Abstract
We introduce the BOSS Emission-Line Lens Survey (BELLS) GALaxy-Ly$\alpha$
EmitteR sYstems (BELLS GALLERY) Survey, which is a Hubble Space Telescope
program to image a sample of galaxy-scale strong gravitational lens candidate
systems with high-redshift Ly$\alpha$ emitters (LAEs) as the background
sources. The goal of the BELLS GALLERY Survey is to illuminate dark
substructures in galaxy-scale halos by exploiting the small-scale clumpiness of
rest-frame far-UV emission in lensed LAEs, and to thereby constrain the slope
and normalization of the substructure mass function. In this paper, we describe
in detail the spectroscopic strong-lens selection technique, which is based on
methods adopted in the previous Sloan Lens ACS (SLACS) Survey, BOSS
Emission-Line Lens Survey, and SLACS for the Masses Survey. We present the
BELLS GALLERY sample of the 21 highest-quality galaxy-LAE candidates selected
from $1.4 10^6$ galaxy spectra in the Baryon Oscillation
Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey-III (SDSS-III)\@.
These systems consist of massive galaxies at redshifts of approximately 0.5
strongly lensing LAEs at redshifts from 2 to 3. The compact nature of LAEs
makes them an ideal probe of dark substructures, with a substructure-mass
sensitivity that is unprecedented in other optical strong-lens samples. The
magnification effect from lensing will also reveal the structure of LAEs below
100-parsec scales, providing a detailed look at the sites of the most
concentrated unobscured star formation in the universe. The source code used
for candidate selection is available for download as a part of this release.
Users
Please
log in to take part in the discussion (add own reviews or comments).