Semantic Scholar Open Access 2001 12 sitasi

On the possibility of observing H2 emission from primordial molecular cloud kernels

H. Kamaya J. Silk

Lihat Sumber DOI

Abstrak

We study the prospects for observing H2 emission during the assembly of primordial molecular cloud kernels. The primordial molecular cloud cores, which resemble those at the present epoch, can emerge around 1þ z , 20 according to recent numerical simulations. The kernels form inside the cores, and the first stars will appear inside the kernels. A kernel typically contracts to form one of the first generation stars with an accretion rate that is as large as ,0.01 M( yr. This occurs owing to the primordial abundances, which result in a kernel temperature of order 1000 K, and the collapsing kernel emits H2 line radiation at a rate ,10 erg s. Predominantly J 1⁄4 5 2 3 ðv 1⁄4 0Þ rotational emission of H2 is expected. At redshift 1þ z , 20, the expected flux is ,0.01mJy for a single kernel. While an individual object is not observable by any facilities available in the near future, the expected assembly of primordial star clusters on subgalactic scales can result in fluxes at the sub-mJy level. This is marginally observable with ASTRO-F and ALMA. We also examine the rotational J 1⁄4 2 2 0 ðv 1⁄4 0Þ and vibrational dv 1⁄4 1 emission lines. The former may possibly be detectable with

Topik & Kata Kunci

Physics

Penulis (2)

H. Kamaya

J. Silk

Format Sitasi

APA MLA BibTeX

Kamaya, H., Silk, J. (2001). On the possibility of observing H2 emission from primordial molecular cloud kernels. https://doi.org/10.1046/j.1365-8711.2002.05301.x

Akses Cepat

Lihat di Sumber doi.org/10.1046/j.1365-8711.2002.05301.x

Informasi Jurnal

Tahun Terbit: 2001
Bahasa: en
Total Sitasi: 12×
Sumber Database: Semantic Scholar
DOI: 10.1046/j.1365-8711.2002.05301.x
Akses: Open Access ✓