Search Publications
XMM-Newton unveils the type 2 nature of the BLRG 3C 445
Guainazzi, Matteo; Ponti, Gabriele; Grandi, Paola +1 more
We present an observation of XMM-Newton that unambiguously reveals the `Seyfert 2' nature of the broad line radio galaxy 3C 445. For the first time the soft excess of this source has been resolved. It consists of unobscured scattered continuum flux and emission lines, likely produced in a warm photoionized gas near the pole of an obscuring torus. …
Weak lensing mass reconstruction of the galaxy cluster Abell 209
Becciani, U.; Radovich, M.; Mercurio, A. +3 more
Context: Weak lensing applied to deep optical images of clusters of galaxies provides a powerful tool to reconstruct the distribution of the gravitating mass associated to these structures.
Aims: We use the shear signal extracted by an analysis of deep exposures of a region centered around the galaxy cluster ABCG 209, at redshift z∼ 0.2, to de…
On Connecting the Dynamics of the Chromosphere and Transition Region with Hinode SOT and EIS
Harra, Louise K.; Warren, Harry P.; Hara, Hirohisa +14 more
We use coordinated Hinode SOT/EIS observations that include high-resolution magnetograms, chromospheric, and transition region (TR) imaging, and TR/coronal spectra in a first test to study how the dynamics of the TR are driven by the highly dynamic photospheric magnetic fields and the ubiquitous chromospheric waves. Initial analysis shows that the…
A probable accretion-powered X-ray pulsar in IGR J00370+6122
Kuiper, L.; Hermsen, W.; den Hartog, P. R. +2 more
Serendipitous and dedicated observations with the Rossi X-ray Timing Explorer (RXTE) and the International Gamma-Ray Astrophysics Laboratory (INTEGRAL) were analyzed to study the transient high-mass X-ray binary IGR J00370+6122, in particular to search for an accretion-powered pulsar as companion to the optically identified (Reig et al. 2005, A&am…
Identification of Variable Stars in COROT's First Main Observing Field (LRc1)
Deeg, H.; Deleuil, M.; Erikson, A. +7 more
The COROT space mission will monitor several target fields for up to 150 days to perform asteroseismology and to search for extrasolar planets by photometric transits. Variable stars in the target fields are important objects for additional scientific studies but can also disturb the search for planetary transits. A variability characterization of…
Discovery of an X-ray nebula around PSR J1718-3825 and implications for the nature of the γ-ray source HESS J1718-385
Carrigan, S.; Funk, S.; Gallant, Y. A. +5 more
Combined X-ray synchrotron and inverse-Compton γ-ray observations of pulsar wind nebulae (PWN) may help to elucidate the processes of acceleration and energy loss in these systems. In particular, such observations provide constraints on the particle injection history and the magnetic field strength in these objects. The newly discovered TeV γ-ray …
The 12 µm ISO-ESO-Sculptor and 24 µm Spitzer faint counts reveal a population of ULIRGs as dusty massive ellipticals. Evolution by types and cosmic star formation
Seymour, N.; Rocca-Volmerange, B.; de Lapparent, V. +1 more
Context: Multi-wavelength galaxy number counts provide clues to the nature of galaxy evolution. The interpretation per galaxy type of the mid-IR faint counts obtained with ISO and Spitzer, consistent with the analysis of deep UV-optical-near IR galaxy counts, provide new constraints on the dust and stellar emission. Discovering the nature of new p…
High spectral resolution UV to near-IR observations of Mars using HST/STIS
Ansty, T. M.; Bell, J. F.
We acquired high spectral and spatial resolution hyperspectral imaging spectrometer observations of Mars from near-UV to near-IR wavelengths (∼300 to 1020 nm) using the STIS instrument on the Hubble Space Telescope during the 1999, 2001, and 2003 oppositions. The data sets have been calibrated to radiance factor ( I/F) and map-projected for compar…
Hubble Space Telescope Multiepoch Imaging of the PSR B0540-69 System Unveils a Highly Dynamic Synchrotron Nebula
Caraveo, P. A.; Bignami, G. F.; De Luca, A. +1 more
PSR B0540-69 is the Crab twin in the Large Magellanic Cloud. The age and energetic and overall behavior of the two pulsars are very similar. The same is true for the general appearance of their pulsar wind nebulae (PWNe). Analysis of Hubble Space Telescope images spanning 10 yr unveiled significant variability in the PWN surrounding PSR B0540-69, …
Hubble Space Telescope Observations of Chromospheres in Metal-Deficient Field Giants
Smith, Graeme H.; Dupree, A. K.; Li, Timothy Q.
Hubble Space Telescope high-resolution spectra of metal-deficient field giants more than double the stars in previous studies, span ~3 mag on the red giant branch, and sample an abundance range [Fe/H] = -1 to -3. These stars, in spite of their age and low metallicity, possess chromospheric fluxes of Mg II (λ2800) that are within a factor of 4 of P…