DEFPOS Hα observations of the W80 Complex

Aksaker, Nazım

doi:10.1088/1674-4527/13/5/006

Cited by 3 publications

(6 citation statements)

References 25 publications

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“…An HII region are generally fainter than medium aurorae. We use the DEFPOS results [10] which gives HII region brightness in Rayleigh (see fig 13). Whole regions have brightness in the range between 300 and 1100R which corresponds to aurorae between faint (110R) and medium (1820R).…”

Section: Discussionmentioning

confidence: 99%

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Optimization of a compact static interferometer based on ImSPOC technology for a wide field polar lights monitoring

Coarer

Richard

Robert

et al. 2021

International Conference on Space Optics — ICSO 2020

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In the context of the creation of a Distributed Space Weather Sensor System (D3S), the European Space Agency (ESA) is planning to fly a miniaturized payload for the monitoring of the auroral emissions with the project Wide Field Auroral Imager (WFAI). In order to meet ESA's requirements for an Auroral Optical Spectral Imager (AOSI), CSUG will build a breadboard as a proof of concept based on Imager Spectrometer on Chip (ImSPOC) technology.Imaging Spectrometer on Chip (ImSPOC) technology consists of a matrix composed by multiple, low finesse, Fabry-Perot modules mounted in one unique structure. Each Fabry-Perot cavity has a fixed optical path difference distributed from optical contact up to maximum elevation in order to have the desired spectral resolution and the spectral coverage. So, in one snapshot it is possible to "scan" several optical path differences and reconstruct the spectrum for each point of the field of view. The advantage of this technology is to reduce the mass and dimensions but also that it collects sufficient number of photons allowing the observation of the faintest aurora (Not visible with naked eye) with short integration time. This makes it a particularly well-suited technology for small satellite payload design in the framework of polar lights monitoring.We present here the optimization of the ImSPOC technology in the context of WFAI mission. This optimization allows us to recorded polar lights spectra in the wavelength range of 350 to 950 nm within an exposure between 10 and 60 s. The field of view of the instruments is 57° × 57°, obtained by combination of 9 individual modules with small dimension (one module fits in a 60 × 45 × 55 mm 3 box). The simulated performances of the instrument are really encouraging. The spectrometer must have a spectral resolution of 1 nm at 350 nm.

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Section: Discussionmentioning

confidence: 99%

“…Figure 13. from Aksaker [10], America and Pelican nebulae with identified region and corresponding brightness in table 7. CONCLUSIONS AOSI and AUI take part of the WFAI Payload developed for D3S mission.…”

Section: Discussionmentioning

confidence: 99%

Optimization of a compact static interferometer based on ImSPOC technology for a wide field polar lights monitoring

Coarer

Richard

Robert

et al. 2021

International Conference on Space Optics — ICSO 2020

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“…Table 2 compares the results of the previous literature mentioned in the introduction with this work. The big differences appear only in the DEFPOS observations (Aksaker 2013). Aksaker et al (2011) have statistically analyzed the spectra of 10 nebulae with DEFPOS, and stated that the FWHMs in DEFPOS are 10 km s −1 wider than those in other literature, and the radial velocity of DEFPOS has a deviation of 3 km s −1 .…”

Section: Emission Line Measurements In the W80 Regionmentioning

confidence: 97%

“…Haffner et al (2003) have observed only five positions with the Wisconsin H-alpha Mapper (WHAM) in 2003. The most recent spectral observations are made by Aksaker (2013), and 26 spectra obtained with employed the Dual Etalon Fabry Perot Optical Spectrometer (DEFPOS). The data mentioned above are contributed greatly to our understanding of the physical conditions in the W80 region.…”

Section: Introductionmentioning

confidence: 99%

LAMOST MRS-N Observations of the W80 Region

Li,

Wu,

Yao

et al. 2022

Preprint

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The spectral observations and analysis for the W80 Region are presented by using the data of Medium-Resolution Spectroscopic Survey of Nebulae (MRS-N) with the Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST). A total of 2982 high-quality nebular spectra have been obtained in the 20 square degree field of view (FoV) which covers the W80 complex, and the largest sample of spectral data have been established for the first time. The relative intensities, radial velocities (RVs), and Full Widths at Half Maximum (FWHMs) are measured with the high spectral resolution of LAMOST MRS, for Hα λ 6563 Å, [N II] λλ 6548 Å, 6584 Å , and [S II] λλ 6716 Å, 6731 Å emission lines. In the field of view of whole W80 Region, the strongest line emissions are found to be consistent with the bright nebulae, NGC 7000, IC 5070, and LBN 391, and weak line emissions also truly exist in the Middle Region, where no bright nebulae are detected by the wide-band optical observations. The large-scale spectral observations to the W80 Region reveal the systematic spatial variations of RVs and FWHMs, and several unique structural features. A 'curved feature' to the east of the NGC 7000, and a 'jet feature' to the west of the LBN 391 are detected to be showing with larger radial velocities. A 'wider FWHM region' is identified in the eastern part of the NGC 7000. The variations of [S II] / Hα ratios display a gradient from southwest to northeast in the NGC 7000 region, and manifest a ring shape around the 'W80 bubble' ionized by an O-type star in the L935. Further spectral and multi-band observations are guaranteed to investigate in detail the structural features.

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“…Haffner et al (2003) observed only five positions with the Wisconsin H-alpha Mapper (WHAM) in 2003. The most recent spectral observations were made by Aksaker (2013), and 26 spectra were obtained with the Dual Etalon Fabry-Perot Optical Spectrometer (DEFPOS). The data mentioned above contributed greatly to our understanding of the physical conditions in the W80 region.…”

Section: Introductionmentioning

confidence: 99%

LAMOST MRS-N Observation of the W80 Region

Li¹,

Wu²,

Yao³

et al. 2022

Res. Astron. Astrophys.

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The spectral observations and analysis for the W80 region are presented by using the data of Medium-Resolution Spectroscopic Survey of Nebulae (MRS-N) with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). A total of 2982 high-quality nebular spectra have been obtained in the 20 square degree field of view which covers the W80 complex, and the largest sample of spectral data has been established for the first time. The relative intensities, radial velocities (RVs), and full widths at half maximum (FWHMs) are measured with the high spectral resolution of LAMOST MRS-N, for Hα λ6563 Å, [N ii] λλ6548 Å, 6584 Å, and [S ii] λλ6716 Å, 6731 Å emission lines. In the field of view of the whole W80 region, the strongest line emissions are found to be consistent with the bright nebulae NGC 7000, IC 5070, and LBN 391, and weak line emissions also exist in the Middle Region, where no bright nebulae are detected by the wide-band optical observations. The large-scale spectral observations of the W80 region reveal the systematic spatial variations of RVs and FWHMs, and several unique structural features. A “curved feature” to the east of NGC 7000, and a “jet feature” to the west of LBN 391 are detected to be showing larger RVs. A “wider FWHM region” is identified in the eastern part of NGC 7000. The variations of [S ii]/Hα ratios display a gradient from southwest to northeast in the NGC 7000 region, and manifest a ring shape around the “W80 bubble” ionized by an O-type star in L935. Further spectral and multi-band observations are guaranteed to investigate in detail the structural features.

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DEFPOS Hα observations of the W80 Complex

Cited by 3 publications

References 25 publications

Optimization of a compact static interferometer based on ImSPOC technology for a wide field polar lights monitoring

Optimization of a compact static interferometer based on ImSPOC technology for a wide field polar lights monitoring

LAMOST MRS-N Observations of the W80 Region

LAMOST MRS-N Observation of the W80 Region

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