Spectroscopic Analysis of H I Absorption Line Systems in 40 HIRES Quasars

التفاصيل البيبلوغرافية
العنوان:	Spectroscopic Analysis of H I Absorption Line Systems in 40 HIRES Quasars
المؤلفون:	Misawa, T., Tytler, D., Iye, M., Kirkman, D., Suzuki, N., Lubin, D., Kashikawa, N.
المصدر:	Astron.J.134:1634-1654,2007
سنة النشر:	2007
المجموعة:	Astrophysics
مصطلحات موضوعية:	Astrophysics
الوصف:	We list and analyze H I absorption lines at redshifts 2 < z < 4 with column density (12 < log(N_HI) < 19) in 40 high-resolutional (FWHM = 8.0 km/s) quasar spectra obtained with the Keck+HIRES. We de-blend and fit all H I lines within 1,000 km/s of 86 strong H I lines whose column densities are log(N_HI/[cm^-2]) > 15. Unlike most prior studies, we use not only Lya but also all visible higher Lyman series lines to improve the fitting accuracy. This reveals components near to higher column density systems that can not be seen in Lya. We list the Voigt profile fits to the 1339 H I components that we found. We examined physical properties of H I lines after separating them into several sub-samples according to their velocity separation from the quasars, their redshift, column density and the S/N ratio of the spectrum. We found two interesting trends for lines with 12 < log(N_HI) < 15 which are within 200-1000 km/s of systems with log(N_HI) > 15. First, their column density distribution becomes steeper, meaning relatively fewer high column density lines, at z < 2.9. Second, their column density distribution also becomes steeper and their line width becomes broader by about 2-3 km/s when they are within 5,000 km/s of their quasar. Comment: 32 pages, 14 figures, accepted for publication in the Astronomical Journal. A complete version with all tables and figures is available at http://www.astro.psu.edu/users/misawa/pub/Paper/40hires.ps.gz
نوع الوثيقة:	Working Paper
DOI:	10.1086/521557
URL الوصول:	http://arxiv.org/abs/0707.0006
رقم الأكسشن:	edsarx.0707.0006
قاعدة البيانات:	arXiv

الوصف
DOI:	10.1086/521557