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 · Sun Jan 01 00:00:00 EST 2017 · Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/153/1/38· OSTI ID:22664061

Meisner, Aaron M. ^[1]; Lang, Dustin ^[2]; Schlegel, David J. ^[3]

Berkeley Center for Cosmological Physics, Berkeley, CA 94720 (United States)
Department of Astronomy and Astrophysics and Dunlap Institute, University of Toronto, Toronto, ON M5S 3H4 (Canada)
Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 (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 μ m and 4.6 μ m relative to the AllWISE release. 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. Much more work still remains in order to fully leverage NEOWISER imaging for astrophysical applications beyond the solar system.

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OSTI ID:: 22664061

Journal Information:: Astronomical Journal (Online), Vol. 153, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881

Country of Publication:: United States

Language:: English

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Title: FULL-DEPTH COADDS OF THE WISE AND FIRST-YEAR NEOWISE-REACTIVATION IMAGES

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