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Potential Variations in the Interstellar N I Abundance
Andersson, B. -G.; McCandliss, Stephan R.; Moos, H. Warren +1 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph observations of the weak interstellar N I λ1160 doublet toward 17 high-density sight lines [N(Htot)>=1021 cm-2]. When combined with published data, our results reveal variations in the fractional N I abundance showi…
Observations of the neutral gas and dust in the radio galaxy 3C 305
Beswick, R.; Leahy, J. P.; Sparks, W. B. +5 more
We present MERLIN and Hubble Space Telescope (HST) observations of the central region of the nearby radio galaxy 3C 305 and use them to study the gas and dust in this object. The MERLIN observations are of neutral hydrogen (HI) absorption against the strong non-thermal 20 cm continuum seen towards the central 4 kpc of 3C 305. Our ~0.2 arcsec (160 …
Orbits and masses of twenty double stars discovered by Paul Couteau
Docobo, J. A.; Ling, J. F.
In this article we present the orbits and masses of 20 double stars discovered by P. Couteau at the Nice Observatory (France), namely WDS 01450+2703 (COU 750), 03321+4340 (1688), 03423+3141 (691), 06503+2409 (768), 12409+2708 (596),14138+3059 (606), 15390+2545 (612), 16584+3943 (1289), 17075+3810 (1291), 17221+2310 (415), 18035+ 4032 (1785), 18043…
Measurements of Flux Cancellation During Filament Formation
Wood, Paul; Martens, Piet
We study the process of flux cancellation and filament formation in a nest of three decaying active regions, using data from SOHO MDI and EIT, and Hα images from Meudon and Big Bear. We find that there are no apparent EUV loops connecting the two poles of a cancelling feature prior to and during cancellation, suggesting an absence of coronal magne…
The INTEGRAL Mass Model - TIMM
Hill, A. B.; Bird, A. J.; Dean, A. J. +8 more
The INTEGRAL Mass Model (TIMM) was started in 1995 and aimed to create a detailed geometrical model of the whole INTEGRAL satellite on computer. In parallel, a comprehensive Monte Carlo simulation code (called GGOD) has been developed. The mass model and the Monte Carlo code together enable the in-flight operation of INTEGRAL to be simulated at th…
Imaging and Demography of the Host Galaxies of High-Redshift Type Ia Supernovae
Filippenko, Alexei V.; Williams, Benjamin F.; Garnavich, Peter +24 more
We present the results of a study of the host galaxies of high-redshift Type Ia supernovae (SNe Ia). We provide a catalog of 18 hosts of SNe Ia observed with the Hubble Space Telescope (HST) by the High-z Supernova Search Team, including images, scale lengths, measurements of integrated (Hubble-equivalent) BVRIZ photometry in bands where the galax…
Serendipitous active galactic nuclei in the XMM-Newton fields of Markarian 205 and QSO 0130-403
O'Brien, P. T.; Reeves, J. N.; Page, K. L. +2 more
The X-ray spectra of serendipitously observed active galactic nuclei (AGN) in the XMM-Newton fields of Mrk 205 and QSO 0130-403 are analysed. The sample consists of 23 objects, none of which is detected at radio frequencies, with a median X-ray luminosity of ~4 × 1044 erg s-1 and redshifts ranging from ~0.1 to just over 3. Th…
Photoionized O VI absorbers toward the bright QSO HE 0515-4414
Reimers, D.; Baade, R.; Levshakov, S. A. +1 more
We report on detailed Monte Carlo inversion analysis of five O Vi systems from the spectrum of the bright quasar HE 0515-4414 (zem = 1.71). The associated system at zabs = 1.697 with the neutral hydrogen column density N(H I) = 4.4*E13 cm-2, shows pronounced absorption from highly ionized transitions of …
Near-Infrared Adaptive Optics Imaging of the Embedded Cluster NGC 2024
Beck, Tracy L.; Close, L. M.; Simon, M.
We present the results of a high-resolution near-infrared adaptive optics survey of the young obscured star-forming region NGC 2024. Out of the total 73 stars detected in the adaptive optics survey of the cluster, we find three binaries and one triple. The resulting companion star fraction, 7%+/-3% in the separation range of 0.35"-2.3" (145-950 AU…
Solar Wind Effects on the Transport of 3-10 MeV Cosmic-Ray Electrons from Solar Minimum to Solar Maximum
Fichtner, H.; Ferreira, S. E. S.; Potgieter, M. S. +2 more
We investigate the effects on the transport of a few MeV (~7 MeV) Jovian and Galactic electrons for different solar wind speed scenarios applicable to different heliospheric conditions. A three-dimensional, steady state model is used based on numerically solving Parker's transport equation, including the Jovian electron source, to compare model co…