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24 April 2024 |
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An overdensity of galaxies at z=5.9 +/-0.2 in the Ultra Deep Field confirmed using the ACS grism | | S. Malhotra
; J.E. Rhoads
; N. Pirzkal
; Z. Haiman
; C. Xu
; E. Daddi
; H. Yan
; L.E. Bergeron
; J. Wang
; H.A. Ferguson
; A. Koekemoer
; L. A. Moustakas
; N. Panagia
; M. Stiavelli
; J. Walsh
; R. A. Windhorst
; A. Pasquali
; C. Gronwall
; M. Kuemmel
; S. di Serego Alighieri
; | | Date: |
24 Dec 2004 | | Journal: | Astrophys.J. 626 (2005) 666-679 | | Subject: | astro-ph | | Abstract: | We present grism spectra taken with the Advanced Camera for Surveys to identify 29 red sources with (i’-z’) > 0.9 in the Hubble Ultra Deep Field (HUDF). Of these 23 are found to be galaxies at redshifts between z=5.4 and 6.7, identified by the break at 1216 angstrom due to IGM absorption; two are late type dwarf stars with red colors; and four are galaxies with colors and spectral shape similar to dust reddened or old galaxies at redshifts z~1-2. This constitutes the largest uniform, flux-limited sample of spectroscopically confirmed galaxies at such faint fluxes z’<27.5. Many are also among the most distant spectroscopically confirmed galaxies (at redshifts up to z=6.7). We find a significant overdensity of galaxies at redshifts z=5.9 +/- 0.2. Nearly two thirds of the galaxies in our sample (15/23) belong to this peak. Taking into account the selection function and the redshift sensitivity of the survey, we get a conservative overdensity of at least a factor of two along the line-of-sight. The galaxies found in this redshift peak are also localized in the plane of the sky in a non-random manner, occupying about half of the ACS chip. Thus the volume overdensity is a factor of four. The star-formation rate derived from detected sources in this overdense region is sufficient to reionize the local IGM. | | Source: | arXiv, astro-ph/0501478 | | Services: | Forum | Review | PDF | Favorites | |
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