MAMMOTH: Confirmation of two massive galaxy overdensities at z = 2.24 with Hα emitters
Loading...
Date
2021
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
Massive galaxy overdensities at the peak epoch of cosmic star formation provide ideal testbeds for the formation theories of galaxies and large-scale structure. We report the confirmation of two massive galaxy overdensities at z = 2.24, BOSS1244 and BOSS1542, selected from the Mapping the Most Massive Overdensities Through Hydrogen (MAMMOTH) project using Lyα absorption from the intergalactic medium over the scales of 15-30 h-1 Mpc imprinted on the quasar spectra. We use Hα emitters (HAEs) as the density tracer and identify them using deep narrow-band H2S(1) and broad-band Ks imaging data obtained with the wide-field infrared camera (WIRCam) at the Canada-France-Hawaii Telescope. In total, 244 and 223 line emitters are detected in these two fields, and 196 ± 2 and 175 ± 2 are expected to be HAEs with an Hα flux of >2.5 × 10-17 erg s-1 cm-2 (corresponding to a star formation rate of >5 M· yr-1). The detection rate of HAE candidates suggests an overdensity factor of δgal = 5.6 ± 0.3 and 4.9 ± 0.3 over the volume of 54 × 32 × 32 co-moving Mpc3.
Description
Keywords
Galaxies: clusters, Galaxies: star formation, Galaxies: high-redshift, Quasars: absorption lines, BOSS1244
Citation
An, F.X. et al. (2021). MAMMOTH: Confirmation of two massive galaxy overdensities at z = 2.24 with Hα emitters. Monthly Notices of the Royal Astronomical Society, 500(4), 4354-4364