Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..211f&link_type=abstract
Spitzer Proposal ID #211
Physics
Scientific paper
IRAC Imaging of a Cluster of Galaxies at z=2.39 and Extremely Red Objects Myungshin Im (SSC) Mark Lacy (SSC) Abstract: This program is a deep IRAC imaging of a field near a known z=2.4 radio galaxy, 53W002. This field is also known to contain a proto-cluster of galaxies at z=2.4 (Windhorst et al. 1998, ApJ), and has been observed deeply in B,V,I,J, and H by HST, and in J and K by Subaru. Recent studies have revealed a number of z=2.4 galaxy candidates, and Extremely Red Objects (EROs) in this field. Two of the EROs are J-band dropouts, which could be either dusty/old galaxies at z ≃ 2.4 or Lyman break galaxies at z ≃ 12.5. With our IRAC imaging data, we will study: (1) The nature of J-band dropouts: deep IRAC ch1 and ch2 images will provide a strong indiciation whether the J-band dropouts are at z ~ 2 or at z ~ 12.5. If they are at z ~ 12.5, they will have a flux of about 1.5 microJy in ch1 and ch2. If they are at z ~ 2, they will have a flux of about 3 microJy or more; (2) The nature of EROs: we will study the spectral energy distribution of EROs, to estimate their redshifts and to study their stellar population; (3) Photometric redshift of galaxies in the field; we will use photometric redshift techniques to estimate redshifts of galaxies in the field. If this field indeed covers a z=2.4 cluster of galaxies as claimed, we expect to discover a large number of galaxies which show a SED peak at 5.5 micron (= redshifted 1.6 micron stellar emission peak). (4) Stellar population of galaxies: We will study stellar population of the spectroscopically confirmed z=2.4 galaxies. The IRAC bands corresponds to redshfited NIR wavelengths for such galaxies, thus will be useful for setting a stronger constraint on their stellar mass and star formation history.
Fazio Giovanni
Huang Jiasheng
Im Myungshin
Lacy Mark
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