Searching for Low-redshift Faint Galaxies with MMT/Hectospec

Cheng Cheng, Jia Sheng Huang, Christopher N.A. Willmer, Hong Xin Zhang, Matthew L.N. Ashby, Hai Xu, Marcin Sawicki, Stephane Arnouts, Stephen Gwyn, Guilllaume Desprez, Jean Coupon, Anneya Golob, Piaoran Liang, Tianwen Cao, Yaru Shi, Gaoxiang Jin, Chuan He, Shumei Wu, Zijian Li, Y. Sophia DaiC. Kevin Xu, Xu Shao, Marat Musin

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We present redshifts for 2753 low-redshift galaxies between 0.03 ≲ z spec ≲ 0.5 with 18 ≤ r ≤ 22 obtained with Hectospec at the Multi-Mirror Telescope. The observations targeted the XMM-LSS, ELAIS-N1 and DEEP2-3 fields, each of which covers ∼1 deg2. These fields are also part of the recently completed Canada-France-Hawaii Telescope Large Area U-band Deep Survey and ongoing Hyper Suprime-Cam deep fields surveys. The efficiency of our technique for selecting low-redshift galaxies is confirmed by the redshift distribution of our sources. In addition to redshifts, these high signal-to-noise ratio spectra are used to measure ages, metallicities, and nuclear activity levels. In combination with the photometric catalog in u, g, r, i, z, y down to 27 AB mag, we are able to study the galaxy population down to stellar masses of ∼108 M o˙. This paper presents the observational strategy, the reduction procedure and properties of the galaxy sample. (The catalog can be accessed through the survey's website at∼cnaw/Faint_Low_z/.)

Original languageEnglish (US)
Article number4
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Sep 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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