The Intermediate-Band Dropout Method: A New Method to Search for High-Redshift Galaxies

We propose a new method to search for high-redshift galaxies that is based on an intermediate-band dropout technique rather than the usual broad-band dropout one. In this method, we use an intermediate-band filter whose central wavelength is longer than 7000 Å. This new method makes it possible to d...

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Published inPublications of the Astronomical Society of Japan Vol. 57; no. 2; pp. 287 - 293
Main Authors Shioya, Yasuhiro, Taniguchi, Yoshiaki, Ajiki, Masaru, Nagao, Tohru, Murayama, Takashi, Sasaki, Shunji, Sumiya, Ryoko, Hatakeyama, Yuichiro
Format Journal Article
LanguageEnglish
Published Oxford, UK Oxford University Press 25.04.2005
Subjects
early universe
galaxies: formation
cosmology: observations
galaxies: evolution
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Summary:We propose a new method to search for high-redshift galaxies that is based on an intermediate-band dropout technique rather than the usual broad-band dropout one. In this method, we use an intermediate-band filter whose central wavelength is longer than 7000 Å. This new method makes it possible to distinguish both very late-type stars, such as L and T dwarfs, and dusty galaxies at intermediate redshifts from real high- $z$ Lyman break galaxies. The reason for this is that such interlopers do not show strong intermediate-band depression, although they have very red broad-band colors that are indicative of Lyman break galaxies (LBGs). Applying our new method to imaging data sets obtained with Suprime-Cam on the Subaru Telescope, we found a new sample of Lyman break galaxies at $z \simeq 5$ .
ISSN:0004-6264
2053-051X
DOI:10.1093/pasj/57.2.287