Point source list

[mariogrs]

Create a text based file with a list of point sources on the sky above a certain flux. Ideally we should have a spectral index model or the fluxes at different frequencies. Maybe use a 5 Jy cut at 1.4 GHz. At 800 MHz this would give 7 Jy assuming a spectral index of alpha=-0.7. A 10 Jy source at a given frequency will generate a temperature of about 0.5K at that frequency. This is about the same level of fluctuations as the galactic synchrotron. So it shouldn't be picked up by the flagger, although it might affect the map rms if there are many of those. Of course, if the spectral index is more steep, a 5 Jy cut at 1.4 GHz might still allow for strong sources at the UHF frequencies (550 - 1050 MHz).

[mariogrs]

I've linked this to an issue on Museek since it's supposed to be used in the pipeline. I hope you get notifications. Better to discuss here than in slack.

[mariogrs]

@physicistsam ?

[mariogrs]

I don't think this was completed yet.

[mariogrs]

Reopening and waiting for @physicistsam to confirm.

[kfornaz]

I don't think this was completed yet.

It was my mistake. I was using a touch screen and my finger moved it by mistake. Sorry.

[physicistsam]

I have all the possible notifications switched on, but still not getting anything from this. Apologies. I shall work on it now.

[mariogrs]

Maybe check spam? Other people are getting notifications.

[physicistsam]

Here is the version 0 of the catalogue. The txt file has four columns- RA, DEC, NVSS Flux at 1400 MHz, Spectral index.
I will try to improve upon this.
5jy_scat-V0.txt

PS: I am able to get notifications now.

[mariogrs]

Please check with Wenkai since he already produced a catalogue that he is using. We should converge on the format. Let's discuss this here.

…

On Mon, 19 Aug 2024, 11:06 Suman Chatterjee, ***@***.***> wrote: Here is the version 0 of the catalogue. The txt file has four columns- RA, DEC, NVSS Flux at 1400 MHz, Spectral index. I will try to improve upon this. 5jy_scat-V0.txt <https://github.com/user-attachments/files/16658167/5jy_scat-V0.txt> PS: I am able to get notifications now. — Reply to this email directly, view it on GitHub <#87 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB4WJEZB7XRRK2PEYG2PGODZSGYSVAVCNFSM6AAAAABLZAM6UKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDEOJWGA2TONRYGI> . You are receiving this because you modified the open/close state.Message ID: ***@***.***>

[mariogrs]

can we agree on the catalogue format? txt format? what columns?
@physicistsam @wkhu-astro @spinemart @piyanatk ?

[physicistsam]

@mariogrs, the txt file has four columns- RA, DEC, NVSS Flux at 1400 MHz, Spectral index. @wkhu-astro may have some input on how the module is reading the file.

[spinemart]

My proposition was to make this more general and leave empty the info we do not have atm: Name, Ra, Dec, freq at which flux, flux at that freq, spectral index, flag for the AO flagger. Il Lun 2 Set 2024, 19:39 Suman Chatterjee ***@***.***> ha scritto:

…

@mariogrs <https://github.com/mariogrs>, the txt file has four columns- RA, DEC, NVSS Flux at 1400 MHz, Spectral index. @wkhu-astro <https://github.com/wkhu-astro> may have some input on how the module is reading the file. — Reply to this email directly, view it on GitHub <#87 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AG6K2OJZKW2OGQ76MVMEZZTZUSPF3AVCNFSM6AAAAABLZAM6UKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGMRVGE2DCNBRHA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[piyanatk]

I second @spinemart, but we should make it clear whether the flux is integrated or peak value, and we might want to consider have more than one pair of (flux, frequency) if we want interpolate between subbands rather than using spectral indices. Given that we are in U and L band, I supposed we do not really have source catalogues with subbands in UHF, so spectral index is probably the way to go?

[mariogrs]

Let's go with: Name, Ra, Dec, Flux, Freq, spectral index (if available), Source info (maybe link - relevant to know if this is single dish or interferometer measured flux), flag for the AO flagger. I suggest to use a column or "|" to separate the columns. We can add more columns later with more fluxes.

[mariogrs]

New format: Name, Ra, Dec, Flux, Freq, spectral index, Source info (maybe link - relevant to know if this is single dish or interferometer measured flux). Use "|" to separate the columns - I'm not sure if python takes more than one character as separator. Leave column empty if there is no info.

[physicistsam]

@mariogrs and @wkhu-astro Please find the updated source catalog. It follows the format mentioned above. 5jy_scat-V0_new.txt

Please let me know if you have any comments or questions.