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Searching for Low-redshift Faint Galaxies with MMT/Hectospec

Abstract : We present redshifts for 2753 low-redshift galaxies between 0.03 ≲ zspec ≲ 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. 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
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Submitted on : Friday, May 13, 2022 - 1:31:19 PM
Last modification on : Saturday, June 25, 2022 - 3:17:11 AM

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Cheng Cheng, Jia-Sheng Huang, Christopher N. A. Willmer, Hong-Xin Zhang, Matthew L. N. Ashby, et al.. Searching for Low-redshift Faint Galaxies with MMT/Hectospec. The Astrophysical Journal Supplement Series, 2021, 256, ⟨10.3847/1538-4365/ac17ef⟩. ⟨insu-03667382⟩



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