Anomalous Flux in the Cosmic Optical Background Detected with New Horizons Observations

被引：41

作者：

Lauer, Tod R. ^{[1
]}

Postman, Marc ^{[2
]}

Spencer, John R. ^{[3
]}

Weaver, Harold A. ^{[4
]}

Stern, S. Alan ^{[5
]}

Gladstone, G. Randall ^{[6
,7
]}

Binzel, Richard P. ^{[8
]}

Britt, Daniel T. ^{[9
]}

Buie, Marc W. ^{[3
]}

Buratti, Bonnie J. ^{[10
]}

Cheng, Andrew F. ^{[4
]}

Grundy, W. M. ^{[11
]}

Horanyi, Mihaly ^{[12
]}

Kavelaars, J. J. ^{[13
,14
]}

Linscott, Ivan R.

Lisse, Carey M. ^{[4
]}

McKinnon, William B. ^{[15
,16
]}

McNutt, Ralph L. ^{[4
]}

Moore, Jeffrey M. ^{[17
]}

Nunez, J., I ^{[4
]}

Olkin, Catherine B. ^{[3
]}

Parker, Joel W. ^{[3
]}

Porter, Simon B. ^{[3
]}

Reuter, Dennis C. ^{[18
]}

Robbins, Stuart J. ^{[3
]}

Schenk, Paul M. ^{[19
]}

Showalter, Mark R. ^{[20
]}

Singer, Kelsi N. ^{[3
]}

Verbiscer, Anne J. ^{[21
]}

Young, Leslie A. ^{[3
]}

机构：

[1] NSFs Natl Opt Infrared Astron Res Lab, POB 26732, Tucson, AZ 85726 USA

[2] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[3] Southwest Res Inst, Dept Space Studies, 1050 Walnut St,Suite 300, Boulder, CO 80302 USA

[4] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[5] Southwest Res Inst, Space Sci & Engn Div, 1050 Walnut St,Suite 300, Boulder, CO 80302 USA

[6] Southwest Res Inst, San Antonio, TX 78238 USA

[7] Univ Texas San Antonio, San Antonio, TX 78249 USA

[8] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[9] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA

[10] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[11] Lowell Observ, Flagstaff, AZ 86001 USA

[12] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

[13] Natl Res Council Canada, Victoria, BC, Canada

[14] Univ Victoria, Dept Phys & Astron, Victoria, BC, Canada

[15] Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA

[16] Washington Univ, McDonnell Ctr Space Sci, St Louis, MO 63130 USA

[17] NASA, Space Sci Div, Ames Res Ctr, Moffett Field, CA 94035 USA

[18] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[19] Lunar & Planetary Inst, 3303 NASA Rd 1, Houston, TX 77058 USA

[20] SETI Inst, Mountain View, CA 94043 USA

[21] Univ Virginia, Charlottesville, VA 22904 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2022年 / 927卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

RANGE RECONNAISSANCE IMAGER; LIGHT; DEEP; TRILEGAL; SPECTRA; BLAZARS; ASTROPY;

D O I：

10.3847/2041-8213/ac573d

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We used New Horizons LORRI images to measure the optical-band (0.4 less than or similar to lambda less than or similar to 0.9 mu m) sky brightness within a high-galactic-latitude field selected to have reduced diffuse scattered light from the Milky Way galaxy (DGL), as inferred from the IRIS all-sky 100 mu m map. We also selected the field to significantly reduce the scattered light from bright stars (SSL) outside the LORRI field. Suppression of DGL and SSL reduced the large uncertainties in the background flux levels present in our earlier New Horizons cosmic optical background (COB) results. The raw total sky level, measured when New Horizons was 51.3 au from the Sun, is 24.22 +/- 0.80 nW m(-2) sr(-1). Isolating the COB contribution to the raw total required subtracting scattered light from bright stars and galaxies, faint stars below the photometric detection limit within the field, and the hydrogen plus ionized-helium two-photon continua. This yielded a highly significant detection of the COB at 16.37 +/- 1.47 nW m(-2) sr(-1) at the LORRI pivot wavelength of 0.608 mu m. This result is in strong tension with the hypothesis that the COB only comprises the integrated light of external galaxies (IGL) presently known from deep HST counts. Subtraction of the estimated IGL flux from the total COB level leaves a flux component of unknown origin at 8.06 +/- 1.92 nW m(-2) sr(-1). Its amplitude is equal to the IGL.

引用

页数：10

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