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File:Northern Sky Narrowband Survey - H-alpha and Continuum.jpg

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Captions

Captions

212° stereographic projection of the region surveyed by the Northern Sky Narrowband Survey showing H-alpha (red) and continuum (green and blue).

Summary

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Description
English: 212° stereographic projection of the entire region surveyed by the Northern Sky Narrowband Survey showing hydrogen emissions and continuum light. Ionized hydrogen (Hα at 656.3 nm, without continuum) is mapped to red, blue continuum (including some [OIII] and Hβ emissions) is mapped to green, and red continuum (without Hα but with some [SII] emissions) is mapped to blue. Emission nebulae appear reddish while reflection nebulae are green to blue. Stars are partially subtracted in order to make the faint nebulae visible. The view was composed of 531,620 single exposures with a total exposure time of approximately 8,111 hours.

Emission nebulae (red) are concentrated near the galactic plane, extending from the left to the right side. Reflection nebulae (cyan), in the form of Integrated Flux Nebula, are also found at higher galactic latitudes. The cyan double ring is the ecliptic.

Other color composites of the same view

  • Emission lines [OIII], Hα, and [SII]
    Emission lines [OIII], Hα, and [SII]
  • Hα in pseudo-colors
    Hα in pseudo-colors
  • Continuum without Hα and with partially subtracted stars
    Continuum without Hα and with partially subtracted stars
  • True colors without subtraction of stars and emission lines
    True colors without subtraction of stars and emission lines
Date
Source Own work
Author Tk833

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current21:18, 6 October 2025Thumbnail for version as of 21:18, 6 October 20259,124 × 9,124 (25.78 MB)Tk833 (talk | contribs)Uploaded own work with UploadWizard

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