Search Publications
Hot flow anomaly remnant in the far geotail?
Fedorov, A.; Sauvaud, J. -A.; Luhmann, J. G. +6 more
A hot flow anomaly (HFA) like event was observed by the Solar TErrestrial RElations Observatory (STEREO) in the night side magnetosheath in the far tail in February-March 2007. The magnetic signature of the tangential discontinuity was visible, but the resolution of the plasma ion data is not sufficient for our analysis, so a method is given to id…
Turbulent convective flows in the solar photospheric plasma
Giannattasio, F.; Berrilli, F.; Consolini, G. +3 more
> The origin of the 22-year solar magnetic cycle lies below the photosphere where multiscale plasma motions, due to turbulent convection, produce magnetic fields. The most powerful intensity and velocity signals are associated with convection cells, called granules, with a scale of typically 1 Mm and a lifetime of a few minutes. Small-scale mag…
AGN Activity and IGM Heating in the Fossil Cluster RX J1416.4+2315
Raychaudhury, S.; Sengupta, C.; Khosroshahi, H. G. +3 more
We study active galactic nucleus (AGN) activity in the fossil galaxy cluster RX J1416.4+2315. Radio observations were carried out using the Giant Metrewave Radio Telescope at two frequencies, 1420 and 610 MHz. A weak radio lobe that extends from the central nucleus is detected in the 610 MHz map. Assuming the radio lobe originated from the central…
The Subsurface Structure and Density of Cometary Nuclei
Lamy, P. L.; Toth, I.; Herique, A.
Little is known about the internal structure and density of cometary nuclei. Indirect evidences available so far are not compelling and these questions essentially remain a matter of speculation. It is therefore important to fully exploit the potential sources of information and this is particularly the case of radar observations which have the ca…
Where does the Thermospheric Ionospheric GEospheric Research (TIGER) Program go?
Schmidt, W.; Haberreiter, M.; Kretzschmar, M. +22 more
At the 10th Thermospheric Ionospheric GEospheric Research (TIGER/COSPAR) symposium held in Moscow in 2014 the achievements from the start of TIGER in 1998 were summarized. During that period, great progress was made in measuring, understanding, and modeling the highly variable UV-Soft X-ray (XUV) solar spectral irradiance (SSI), and its effects on…
Analysis of regional gullies within Noachis Terra, Mars: A complex relationship between slope, surface material and aspect
Hobbs, S. W.; Paull, D. J.; Clarke, J. D. A.
The precise mechanisms by which martian hillside gullies erode and their dependence on the local environment remain subjects of debate. We studied three sharp rimmed craters in Noachis Terra and 37 gully profiles using Context Camera (CTX), Mars Orbiter Laser Altimeter (MOLA) and High Resolution Stereo Camera (HRSC) data. We analysed the gully top…
Multi-wavelength Observations of the Black Widow Pulsar 2FGL J2339.6-0532 with OISTER and Suzaku
Nogami, Daisaku; Matsunaga, Noriyuki; Yoshida, Michitoshi +42 more
Multi-wavelength observations of the black widow binary system 2FGL J2339.6-0532 are reported. The Fermi gamma-ray source 2FGL J2339.6-0532 was recently categorized as a black widow in which a recycled millisecond pulsar (MSP) is evaporating the companion star with its powerful pulsar wind. Our optical observations show clear sinusoidal light curv…
Submm-bright X-ray-absorbed QSOs at z ∼ 2: insights into the coevolution of AGN and star formation
Page, M. J.; Symeonidis, M.; Stevens, J. A. +4 more
We have assembled a sample of five X-ray-absorbed and submm-luminous type 1 QSOs at z ∼ 2 which are simultaneously growing their central black holes through accretion and forming stars copiously. We present here the analysis of their rest-frame UV-to-submm spectral energy distributions (SEDs), including new Herschel data. Both AGN (direct and repr…
Characterization of OSIRIS NAC filters for the interpretation of multispectral data of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +39 more
Context. We interpret multicolor data from OSIRISNAC for the remote-sensing exploration of comet 67P/Churyumov-Gerasimenko.
Aims: We determine the most meaningful definition of color maps for the characterization of surface variegation with filters available on OSIRIS NAC.
Methods: We analyzed laboratory spectra of selected minerals and …
The contribution of faint galaxy wings to source-subtracted near-infrared background fluctuations
Donnerstein, R. L.
The source-subtracted, 1.1 and 1.6 µm NICMOS images used in earlier analyses of the near-infrared Hubble Ultra Deep Field contained residual flux in extended wings of identified sources that contributed an unknown amount to fluctuation power. When compared to the original results, a reanalysis after subtracting this residual flux shows that …