounts of absorbing material that makes them invisible at many wavelengths. X-rays, given their penetrating power, provide the most secure way for finding these AGNs. The XMM-Newton serendipitous source catalog, of which 3XMM-DR4 is the latest version, is the largest catalog of X…
A Gemini/GMOS study of the physical conditions and kinematics of the blue compact dwarf galaxy Mrk 996
Thuan, Trinh X.; Izotov, Yuri I.; Carrasco, Eleazar R. +1 more
Aims: We present an integral field spectroscopic study with the Gemini Multi-Object Spectrograph (GMOS) of the unusual blue compact dwarf (BCD) galaxy
Methods: We show through velocity and dispersion maps, emission-line intensity and ratio maps, and by a new technique of electron density limit imaging that the…
XMM-Newton observation of the Galactic supernova remnant W51C (G49.1-0.1)
Sasaki, Manami; Heinitz, Cornelia; Warth, Gabriele +1 more
Context. The supernova remnant (SNR)
Aims: Diffuse X-ray emission from the interior of the SNR can reveal element abundances in the different emission regions and she…
IGR J17488-2338: a newly discovered giant radio galaxy
Venturi, T.; Bird, A. J.; Ubertini, P. +4 more
We present the discovery of a large-scale radio structure associated with IGR J17488-2338, a source recently discovered by INTEGRAL and optically identified as a broad-line AGN at redshift 0.24. At low frequencies, the source properties are those of an intermediate-power FR II radio galaxy with a linear size of 1.4 Mpc. This new active galaxy is t…
The 2.35 year itch of Cygnus OB2 #9. III. X-ray and radio emission analysis based on 3D hydrodynamical modelling
Blomme, R.; Nazé, Y.; Pittard, J. M. +1 more
Context. The wind-wind collision in a massive star binary system leads to the generation of high temperature shocks that emit at X-ray wavelengths and, if particle acceleration is effective, may exhibit non-thermal radio emission. Cyg OB2#9 is one of a small number of massive star binary systems in this class.
Aims: X-ray and radio data recen…