Spitzer Observations of the North Ecliptic Pole

Abstract

We present a photometric catalog for Spitzer Space Telescope warm mission observations of the North Ecliptic Pole (NEP; centered at R.A. = 18 h 00 m 00 s , decl. = 66 d 33 m 38 552). The observations are conducted with IRAC in the 3.6 and 4.5 μm bands over an area of 7.04 deg 2 , reaching 1σ depths of 1.29 μJy and 0.79 μJy in the 3.6 μm and 4.5 μm bands, respectively. The photometric catalog contains 380,858 sources with 3.6 and 4.5 μm band photometry over the full-depth NEP mosaic. Point-source completeness simulations show that the catalog is 80% complete down to 19.7 AB. The accompanying catalog can be used for constraining the physical properties of extragalactic objects, studying the AGN population, measuring the infrared colors of stellar objects, and studying the extragalactic infrared background light.

NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-μm map and catalogue of 850-μm-selected sources over 2 deg2

“…Spitzer /MIPS 24-µm imaging data are available for central 1 deg 2 , yet the sensitivity is also limited. Therefore we decided to mainly rely on the publicly available Spitzer /IRAC 3.6-and 4.5µm imaging data (Nayyeri et al 2018, PSF size approximately 1 arcsec) for the SMG counterpart identification. The [3.6−4.5] colour is used to construct a parameter distribution for SMGs.…”

“…Multi-wavelength data over more than 4 deg 2 around the NEP have been accumulated, mostly based on the legacy survey of the infrared telescope AKARI (Matsuhara et al 2006). The available data sets include observations covering UV, optical, mid-and far-IR, and radio wavelengths (e.g., Hwang et al 2007;White et al 2010;Pearson et al 2012;Takagi et al 2012;Oi et al 2014;Nayyeri et al 2018, Oi et al 2020Kim et al 2020, in prep. ), while there are still a number of upcoming space-based surveys that have marked this region as one of the most advantageous fields for addressing multi-wavelength galaxy evolution.…”

Infrared luminosity functions based on 18 mid-infrared bands: revealing cosmic star formation history with AKARI and Hyper Suprime-Cam

“…In addition to the AKARI's 9 mid-IR bands, in the AKARI NEP field, there exit archival deep Spitzer (IRAC1,2,3,4 and MIPS24, Nayyeri et al 2018) and WISE (W 1, W 2, W 3, and W 4) images as well. By combining all available mid-IR bands, in total we used 18 mid-IR bands, which are one of the most comprehensive mid-IR data sets for thousands of galaxies.…”

Search for Optically Dark Infrared Galaxies without Counterparts of Subaru Hyper Suprime-Cam in the AKARI North Ecliptic Pole Wide Survey Field

“…For MIR data, we used a catalog of Nayyeri et al (2018) who provided 3.6 µm (ch1) and 4.5 µm (ch2) data taken with Infrared Array Camera (IRAC: Fazio et al 2004) on board the Spitzer Space Telescope (Werner et al 2004). This photometric catalog contains 380,858 sources with a 5σ detection limit of 6.45 and 3.95 µJy in the 3.6 µm and 4.5 µm bands, respectively.…”

“…The footprint of each observation. Red, orange, and yellow shaded regions represent AKARI NEP-W(Kim et al 2012), NEP-D(Murata et al 2013), and IRAC/Spitzer(Nayyeri et al 2018), respectively. Blue, green, black, and magenta line represent HSC/Subaru(Oi et al 2020), FLAMINGOS/KPNO(Jeon et al 2014), PACS/Herschel(Pearson et al 2019), and SPIRE/Herschel(Pearson et al 2017, C. Pearson in preparation), respectively.…”