Telecon: Oct. 9-13, 2017 (Oct. 11, 4 pm German time)

[SihanJiao]

1. Review a paper Sihan read http://iopscience.iop.org/article/10.1088/0004-637X/764/2/140/meta [Myers+13: ORIGIN OF THE DENSE CORE MASS FUNCTION IN CONTRACTING FILAMENTS].

2. Going through working progress SCUBA2 model simulation

3. Todo list for the following week

[SihanJiao]

I could get all existing observation from CADC now and I am checking the galactic center region data. From the product, it seems that the 15 hours band 2 observation towards to the galactic center is still not deep enough at 450 um band. I am re-running the 450 um data by using pipeline and will combine it with our 17A observations.

[baobabyoo]

Good. We need to have a quantitative sense about "not deep enough". You can include your reduced 450 um and 850 um images as inline figures in a ipython notebook (and please name the file properly, such that we are able to track it). Please present the maps on big enough angular scales, such that the full Daisy patterns are covered.

[baobabyoo]

Hmm, I need to organize an event tomorrow (Wed.) 4 pm Germany time. Can we do 3 pm or 2:30 pm instead?

[SihanJiao]

Sure. 3 pm is better for me.

[baobabyoo]

Sure. Let's do 3 pm.

[SihanJiao]

The fakemap in mapmaker works and I just uploaded the simulated SCUBA2 data here https://github.com/SihanJiao/Orion-A-combination/blob/master/Identify%2Bthe%2Blargest%2Brecoverable%2Bangular%2Bscale%2Bof%2BSCUBA2.ipynb

I will then compare the power spectrum of the model and simulated images to identify the largest recoverable angular scales. But it seems the fake map's scale is not very suitable (a bit high).

[baobabyoo]

Very good step! Thanks!

[SihanJiao]

I compared the power spectrum of the model and simulated images here. https://github.com/SihanJiao/Orion-A-combination/blob/master/Identify%2Bthe%2Blargest%2Brecoverable%2Bangular%2Bscale%2Bof%2BSCUBA2.ipynb

It seems that the simulated SCUBA2 map could cover much larger angular than what we think. But I think is this is related to the too high flux scale of the input fake map? Which may let more lager scale structures remind...

[baobabyoo]

Did you assume some temperature distribution and spectral index when you scale the observations to 850 micron? The data reduction procedure will filter some fluxes at the brightness temperature level of the sky. If the model is too much brighter than the sky, then maybe not much will be filtered.

How did you scale to the proper angular resolution? The physical scale resolved by the scuba2-850 micron resolution (~14" angular resolution) at d~1350 pc will correspond to that resolved by a ~135" angular resolution observation for a d~140 pc source. Maybe a proper way of simulating the right angular resolution is to first smooth the image to the corresponding angular resolution, before scaling the pixel size and intensity.

[SihanJiao]

I didn't assume any temperature distribution r spectral index, and I just followed the example of fakemape learning materials, simply copy the model image and put it on a blank scuba2 map.

I have re-sacled the flux of model image, and then re-done the simulation. In the power spectrum of the model and simulated images, the simulated SCUBA2 image match model image very well from the angular scale from 14" to 3' and still have a good coverage until 10'....

I will try to smooth the image before scaling the pixel size and intensity.

[baobabyoo]

Then maybe subtract the simulated image from the model image, and present the difference as an image to visualize what was filtered during data reduction.

[baobabyoo]

Is your conversion from spatial frequency to angular scale correct? From your power spectrum plot, it seems like the vertical dotted line marking the scuba2 beam is well below the half power level?

[SihanJiao]

It seems the largest recoverable angular ccale of SCUBA2 at 850 um band is 270 arcsec (4.5 arcmin). I have updated here in the last figure. https://github.com/SihanJiao/Orion-A-combination/blob/master/Identify%2Bthe%2Blargest%2Brecoverable%2Bangular%2Bscale%2Bof%2BSCUBA2%20.ipynb

And could we have a regular telecon this week?

[baobabyoo]

Sure. Still Thursday?

Best wishes, Baobab

On Mon, Nov 13, 2017 at 2:45 PM, Sihan Jiao notifications@github.com wrote:

It seems the largest recoverable angular ccale of SCUBA2 at 850 um band is 270 arcsec (4.5 arcmin). I have updated here in the last figure. https://github.com/SihanJiao/Orion-A-combination/blob/ master/Identify%2Bthe%2Blargest%2Brecoverable%2Bangular%2Bscale%2Bof% 2BSCUBA2%20.ipynb

And could we have a regular telecon this week?

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[SihanJiao]

Angtime is fine with me this Thursday, and maybe we could have this telecon at 4 pm German time or sometime else? I could open another Issue for this week's telecon once the time is fixed.

[baobabyoo]

Yes 4 pm Germany time sounds good.