A Measurement of the Cosmic Optical Background and Diffuse Galactic Light Scaling from the R &lt; 50 AU New Horizons-LORRI Data

Symons, Teresa; Zemcov, Michael; Cooray, Asantha; Lisse, C. M.; Poppe, A. R.

doi:10.48550/arxiv.2212.07449

Cited by 2 publications

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“…This DGL correlation factor at optical and near-infrared wavelengths is derived from many previous works (Arendt et al 1998; (Symons et al 2022). The bandpass of LORRI is also similar to that of the wide-band of ONC-T (Figure 1).…”

Section: Diffuse Galactic Lightsupporting

confidence: 78%

“…(Kashlinsky 2016), decaying hypothetical particles(Kohri et al 2017), nearby black holes observed as faint compact objects(Matsumoto and Tsumura 2019;Matsumoto 2020), and warm-hot intergalactic medium(Zhu and Wang 2023). We adopted EBL(λI λ ) = 21.98 ± 1.83 nW/m 2 /sr at λ = 0.44-0.87 µm observed by LORRI/New Horizons(Symons et al 2022), and this value of EBL is subtracted to obtain the ZL brightness.…”

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confidence: 99%

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Initial Result of Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#

Tsumura

Matsuura

Sano

et al. 2023

Preprint

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The zodiacal light (ZL) is sunlight scattered by interplanetary dust (IPD) in the optical wavelengths. The spatial distribution of IPD in the Solar system may hold an important key to understanding the evolution of the Solar system and material transportation within it. The IPD number density can be expressed as [[EQUATION]] , and the result of [[EQUATION]] was obtained by the previous observations from the interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of [[EQUATION]] based on the ZL observation from the interplanetary space outside the Earth's orbit have been conducted since then. Here we introduce the initial result of the ZL radial profile at optical wavelengths observed at 0.76-1.06 au by ONC-T with Hayabusa2# mission in 2021-2022. The obtained ZL brightness is well reproduced by the model brightness, but there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The obtained radial power-law index is [[EQUATION]] , which is consistent with the previous results based on the ZL observations. The dominant uncertainty source arises from the uncertainty in the Diffuse Galactic Light estimation.

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Section: Diffuse Galactic Lightsupporting

confidence: 78%

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confidence: 99%

Initial Result of Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#

Tsumura

Matsuura

Sano

et al. 2023

Preprint

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“…The CIBER experiments (Matsuura et al 2017;Korngut et al 2022) use the calcium triplet absorption feature in the ZL spectrum to better estimate the intensity of the ZL. The Pioneer (Matsumoto et al 2018) and New Horizons missions (Lauer et al 2021(Lauer et al , 2022Symons et al 2022) leave the inner solar system entirely to heliocentric distances where ZL emission is systematically reduced, providing improvements (>2σ significance) in direct measurements of EBL.…”

Section: Introductionmentioning

confidence: 99%

SKYSURF-4: Panchromatic Hubble Space Telescope All-Sky Surface-brightness Measurement Methods and Results

O'Brien

Carleton

Windhorst

et al. 2023

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The diffuse, unresolved sky provides most of the photons that the Hubble Space Telescope (HST) receives, yet remains poorly understood. The HST Archival Legacy program SKYSURF aims to measure the 0.2–1.6 μm sky surface brightness (sky-SB) from over 140,000 HST images. We describe a sky-SB measurement algorithm designed for SKYSURF that is able to recover the input sky-SB from simulated images to within 1% uncertainty. We present our sky-SB measurements estimated using this algorithm on the entire SKYSURF database. Comparing our sky-SB spectral energy distribution (SED) to measurements from the literature shows general agreements. Our SKYSURF SED also reveals a possible dependence on the Sun angle, indicating either nonisotropic scattering of solar photons off interplanetary dust or an additional component to zodiacal light. Finally, we update the diffuse light limits in the near-IR based on the methods from Carleton et al., with values of 0.009 MJy sr−1 (22 nW m−2 sr−1) at 1.25 μm, 0.015 MJy sr−1 (32 nW m−2 sr−1) at 1.4 μm, and 0.013 MJy sr−1 (25 nW m−2 sr−1) at 1.6 μm. These estimates provide the most stringent all-sky constraints to date in this wavelength range. SKYSURF sky-SB measurements are made public on the official SKYSURF website and will be used to constrain diffuse light in future papers.

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A Measurement of the Cosmic Optical Background and Diffuse Galactic Light Scaling from the R < 50 AU New Horizons-LORRI Data

Cited by 2 publications

References 0 publications

Initial Result of Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#

Initial Result of Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#

SKYSURF-4: Panchromatic Hubble Space Telescope All-Sky Surface-brightness Measurement Methods and Results

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