Search Publications
SAID: A turbulent plasmaspheric boundary layer
Santolik, O.; Mishin, E. V.; Puhl-Quinn, P. A.
This paper presents novel features of subauroral ion drifts (SAID) observed from a unique conjunction of the Cluster, DMSP, and Polar satellites, including the discovery of SAID-related plasma waves. These observations confirm and expand on our proposed concept of the SAID channel being a turbulent boundary layer, formed via a short circuit of the…
Breaking the σ8-Ω m Degeneracy Using the Clustering of High-z X-ray Active Galactic Nuclei
Basilakos, Spyros; Plionis, Manolis
The clustering of X-ray selected active galactic nuclei (AGNs) appears to be a valuable tool for extracting cosmological information. Using the recent high-precision angular clustering results of ~30,000 XMM-Newton soft (0.5-2 keV) X-ray sources, which have a median redshift of z ~ 1, and assuming a flat geometry, a constant in comoving coordinate…
Modeling the Enceladus plume-plasma interaction
Delamere, P. A.; Bagenal, F.; Fleshman, B. L.
We investigate the chemical interaction between Saturn's corotating plasma and Enceladus' volcanic plumes. We evolve a parcel of ambient plasma as it passes through a prescribed H2O plume using a physical chemistry model adapted for water-group reactions. The flow field is assumed to be that of a plasma around an electrically-conducting…
Physical Origin of Differences Among Various Measures of Solar Meridional Circulation
Ulrich, Roger K.; Dikpati, Mausumi; Gilman, Peter A.
We show that systematic differences between surface Doppler and magnetic element tracking measures of solar meridional flow can be explained by the effects of surface turbulent magnetic diffusion. Feature-tracking speeds are lower than plasma speeds in low and mid latitudes, because magnetic diffusion opposes poleward plasma flow in low latitudes …
Herschel observations of EXtra-Ordinary Sources (HEXOS): detecting spiral arm clouds by CH absorption lines
Menten, K. M.; Falgarone, E.; Martin, P. G. +67 more
We have observed CH absorption lines (J = 3/2, N = 1 ≤ftarrow J = 1/2, N = 1) against the continuum source Sgr B2(M) using the Herschel/HIFI instrument. With the high spectral resolution and wide velocity coverage provided by HIFI, 31 CH absorption features with different radial velocities and line widths are detected and identified. The narrower …
Water production in comet 81P/Wild 2 as determined by Herschel/HIFI
Blommaert, J. A. D. L.; Küppers, M.; Thomas, N. +42 more
The high spectral resolution and sensitivity of Herschel/HIFI allows for the detection of multiple rotational water lines and accurate determinations of water production rates in comets. In this Letter we present HIFI observations of the fundamental 110-101 (557 GHz) ortho and 111-00 (1113 GHz) para rota…
Dust is Forming Along the Red Giant Branch of 47 Tuc
Dalessandro, Emanuele; Ferraro, Francesco R.; Origlia, Livia +4 more
We present additional evidence that dust is really forming along the red giant branch (RGB) of 47 Tuc at luminosities ranging from above the horizontal branch to the RGB tip. The presence of dust had been inferred from an infrared excess in the (K - 8) color, with K measured from high spatial resolution ground-based near-IR photometry and "8" refe…
Cold fronts and multi-temperature structures in the core of Abell 2052
Simionescu, A.; Kaastra, J. S.; de Plaa, J. +3 more
Context. The physics of the coolest phases in the hot intra-cluster medium (ICM) of clusters of galaxies is yet to be fully unveiled. X-ray cavities blown by the central active galactic nucleus (AGN) contain enough energy to heat the surrounding gas and stop cooling, but locally blobs or filaments of gas appear to be able to cool to low temperatur…
X-ray and multiwavelength view of NGC 4278. A LINER-Seyfert connection?
Grosso, N.; Porquet, D.; Reeves, J. N. +3 more
Context. The emission mechanism responsible for the bulk of energy from radio to X-rays in low ionization emission line regions (LINERs) and low luminosity active galactic nuclei (LLAGN) has been long debated. Based on UV to X-ray and radio to UV flux ratios, some argue that LINERs/LLAGN are a scaled-down version of their more luminous predecessor…
An assessment of surface matching for the automated co-registration of MOLA, HRSC and HiRISE DTMs
Muller, Jan-Peter; Lin, Shih-Yuan; Mills, Jon P. +1 more
Martian topographic data has been collected by various exploration missions over the last decade. These products provide detailed topographic information and are invaluable for scientists to interpret and understand the geological and climate evolution which has occurred on Mars. In order to fully utilise these multi-sensor, multi-resolution and m…