Zobrazeno 1 - 10
of 49
pro vyhledávání: '"TURNSHEK, D. A."'
Autor:
Quiret, S., Péroux, C., Zafar, T., Kulkarni, V. P., Jenkins, E. D., Milliard, B., Rahmani, H., Popping, A., Sandhya, R. M., Turnshek, D. A., Monier, E. M.
The Circum-Galactic Medium (CGM) can be probed through the analysis of absorbing systems in the line-of-sight to bright background quasars. We present measurements of the metallicity of a new sample of 15 sub-damped Lyman-$\alpha$ absorbers (sub-DLAs
Externí odkaz:
http://arxiv.org/abs/1602.02564
Publikováno v:
Astrophys.J. 630 (2005) 108-114
The local power law relationship between the surface densities of neutral hydrogen gas and star formation rate (SFR) can be used to explore the SFR properties of damped Lyman alpha (DLA) systems at higher redshift. We find that while the SFR densitie
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505418
We discuss issues concerning the physical nature of intervening MgII quasar absorption systems in light of results from our recent surveys using SDSS EDR QSO spectra and data obtained at the MMT. These surveys indicate an excess of weak $W_0^{\lambda
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505134
Autor:
Khare, P., York, D. G., Berk, D. Vanden, Kulkarni, V. P., Crotts, A. P. S., Welty, D. E., Lauroesch, J. T., Richards, G. T., Alsayyad, Y., Kumar, A., Lundgren, B., Shanidze, N., Vanlandingha, J., Baugher, B., Hall, P. B., Jenkins, E. B., Menard, B., Rao, S., Turnshek, D., Yip, C. W.
We find evidence for dust in the intervening QSO absorbers from the spectra of QSOs in the Sloan Digital Sky Survey Data Release 1. No evidence is found for the 2175 A feature which is present in the Milky Way dust extinction curve. The extinction cu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0504532
Publikováno v:
Astrophys.J. 628 (2005) 637-654
We present the results of a MgII absorption-line survey using QSO spectra from the SDSS EDR. Over 1,300 doublets with rest equivalent widths greater than 0.3\AA and redshifts $0.366 \le z \le 2.269$ were identified and measured. We find that the $\la
Externí odkaz:
http://arxiv.org/abs/astro-ph/0410493
Autor:
Price, P. A., Harrison, F. A., Galama, T. J., Reichart, D. E., Axelrod, T. S., Berger, E. J., Bloom, J. S., Busche, J., Cline, T., Diercks, A., Djorgovski, S. G., Frail, D. A., Gal-Yam, A., Halpern, J., Holtzman, J. A., Hunt, M., Hurley, K., Jacoby, B., Kimble, R., Kulkarni, S. R., Mirabal, N., Morrison, G., Ofek, E., Pevunova, O., Sari, R., Schmidt, B. P., Turnshek, D., Yost, S.
We present multi-color light-curves of the optical afterglow of GRB 000926. Beginning ~1.5 days after the burst, the light-curves of this GRB steepen measurably. The existence of such achromatic breaks are usually taken to be an important observation
Externí odkaz:
http://arxiv.org/abs/astro-ph/0012303
New optical and infrared observations along the sight-line toward the quasar OI 363 (0738+313) are presented and discussed. Excluding systems which lack confirming UV spectroscopic observations of the actual Lyman alpha line, this sight-line presentl
Externí odkaz:
http://arxiv.org/abs/astro-ph/0010573
Some results from an imaging program to identify low-redshift (0.09
Externí odkaz:
http://arxiv.org/abs/astro-ph/0009096
We report the discovery of two low redshift HI 21cm absorbers, one at z = 0.2212 towards the z_{em} = 0.630 quasar OI 363 (B0738+313), and the other at z = 0.3127 towards PKS B1127-145 (z_{em} = 1.187). Both were found during a survey of MgII selecte
Externí odkaz:
http://arxiv.org/abs/astro-ph/9803243
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