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VLBI for better gravimetry in SELENE
Noda, H.; Tamura, Y.; Tsuruta, S. +17 more
The Japanese lunar explorer SELENE (SElenological and Engineering Explorer), to be launched in 2007, will for the first time utilize VLBI observations in lunar gravimetry investigations. This will particularly improve the accuracy to which the low degree gravitational harmonics and the gravity field near the limb can be measured, and when combined…
AG Draconis observed with XMM-Newton
Bernabei, S.; Rossi, C.; Frasca, A. +5 more
Context:
Aims: Study of the X-ray spectrum of this peculiar binary system, covering both quiescence and activity periods, is necessary to investigate the physics of the high temperature spectral component, and…
Inversion solutions of the elliptic cone model for disk frontside full halo coronal mass ejections
Zhao, X. P.
A new algorithm is developed for inverting six unknown elliptic cone model parameters from five observed CME halo parameters. It is shown that the halo parameter α includes the information on the coronal mass ejection (CME) propagation direction denoted by two model parameters. On the basis of the given halo parameter α, two approaches are present…
Photometric redshifts with surface brightness priors
Connolly, Andrew; Jain, Bhuvnesh; Stabenau, Hans F.
We use galaxy surface brightness as prior information to improve photometric redshift (photo-z) estimation. We apply our template-based photo-z method to imaging data from the ground-based VVDS survey and the space-based GOODS field from HST, and use spectroscopic redshifts to test our photometric redshifts for different galaxy types and redshifts…
Expansion Velocities and Core Masses of Bright Planetary Nebulae in the Virgo Cluster
Freeman, Kenneth C.; Gerhard, Ortwin; Ciardullo, Robin +5 more
The line-of-sight velocities and [O III] 5007 Å expansion velocities are measured for 11 planetary nebulae (PNs) in the Virgo Cluster core, at 15 Mpc distance, with the FLAMES spectrograph on the ESO VLT. These PNs are located about halfway between the two giant elliptical galaxies M87 and M86. From the [O III] 5007 Å line profile widths, the aver…
Extended 3He-rich Periods of Solar Energetic Particles in Structured Solar Wind
Mason, G. M.; Kocharov, L.; Laivola, J. +2 more
We have surveyed helium isotope abundance data (1997-2005) measured with the Ultra-Low-Energy Isotope Spectrometer (ULEIS) on the Advanced Composition Explorer (ACE) and have found multiday periods of 3He-rich solar energetic particles (SEPs) in the energy range of ~0.4-10 MeV nucleon-1 with 3He/4He ~ 0.…
Ionospheric oxygen ions dominant bursty bulk flows: Cluster and Double Star observations
Zhang, H.; Zong, Q. -G.; Daly, P. W. +5 more
Two extreme oxygen-rich bursty bulk flows (BBFs) with predominant ionospheric O+ ions have been observed on 8 November 2004 by the Cluster and Double Star spacecraft during a strong magnetic storm time period with Dst = -373 nT. The oxygen densities in two BBFs are found to be 3-5 times larger than the hydrogen densities and the oxygen …
Tailward flow of energetic neutral atoms observed at Venus
Kallio, E.; Barabash, S.; Gunell, H. +7 more
The Analyzer of Space Plasma and Energetic Atoms (ASPERA-4) experiment on Venus Express provides the first measurements of energetic neutral atoms (ENAs) from Venus. The results improve our knowledge on the interaction of the solar wind with a nonmagnetized planet and they present an observational constraint to existing plasma models. We character…
A Lyman Break Galaxy Candidate at z ~ 9
Teplitz, Harry I.; Siana, Brian; Malkan, Matthew A. +3 more
We report the discovery of a z ~ 9 Lyman break galaxy candidate, selected from the NICMOS Parallel Imaging Survey as a J-dropout with J110 - H160 = 1.7. Spitzer/IRAC photometry reveals that the galaxy has a blue H160 - 3.6 µm color and a spectral break between 3.6 and 4.5 µm. We interpret this break as …
Reconstruction of Cluster Masses Using Particle Based Lensing. I. Application to Weak Lensing
Goldberg, David M.; Deb, Sanghamitra; Ramdass, Vede J.
We present Particle Based Lensing (PBL), a new technique for gravitational lensing mass reconstructions of galaxy clusters. Traditionally, most methods have employed either a finite inversion or gridding to turn observational lensed galaxy ellipticities into an estimate of the surface mass density of a galaxy cluster. We approach the problem from …