Physics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..289k&link_type=abstract
In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A
Physics
Galaxies: Formation, Submillimeter, Molecules
Scientific paper
We study the prospects for observing H2 and HD emission during the assembly of primordial molecular cloud cores. The primordial molecular cloud cores, which resemble those at the present epoch, can emerge around 1 + z ~ 20 according to recent numerical simulations. A core typically contracts to form the first generation of stars and the contracting core emits H2 and HD line radiation. These lines show a double-peak feature. The higher peak is the H2 line of the J = 2-0 (v = 0) rotational transition, and the lower peak is the HD line of the J = 4-3 (v = 0) rotational transition. The ratio of the peaks is about 20, this value characterizing the emission from primordial galaxies. While an individual object is not observable even by ALMA, the expected assembly of primordial star clusters on subgalactic scales can result in fluxes at the 2000-50 μJy level. These are marginally observable.
Kamaya Hideyuki
Silk Joseph
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