The Spitzer Coverage of HSC-Deep with IRAC for Z studies (SHIRAZ). I. IRAC Mosaics

Marianna Annunziatella, Anna Sajina, Mauro Stefanon, Danilo Marchesini, Mark Lacy, Ivo Labbé, Lilianna Houston, Rachel Bezanson, Eiichi Egami, Xiaohui Fan, Duncan Farrah, Jenny Greene, Andy Goulding, Yen Ting Lin, Xin Liu, Thibaud Moutard, Yoshiaki Ono, Masami Ouchi, Marcin Sawicki, Jason SuraceKatherine Whitaker

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We present new Spitzer Infrared Array Camera (IRAC) 3.6 and 4.5 μm mosaics of three fields, E-COSMOS, DEEP2-F3, and ELAIS-N1. Our mosaics include both new IRAC observations as well as reprocessed archival data in these fields. These fields are part of the HSC-Deep grizy survey and have a wealth of additional ancillary data. The addition of these new IRAC mosaics is critical in allowing for improved photometric redshifts and stellar population parameters at cosmic noon and earlier epochs. The total area mapped by this work is ∼17 deg2 with a mean integration time of ≈1200s, providing a median 5σ depth of 23.7(23.3) at 3.6(4.5) μm in AB. We perform SExtractor photometry both on the combined mosaics as well as the single-epoch mosaics taken ≈6 months apart. The resultant IRAC number counts show good agreement with previous studies. In combination with the wealth of existing and upcoming spectrophotometric data in these fields, our IRAC mosaics will enable a wide range of galactic evolution and AGN studies. With that goal in mind, we make the combined IRAC mosaics and coverage maps of these three fields publicly available.

Original languageEnglish (US)
Article number25
JournalAstronomical Journal
Issue number1
StatePublished - Jul 1 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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