LESSER: A Catalogue of Spectroscopically selected sample of Lyman-$\alpha$ Emitters Lensed By Galaxies

TL;DR

The LESSER project compiles a catalog of 361 candidate lensed Lyman-$ m Ly ext{-} m ext{ extbackslash alpha}$ Emitters (LAEs) identified in eBOSS, revealing diverse $ m Ly ext{-} m ext{ extbackslash alpha}$ line profiles for studying dark matter and galaxy evolution.

Contribution

This paper presents the first large catalog of spectroscopically selected lensed LAEs from eBOSS, including detailed spectral features and potential for future follow-up studies.

Findings

Catalog contains 361 candidate lensing systems.

Majority of systems show single-peaked $ m Ly ext{-} m ext{ extbackslash alpha}$ emission lines.

Some systems exhibit double-peaked $ m Ly ext{-} m ext{ extbackslash alpha}$ lines.

Abstract

We introduce the LEnSed laeS in the Eboss suRvey (LESSER) project, which aims to search for lensed Lyman-$\alpha$ Emitters (LAEs) in the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). The final catalog contains 361 candidate lensing systems. The lens galaxies are luminous red galaxies (LRGs) at redshift $0.4 < z < 0.8$, and the source galaxies are LAEs at redshift $2 < z < 3$. The spectral resolution of eBOSS ($\sim$2000) allows us to further identify the fine structures of Lyman-$\alpha$ ($\rm Ly\alpha$) emissions. Among our lensed LAE candidates, 281 systems present single-peaked line profiles while 80 systems show double-peaked features. Future spectroscopic/imaging follow-up observations of the catalog may shed light on the origin of diverse $\rm Ly\alpha$ line morphology, and provide promising labs for studying low mass dark matter haloes/subhaloes.