<i>AKARI</i>OBSERVATION OF THE SUB-DEGREE SCALE FLUCTUATION OF THE NEAR-INFRARED BACKGROUND

Seo, Hyunjong; Lee, Hyung Mok; Matsumoto, Toshio; Jeong, Woong Seob; Lee, Myung Gyoon; Pyo, Jeonghyun

doi:10.1088/0004-637x/807/2/140

Cited by 27 publications

(35 citation statements)

References 51 publications

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“…Seo et al (2015) (S15 hereafter) carried out a similar measurement in a larger region around the NEP reaching angular scales of 35 ′ and removing sources down to ∼ 22 magnitude. Both studies detected fluctuations at large scales and claimed they could not be from faint galaxies or other Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…The panel in the lower right corner shows the normalized power spectrum of the PSF. The data points are from the PSF determination in Seo et al (2015) at 2.4µm (blue) and 3.2µm (red) which we have fitted with an exponential profile (black line). The dashed line shows the Spitzer/IRAC PSF (ch1).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, M11 argued that the spectral energy distribution (SED) of this excess signal was a steep Rayleigh-Jeans type spectrum, consistent with hot PopIIIlike objects. Figure 1 shows the power spectra measured by AKARI (Matsumoto et al 2011;Seo et al 2015) 1 and a twocomponent noise model fitted to them. A shot noise-like component, PSN, is suppressed by the PSF on small scales, while an instrument noise-like component, PIN, is unaffected by the PSF.…”

Section: Introductionmentioning

confidence: 99%

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AKARI near-infrared background fluctuations arise from normal galaxy populations

Helgason

Komatsu

2016

Monthly Notices of the Royal Astronomical Society: Letters

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We show that measurements of the fluctuations in the near-infrared background (NIRB) from the AKARI satellite can be explained by faint galaxy populations at low redshifts. We demonstrate this using reconstructed images from deep galaxy catalogs (HUGS/S-CANDELS) and two independent galaxy population models. In all cases, we find that the NIRB fluctuations measured by AKARI are consistent with faint galaxies and there is no need for a contribution from unknown populations. We find no evidence for a steep Rayleigh-Jeans spectrum for the underlying sources as previously reported. The apparent Rayleigh-Jeans spectrum at large angular scales is likely a consequence of galaxies being removed systematically to deeper levels in the longer wavelength channels.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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AKARI near-infrared background fluctuations arise from normal galaxy populations

Helgason

Komatsu

2016

Monthly Notices of the Royal Astronomical Society: Letters

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“…In addition, intrahalo light (IHL; Cooray et al 2012) and first stars in the early universe are also candidates. Seo et al (2015) investigated spatial structures in the NEP deep field using mosaicked images in the bottom panel of Figure 1. They extended the fluctuation analysis to angular scales up to 1000 , which could provide useful constraints for the study of the background at near-infrared wavelengths.…”

Section: Discussionmentioning

confidence: 99%

Akari Observations of the Fluctuations of the Near-Infrared Background Ii

Seo¹,

Lee²,

Matsumoto³

et al. 2017

Publications of The Korean Astronomical Society

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We report a spatial fluctuation analysis of the sky brightness in the near-infrared from observations towards the north ecliptic pole (NEP) by AKARI at 2.4 and 3.2 µm. As a follow up study of our previous work on the Monitor field of AKARI, we used NEP deep survey data, which covered a circular area of about 0.4 square degrees, in order to extend fluctuation analysis at angular scales up to 1000 . After pre-processing, additional correction procedures were done to correct time varying components and instrumental effects such as MUXbleed. To remove resolved objects, we applied 2σ clipping and point spread function (PSF) subtraction. We finally obtained mosaicked images which can be used for the study of various diffuse emissions in the near-infrared sky and found that there are spatial structures in the mosaicked images using a power spectrum analysis.

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“…λI λ ∼ λ −3 ). Using a wider field AKARI image, Seo et al (2015) found the existence of excess power up to ∼ 0.3 • . At 1.1 and 1.6 µm, the Cosmic Infrared Background ExpeRiment (CIBER) measured large angular scale (< 1 • ) fluctuations (Zemcov et al 2014).…”

Section: Introductionmentioning

confidence: 98%

Large angular scale fluctuations of near-infrared extragalactic background light based on the IRTS observations

Kim

Matsumoto

Lee

et al. 2019

Publications of the Astronomical Society of Japan

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Abstract We measure the spatial fluctuations of the Near-Infrared Extragalactic Background Light (NIREBL) from 2° to 20° in angular scale at the 1.6 and $2.2\, \mu \mathrm{m}$ using data obtained with Near-Infrared Spectrometer (NIRS) on board the Infrared Telescope in Space (IRTS). The brightness of the NIREBL is estimated by subtracting foreground components such as zodiacal light, diffuse Galactic light, and integrated star light from the observed sky. The foreground components are estimated using well-established models and archive data. The NIREBL fluctuations for the 1.6 and $2.2\, \mu \mathrm{m}$ connect well toward the sub-degree scale measurements from previous studies. Overall, the fluctuations show a wide bump with a center at around 1° and the power decreases toward larger angular scales with nearly a single power-law spectrum (i.e., ${F[\sqrt{l(l+1)C_l/2\pi }]} \sim \theta ^{-1}]$, indicating that the large-scale power is dominated by the random spatial distribution of the sources. After examining several known sources, contributors such as normal galaxies, high-redshift objects, intra-halo light, and far-IR cosmic background, we conclude that the excess fluctuation at around the 1° scale cannot be explained by any of them.

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AKARIOBSERVATION OF THE SUB-DEGREE SCALE FLUCTUATION OF THE NEAR-INFRARED BACKGROUND

Cited by 27 publications

References 51 publications

AKARI near-infrared background fluctuations arise from normal galaxy populations

AKARI near-infrared background fluctuations arise from normal galaxy populations

Akari Observations of the Fluctuations of the Near-Infrared Background Ii

Large angular scale fluctuations of near-infrared extragalactic background light based on the IRTS observations

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