Full-Depth Coadds of the WISE and First-Year NEOWISE-Reactivation Images

Meisner, Aaron M.; Lang, Dustin; Schlegel, David J.

doi:10.3847/1538-3881/153/1/38

Title: Full-Depth Coadds of the WISE and First-Year NEOWISE-Reactivation Images

Journal Article · Tue Jan 03 00:00:00 EST 2017 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/153/1/38· OSTI ID:1379624

Meisner, Aaron M. ^[1];

^[2];

^[3]

Berkeley Center for Cosmological Physics, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Toronto, ON (Canada); Univ. of Waterloo, ON (Canada)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The Near Earth Object Wide-field Infrared Survey Explorer (NEOWISE) Reactivation mission released data from its first full year of observations in 2015. This data set includes ~2.5 million exposures in each of W1 and W2, effectively doubling the amount of WISE imaging available at 3.4 μm and 4.6 μm relative to the AllWISE release. In this paper, we have created the first ever full-sky set of coadds combining all publicly available W1 and W2 exposures from both the AllWISE and NEOWISE-Reactivation (NEOWISER) mission phases. We employ an adaptation of the unWISE image coaddition framework, which preserves the native WISE angular resolution and is optimized for forced photometry. By incorporating two additional scans of the entire sky, we not only improve the W1/W2 depths, but also largely eliminate time-dependent artifacts such as off-axis scattered moonlight. We anticipate that our new coadds will have a broad range of applications, including target selection for upcoming spectroscopic cosmology surveys, identification of distant/massive galaxy clusters, and discovery of high-redshift quasars. In particular, our full-depth AllWISE+NEOWISER coadds will be an important input for the Dark Energy Spectroscopic Instrument selection of luminous red galaxy and quasar targets. Our full-depth W1/W2 coadds are already in use within the DECam Legacy Survey (DECaLS) and Mayall z-band Legacy Survey (MzLS) reduction pipelines. Finally, much more work still remains in order to fully leverage NEOWISER imaging for astrophysical applications beyond the solar system.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; AST-0950945

OSTI ID:: 1379624

Journal Information:: The Astronomical Journal (Online), Vol. 153, Issue 1; ISSN 1538-3881

Publisher:: IOP Publishing - AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 60 works

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References (10)

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Title: Full-Depth Coadds of the WISE and First-Year NEOWISE-Reactivation Images

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