The DECam Local Volume Exploration Survey Data Release 2

TL;DR

The DELVE DR2 provides an extensive, publicly accessible optical/near-infrared astronomical dataset covering over 21,000 square degrees, with photometry for billions of sources, significantly expanding previous data releases.

Contribution

This release combines new and archival DECam data to deliver the largest and most comprehensive dataset from the DELVE survey to date.

Findings

Coverage of >21,000 deg^2 in four filters

Photometry for ~2.5 billion sources

Four-band data for ~618 million sources

Abstract

We present the second public data release (DR2) from the DECam Local Volume Exploration survey (DELVE). DELVE DR2 combines new DECam observations with archival DECam data from the Dark Energy Survey, the DECam Legacy Survey, and other DECam community programs. DELVE DR2 consists of ~160,000 exposures that cover >21,000 deg^2 of the high Galactic latitude (|b| > 10 deg) sky in four broadband optical/near-infrared filters (g, r, i, z). DELVE DR2 provides point-source and automatic aperture photometry for ~2.5 billion astronomical sources with a median 5{\sigma} point-source depth of g=24.3, r=23.9, i=23.5, and z=22.8 mag. A region of ~17,000 deg^2 has been imaged in all four filters, providing four-band photometric measurements for ~618 million astronomical sources. DELVE DR2 covers more than four times the area of the previous DELVE data release and contains roughly five times as many astronomical objects. DELVE DR2 is publicly available via the NOIRLab Astro Data Lab science platform.