Northern Sky Narrowband Survey, DR0.2: Hα images

Images presented here are colored according to Hα intensity (without continuum) using a heat map palette ranging from blue to yellow. The brightest stars are added in white to visualize the regions where Hα intensity is uncertain due to contamination by starlight.

A description of the survey and the data release can be found at page Northern Sky Narrowband Survey: DR0.2.

Click on the images below to load them in full resolution using a JavaScript viewer.

Overview image of DR0.1 of Northern Sky Narrowband Survey in H-alpha
Legend for Overview image of DR0.1 of Northern Sky Narrowband Survey in H-alpha

Overview image showing a 212° stereographic projection of the entire surveyed region. This projection type was used because it preserves shapes. Maximum image resolution in the JavaScript viewer (click on the image) is 30″ at the center (δ=90°) and about 11″ at the boundary (δ=-16°).

The legend shows how the image is colored according to the Hα intensity in Rayleighs.

Tile images

The tiles are arranged in four rows centered at declinations 76.125°, 50.375°, 24.625°, and -1.125°. The size of each tile is 31° × 31°, with an overlap of at least 5.3°. Click on the preview images below to load them in maximum resolution of 10″ using a JavaScript viewer. The angle α below the preview images describes the right ascension of the image center. (The declination angle is found in the heading above the images. The ICRS coordinate system is used.) The links [Hα Legend] next to it refers to a legend that shows how the image was colored according to the Hα intensity in Rayleighs.

Declination δ=76.125°

Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=76.12 d, RA=22:17 h
α=22:17 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=76.12 d, RA=18:51 h
α=18:51 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=76.12 d, RA=15:26 h
α=15:26 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=76.12 d, RA=12:00 h
α=12:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=76.12 d, RA=8:34 h
α=8:34 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=76.12 d, RA=5:09 h
α=5:09 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=76.12 d, RA=1:43 h
α=1:43 h     [Hα legend]

Declination δ=50.375°

Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=23:00 h
α=23:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=21:00 h
α=21:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=19:00 h
α=19:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=17:00 h
α=17:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=15:00 h
α=15:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=13:00 h
α=13:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=11:00 h
α=11:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=9:00 h
α=9:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=7:00 h
α=7:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=5:00 h
α=5:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=3:00 h
α=3:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=50.38 d, RA=1:00 h
α=1:00 h     [Hα legend]

Declination δ=24.625°

Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=23:09 h
α=23:09 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=21:26 h
α=21:26 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=19:43 h
α=19:43 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=18:00 h
α=18:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=16:17 h
α=16:17 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=14:34 h
α=14:34 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=12:51 h
α=12:51 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=11:09 h
α=11:09 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=9:26 h
α=9:26 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=7:43 h
α=7:43 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=6:00 h
α=6:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=4:17 h
α=4:17 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=2:34 h
α=2:34 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=24.62 d, RA=0:51 h
α=0:51 h     [Hα legend]

Declination δ=-1.125°

Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=23:09 h
α=23:09 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=21:26 h
α=21:26 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=19:43 h
α=19:43 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=18:00 h
α=18:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=16:17 h
α=16:17 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=14:34 h
α=14:34 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=12:51 h
α=12:51 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=11:09 h
α=11:09 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=9:26 h
α=9:26 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=7:43 h
α=7:43 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=6:00 h
α=6:00 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=4:17 h
α=4:17 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=2:34 h
α=2:34 h     [Hα legend]
Northern Sky Narrowband Survey, DR0.2: H-alpha light; DEC=-1.12 d, RA=0:51 h
α=0:51 h     [Hα legend]

Monitor calibration

For optimal display, the monitor should be calibrated so that as many shades of the grayscale shown below are distinguishable. At least the 4% steps should be separated by every monitor. The 2% steps are visible on better monitors. To distinguish the 1% steps, a HDR monitor is required.

gray scale

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