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ISO Long Wavelength Spectrograph Observations of Cold Dust in Galaxies
Madore, Barry F.; Bianchi, Simone; Trewhella, Matthew +2 more
We describe observations of five nearby galaxies obtained using the Long Wavelength Spectrograph (LWS) on the Infrared Space Observatory (ISO). We observed five galaxies, using spectrograph apertures positioned at the galactic center and in the outskirts of the disk, to compare the spectral energy distribution of the emitting dust at different pos…
COMPTEL limits on 26Al 1.809 MeV line emission from gamma2 Velorum
Knödlseder, J.; Morris, D.; Schönfelder, V. +7 more
The Wolf-Rayet binary system
Statistics of quiet Sun extreme ultraviolet intensities
Solanki, S. K.; Schühle, U.; Landi, E. +2 more
The frequency distribution of the extreme ultraviolet (EUV) emission line intensities in the quiet Sun has in the past often been modelled using two Gaussians. This gives adequate fits to observed distributions of average statistical significance. In this paper we test this and other distribution functions against observed distributions with excep…
EUV Full-Sun Imaged Spectral Atlas Using the SOHO Coronal Diagnostic Spectrometer
Brekke, Pål; Thompson, William T.
The Coronal Diagnostic Spectrometer (CDS) aboard the Solar and Heliospheric Observatory (SOHO) carries out a regular program of measuring the full-disk irradiance using the Normal Incidence Spectrograph (NIS). The full-disk solar spectrum is returned in the wavelength bands 308-379 Å and 513-633 Å, with a spectral resolution between 0.3 and 0.6 Å.…
On the Transition Region Explosive Events
Tarbell, T. D.; Ryutova, M. P.
We describe the properties of high-velocity and explosive events in the solar transition region determined from time series of data taken by the Transition Region and Coronal Explorer and the SUMER instrument on the Solar and Heliospheric Observatory (SOHO) simultaneously in several chromospheric and transition region lines co-aligned with high-re…
The impact of resolution on observed Hii region properties from WFPC2 observations of M 101
Fricke, K. J.; Pleuss, P. O.; Heller, C. H.
Two continuum subtracted Hα HST frames of
The Morphology of the Solar Upper Atmosphere During the Sunspot Minimum
Wilhelm, K.; Dammasch, I. E.; Feldman, U.
The solar upper atmosphere (SUA) is defined as the volume above the photosphere occupied by plasmas with electron temperatures, T_e, above ~ 2×10^4 K. Until the Skylab era, only little was known about the morphology of the SUA, while the quality of the spectroscopic observations was continually improving. A spherically symmetric atmosphere was ass…
Time evolution of galactic warps in prolate haloes
Ideta, M.; Hozumi, S.; Tsuchiya, T. +1 more
A recent observation with the Hipparcos satellite and some numerical simulations imply that the interaction between an oblate halo and a disc is inappropriate for the persistence of galactic warps. Following on from this, we have compared the time evolution of galactic warps in a prolate halo with that in an oblate halo. The haloes were approximat…
Physical Conditions in Circumstellar Gas Surrounding SN 1987A 12 Years after Outburst
Gull, Theodore R.; Pun, Chun S. J.; Lundqvist, Peter +3 more
Two-dimensional spectra of SN 1987A were obtained on 1998 November 14-15 (4282 days after outburst) with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). The slit sampled portions of the inner circumstellar ring at the east and west ansae as well as small sections of both the northern and southern outer ri…
An XMM pre-view of the cosmic network: galaxy groups and filaments
Pierre, M.; Gastaud, R.; Bryan, G.
A large fraction of the baryons today are predicted to be in hot, filamentary gas, which has yet to be detected. In this paper, we use numerical simulations of dark matter and gas to determine if these filaments and groups of galaxy will be observable by XMM. The simulated maps include free-free and line emission, galactic absorption, the XMM resp…