Computer Science
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf..143m&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Computer Science
Scientific paper
Quasar absorption systems provide us useful information about very faint objects that we cannot detect directly. For example, metal absorption systems are generally provided by star formation activities, and the existence of them is powerful evidence of there being nearby galaxies. Among metal absorption systems, C IV systems have been well studied. The number density of them per unit redshift range, N(z), had been already known to decrease with increasing redshift for z < 3.6 (Steidel. 1990). We newly confirmed this decreasing trend continued up to z ~ 4.5 with our 18 spectra of z ~ 4 quasars. The reason of the decrease has been argued, but it is still not clear. One of the most severe problems is that the origin of metal absorption lines has not been revealed. We carried out deep near-infrared narrow-band imaging using SUBARU telescope. The target is the field around Q2343+125, which is one of the pair quasars and ~1 Mpc distant from the companion quasar, Q2344+125. These quasars have common C IV absorption systems at the same redshift z=2.43 on each spectra. We will talk our preliminary result.
Iye Masanori
Kashikawa Nobunari
Misawa Toru
Ohyama Youichi
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