Searching for low-redshift faint galaxies with MMT/Hectospec. (arXiv:2107.11682v2 [astro-ph.GA] UPDATED)

Searching for low-redshift faint galaxies with MMT/Hectospec. (arXiv:2107.11682v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Cheng_C/0/1/0/all/0/1">Cheng Cheng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Huang_J/0/1/0/all/0/1">Jia-Sheng Huang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Willmer_C/0/1/0/all/0/1">Christopher N. A. Willmer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_H/0/1/0/all/0/1">Hong-Xin Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ashby_M/0/1/0/all/0/1">Matthew L. N. Ashby</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Xu_H/0/1/0/all/0/1">Hai Xu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liang_P/0/1/0/all/0/1">Piaoran Liang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cao_T/0/1/0/all/0/1">Tianwen Cao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shi_Y/0/1/0/all/0/1">Yaru Shi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jin_G/0/1/0/all/0/1">Gaoxiang Jin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+He_C/0/1/0/all/0/1">Chuan He</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wu_S/0/1/0/all/0/1">Shumei Wu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_Z/0/1/0/all/0/1">Zijian Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dai_Y/0/1/0/all/0/1">Y. Sophia Dai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Xu_C/0/1/0/all/0/1">C. Kevin Xu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shao_X/0/1/0/all/0/1">Xu Shao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Musin_M/0/1/0/all/0/1">Marat Musin</a>

We present redshifts for 2753 low-redshift galaxies between $0.03 lesssim
z_{rm spec}lesssim0.5$ with 18 $leq$ $r$ $leq$ 22 obtained with Hectospec
at the Multi-Mirror Telescope (MMT). The observations targeted the XMM-LSS,
ELAIS-N1 and DEEP2-3 fields, each of which covers $sim$ 1 deg$^2$. These
fields are also part of the recently completed CFHT Large Area U-band Deep
Survey (CLAUDS) and on-going 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
S/N spectra are used to measure ages, metallicities, and nuclear activity
levels. In combination with the photometric catalogue 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 $sim$ 10$^8 M_odot$ . This paper presents the observational
strategy, the reduction procedure and properties of the galaxy sample.

http://arxiv.org/icons/sfx.gif