Science Archives Publication System

Dominant Nuclear Outflow Driving Mechanisms in Powerful Radio Galaxies

DOI: 10.1086/515391 Bibcode: 2007ApJ...661...70B

O'Dea, Christopher P.; Axon, David J.; Koekemoer, Anton +4 more

In order to identify the dominant nuclear outflow mechanisms in active galactic nuclei, we have undertaken deep, high-resolution observations of two compact radio sources (PKS 1549-79 and PKS 1345+12) with the Advanced Camera for Surveys (ACS) aboard the Hubble Space Telescope. Not only are these targets known to have powerful emission-line outflo…

2007 • The Astrophysical Journal

eHST 34

A Deep Chandra, Very Large Array, and Spitzer Infrared Array Camera Study of the Very Low Luminosity Nucleus of the Elliptical NGC 821

DOI: 10.1086/520711 Bibcode: 2007ApJ...667..749P

Elvis, M.; Pellegrini, S.; Baldi, A. +5 more

The relatively nearby (distance = 24.1 Mpc) elliptical galaxy NGC 821 hosts an extreme example of a quiescent central massive black hole, for which deep Chandra observations revealed a nuclear source for the first time, with L_2-10keV/L_Edd~10^-8. We present here a multiwavelength study of this nucleus, including Very…

2007 • The Astrophysical Journal

eHST 34

Initial Helioseismic Observations by Hinode/SOT

DOI: 10.1093/pasj/59.sp3.S637 Bibcode: 2007PASJ...59S.637S

Tsuneta, Saku; Shimizu, Toshifumi; Zhao, Junwei +12 more

Results from initial helioseismic observations by the Solar Optical Telescope on-board Hinode are reported. It has been demonstrated that intensity oscillation data from the Broadband Filter Imager can be used for various helioseismic analyses. The k - ω power spectra, as well as the corresponding time-distance cross-correlation function, which pr…

2007 • Publications of the Astronomical Society of Japan

Hinode 34

Compton Telescope with a Coded Aperture Mask: Imaging with the INTEGRAL/IBIS Compton Mode

DOI: 10.1086/521325 Bibcode: 2007ApJ...668.1259F

Laurent, P.; Lebrun, F.; Limousin, O. +1 more

Compton telescopes provide good sensitivity over a wide field of view in the difficult energy range from a few hundred keV to several MeV. Their angular resolution is, however, poor and strongly energy dependent. We present a novel experimental design associating a coded mask and a Compton detection unit to overcome these pitfalls. It maintains th…

2007 • The Astrophysical Journal

INTEGRAL 34

Triggering Mechanism for the Filament Eruption on 2005 September 13 in NOAA Active Region 10808

DOI: 10.1086/521139 Bibcode: 2007ApJ...668..533N

Shibata, Kazunari; Okamoto, Takenori J.; Yokoyama, Takaaki +3 more

On 2005 September 13 a filament eruption accompanied by a halo coronal mass ejection (CME) occurred in the most flare-productive active region, NOAA 10808, in solar cycle 23. Using multiwavelength observations before the filament eruption on September 13, we investigate the processes leading to the catastrophic eruption. We find that the filament …

2007 • The Astrophysical Journal

SOHO 34

Spontaneous Generation of Self-Organized Solitary Wave Structures at Earth's Magnetopause

DOI: 10.1103/PhysRevLett.99.205006 Bibcode: 2007PhRvL..99t5006T

Davies, J. A.; Vaivads, A.; Dunlop, M. W. +5 more

Spontaneous formation of solitary wave structures has been observed in Earth’s magnetopause, and is shown to be caused by the breakup of a zonal flow by the action of drift wave turbulence. Here we show matched observations and modeling of coherent, large-scale solitary electrostatic structures, generated during the interaction of short-scale drif…

2007 • Physical Review Letters

Cluster 34

Observation of Interactions and Eruptions of Two Filaments

DOI: 10.1007/s11207-007-0213-y Bibcode: 2007SoPh..242...53S

Zhang, Hongqi; Liu, Yu; Wang, Haimin +4 more

We present new observations of the interactions of two close, but distinct, Hα filaments and their successive eruptions on 5 November 1998. The magnetic fields of the filaments are both of the sinistral type. The interactions between the two filaments were initiated mainly by an active filament of one of them. Before the filament eruptions, two da…

2007 • Solar Physics

SOHO 34

Properties of the dust cloud caused by the Deep Impact experiment

DOI: 10.1016/j.icarus.2006.10.004 Bibcode: 2007Icar..187..208J

Jorda, L.; Lara, L. M.; Lamy, P. +7 more

We present an analysis of the observations of the Deep Impact event performed by the OSIRIS narrow angle camera aboard the Rosetta spacecraft over two weeks, in an effort to characterize the cometary dust grains ejected from the nucleus of Comet 9P/Tempel 1. We adopt a Monte Carlo approach to generate calibrated synthetic images, and a linear comb…

2007 • Icarus

Rosetta 34

Ionic Charge States of Solar Energetic Particles: A Clue to the Source

DOI: 10.1007/s11214-007-9207-1 Bibcode: 2007SSRv..130..273K

Klecker, B.; Möbius, E.; Popecki, M. A.

The ionic charge of solar energetic particles (SEP) as observed in interplanetary space is an important parameter for the diagnostic of the plasma conditions at the source region and provides fundamental information about the acceleration and propagation processes at the Sun and in interplanetary space. In this paper we review the new measurements…

2007 • Space Science Reviews

SOHO 33

Detection of the first thermonuclear X-ray burst from AX J1754.2-2754

DOI: 10.1134/S1063773707120043 Bibcode: 2007AstL...33..807C

Grebenev, S. A.; Chelovekov, I. V.

When analyzing the archival data of the INTEGRAL observatory, we detected an intense X-ray burst recorded on April 16, 2005, by the JEM-X and IBIS/ISGRI telescopes from the weak and poorly studied source AX J1754.2-2754. Analysis of its time profiles and spectra allows this event to be attributed to type I X-ray bursts associated with thermonuclea…

2007 • Astronomy Letters

INTEGRAL 33