Search Publications
Q2122-444: A Naked Active Galactic Nucleus Fully Dressed
Foschini, L.; Saviane, I.; Monaco, L. +6 more
Based on previous spectral and temporal optical studies, Q2122-444 has been classified as a naked active galactic nucleus (AGN) or true type 2 AGN, that is, an AGN that genuinely lacks a broad-line region (BLR). Its optical spectrum seemed to possess only narrow forbidden emission lines that are typical of type 2 (obscured) AGNs, but the long-term…
Phase relations between energetic neutral atom intensities and kilometric radio emissions at Saturn
Gurnett, D. A.; Krimigis, S. M.; Kurth, W. S. +2 more
The intensities of energetic neutral atoms (ENAs) from Saturn's ring current were cross-correlated with Saturn kilometric radiation (SKR, 100-400 kHz) to determine their phase relations. The cross correlations were obtained for three intervals in early 2007 when Cassini was at high northern latitudes and the Ion and Neutral Camera (INCA) could opt…
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: Cluster Observation of Electrostatic Solitary Waves around Magnetic Null Point in Thin Current Sheet
Fu, Song; Zhou, Meng; Wang, Jing-Fang +5 more
Electrostatic solitary waves (ESWs) are observed in the vicinity of the magnetic null of the widely studied magnetic reconnection taking place at the near-earth tail when current sheet becomes dramatic thinning during substorm time on 1 October 2001. We use the Imada method for the 2-D reconnection model and study the characteristics of ESWs near …
High-Altitude Production of Titan's Aerosols
Young, D. T.; Lunine, J. I.; Westlake, J. +3 more
Measurements with the Cassini Ion and Neutral Mass Spectrometer (INMS) and two Cassini Plasma Spectrometer (CAPS) sensors, the Ion beam Spectrometer (IBS) and the Electron Spectrometer (ELS), have revealed the presence of a significant population of heavy hydrocarbon and nitrile species well above the homopause, with masses as large as several tho…
A multiwavelength view of the protostellar binary IRAS 04325+2402: a case for turbulent fragmentation
Scholz, A.; Saviane, I.; Jayawardhana, R. +6 more
IRAS 04325+2402 (hereinafter IRAS 04325) is a complex protostellar system hosting two young stellar objects (AB and C) at a separation of 1250 au. Here, we present a new deep Gemini imaging and spectroscopy for the system covering the wavelength regime from 1 to 12 µm as well as Submillimeter Array interferometry at 870 µm, in combinat…
Location and size of the global source region of whistler mode chorus
Santolík, O.; Parrot, M.; Hayosh, M.
We use multicomponent measurements of the four Cluster spacecraft and a backward ray tracing simulation to estimate the location and size of the global source of whistler mode chorus emissions in the magnetic equatorial plane. For the first time, analysis is made in a broad range of latitudes in both hemispheres along a single Cluster orbit. Our r…
Suzaku Observation of the Southeastern Rim of the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +2 more
X-ray measured metal abundances of the rim of the Cygnus Loop are known to have two patterns. One, seen at narrow regions along the outermost edge, is 0.5-times the solar value, and the other, seen in the remainder of the rim, is 0.2-times the solar value. While the former is ``normal'', as the ISM around the Cygnus Loop, the latter is unexpectedl…
Detection of Multiple Bipolar Flows in NGC 7027 with Submillimeter Array
Kwok, Sun; Lim, Jeremy; Hirano, Naomi +6 more
Highly collimated multiple bipolar flows are detected with a 3'' resolution in the HCO+ (J = 3-2) and HCN (J = 3-2) lines in the young planetary nebula NGC 7027 with the Submillimeter Array. The HCO+ and HCN flows coincide in location and velocity with compact and fast CO flows detected with ~6'' resolutions with other millim…
Infrared photometry and evolution of mass-losing AGB stars. III. Mass loss rates of MS and S stars
Guandalini, R.
Context. The asymptotic giant branch (AGB) phase marks the end of the evolution for low- and intermediate-mass stars, which are fundamental contributors to the mass return to the interstellar medium and to the chemical evolution of galaxies. The detailed understanding of mass loss processes is hampered by the poor knowledge of the luminosities and…
Statistical Study on the Decay Phase of Solar Near-relativistic Electron Events
Lario, D.
We study the decay phase of solar near-relativistic (53-315 keV) electron events as observed by the Advanced Composition Explorer (ACE) and the Ulysses spacecraft during solar cycle 23. By fitting an exponential function (exp - t/τ) to the time-intensity profile in the late phase of selected solar near-relativistic electron events, we examine the …