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fit1d and pixel mask with bad pixels ...Started by:gbhw, 03/06/2015 04:20PM
Dear Frank Valdes,

With fit1d, I would like to fit and
subtract the background of images, using
during the fit a pixel mask masking both
sources within the images and pixel
regions at borders (the latter usually
set at extreme high or low values in
t...

1111

By: gbhw

03/06/2015 04:20PM

apall routine is not extracting the w...Started by:jadiazt, 02/09/2015 10:11PM
Dear,

Hello, I am having the following
problem, I am trying to get a
1-dimensional spectrum from a
2-dimensional spectrum, already
calibrated by wavelength. The issue
comes that the routine apall is not
extracting the whole spectrum. It only
extracts...

741

By: jadiazt

02/09/2015 10:11PM

Persistent sky lines when extracting ...Started by:cwbullivant, 10/18/2014 07:14AM
For the last few months I've been
working with spectra taken at the Bok
telescope at KPNO, and one particular
data set has been especially difficult
to reduce properly. The spectra for this
night are generally fainter than the
rest of the data that I've...

1738

By: cwbullivant

10/18/2014 07:14AM

Extracting lambda-flux values of fitt...Started by:Francesca, 10/15/2014 11:55AM
Hi,

I am fitting some spectral lines with
the deblend option in the splot iraf
task. Once the fit has been done, I
would like to save, together with the
fit parameters (e.g. FWHM,flux, etc,
which I get in the splot.log file), also
the "wavelength-flu...

799

By: Francesca

10/15/2014 11:55AM

splot deblending vs fitprofs Started by:chewbacca, 10/06/2014 07:29PM
Hi,

I am measuring broad spectral lines in
iraf, and the problem is that the
measurements with deblending in splot
and fitprofs do not match. I use the
same file as the input, and set the
sigma0 and invgain parameters to the
same value in both measu...

783

By: chewbacca

10/06/2014 07:29PM

about the flux calibration of a spectrumStarted by:haha, 09/04/2014 03:49AM
when we run
apall

Automatically there is a size for an
aperture. That size is the FWHM or
something of the aperture? Or we can
choose the size of the aperture by
ourself?

If we choose by hand, the flux may
become arbitrary?

929

By: haha

09/04/2014 03:49AM

scopy: wavelength range problemStarted by:chewbacca, 08/27/2014 07:51PM
I am using scopy to copy portion of a
spectra with starting and ending
wavelengths w1 and w2. The rebin
parameter is set to yes, so I would
expect w1 and w2 to be exact (the
spectra covers a region well beyond w1
and w2).

However, in some cases scop...

677

By: chewbacca

08/27/2014 07:51PM

scombine with local snr weightStarted by:chewbacca, 08/17/2014 11:50AM
Is there a way to use scombine with the
weights in the overlap regions being the
local snr (signal to noise ratio)?

This is a fairly standard use and it
seems scombine doesn't support it...
what is the easiest way to do this in
iraf? I have a fairly ...

740

By: chewbacca

08/17/2014 11:50AM

daopars.mergerad problemStarted by:fitz, 06/29/2014 02:29PM
[color=red][Moderator's Note: Forward
from story posting][/color]

I'm running a script to perform psf
photometry on a series of images. Doing
this I don't want stars to be merged.
Therefore I set daopars.mergerad to 0.0
but stars still get merged?...

1512

By: fitz

06/29/2014 02:29PM

IRAF Photometry GUIStarted by:mshemuni, 03/17/2014 12:07PM
Hi everyone.
I wanted to introduce a GUI for IRAF
Photometry named MYRaf.
MYRaf v2.0 Beta released a couple days
ago and it has bugs. But with feedbacks
it will be a good GUI for IRAF.
MYRaf's description from offical web
site:

[quote]The MYRaf is...

2150

By: mshemuni

03/17/2014 12:07PM

writing an IRAF taskStarted by:saumya, 03/04/2014 04:17PM
Hi guys !!! Wassuup !!!

I need to write an IRAF task. I am
clueless. Please help me. I am
explaining the problem below-

Let us have a fits image where all the
counts in pixel boxes are zero. Now, I
need to assign values (real or integer)
to differ...

867

By: saumya

03/04/2014 04:17PM

writing an IRAF taskStarted by:saumya, 03/04/2014 04:15PM
Hi guys !!! Wassuup !!!

I need to write an IRAF task. I am
clueless. Please help me. I am
explaining the problem below-

Let us have a fits image where all the
counts in pixel boxes are zero. Now, I
need to assign values (real or integer)
to differ...

675

By: saumya

03/04/2014 04:15PM

Intensity matching in galaxy imagesStarted by:vivekm, 01/27/2014 07:16PM
hi,
My objective is to look for variations
at the centre of some irregular
galaxies. For this I have to match the
intensity of the galaxy features (HII
regiions) so that when I take the
difference, all these galaxy features
cancels out and only the v...

1896

By: vivekm

01/27/2014 07:16PM

how to distinguish the slit image in ...Started by:haha, 11/29/2013 03:25PM
Please check the image below.
http://www.lco.cl/draft/the-wfccd-in-multi-grism-mode/images/wfccd_quick_look_tool.gif

There are many telluric lines in the
image,but one of them should be the
image of the slit.How to find it?
If I have got the spectr...

694

By: haha

11/29/2013 03:25PM

wavelength and flux calibration files...Started by:haha, 11/27/2013 10:04AM
about wavelength calibration
Which arc files should I use?
There are no FORS2 calibration
files at http://www.eso.org/pipelines/.
However I tried FORS's files but
only found,say,

F2_GMDT_090210A_G300I_OG590_Norma.fits
is a 6x10 mat...

1246

By: haha

11/27/2013 10:04AM

2D Spectrum AlignStarted by:netoph, 11/03/2013 03:06AM
Hi there.

Just a simple question How can I align a
2D Spectrum image with an other 2D
Spectrum image?. Is there a package that
find the centroid of the star or galaxy
for align the image?.

Also how can I correct the shifts made
by the move of the...

780

By: netoph

11/03/2013 03:06AM

Wavelength solution troublesStarted by:jeanm12, 10/29/2013 01:53AM
Hello,

I have lots of echelle data that I am in
the process of reducing. I have gone
through and used ecidentify to obtain an
accurate wavelength solution from one
night's data that I am using as the
basis for the rest of my nights. I then
have run e...

772

By: jeanm12

10/29/2013 01:53AM

geotran issueStarted by:massey, 09/28/2013 07:46AM
I'm using geomap and geotran to try to
align two ccd direct images taken one
right after another; the linear pixel
shift is about half a pixel. I get a
very nice geomap solution (rms < 0.1
pixel) but when I transform one of the
images to match the o...

1989

By: massey

09/28/2013 07:46AM

Feature Detection in Smoothed ImagesStarted by:fitz, 07/21/2013 09:08PM
[color=red:1368f64d54] [Moderator's
Note: Posted on user's behalf]
[/color:1368f64d54]

My purpose is to smooth an optical image
and check whether there is a source at
a ra&dec which is got from other
energy band.The source is near a
galaxy's cen...

1332

By: fitz

07/21/2013 09:08PM

ALLSTAR problemStarted by:fitz, 03/27/2013 10:07PM
[color=red:3f0d9b6248]Note: posted on
behalf of user by
moderator.[/color:3f0d9b6248]

While running the daophot process I
encounter a rather weird result of the
allstar routine. When I plot the
mag-mag_err of the sources as derived
from the image.mag...

1106

By: fitz

03/27/2013 10:07PM

PSF subtraction problemStarted by:fitz, 03/27/2013 09:58PM
[color=red:91c753834f]Note: posted on
behalf of user by
moderator.[/color:91c753834f]

I have a problem with daophot. I can't
find any answer on the iraf.net forum.
If you or somebody can help, I am much
appreciated.

I am working on images of different...

1720

By: fitz

03/27/2013 09:58PM

Optimal vs non-optimal extraction for...Started by:galtavi, 02/28/2013 09:49AM
Dear IRAF users, I would like to ask
your opinion about this "problem" I
found with the optimal extraction of
spectra contaminated by second order
that may be of general interest.
I want to extract all the flux, also the
contaminating one, because I'll...

1315

By: galtavi

02/28/2013 09:49AM

msctpeak / tpeak: save guesses?Started by:keflavich, 02/11/2013 07:19PM
Is it possible to save the list of
manually fitted coordinates (input
guesses and/or centroided pixels) when
running msctpeak / tpeak? I've found
myself needing to re-fit coordinates
many times, and it's a huge waste of
time to have to re-centroid by h...

1058

By: keflavich

02/11/2013 07:19PM

Resetting CRVAL1 after scopyStarted by:stockton, 02/09/2013 01:26AM
scopy retains the original value of
CRVAL1 after extracting a subregion of a
spectrum, providing a pixel offset
(CRPIX1) to compensate for the
wavelength difference. I need to feed
these spectra into an application that
depends on having a value of CRVA...

1126

By: stockton

02/09/2013 01:26AM

msccmatch works, then second try failsStarted by:keflavich, 02/05/2013 06:48PM
I successfully ran msccmatch on an image
where I had come up with a decent fit
using msctpeak:

[quote:279c35b722]msccmatch
S20130131S0063.fits[1]
robberto_plaintext.txt usebpm=no
MSCCMATCH:
S20130131S0063.fits[1]:
3838 input coordinates
3799/...

1555

By: keflavich

02/05/2013 06:48PM

ccdmask errorStarted by:jdm, 11/21/2012 10:28PM
Hi,

I'm trying to create a bad pixel mask
for each panel of a six-chip mosaic
image. I run mscarith to divide one flat
by another (creating ratio.fits), and
then I run ccdmask individually for
ratio.fits[1] through ratio.fits[6]. It
creates the first f...

1628

By: jdm

11/21/2012 10:28PM

splot ERROR: MWCS: dimension mismatch...Started by:jsmoker, 07/11/2012 12:54PM
Hello,

I am trying to 'splot' a reduced CRIRES
spectrum with the following version of
iraf

which cl
/scisoft/bin/cl
cl

NOAO/IRAFNET PC-IRAF Revision 2.14.1
Mon Sep 15 10:12:05 MST 2008
This is the RELEASED version of IRAF
V2.14 supporting PC...

3578

By: jsmoker

07/11/2012 12:54PM

improving flattening/sky subtraction ...Started by:jlowenthal, 06/28/2012 08:37PM
We're working with Gemini/GMOS r-band
images and are seeking advice on
improving the flat-fielding. Here's
what we've done to our 55x5min science
frames:

* gbias to overscan-subtract and coadd
the biases to make a master bias
* giflat to make an OS-...

2352

By: jlowenthal

06/28/2012 08:37PM

PSFMATCHStarted by:T_anestis, 06/04/2012 12:12PM
I am trying to match the psf from two
images. I am using the task there but i
dont really get the calling sequence.

input = Ha.fits,Cont.fits Input
images
referenc= Ha.fits Reference images or
reference
psfdata =
Ha.fits.psf.1.fits,Cont.fits.1.p...

1579

By: T_anestis

06/04/2012 12:12PM

Question about apfind, aptrace and pa...Started by:emma, 06/01/2012 12:45AM
Hi Mike, Frank,

I have a question about aptrace and
database files that I was hoping you'd
be able to help me with. I have used
apfind on an image, which has created a
database file with 40 apertures. I have
determined which aperture I am
interested in...

1693

By: emma

06/01/2012 12:45AM

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