The High‐Resolution Light‐polluted Night‐Sky Spectrum at Mount Hamilton, California

Slanger, T. G.; Cosby, P. C.; Osterbrock, Donald E.; Stone, R. P. S.; Misch, A.

doi:10.1086/376391

Cited by 14 publications

(17 citation statements)

References 19 publications

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“…Twilight emission of this line was also detected from Calcutta observatory by Bhaumik et al [10]. Strong atomic line of Li was observed by Slanger et al [11] at San Jose from the Lick observatory. The proposed excitation mechanism [12] of lithium airglow line indicates that the intensity of Li 6708 Å line is affected by the variation of ozone concentration.…”

Section: Introductionsupporting

confidence: 54%

Long-term ozone trend and its effect on night airglow intensity of Li 6708 Å at Ahmedabad (23°N, 72.5°E), India and Halley Bay (76°S, 27°W), British Antarctic Service Station

et al. 2010

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A critical analysis has been made of the long-term yearly and seasonal variations of ozone concentration at Ahmedabad (23°N, 72.5°E), India and Halley Bay (76°S, 27°W), a British Antarctic Service Station. The effect of O 3 depletion on night airglow emission of Li 6708 Å line at Ahmedabad and Halley Bay has been studied. Calculations based on chemical kinetics show that the airglow intensity of Li 6708 Å line has also been affected due to the depletion of O 3 concentration. The nature of yearly variation and seasonal variation of intensity of Li 6708 Å line for the above two stations have been shown and compared. It has been shown that the rate of decrease of intensity of Li 6708 Å line was comparatively higher at Halley Bay due to dramatic decrease of Antarctic O 3 concentration.

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Section: Introductionsupporting

confidence: 54%

Long-term ozone trend and its effect on night airglow intensity of Li 6708 Å at Ahmedabad (23°N, 72.5°E), India and Halley Bay (76°S, 27°W), British Antarctic Service Station

et al. 2010

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“…On the other hand, the range of SQM-LE readings checked in our setup at ∼ 16 to 18 mag arcsec −2 would be closer to the actual NSB observed than the range studied by the calibration setups of the manufacturer and in Cinzano (2013b). Moreover, the spectral characteristic of our light source was very different from that of the typical light-polluted night skies (Sheen & Byun 2004;Slanger et al 2003;Della Prugna 1999;Lane & Garrison 1978). Nevertheless, performance of all optical components and SQL-LE units used in our study were monitored under the current design since the start of the project.…”

Section: Data Quality and Calibrationmentioning

confidence: 86%

Contributions of artificial lighting sources on light pollution in Hong Kong measured through a night sky brightness monitoring network

Pun

Leung

et al. 2014

Journal of Quantitative Spectroscopy and Radiative Transfer

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Light pollution is a form of environmental degradation in which excessive artificial outdoor lighting, such as street lamps, neon signs, and illuminated signboards, affects the natural environment and the ecosystem. Poorly designed outdoor lighting not only wastes energy, money, and valuable Earth resources, but also robs us of our beautiful night sky. Effects of light pollution on the night sky can be evaluated by the skyglow caused by these artificial lighting sources, through measurements of the night sky brightness (NSB). The Hong Kong Night Sky Brightness Monitoring Network (NSN) was established to monitor in detail the conditions of light pollution in Hong Kong. Monitoring stations were set up throughout the city covering a wide range of urban and rural settings to continuously measure the variations of the NSB. Over 4.6 million night sky measurements were collected from 18 distinct locations between May 2010 and March 2013. This huge dataset, over two thousand times larger than our previous survey (Pun & So 2012), forms the backbone for studies of the temporal and geographical variations of this environmental parameter and its correlation with various natural and artificial factors. The concepts and methodology of the NSN were presented here, together with an analysis of the overall night sky conditions in Hong Kong. The average NSB in Hong Kong, excluding data affected by the Moon, was 16.8 mag arcsec −2 , or 82 times brighter than the dark site standard established by the International Astronomical Union (IAU) (Smith 1979). The urban night sky was on average 15 times brighter than that in a rural location, firmly establishing the effects of artificial lighting sources on the night sky.

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“…This was further checked by measuring the position of three sky lines per grism and comparing them with values in the literature (Slanger et al 2003). The error was confirmed to be 0.5 Å.…”

Section: Wavelength Errorsmentioning

confidence: 89%

Extraplanar HII regions in the edge-on spiral galaxies NGC 3628 and NGC 4522

Stein

Bomans

Ferguson

et al. 2017

A&A

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Context. Gas infall and outflow are critical for determining the star formation rate and chemical evolution of galaxies but direct measurements of gas flows are difficult to make. Young massive stars and Hii regions in the halos of galaxies are potential tracers for accretion and/or outflows of gas. Aims. Gas phase abundances of three Hii regions in the lower halos of the edge-on galaxies NGC 3628 and NGC 4522 are determined by analysing optical long-slit spectra. The observed regions have projected distances to the midplane of their host from 1.4 to 3 kpc. Methods. With the measured flux densities of the optical nebular emission lines, we derive the oxygen abundance 12 + log(O/H) for the three extraplanar Hii regions. The analysis is based on one theoretical and two empirical strong-line calibration methods. Results. The resulting oxygen abundances of the extraplanar Hii regions are comparable to the disk Hii regions in one case and a little lower in the other case. Since our results depend on the accuracy of the metallicity determinations, we critically discuss the difference of the calibration methods we applied and confirm previously noted offsets. From our measurements, we argue that these three extraplanar Hii regions were formed in the disk or at least from disk material. We discuss the processes that could transport disk material into the lower halo of these systems and conclude that gravitational interaction with a companion galaxy is most likely for NGC 3628 while ram pressure is favoured in the case of NGC 4522.

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The High‐Resolution Light‐polluted Night‐Sky Spectrum at Mount Hamilton, California

Cited by 14 publications

References 19 publications

Long-term ozone trend and its effect on night airglow intensity of Li 6708 Å at Ahmedabad (23°N, 72.5°E), India and Halley Bay (76°S, 27°W), British Antarctic Service Station

Long-term ozone trend and its effect on night airglow intensity of Li 6708 Å at Ahmedabad (23°N, 72.5°E), India and Halley Bay (76°S, 27°W), British Antarctic Service Station

Contributions of artificial lighting sources on light pollution in Hong Kong measured through a night sky brightness monitoring network

Extraplanar HII regions in the edge-on spiral galaxies NGC 3628 and NGC 4522

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