Zobrazeno 1 - 10 of 94 pro vyhledávání: '"A. F. Davidsen"'
2
The Rest‐Frame Extreme‐Ultraviolet Spectral Properties of Quasi‐stellar Objects
Autor: WeiKang Zheng, Arthur F. Davidsen, Randal C. Telfer, Gerard A. Kriss
Publikováno v: The Astrophysical Journal. 565:773-785
We use a sample of 332 Hubble Space Telescope spectra of 184 QSOs with z > 0.33 to study the typical ultraviolet spectral properties of QSOs, with emphasis on the ionizing continuum. Our sample is nearly twice as large as that of Zheng et al. (1997)
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::35484b3891b4506e8676d52475e86047
https://doi.org/10.1086/324689
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3
FUSEObservations of Cooling‐Flow Gas in the Galaxy Clusters A1795 and A2597
Autor: Edward M. Murphy, Bruce E. Woodgate, Esther M. Hu, William R. Oegerle, Arthur F. Davidsen, J. B. Hutchings, Kenneth R. Sembach, Lennox L. Cowie
Publikováno v: The Astrophysical Journal. 560:187-193
We present far-ultraviolet spectroscopy of the cores of the massive cooling flow clusters Abell 1795 and 2597 obtained with FUSE. As the intracluster gas cools through 3x10^5 K, it should emit strongly in the OVI 1032,1038 resonance lines. We report
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a3d75ba56a29cdd2ebb2bd97c172e71
https://doi.org/10.1086/322246
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4
[ITAL]Far Ultraviolet Spectroscopic Explorer[/ITAL] Observations of O [CSC]vi[/CSC] in High-Velocity Clouds
Autor: William P. Blair, H. W. Moos, Kenneth R. Sembach, William R. Oegerle, Brad K. Gibson, Edward M. Murphy, George Sonneborn, Edward B. Jenkins, Arthur F. Davidsen, Scott D. Friedman, Blair D. Savage, Jeffrey W. Kruk, Thomas B. Ake, Donald G. York, J. M. Shull, David J. Sahnow
Publikováno v: The Astrophysical Journal. 538:L31-L34
We have used moderate-resolution (FWHM ≈ 25 km s-1) spectra of active galactic nuclei and QSOs observed by the Far Ultraviolet Spectroscopic Explorer to make the first definitive measurements of absorption by hot gas in high-velocity clouds (HVCs)
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b34ac48bd1f2f0a72102ccce9936d37e
https://doi.org/10.1086/312785
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5
[ITAL]Far Ultraviolet Spectroscopic Explorer[/ITAL] Observations of Intrinsic Absorption in the Seyfert 1 Galaxy Markarian 509
Autor: Bruce E. Woodgate, J. B. Hutchings, Arthur F. Davidsen, Donald G. York, William R. Oegerle, Scott D. Friedman, Richard F. Green, M. S. Brotherton, Kenneth R. Sembach, Gerard A. Kriss, W. Zheng, Mary Elizabeth Kaiser, J. M. Shull
Publikováno v: The Astrophysical Journal. 538:L17-L21
We present far-ultraviolet spectra of the Seyfert 1 galaxy Mrk 509 obtained in 1999 November with the Far Ultraviolet Spectroscopic Explorer (FUSE). Our data span the observed wavelength range 915-1185 A at a resolution of ~20 km/s. The spectrum show
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b8deabfd8f163a558c7c52b2e6a4064a
https://doi.org/10.1086/312784
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6
Far‐Ultraviolet Spectroscopy of Venus and Mars at 4 A Resolution with the Hopkins Ultraviolet Telescope on Astro‐2
Autor: Samuel T. Durrance, Arthur F. Davidsen, Eric B. Burgh, Paul D. Feldman
Publikováno v: The Astrophysical Journal. 538:395-400
Far-ultraviolet spectra of Venus and Mars in the range 820-1840 A at 4 A resolution were obtained on 13 and 12 March 1995, respectively, by the Hopkins Ultraviolet Telescope (HUT), which was part of the Astro-2 observatory on the Space Shuttle Endeav
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8ea1491b0c595a98125ce565ef00a2c
https://doi.org/10.1086/309125
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8
A Far‐Ultraviolet Analysis of the Stellar Populations in Six Elliptical and S0 Galaxies
Autor: Ben Dorman, Thomas M. Brown, Henry C. Ferguson, Arthur F. Davidsen
Publikováno v: The Astrophysical Journal. 482:685-707
We have analyzed the far-ultraviolet (FUV) spectra of six elliptical and S0 galaxies in order to characterize their hot stellar populations. The spectra were obtained using the Hopkins Ultraviolet Telescope (HUT) in March 1995. These data, together w
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e6d223d45912fdef8f13fb6e731a19e
https://doi.org/10.1086/304187
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9
Final Astro‐1 Calibration of the Hopkins Ultraviolet Telescope: A Test of White Dwarf Model Atmospheres as Far‐Ultraviolet Calibration Standards
Autor: Jay B. Holberg, David S. Finley, Samuel T. Durrance, Gerard A. Kriss, Randy A. Kimble, Jeffrey W. Kruk, R. H. Buss, Arthur F. Davidsen
Publikováno v: The Astrophysical Journal. 482:546-568
We present the final calibration of the Hopkins Ultraviolet Telescope (HUT) for its flight during the Astro-1 space shuttle mission in 1990 December. The calibration is defined by a comparison between an observation obtained in flight of the hot DA w
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::07068ebb4aef35223c2a1c399f9b74d3
https://doi.org/10.1086/304105
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10
Evolution of Structure in the Intergalactic Medium and the Nature of the Lyα Forest
Autor: Arthur F. Davidsen, Hongguang Bi
Publikováno v: The Astrophysical Journal. 479:523-542
We have performed a detailed statistical study of the evolution of structure in a photoionized intergalactic medium (IGM) using analytical simulations to extend the calculation into the mildly non-linear density regime found to prevail at z = 3. Our
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa088ae2385a721f502ae1f890aedc42
https://doi.org/10.1086/303908
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