[daip] STFND task

[Leonia Kogan]

Hi Ian,

> (1) CPARM(1) - threshold brightness. Is this Jy/beam?

CPARM(1) should be given at the units used by the image.
Type 'imh' and you'll see the following line:

AIPS 1: Minimum=-5.45131616E-06      Maximum= 2.20364761E-02 JY/PIXEL
                                                             ^^^^^^^^
For this example the image is given at JY/PIXEL

>(2) CPARM(3) - Max star area in pixels. Is a 'pixel' here the same as the
>cell in IMAGR?
Actually 'explain' gives MIN instead of your max

CPARM(3)  Minimum area (in pixels) a star must cover to be
          considered a detection.

Anyway, Pixel size is given at the header again:
The pixel sizes at the RA and declination directions are given at the column 
'Coord incr' (the first two lines).

Leonia

PS:  Next time please address your AIPS problem to all short AIPS group
     daip at nrao.edu It will help better solve the problem




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>From ip at sunstar4.leeds.ac.uk Mon Jul 15 07:27 MDT 2002
Date: Mon, 15 Jul 2002 14:26:08 +0100 (BST)
From: Ian Pattison <ip at sunstar4.leeds.ac.uk>
X-X-Sender:  <ip at sunstar1>
To: <lkogan at cv3.cv.nrao.edu>
Subject: STFND task
MIME-Version: 1.0
X-Lines: 39
Status: RO

I wish to use the task STFND to search for sources of emission in a
field. I have two questions:

(1) CPARM(1) - threshold brightness. Is this Jy/beam?

(2) CPARM(3) - Max star area in pixels. Is a 'pixel' here the same as the
cell in IMAGR?


All I want to do is search for emission from an area larger than the
synthesized beam, AND with flux/beam greater than 72 uJy/beam (3 * rms
noise).



Regards,


Ian Pattison


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::                                            ::
::               Ian Pattison                 ::
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::Department of Physics & Astronomy           ::
::University of Leeds                         ::
::LS2 9JT                                     ::
::United Kingdom                              ::
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::Tel: +44 (0)113 2333872                     ::
::email: ip at ast.leeds.ac.uk                   ::
::WWW: http://ast.leeds.ac.uk/~ip             ::
::                                            ::
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