Search Publications
Analysis and Modeling of Two Flare Loops Observed by AIA and EIS
Ding, M. D.; Li, Y.; Qiu, J.
We analyze and model an M1.0 flare observed by SDO/AIA and Hinode/EIS to investigate how flare loops are heated and evolve subsequently. The flare is composed of two distinctive loop systems observed in extreme ultraviolet (EUV) images. The UV 1600 Å emission at the feet of these loops exhibits a rapid rise, followed by enhanced emission in differ…
Hydrocode simulations of the largest crater on asteroid Lutetia
Cremonese, G.; Marzari, F.; Preusker, F. +9 more
The flyby of the Main Belt asteroid Lutetia by the Rosetta spacecraft allows the camera OSIRIS to obtain very good images of about half of the body at the maximum resolution of 60 m per pixel. From the images and radio-science experiment, a density of about (3.4±0.3) g/cm3 has been inferred for the asteroid. Many impact craters have bee…
The solar hydrogen Lyman α to Lyman β line ratio
Vial, J. -C.; Curdt, W.; Schühle, U. +2 more
Aims: We investigate the variation in the solar hydrogen Lyman α (Lyα) to Lyman β (Lyβ) line ratio as a function of the solar activity by taking into account new results obtained by SoHO/SUMER and TIMED/SEE.
Methods: We reanalyze data of quiet and active regions previously collected with the LPSP multichannel instrument on OSO8. We then …
The peculiar isolated neutron star in the Carina Nebula. Deep XMM-Newton and ESO-VLT observations of 2XMM J104608.7-594306
Motch, C.; Treves, A.; Pilia, M. +5 more
While fewer in number than the dominant rotation-powered radio pulsar population, peculiar classes of isolated neutron stars (INSs) - which include magnetars, the ROSAT-discovered "Magnificent Seven" (M7), rotating radio transients (RRATs), and central compact objects in supernova remnants (CCOs) - represent a key element in understanding the neut…
Ionized X-ray reverberation mapping: testing a light-bending model for 1H0707-495
Chainakun, P.; Young, A. J.
The narrow-line Seyfert 1 galaxy 1H0707-495 has shown the first clear evidence of X-ray reverberation in which the soft, disc-reflection and Fe-L-dominated 0.3-1 keV band lags behind the hard, continuum-dominated 1-4 keV band by ≈ 30 s. A simple reflection model, however, cannot explain the different amplitudes of variability between the continuum…
A hydrodynamic study of the circumstellar envelope of α Scorpii
Reimers, D.; Hagen, H. -J.; Baade, R. +1 more
Context. Both the absolute mass-loss rates and the mechanisms that drive the mass loss of late-type supergiants are still not well known. Binaries such as α Sco provide the most detailed empirical information about the winds of these stars.
Aims: Our goal was to improve the binary technique for the determination of the mass-loss rate of
The Absence of Cold Dust around Warm Debris Disk Star HD 15407A
Onaka, Takashi; Takita, Satoshi; Fukagawa, Misato +5 more
We report Herschel and AKARI photometric observations at far-infrared (FIR) wavelengths of the debris disk around the F3V star HD 15407A, in which the presence of an extremely large amount of warm dust (~500-600 K) has been suggested by mid-infrared (MIR) photometry and spectroscopy. The observed flux densities of the debris disk at 60-160 µ…
GRB 070912—A gamma-ray burst recorded from the direction to the galactic center
Frederiks, D. D.; Minaev, P. Yu.; Pozanenko, A. S. +3 more
The detection of GRB 070912 recorded in the field of view of the SPI, IBIS/ISGRI, and JEMX telescope on September 12, 2007, at 07h32m19s (UT) when analyzing the INTEGRAL archival data is reported. The burst is one of the well-localized events closest to the direction toward the Galactic center (less than [InlineMed…
Solar Polar X-Ray Jets and Multiple Bright Points: Evidence for Sympathetic Activity
Romoli, Marco; Sterling, Alphonse C.; Pucci, Stefano +1 more
We present an analysis of X-ray bright points (BPs) and X-ray jets observed by Hinode/X-Ray Telescope on 2007 November 2-4, within the solar northern polar coronal hole. After selecting small subregions that include several BPs, we followed their brightness evolution over a time interval of a few hours, when several jets were observed. We find tha…
The OH Venus nightglow spectrum: Intensity and vibrational composition from VIRTIS—Venus Express observations
Drossart, Pierre; Piccioni, Giuseppe; Gérard, Jean-Claude +1 more
Limb spectra of the OH nightglow emission corresponding to the Δv=1 and Δv=2 sequences have been collected with the VIRTIS infrared imaging spectrograph on board Venus Express between April 2006 and October 2008. A detailed statistical analysis shows that the peak intensity and altitude of the two vibrational sequences are significantly correlated…