Search Publications
Saturn's ULF wave foreshock boundary: Cassini observations
Dougherty, M. K.; Mazelle, C.; Bertucci, C. +2 more
Even though the solar wind is highly supersonic, intense ultra-low frequency (ULF) wave activity has been detected in regions just upstream of the bow shocks of magnetized planets. This feature was first observed ahead of the Earth's bow shock, and the corresponding region was called the ULF wave foreshock, which is embedded within the planet's fo…
Warm gas in the rotating disk of the Red Rectangle: accurate models of molecular line emission
Alcolea, J.; Bujarrabal, V.
Aims: We aim to study the excitation conditions of the molecular gas in the rotating disk of the Red Rectangle, the only post-asymptotic-giant-branch object in which the existence of an equatorial rotating disk has been demonstrated. For this purpose, we developed a complex numerical code that accurately treats radiative transfer in 2D, adapt…
Multiple Fast Molecular Outflows in the Pre-planetary Nebula CRL 618
Lee, Chin-Fei; Sahai, Raghvendra; Sánchez Contreras, Carmen +2 more
CRL 618 is a well-studied pre-planetary nebula. It has multiple highly collimated optical lobes, fast molecular outflows along the optical lobes, and an extended molecular envelope that consists of a dense torus in the equator and a tenuous round halo. Here we present our observations of this source in CO J = 3-2 and HCN J = 4-3 obtained with the …
A Suzaku Discovery of a Slowly Varying Hard X-Ray Continuum from the Type I Seyfert Galaxy NGC 3516
Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya +1 more
The bright type I Seyfert galaxy NGC 3516 was observed by Suzaku twice, in 2005 October 12-15 and 2009 October 28-November 2, for a gross time coverage of 242 and 544 ks and a net exposure of 134 and 255 ks, respectively. The 2-10 keV luminosity was 2.8 × 1041 erg s-1 in 2005 and 1.6 × 1041 erg s-1 in 20…
Method for inferring the axis orientation of cylindrical magnetic flux rope based on single-point measurement
Zhang, T. L.; Zong, Q. -G.; Dunlop, M. W. +6 more
We develop a new simple method for inferring the orientation of a magnetic flux rope, which is assumed to be a time-independent cylindrically symmetric structure via the direct single-point analysis of magnetic field structure. The model tests demonstrate that, for the cylindrical flux rope regardless of whether it is force-free or not, the method…
A comparison of magnetic overshoots at the bow shocks of Mercury and Saturn
Anderson, B. J.; Masters, A.; Korth, H. +5 more
The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft at Mercury and the Cassini spacecraft at Saturn provide us with orbiters around planets at more diverse heliocentric distances than ever before. The dramatically different solar wind conditions at these two planets should mean that Mercury's bow shock is consi…
Observational study of the cooling behavior of interstellar helium pickup ions in the inner heliosphere
Bochsler, Peter; Gloeckler, George; Isenberg, Philip A. +4 more
velocity distribution of interstellar pickup ions (PUIs) has typically been described as evolving through fast pitch angle scattering followed by adiabatic cooling while being transported radially outward with the solar wind. In combination, the ionization rate, which controls the radial profile of the interstellar neutrals, and the cooling proces…
Spectral Variation of Hard X-Ray Emission from the Crab Nebula with the Suzaku Hard X-Ray Detector
Enoto, Teruaki; Fukazawa, Yasushi; Makishima, Kazuo +6 more
The Crab Nebula is one of the brightest and most stable sources in the X-ray sky. Year-scale flux variation from the object was recently revealed in the hard X-ray band by four satellites. This marked the first detection of year-scale variability from pulsar wind nebulae in the hard X-ray band. The Crab Nebula has been observed at least once a yea…
L1448-MM Observations by the Herschel Key Program, "Dust, Ice, and Gas In Time" (DIGIT)
Choi, Minho; Lee, Jeong-Eun; Lee, Jinhee +7 more
We present Herschel/Photodetector Array Camera and Spectrometer (PACS) observations of L1448-MM, a Class 0 protostar with a prominent outflow. Numerous emission lines are detected at 55 <λ < 210 µm including CO, OH, H2O, and [O I]. We investigate the spatial distribution of each transition to find that lines from low energy …
CoRoT 102749568: mode identification in a δ Scuti star based on regular spacings
Auvergne, M.; Guenther, E. W.; Gandolfi, D. +10 more
Context. The high accuracy of space data increased the number of the periodicities determined for pulsating variable stars, but the mode identification is still a critical point in the non-asymptotic regime.
Aims: We use regularities in frequency spacings for identifying the pulsation modes of the recently discovered δ Sct star ID 102749568. …