The multiwavelength Survey by Yale-Chile (MUSYC): Deep medium-band optical imaging and high-quality 32-band photometric redshifts in the ECDF-S

Carolin N. Cardamone, Pieter G. Van Dokkum, C. Megan Urry, Yoshi Taniguchi, Eric Gawiser, Gabriel Brammer, Edward Taylor, Maaike Damen, Ezequiel Treister, Bethany E. Cobb, Nicholas Bond, Kevin Schawinski, Paulina Lira, Takashi Murayama, Tomoki Saito, Kentaro Sumikawa

Research output: Contribution to journalArticlepeer-review

240 Citations (Scopus)

Abstract

We present deep optical 18-medium-band photometry from the Subaru telescope over the ∼30′ × 30′ Extended Chandra Deep Field-South, as part of the Multiwav elength Survey by Yale-Chile (MUSYC). This field has a wealth of ground- and space-based ancillary data, and contains the GOODS-South field and the Hubble Ultra Deep Field. We combine the Subaru imaging with existing UBVRIzJHK and Spitzer IRAC images to create a uniform catalog. Detecting sources in the MUSYC "BVR" image we find ∼40,000 galaxies with RAB < 25.3, the median 5σ limit of the 18 medium bands. Photometric redshifts are determined using the EAzY code and compared to ∼2000 spectroscopic red shifts in this field. The medium-band filters provide very accurate redshifts for the (bright) subset of galaxies with spectroscopic red shifts, particularly at 0.1 < z < 1.2 and at z ≳ 3.5. For 0.1 < z < 1.2, we find a 1σ scatter in Δz/(1 + z) of 0.007, similar to results obtained with a similar filter set in the COSMOS field. As a demonstration of the data quality, we show that the red sequence and blue cloud can be cleanly identified in rest-frame color-magnitude diagrams at 0.1 < z < 1.2. We find that ∼20% of the red sequence galaxies show evidence of dust emission at longer rest-frame wavelengths. The reduced images, photometric catalog, and photometric redshifts are provided through the public MUSYCWeb site.

Original languageEnglish
Pages (from-to)270-285
Number of pages16
JournalAstrophysical Journal, Supplement Series
Volume189
Issue number2
DOIs
Publication statusPublished - 2010 Aug

Keywords

  • Catalogs
  • Cosmology: observations
  • Galaxies: evolution
  • Galaxies: formation
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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