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Contains:  M 106, NGC 4258, NGC 4248
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M106 Anomalous Arms in Narrowband, 


            Kevin Morefield
M106 Anomalous Arms in Narrowband

M106 Anomalous Arms in Narrowband

Technical card

Resolution: 2224x1483

Dates:May 13, 2019

Astrodon Ha 5 nm: 57x1200" -30C bin 1x1
Astrodon OIII 3 nm: 18x1200" -30C bin 1x1

Integration: 25.0 hours

Darks: ~20

Flats: ~20

Bias: ~20

Avg. Moon age: 8.97 days

Avg. Moon phase: 66.52%

Bortle Dark-Sky Scale: 3.00 job: 2697615

RA center: 184.735 degrees

DEC center: 47.305 degrees

Pixel scale: 0.728 arcsec/pixel

Orientation: 310.395 degrees

Field radius: 0.270 degrees

Locations: Sierra Remote Observatory, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories


I find the anomalous arms or jets in the core of M106 fascinating so I devoted some time to these in both Ha and OIII. These arms are brightest in the x-ray and radio wavelengths but show up well in NB.

From an APOD on these: "an analysis of the x-ray and radio data suggests that the anamolous arms are composed of material heated by shock waves. Detected at radio wavelengths, powerful jets originating in the galaxy's core likely drive the shocks into the disk of NGC 4258."

Another beautiful view of these in a visible light APOD is here:

Anything that happens outside the plane of rotation of the galaxy is interesting to me. And that these emanate from the black hole at the galaxy core makes them doubly interesting.

This is comprised of 19 hours of Ha and 6 hours of OIII at 5 and 3nm respectively. I was interested to see that the arms did appear in the OIII data as well.

The blend is a bi-color with just a bit of Ha in the green. The stars are RGB.



Kevin Morefield
License: None (All rights reserved)

Sky plot

Sky plot


M106 Anomalous Arms in Narrowband, 


            Kevin Morefield

In these public groups

Narrowband imaging