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Flare-Associated Coronal Mass Ejections with Large Accelerations
Moon, Y. -J.; Dryer, M.; Cho, K. S. +3 more
It is well known that while flare-associated coronal mass ejections (CMEs) show higher speeds and little acceleration in the corona, filament-associated CMEs have lower speeds and large accelerations. In this paper, we examine three flare-associated CMEs with relatively large accelerations as counterexamples of the former tendency. The estimated a…
Solar and solar-wind isotopic compositions
Wimmer-Schweingruber, Robert F.; Wiens, Roger C.; Bochsler, Peter +1 more
With only a few exceptions, the solar photosphere is thought to have retained the mean isotopic composition of the original solar nebula, so that, with some corrections, the photosphere provides a baseline for comparison of all other planetary materials. There are two sources of information on the photospheric isotopic composition: optical observa…
Far-Ultraviolet Observations of Molecular Hydrogen in the Diffuse Interstellar Medium of Starburst Galaxies
Martin, Crystal L.; Aloisi, Alessandra; Hoopes, Charles G. +5 more
The 905-1180 Å spectral range of FUSE includes numerous transitions of molecular hydrogen, making it possible to study H2 in diffuse interstellar environments directly through absorption measurements. We have searched for H2 absorption in five starburst galaxies: NGC 1705, NGC 3310, NGC 4214, M83 (NGC 5236), and NGC 5253. We …
Multiwavelength Analysis of an X1.6 Flare of 2001 October 19
Ding, M. D.; Li, J. P.
An X1.6 two-ribbon flare was observed on 2001 October 19 using the imaging spectrograph at the Solar Tower of Nanjing University. We obtained a time series of two-dimensional Hα line spectra. Combining the observations by the Nobeyama Radioheliograph (NoRH), the Transition Region and Coronal Explorer (TRACE), the Yohkoh soft X-ray telescope (SXT) …
An XMM-Newton study of the RGH 80 galaxy group
Böhringer, H.; Matsushita, K.; Xue, Y. -J.
We present an X-ray study of the galaxy group RGH 80, observed by XMM-Newton. The X-ray emission of the gas is detected out to ∼462 h-150 kpc, corresponding to ∼0.45 r200. The group is relatively gas rich and luminous with respect to its temperature of 1.01 ± 0.01 keV. Using the deprojected spectral analysis, we fi…
Very cold cores in the Taurus Molecular Ring as seen by ISO
Lemke, D.; Haas, M.; Onishi, T. +2 more
Three prominent cold objects of the
Deep Photometry in a Remote M31 Major-Axis Field Near G1
Ho, Luis C.; Gebhardt, Karl; Rich, R. Michael +2 more
We present photometry from Hubble Space Telescope (HST) Wide Field Planetary Camera 2 parallel imagery of a remote M31 field at a projected distance of ~34 kpc from the nucleus near the southwest major axis. This field is near the globular cluster G1, and near one of the candidate tidal plumes identified in the survey of Ferguson et al. (2002). Th…
INTEGRAL observations of the PSR B1259-63/SS2883 system after the 2004 periastron passage
Mereghetti, S.; Rodriguez, J.; Walter, R. +3 more
The millisecond pulsar
The XMM-Newton view of the X-ray halo and jet of NGC 6251
Cheung, C. C.; Tavecchio, F.; Mushotzky, R. F. +3 more
We present an XMM-Newton observation of the radio jet and diffuse halo of the nearby radio galaxy NGC 6251. The EPIC spectrum of the galaxy's halo is best-fitted by a thermal model with temperature kT ∼ 1.6 keV and sub-solar abundances. Interestingly, an additional hard X-ray component is required to fit the EPIC spectra of the halo above 3 keV, a…
WIYN Open Cluster Study. XIX. Main-Sequence-Fitting Distances to Open Clusters Using V-K Color-Magnitude Diagrams
Sarajedini, Ata; Brandt, Ken; Grocholski, Aaron J. +1 more
We have combined existing optical magnitudes for stars in seven open clusters and 54 field stars with the corresponding JHKs photometry from the Two Micron All Sky Survey (2MASS). Combining optical with near-IR photometry broadens the color baseline, minimizing the influence of photometric errors and allowing better discrimination betwe…