Hyperfine level-changing collisions of hydrogen atoms and tomography of the dark age universe

被引：125

作者：

Zygelman, B ^{[1
]}

机构：

[1] Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 622卷 / 02期

关键词：

atomic data; early universe; intergalactic medium; radio lines : general;

D O I：

10.1086/427682

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present accurate rates for spin exchange processes in collisions of hydrogen atoms for temperatures in the range 1 K < T < 300 K. A fully quantal, multichannel theory is employed in the calculations. We discuss the respective roles of spin exchange and long-range magnetic interactions in collisional redistribution of sublevel populations. We use the rates to calculate the spin temperature of hydrogen in the universe at 20 < z < 200 and explore its sensitivity to the collision data. We stress the important role of atomic collisions in enabling 21 cm tomography, recently proposed by Loeb & Zaldarriaga, of the "dark age" universe.

引用

收藏

页码：1356 / 1362

页数：7

相关论文

共 28 条

[1] SPIN CHANGE IN COLLISIONS OF HYDROGEN ATOMS [J].

ALLISON, AC ;

DALGARNO, A .

ASTROPHYSICAL JOURNAL, 1969, 158 (1P1) :423-&

[2] FREQUENCY SHIFTS IN SPIN-EXCHANGE OPTICAL PUMPING EXPERIMENTS [J].

BALLING, LC ;

PIPKIN, FM ;

HANSON, RJ .

PHYSICAL REVIEW A-GENERAL PHYSICS, 1964, 133 (3A) :A607-&

[3] In the beginning: the first sources of light and the reionization of the universe [J].

Barkana, R ;

Loeb, A .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 349 (02) :126-238

[4] CMB observations and the production of chemical elements at the end of the dark ages [J].

Basu, K ;

Hernández-Monteagudo, C ;

Sunyaev, RA .

ASTRONOMY & ASTROPHYSICS, 2004, 416 (02) :447-466

[5]

Bethe H. A., 1957, QUANTUM MECH ONE 2 E

[6] The spin-kinetic temperature coupling and the heating rate due to Lyα scattering before reionization:: Predictions for 21 centimeter emission and absorption [J].

Chen, XL ;

Miralda-Escudé, J .

ASTROPHYSICAL JOURNAL, 2004, 602 (01) :1-11

[7]

Choudhury TR, 2002, MON NOT R ASTRON SOC, V336, pL27, DOI 10.1046/j.1365-8711.2002.05984.x

[8] Probing beyond the epoch of hydrogen reionization with 21 centimeter radiation [J].

Ciardi, B ;

Madau, P .

ASTROPHYSICAL JOURNAL, 2003, 596 (01) :1-8

[9] SPIN-CHANGE CROSS-SECTIONS [J].

DALGARNO, A .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1961, 262 (1308) :132-+

[10] Redshifted 21 centimeter emission from the pre-reionization era. 1. Mean signal and linear fluctuations [J].

Gnedin, NY ;

Shaver, PA .

ASTROPHYSICAL JOURNAL, 2004, 608 (02) :611-621