Zobrazeno 1 - 10
of 416
pro vyhledávání: '"Boksenberg, A."'
Using Voigt-profile-fitting procedures on Keck HIRES spectra of nine QSOs we identify 1099 CIV absorber components clumped in 201 systems outside the Lyman forest over 1.6 < z < 4.4. With associated SiIV, CII, SiII and NV where available we investiga
Externí odkaz:
http://arxiv.org/abs/1410.3784
In Keck HIRES spectra of 9 QSOs we identify a sample of 908 CIV absorber components in 188 systems outside the Lyman forest in the redshift range 1.6 < z < 4.4, with related lines of SiIV, CII, SiII and NV. The properties of the CIV absorbers are alm
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307557
An extremely careful separation of the weak metal-line systems relating to the Lyman forest absorbers into individual ``single-phase ionization'' components with accurate parameters has yielded a large sample in the wide redshift range 1.9 < z < 4.4.
Externí odkaz:
http://arxiv.org/abs/astro-ph/9810502
Autor:
Weymann, Ray J., Jannuzi, Buell T., Lu, Limin, Bahcall, John N., Bergeron, Jacqueline, Boksenberg, Alec, Hartig, George F., Kirhakos, Sofia, Sargent, W. L. W., Savage, Blair D., Schneider, Donald P., Turnshek, David A., Wolfe, Arthur M.
Publikováno v:
ApJ, 506 (1998) 1
We present an analysis of the evolution of the Ly alpha absorption lines in the redshift interval 0.0 to \sim 1.5 based upon a sample of 987 lines identified in the spectra of 63 QSOs obtained with the Faint Object Spectrograph on the Hubble Space Te
Externí odkaz:
http://arxiv.org/abs/astro-ph/9806123
Autor:
Jannuzi, Buell T., Bahcall, John N., Bergeron, Jacqueline, Boksenberg, Alec, Hartig, George F., Kirhakos, Sofia, Sargent, W. L. W., Savage, Blair D., Schneider, Donald P., Turnshek, David A., Weymann, Ray J., Wolfe, Arthur M.
Publikováno v:
Astrophys.J.Suppl. 118 (1998) 1
We present a catalogue of absorption lines obtained from the analysis of the ultra-violet spectra of 66 quasars. The data were acquired with the Faint Object Spectrograph of the HST as part of the Quasar Absorption Line Survey, a Key Project for the
Externí odkaz:
http://arxiv.org/abs/astro-ph/9805148
Autor:
Boksenberg, Alec
An extremely careful analysis of the forest of weak metal-line systems at z ~ 2 has allowed the separation into individual `single-phase ionization' components with accurate parameters. The systems typically span several hundred km/s and within each
Externí odkaz:
http://arxiv.org/abs/astro-ph/9710258
Autor:
Jannuzi, B. T., Hartig, G. F., Kirhakos, S., Sargent, W. L. W., Turnshek, D. A., Weymann, R. J., Bahcall, J. N., Bergeron, J., Boksenberg, A., Savage, B. D., Schneider, D. P., Wolfe, A. M.
Publikováno v:
Astrophys.J. 470 (1996) L11-L14
We report the discovery of a high-ionization broad absorption line system at a redshift of z_abs=0.695 in the spectrum of the z_em=1.052 radio-quiet quasar PG 2302+039. Broad absorption with FWHM from 3,000 to 5,000 km/s is detected from C IV, N V, a
Externí odkaz:
http://arxiv.org/abs/astro-ph/9608080
Autor:
Bahcall, John N., Bergeron, Jacqueline, Boksenberg, Alec, hartig, George F., Jannuzi, Buell T., Kirhakos, Sofia, Sargent, W. L. W., Savage, Blair D., Schneider, Donald P., Turnshek, David A., Weymann, Ray J., Wolfe, Arthur M.
Publikováno v:
Astrophys.J. 457 (1996) 19-49
We present evidence that clumps of \lya lines are physically associated with about half of the extensive metal-line systems (absorption systems with four or more observed metal-line species) found in this paper, demonstrate that all four \lylimit sys
Externí odkaz:
http://arxiv.org/abs/astro-ph/9506124
We present the first high resolution polarization map of the ultraviolet emission from the outer jet in M87. The data were obtained by the Faint Object Camera (FOC) on the Hubble Space Telescope. The polarization map has a resolution of 0.2 arcsec an
Externí odkaz:
http://arxiv.org/abs/astro-ph/9505121
Autor:
Bates, B., Carson, P. P. D., Dufton, P. L., McKeith, C. D., Boksenberg, A., Kirkham, B., Pettini, M.
Publikováno v:
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1975 Jul . 279(1289), 379-390.
Externí odkaz:
https://www.jstor.org/stable/74386