Search Publications
Water Masers associated with Star Formation in the Antennae Galaxies
Darling, Jeremy; Johnson, Kelsey; Brogan, Crystal
We present Very Large Array (VLA) observations with 80 mas resolution (~9 pc) of the recently discovered Galactic-analog (GA)-H2O masers in the Antennae interacting galaxies (NGC 4038/NGC 4039; Arp244). Three regions of water maser emission are detected: two in the "interaction region" (IAR) and the third ~5farcs6 (gsim600 pc) west of t…
Observations of Double-Periodic X-Ray Emission in Interacting Systems of Solar Flare Loops
Zimovets, I. V.; Struminsky, A. B.
We investigate the M1.8 solar flare of 20 October 2002. The flare was accompanied by quasi-periodic pulsations (QPP) of both thermal and nonthermal hard X-ray emissions (HXR) observed by RHESSI in the 3 - 50 keV energy range. Analysis of the HXR time profiles in different energy channels made with the Lomb periodogram has indicated two statistical…
Interplanetary coronal mass ejection influence on high energy pick-up ions at Venus
Fedorov, A.; Luhmann, J. G.; Zhang, T. L. +4 more
We have used the ion mass analyzer (IMA) and magnetometer (MAG) on Venus Express (VEX) to study escaping O + during interplanetary coronal mass ejections (ICMEs). Data from 389 VEX orbits during 2006 and 2007 revealed 265 samples of high energy pick-up ion features in 197 separate orbits. Magnetometer data during the same time period sh…
X-rays from Saturn: a study with XMM-Newton and Chandra over the years 2002-05
Branduardi-Raymont, G.; Elsner, R. F.; Rodriguez, P. +1 more
Aims: We approach the study of Saturn and its environment in a novel way using X-ray data, by making a systematic and uniform spectral analysis of all the X-ray observations of the planet to date.
Methods: We present the results of the two most recent (2005) XMM-Newton observations of Saturn together with the re-analysis of an earlier (2…
Venus' atomic hot oxygen environment
Lammer, H.; Shematovich, V. I.; Macher, W. +6 more
We present a Monte Carlo study of the atomic hot oxygen corona of Venus. In this model we consider elastic, inelastic, and quenching collisions between the traced hot particle and the ambient neutral atmosphere as well as differential cross sections to determine the scattering angle in the collisions. We also include rotational and vibrational exc…
Extended emission from short gamma-ray bursts detected with SPI-ACS/INTEGRAL
Minaev, P. Yu.; Pozanenko, A. S.; Loznikov, V. M.
The short duration ( T 90 < 2 s) gamma-ray bursts (GRBs) detected in the SPI-ACS experiment onboard the INTEGRAL observatory are investigated. Averaged light curves have been constructed for various groups of events, including short GRBs and unidentified short events. Extended emission has been found in the averaged light curves of b…
Titan's native ocean revealed beneath some 45km of ice by a Schumann-like resonance
Sotin, Christophe; Béghin, Christian; Hamelin, Michel
After five years of thorough analysis of data from the Huygens Probe that descended into Titan's atmosphere in January 2005, we report major findings inferred from measurements of low frequency waves and atmospheric conductivity. The data account for the observation of a Schumann-like resonance trapped within Titan's atmospheric cavity. On Earth, …
On the long-term variability of Jupiter’s winds and brightness as observed from Hubble
Simon-Miller, Amy A.; Gierasch, Peter J.
Hubble Space Telescope Wide Field Planetary Camera 2 imaging data of Jupiter were combined with wind profiles from Voyager and Cassini data to study long-term variability in Jupiter's winds and cloud brightness. Searches for evidence of wind velocity periodicity yielded a few latitudes with potential variability; the most significant periods were …
Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi
Wang, L.; Filippenko, A. V.; Brown, P. J. +13 more
We present optical photometry and spectra for the Type Ia supernova (SN Ia) 2007gi in the nearby galaxy NGC 4036. SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities (vexp) approaching ∼15,500 km s-1 near-maximum brightness (compared …
Influence of hot plasma pressure on the global structure of Saturn’s magnetodisk
Coates, A. J.; Thomsen, M. F.; Wilson, R. J. +4 more
Using a model of force balance in Saturn's disk-like magnetosphere, we show that variations in hot plasma pressure can change the magnetic field configuration. This effect changes (i) the location of the magnetopause, even at fixed solar wind dynamic pressure, and (ii) the magnetic mapping between ionosphere and disk. The model uses equatorial obs…