New Synoptic Observations of the Cosmic Optical Background with New Horizons
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866917721407488000 |
|---|---|
| author | Postman, Marc Lauer, Tod R. Parker, Joel W. Spencer, John R. Weaver, Harold A. Shull, J. Michael Stern, S. Alan Brandt, Pontus Conard, Steven J. Gladstone, G. Randall Lisse, Carey M. Porter, Simon D. Singer, Kelsi N. Verbiscer, Anne J. |
| author_facet | Postman, Marc Lauer, Tod R. Parker, Joel W. Spencer, John R. Weaver, Harold A. Shull, J. Michael Stern, S. Alan Brandt, Pontus Conard, Steven J. Gladstone, G. Randall Lisse, Carey M. Porter, Simon D. Singer, Kelsi N. Verbiscer, Anne J. |
| contents | We obtained New Horizons LORRI images to measure the cosmic optical background (COB) intensity integrated over $0.4\lesssimλ\lesssim0.9{~\rmμm}.$ The survey comprises 16 high Galactic-latitude fields selected to minimize scattered diffuse Galactic light (DGL) from the Milky Way galaxy, as well as scattered light from bright stars. This work supersedes an earlier analysis based on observations of one of the present fields. Isolating the COB contribution to the raw total sky levels measured in the fields requires subtracting the remaining scattered light from bright stars and galaxies, intensity from faint stars within the fields fainter than the photometric detection-limit, and the DGL foreground. DGL is estimated from Planck HFI $350 {~\rmμm}$ and $550 {~\rmμm}$ intensities, using a new self-calibrated indicator based on the 16 fields augmented with eight additional DGL calibration fields obtained as part of the survey. The survey yields a highly significant detection ($6.8σ$) of the COB at ${\rm 11.16\pm 1.65~(1.47~sys,~0.75~ran) ~nW ~m^{-2} ~sr^{-1}}$ at the LORRI pivot wavelength of 0.608 $μ$m. The estimated integrated intensity from background galaxies, ${\rm 8.17\pm 1.18 ~nW ~m^{-2} ~sr^{-1}},$ can account for the great majority of this signal. The rest of the COB signal, ${\rm 2.99\pm2.03~ (1.75~sys,~1.03~ran) ~nW ~m^{-2} ~sr^{-1}},$ is formally classified as anomalous intensity but is not significantly different from zero. The simplest interpretation is that the COB is completely due to galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06273 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | New Synoptic Observations of the Cosmic Optical Background with New Horizons Postman, Marc Lauer, Tod R. Parker, Joel W. Spencer, John R. Weaver, Harold A. Shull, J. Michael Stern, S. Alan Brandt, Pontus Conard, Steven J. Gladstone, G. Randall Lisse, Carey M. Porter, Simon D. Singer, Kelsi N. Verbiscer, Anne J. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We obtained New Horizons LORRI images to measure the cosmic optical background (COB) intensity integrated over $0.4\lesssimλ\lesssim0.9{~\rmμm}.$ The survey comprises 16 high Galactic-latitude fields selected to minimize scattered diffuse Galactic light (DGL) from the Milky Way galaxy, as well as scattered light from bright stars. This work supersedes an earlier analysis based on observations of one of the present fields. Isolating the COB contribution to the raw total sky levels measured in the fields requires subtracting the remaining scattered light from bright stars and galaxies, intensity from faint stars within the fields fainter than the photometric detection-limit, and the DGL foreground. DGL is estimated from Planck HFI $350 {~\rmμm}$ and $550 {~\rmμm}$ intensities, using a new self-calibrated indicator based on the 16 fields augmented with eight additional DGL calibration fields obtained as part of the survey. The survey yields a highly significant detection ($6.8σ$) of the COB at ${\rm 11.16\pm 1.65~(1.47~sys,~0.75~ran) ~nW ~m^{-2} ~sr^{-1}}$ at the LORRI pivot wavelength of 0.608 $μ$m. The estimated integrated intensity from background galaxies, ${\rm 8.17\pm 1.18 ~nW ~m^{-2} ~sr^{-1}},$ can account for the great majority of this signal. The rest of the COB signal, ${\rm 2.99\pm2.03~ (1.75~sys,~1.03~ran) ~nW ~m^{-2} ~sr^{-1}},$ is formally classified as anomalous intensity but is not significantly different from zero. The simplest interpretation is that the COB is completely due to galaxies. |
| title | New Synoptic Observations of the Cosmic Optical Background with New Horizons |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2407.06273 |