[AstroPy] AstroPy Digest, Vol 159, Issue 11

Tue Dec 31 16:00:20 EST 2019

Many thanks Peter and Rose.  I'll take a good look at specutils and also
Rose's GitHub entry.  
Happy New Year
Gordon

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Today's Topics:

   1. Re: Continuum subtraction (Peter Dzwig)
   2. Re: Continuum subtraction (Peter Dzwig)
   3. Re: Continuum subtraction (Finn, Rose)

----------------------------------------------------------------------

Message: 1
Date: Sun, 29 Dec 2019 17:32:17 +0000
From: Peter Dzwig <pdzwig at summaventures.com>
To: Gordon Dennis <gordon.b.dennis at gmail.com>, astropy at python.org
Subject: Re: [AstroPy] Continuum subtraction
Message-ID: <08f670c3-41f0-87c8-e34b-582cc3089351 at summaventures.com>
Content-Type: text/plain; charset=windows-1252

Thanks for asking this.  I have been looking at something a bit similar in
the optical and have also run into issues.

IMHO the specutils tools are OK/fine until the data gets noisy. Looking at
medium redshift (z~1.0) QSO spectra in particular (even woth a reasonable
S/N).

I too would be interested in any comments that people have on the relative
merits of the packages and recommendations.

Peter Dzwig

PS I also think that the specutils demos could make more use of real data in
this area and suggest ways of handling it.

On 28/12/2019 12:54, Gordon Dennis wrote:
> Good afternoon all
> 
> I am observing low-Z spiral galaxies through H-alpha filters as 
> tracers of SFR.? Are there any Python libraries available to perform 
> continuum subtraction on such images?
> 
> Gordon Dennis
> 
> ?
> 
> +44(0)1934 838096 / +44(0)7774628110 / Skype: gordon.dennis
> 
> Sent from my Analytical Engine
> 
> Description: analyticalEngine
> 
> ?
> 
> 
> _______________________________________________
> AstroPy mailing list
> AstroPy at python.org
> https://mail.python.org/mailman/listinfo/astropy
> 

-- 

Dr. Peter Dzwig

------------------------------

Message: 2
Date: Sun, 29 Dec 2019 17:31:29 +0000
From: Peter Dzwig <pdzwig at summaventures.com>
To: Gordon Dennis <gordon.b.dennis at gmail.com>, astropy at python.org
Subject: Re: [AstroPy] Continuum subtraction
Message-ID: <6b92cd25-5938-414a-379d-8375241214c6 at summaventures.com>
Content-Type: text/plain; charset=windows-1252

Thanks for asking this.  I have been looking at something a bit similar in
the optical and have also run into issues.

IMHO the specutils tools are OK/fine until the data gets noisy. Looking at
medium redshift (z~1.0) QSO spectra in particular (even woth a reasonable
S/N).

I too would be interested in any comments that people have on the relative
merits of the packages and recommendations.

Peter Dzwig

PS I also think that the specutils demos could make more use of real data in
this area and suggest ways of handling it.

On 28/12/2019 12:54, Gordon Dennis wrote:
> Good afternoon all
> 
> I am observing low-Z spiral galaxies through H-alpha filters as 
> tracers of SFR.? Are there any Python libraries available to perform 
> continuum subtraction on such images?
> 
> Gordon Dennis
> 
> ?
> 
> +44(0)1934 838096 / +44(0)7774628110 / Skype: gordon.dennis
> 
> Sent from my Analytical Engine
> 
> Description: analyticalEngine
> 
> ?
> 
> 
> _______________________________________________
> AstroPy mailing list
> AstroPy at python.org
> https://mail.python.org/mailman/listinfo/astropy
> 

-- 

Dr. Peter Dzwig

------------------------------

Message: 3
Date: Mon, 30 Dec 2019 11:47:46 -0500
From: "Finn, Rose" <rfinn at siena.edu>
To: Astronomical Python mailing list <astropy at python.org>
Subject: Re: [AstroPy] Continuum subtraction
Message-ID:
	<CAF=o2jF6V2nSr4s_fThTka+4AZoryemy8wcEB7DN77xiHUehsQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi Gordon,

I have some code to do continuum subtraction of H-alpha images
https://github.com/rfinn/halphagui/wiki  It's tailored to the projects I am
working on, but I could help you adapt it for your needs if you are
interested.

Take care,
Rose

On Sat, Dec 28, 2019 at 7:51 AM Gordon Dennis <gordon.b.dennis at gmail.com>
wrote:

> Good afternoon all
>
> I am observing low-Z spiral galaxies through H-alpha filters as 
> tracers of SFR.  Are there any Python libraries available to perform 
> continuum subtraction on such images?
>
> Gordon Dennis
>
>
>
> +44(0)1934 838096 / +44(0)7774628110 / Skype: gordon.dennis
>
> Sent from my Analytical Engine
>
> [image: Description: analyticalEngine]
>
>
> _______________________________________________
> AstroPy mailing list
> AstroPy at python.org
> https://mail.python.org/mailman/listinfo/astropy
>

--
Rose A. Finn, PhD
Department of Physics & Astronomy
Siena College
Loudonville, NY  12211
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