<p>You could say "MJ in bins of x degrees in l" where x is the degrees spanned by a pixel.  Or, you could divide the fluxes by the steradians in each column and keep it MJ/sr or "Mean MJ/sr within longitudinal bins". Now the width of the bins is not important as long as they are small.</p>

CC BY-SA 3.0
2017-11-10T22:52:44.657Z
2017-11-10T22:52:44.657Z
eshaya
<p>If I've taken an image of the Galactic bulge with the pixel units in MJ per steradian:
<a href="https://i.sstatic.net/Y4BGt.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Y4BGt.png" alt="enter image description here"></a></p>

<p>and I've looked down each column of the image and added up the values:
<a href="https://i.sstatic.net/OGZQh.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/OGZQh.png" alt="enter image description here"></a>
then do the units change? My thinking is that I'm taking something that is measured per steradian (which is a solid angle) and integrated it along a single axis, which would be in degrees. Would this make the units of my graph now MJ per radian? Or am I simply adding values in MJ per sr, so the units don't change?</p>

<fundamental-astronomy><units>
Units of integrated flux density (irradiance) along longitudes
Jim421616
# Units of integrated flux density (irradiance) along longitudes

(Asked by: username_0 on 2017-10-30)

If I've taken an image of the Galactic bulge with the pixel units in MJ per steradian:
[![enter image description here](https://i.sstatic.net/Y4BGt.png)](https://i.sstatic.net/Y4BGt.png)

and I've looked down each column of the image and added up the values:
[![enter image description here](https://i.sstatic.net/OGZQh.png)](https://i.sstatic.net/OGZQh.png)
then do the units change? My thinking is that I'm taking something that is measured per steradian (which is a solid angle) and integrated it along a single axis, which would be in degrees. Would this make the units of my graph now MJ per radian? Or am I simply adding values in MJ per sr, so the units don't change?

**Tags:** fundamental-astronomy, units


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## 1 answers

### Answer by username_1 on 2017-11-10. Score: 1 | Accepted answer

You could say "MJ in bins of x degrees in l" where x is the degrees spanned by a pixel. Or, you could divide the fluxes by the steradians in each column and keep it MJ/sr or "Mean MJ/sr within longitudinal bins". Now the width of the bins is not important as long as they are small.


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