Search Publications
Multi-point observations of the inner boundary of the plasma sheet during geomagnetic disturbances
Dandouras, I.; Glassmeier, K. -H.; Nakamura, R. +6 more
We report on the THEMIS and Double Star TC-1 observations at the geocentric distances of 3 < R < 8 R E during substorms on March 23, 2007. THEMIS crossed the inner boundary of the equatorial dusk-side plasma in the string-of-pearls configuration, allowing the dynamics of particle populations to be traced within time ranges from h…
The Origin of Polar Streamers in the Solar Corona
Llebaria, A.; Zhukov, A. N.; Lamy, P. +2 more
We investigate the large-scale three-dimensional (3D) structure of the solar corona near the maximum of the 23rd solar cycle in an attempt to determine the origin of polar streamers. We use a model that allows us to simulate the quasi-stationary configuration of the large-scale coronal density distribution. The coronal neutral line, as given by th…
Measurement of Mass and Spin of Black Holes with QPOs
Aschenbach, B.
There are now four low mass X-ray binaries with black holes which show twin resonant-like HFQPOs. Similar QPOs might have been found in Sgr A*. I review the power spectral density distributions of the three X-ray flares and the six NIR flares published for Sgr A* so far, in order to look for more similarities than just the frequencies between the …
A broad-band spectral analysis of eight radio-loud type 1 active galactic nuclei selected in the hard X-ray band
de Rosa, A.; Bird, A. J.; Fiocchi, M. +6 more
Starting from a complete sample of type 1 active galactic nuclei (AGN) observed by INTEGRAL in the 20-40 keV band, we have selected a set of eight AGN which can be classified as radio-loud objects according to their 1.4 GHz power density, radio-to-hard X-ray flux density ratio and radio morphology. The sample contains six broad-line radio Galaxies…
Analysis of MDI High-Degree Mode Frequencies and their Rotational Splittings
Schou, J.; Korzennik, S. G.; Rabello-Soares, M. C.
We present a detailed analysis of solar acoustic mode frequencies and their rotational splittings for modes with degree up to 900. They were obtained by applying spherical harmonic decomposition to full-disk solar images observed by the Michelson Doppler Imager onboard the Solar and Heliospheric Observatory spacecraft. Global helioseismology analy…
Photoemission Phenomena in the Solar System
Strobel, D. F.; Crovisier, J.; Cravens, T. E. +2 more
Much of what we know about the atmospheres of the planets and other bodies in the solar system comes from detection of photons over a wide wavelength range, from X-rays to radio waves. In this chapter, we present current information in various categories—measurements of the airglows of the terrestrial planets, the dayglows of the outer planets and…
An Upper Mass Limit on a Red Supergiant Progenitor for the Type II-Plateau Supernova SN 2006my
Leonard, Douglas C.; Kraus, Adam L.; Gal-Yam, Avishay +5 more
We analyze two pre-supernova (SN) and three post-SN high-resolution images of the site of the Type II-Plateau supernova SN 2006my in an effort to either detect the progenitor star or to constrain its properties. Following image registration, we find that an isolated stellar object is not detected at the location of SN 2006my in either of the two p…
Limits on the X-ray and optical luminosity of the progenitor of the Type Ia supernova 2007sr
Bassa, Cees; Nelemans, Gijs; Voss, Rasmus +1 more
We present Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 (WFPC2), Galaxy Evolution Explorer (GALEX) and Chandra observations of the position of the Type Ia supernova 2007sr in the Antennae galaxy, taken before the explosion. No source is found in any of the observations, allowing us to put interesting constraints on the progenitor lum…
The Signature of Evolving Turbulence in Quiet Solar Wind as Seen by Ulysses
Chapman, S. C.; Nicol, R. M.; Dendy, R. O.
Solar wind fluctuations, such as magnetic field or velocity, show power-law power spectra suggestive both of an inertial range of intermittent turbulence (with ~-5/3 exponent), and at lower frequencies, of fluctuations of coronal origin (with ~-1 exponent). The Ulysses spacecraft spent many months in the quiet fast solar wind above the Sun's polar…
[OIII] emitters in the field of the MRC0316-257 protocluster
Pentericci, L.; Rosati, P.; Stanford, S. A. +12 more
Venemans et al. found evidence for an overdensity of Lyα emission-line galaxies associated with the radio galaxy MRC0316-257 at z = 3.13 indicating the presence of a massive protocluster. Here, we present the results of a search for additional star-forming galaxies and active galactic nucleus (AGN) within the protocluster. Narrow-band infrared ima…