Search Publications
Cosmological constraints from the observed angular cross-power spectrum between Sunyaev-Zel'dovich and X-ray surveys
Aghanim, N.; Diego, J. M.; Douspis, M. +3 more
We present the first detection of the cross-correlation angular power spectrum between the thermal Sunyaev-Zel'dovich (tSZ) effect and the X-ray emission over the full sky. The tSZ effect and X-rays are produced by the same hot gas within groups and clusters of galaxies, which creates a naturally strong correlation between them that can be used to…
Linking Europa's plume activity to tides, tectonics, and liquid water
Roth, Lorenz; Rhoden, Alyssa Rose; Retherford, Kurt +1 more
Much of the geologic activity preserved on Europa's icy surface has been attributed to tidal deformation, mainly due to Europa's eccentric orbit. Although the surface is geologically young (30-80 Myr), there is little information as to whether tidally-driven surface processes are ongoing. However, a recent detection of water vapor near Europa's so…
UV Insights into the Complex Populations of M87 Globular Clusters
Anderson, J.; Milone, A. P.; Bedin, L. R. +7 more
We have imaged with Hubble Space Telescope WFC3/UVIS the central 2\buildrel{ \prime}\over{.} 7× 2\buildrel{ \prime}\over{.} 7 region of the giant elliptical galaxy M87, using the ultraviolet filter F275W. In combination with archival ACS/WFC data taken through the F606W and F814W filters, covering the same field, we have constructed integrated-lig…
XMM-Newton large program on SN1006 - I. Methods and initial results of spatially resolved spectroscopy
Vink, Jacco; Miceli, Marco; Bocchino, Fabrizio +2 more
Based on our newly developed methods and the XMM-Newton large program of SN1006, we extract and analyse the spectra from 3596 tessellated regions of this supernova remnant (SNR) each with 0.3-8 keV counts >104. For the first time, we map out multiple physical parameters, such as the temperature (kT), electron density (ne),…
Far-Infrared and Accretion Luminosities of the Present-day Active Galactic Nuclei
Woo, Jong-Hak; Matsuoka, Kenta
We investigate the relation between star formation (SF) and black hole accretion luminosities, using a sample of 492 type-2 active galactic nuclei (AGNs) at z\lt 0.22, which are detected in the far-infrared (FIR) surveys with AKARI and Herschel. We adopt FIR luminosities at 90 and 100 µm as SF luminosities, assuming the proposed linear propo…
Understanding the Internal Chemical Composition and Physical Processes of the Solar Interior
Basu, Sarbani; Turck-Chièze, Sylvaine; Grevesse, Nicolas +1 more
The Sun, the closest and most well studied of stars, is generally used as a standard that other stars are compared to. Models of the Sun are constantly tested with helioseismic data. These data allow us to probe the internal structure and dynamics of the Sun. Among the main sources of the data is the SOHO spacecraft that has been continuously obse…
Direction of interstellar hydrogen flow in the heliosphere: theoretical modelling and comparison with SOHO/SWAN data
Katushkina, O. A.; Izmodenov, V. V.; Alexashov, D. B.
The analysis of SOlar and Heliospheric Observatory (SOHO) Solar Wind ANisotropies (SWAN) data for backscattered solar Lyman α radiation performed by Lallement et al. showed for the first time that the average direction of interstellar hydrogen flow in the heliosphere is deflected by several degrees relative to the original direction of the interst…
Far-UV Spectroscopy of the Planet-hosting Star WASP-13: High-energy Irradiance, Distance, Age, Planetary Mass-loss Rate, and Circumstellar Environment
France, K.; Fossati, L.; Lendl, M. +3 more
Several transiting hot Jupiters orbit relatively inactive main-sequence stars. For some of those, the {log}{R}{HK}\prime activity parameter lies below the basal level (-5.1). Two explanations have been proposed so far: (i) the planet affects the stellar dynamo, (ii) the {log}{R}{HK}\prime measurements …
Observational hints of a pre-inflationary scale?
Gruppuso, A.; Sagnotti, A.
We argue that the lack of power exhibited by cosmic microwave background (CMB) anisotropies at large angular scales might be linked to the onset of inflation. We highlight observational features and theoretical hints that support this view, and present a preliminary estimate of the physical scale that would underlie the phenomenon.
The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
Gamen, R.; Maíz Apellániz, J.; Alfaro, E. J. +5 more
Aims. We present the first orbital solution for the O-type supergiant star HD 74194, which is the optical counterpart of the supergiant fast X-ray transient IGR J08408-4503. Methods. We measured the radial velocities in the optical spectrum of HD 74194, and we determined the orbital solution for the first time. We also analysed the complex Hα prof…