Search Publications
A Multiwavelength Analysis of the Halo Planetary Nebula DdDm-1
Dufour, R. J.; Henry, R. B. C.; Kwitter, K. B. +1 more
We present new HST optical imagery as well as new UV and IR spectroscopic data obtained with the Hubble Space Telescope and Spitzer Space Telescope, respectively, of the halo planetary nebula DdDm-1. For the first time we present a resolved image of this object, which indicates that the morphology of DdDm-1 can be described as two orthogonal ellip…
Ion Anisotropy and High-Energy Variability of Large Solar Particle Events: A Comparative Study
Reames, Donald V.; Tan, Lun C.; Ng, Chee K.
We have made comparative studies of ion anisotropy and high-energy variability of solar energetic particle (SEP) events previously examined by the Solar, Heliospheric, and Interplanetary Environment (SHINE) Workshop campaign. We have found distinctly different characteristics of SEPs in two large "gradual" events having very similar solar progenit…
Multi-epoch spectroscopy of the globular cluster black hole in NGC 4472
Maccarone, T. J.; Kundu, A.; Zepf, S. E. +1 more
We present a study of the X-ray spectral properties of the highly variable X-ray emitting black hole in a globular cluster in the elliptical galaxy NGC 4472. The X-ray Multiple Mirror-Newton (XMM-Newton) spectrum of the source in its bright epoch is well described by a multiple blackbody model with a characteristic temperature kTin ~ 0.…
Flux transfer events simultaneously observed by Polar and Cluster: Flux rope in the subsolar region and flux tube addition to the polar cusp
Russell, C. T.; RèMe, H.; Lucek, E. A. +9 more
In this paper we present observational evidence of a flux transfer event observed simultaneously at low-latitude by Polar and at high-latitude by Cluster. This event occurs on 21 March 2002, when both Cluster and Polar are located near local noon but with a large latitudinal separation. During the event, Cluster is moving outbound from the polar c…
The Hubble Legacy Archive NICMOS grism data
Kümmel, M.; Haase, J.; Kuntschner, H. +6 more
The Hubble Legacy Archive (HLA) aims to create calibrated science data from the Hubble Space Telescope archive and make them accessible via user-friendly and Virtual Observatory (VO) compatible interfaces. It is a collaboration between the Space Telescope Science Institute (STScI), the Canadian Astronomy Data Centre (CADC) and the Space Telescope …
The Planck cluster survey
Arnaud, M.; Bartlett, J. G.; Chamballu, A. +2 more
The Planck Satellite will survey the entire sky in 9 millimeter/submillimeter bands and detect thousands of galaxy clusters via their thermal Sunyaev-Zel'dovich (SZ) effect. The unprecedented volume of the survey will permit the construction of a unique catalog of massive clusters out to redshifts of order unity. We describe the expected contents …
Bulk Compton motion in the luminous quasar 4C04.42?
de Rosa, A.; Ubertini, P.; Malizia, A. +2 more
We present the broadband analysis of the powerful quasar 4C04.42 (z = 0.965) observed by XMM-Newton and INTEGRAL. The 0.2-200keV spectrum is well reproduced with a hard power-law component (Γ ~ 1.2), augmented by a soft component below 2keV (observer frame), which is described by a thermal blackbody with temperature kT ⋍ 0.15keV. Alternatively, a …
Sequestration of Noble Gases by H+3 in Protoplanetary Disks and Outer Solar System Composition
Ceccarelli, C.; Mousis, O.; Pauzat, F. +1 more
We study the efficiency of the noble gas sequestration by the ion H+3 in the form of X H+3 complexes (with X = argon , krypton, or xenon) in gas-phase conditions similar to those encountered during the cooling of protoplanetary disks. We show that X H+3 complexes form very stable st…
XMM-Newton studies of a massive cluster of galaxies: RXC J2228.6+2036
Böhringer, H.; Pointecouteau, E.; Chen, Y. +2 more
We present the X-ray properties of a massive cluster of galaxies (RXC J2228.6+2036 at z = 0.421) using XMM-Newton data. The X-ray mass modeling is based on the temperature and density distributions of the intracluster medium derived using a deprojection method. We find that RXC J2228.6+2036 is a hot cluster (T500=8.92^+1.78-1.32
Evidence for Resonance Line Scattering in the Suzaku X-Ray Spectrum of the Cygnus Loop
Hughes, John P.; Miyata, Emi; Masai, Kuniaki
We present an analysis of the Suzaku observation of the northeastern rim of the Cygnus Loop supernova remnant. The high detection efficiency together with the high spectral resolution of the Suzaku X-ray CCD camera enables us to detect highly-ionized C and N emission lines from the Cygnus Loop. Given the significant plasma structure within the Suz…