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what are the general tasks like sextr...Started by:haha, 09/30/2014 12:51PM
I mean tasks in iraf.

859

By: haha

10/04/2014 01:34PM

ESO files and xonedspec packageStarted by:fitz, 08/15/2018 04:49PM
[color=darkred][Moderator's Note:
Forwarded from Story posting][/color]

Using ESO file fits I realize I have to
use xonedspec package since the
wavelength data is given in a separate
array. Now I can "splot" the file where
before it says: ERROR: M...

857

By: fitz

08/15/2018 04:49PM

splot: deblending with constant redshiftStarted by:chewbacca, 07/27/2014 11:47AM
Hi,

I am using splot to fit doppler shift in
absorption lines that are very weak, so
I would like to take advantage of the
'single' option in the deblending
routine.
However, my lines are separated by ~150
nm so Delta(lambda) can vary quite a lot
be...

840

By: chewbacca

07/28/2014 07:44AM

mknoiseStarted by:tsaab, 11/09/2013 12:53AM
How much Poisson noise is added when i
am using mknoise?

839

By: tsaab

11/09/2013 02:41AM

Pixel subscript out of boundsStarted by:cassioleandro, 09/27/2018 08:49PM
I'm processing nifs data using adapted
nifsexample scripts. They run OK, but
when I try to nfextract the spectrum
from the final cubes I have the folowing
error message:

ERROR: Pixel subscript out of bounds
(catfbrgN20150630S0161[SCI,1][1:62,*])
...

826

By: cassioleandro

09/27/2018 08:49PM

Hedit colon separated coordinatesStarted by:dmag, 12/02/2016 05:22PM
I am trying to update the header of my
fits file with coordinates and time of
the observation and i want them in the
'hh:mm:ss' format. I use the hedit
command as follows

hedit test.fits RA '10:17:58' add+

but iraf convert it into a decimal
format...

823

By: fitz

12/06/2016 09:00AM

wspectext to linear wavelengthsStarted by:fitz, 07/09/2016 03:09AM
.[color=red][Moderator's Note: Forwarded
from submitted story on behalf of
user.][/color]

I have many (1400) spectra with
logarithmic binning in wavelength, how
do I make a text file
with wavelengths in Angstroms rather
than log(Angstroms)?

thank...

819

By: fitz

07/09/2016 03:28AM

finder_221 installation problemStarted by:prajwel, 06/01/2015 11:47AM
Hi, I am trying to install finder on a
centos. I tried "dynamic external
package loading", but unfortunately
finder is not listed there. I downloaded
the file from
ftp://iraf.noao.edu/iraf/extern/finder_221.tar.gz
and tried running "mkpg redhat". I end
...

806

By: fitz

06/03/2015 04:25PM

patterns found in lacos_spec's results Started by:haha, 05/14/2018 12:31PM
I used lacos_spec to remove cosmic rays
like below.
[code]lacos_spec input=a output=b
outmask=amask gain=0.95 readn=3.5
objlim=5 yorder=5 xorder=0[/code]

The result is like the attached image.
Patterns can be found in both the result
image and
the...

803

By: haha

05/14/2018 12:31PM

How to use Reidentify and fitcoordsStarted by:kirankumar, 09/17/2015 02:45PM
Hi All,

I am trying to reduce longslit spectral
data. I am new to it.

I used combine task to combine Flat
Frames to create MasterFlat and Arc
Frame to create MasterArc. I want to use
identify, reidentify, and fitcoord
tasks.

I placed NodA and ...

802

By: kirankumar

09/17/2015 02:45PM

Problem with gsflatStarted by:Eskol_Valentine, 06/13/2015 06:16PM
Hi, I have the last version of gemini
(with Ureka), but I'm a little
complicated with the task gsflat. Two
days ago, I was able work with my
standard, but yesterday I wanted to
continue with the galaxy, but I got this
error:

-------------------------...

800

By: fitz

06/15/2015 08:59PM

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

using irmfringeStarted by:Zeleke Amado, 08/20/2018 12:29PM
Dear
I had a data consisting of .fits images
taken using GTC 10m telescope. I have
done the preliminary reduction (flat
fielding and bias subtraction). But my
data is highly affected with fringing
problem. For removing this effect I have
reallized to a...

798

By: Zeleke Amado

08/20/2018 12:29PM

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

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

simultaneous fit to multiple arclampsStarted by:lucy1023, 05/24/2015 10:44PM
Is there a way to get IRAF to fit
multiple different arclamps
simultaneously, without adding the
arclamps together (which would lead to
some blending)? e.g., say I'd like
Identify to find all the features in a
HgNe lamp, then separately find all the
fea...

767

By: lucy1023

05/24/2015 11:19PM

Overscan regionsStarted by:rrbernardi, 06/27/2016 12:33AM
I am working with a image
(1:1026,1:4645) which uses two vertical
regions ([1:27,1:4616] and
[1180:1206,1:4616]) and one horizontal
region [27:1152,4617:4645] as overscan.
Can I include two overscan regions
(vertical) in BIASSEC parameter? What is
the c...

743

By: rrbernardi

06/27/2016 12:33AM

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

Format of the "id" files from the ide...Started by:Mike Potter, 11/10/2016 04:12PM
In the "id" file that is output by the
identify task (ex: kpnoslit.identify)
there is a table that has the pixel and
wavelength values entered by the user
during line identification. There is
another wavelength value shown as well,
which I'm assuming i...

740

By: fitz

11/10/2016 04:58PM

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

Deblending with splot -- fixing wavel...Started by:chewbacca, 08/03/2014 08:47AM
In fitting multiple Gaussian profiles in
splot or fitprofs, is there a way to fix
one center wavelength and let the others
vary? There appears to be only the
options of fixing all wavelengths,
shifting all wavelengths or letting all
wavelengths vary.......

736

By: fitz

08/03/2014 07:32PM

DISPCOR ProblemStarted by:fitz, 09/05/2018 04:16PM
[color=darkred][Moderator's Note:
Forwarded from story
submission][/color]

First of all, I'm new leaner in Iraf.
and I have a problem I need your help to
show me where i did the mistake. I wrote

cl> depar dispcor input
file:NGC_U7000.fits
outpu...

715

By: fitz

09/05/2018 04:16PM

External packagesStarted by:fabvitali, 11/09/2018 04:39PM
Hi, I have recently installed IRAF
V2.16.1 on my MacBookPro 2017 (Mojave
10.14) but I can't install external
packages. When I run ./configure from my
IRAF/extern directory, it get stuck on
"Initializing repository data ....". I
see on the pkgrepo that t...

700

By: fabvitali

11/09/2018 04:39PM

Ellipse: Mag_lerr and Mag_uerrStarted by:michgradstudent, 06/23/2016 01:45PM
Doe anyone know what the values MAG_LERR
and MAG_UERR in the ellipse output file
represent?
They seem rather small, so I thought
maybe that they represent the fraction
of MAG which the upper and lower limits
are.
e.g. MAG = 21.1 MAG_LERR = 0.0108 ...

694

By: michgradstudent

06/23/2016 01:45PM

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

merging Started by:giannicatanzaro, 10/16/2014 09:58AM
dear all

I have this question: how do I can merge
all the orders of an echelle spectrum in
a single spectrum?

thanks

Gianni

680

By: fitz

10/16/2014 10:46PM

center doesn't write text file in outputStarted by:le.davide, 10/22/2013 10:50PM
Hi,
all of a sudden the IRAF task
noao.digiphot.apphot.center doesn't
write the text file in output when I run
it in non-interactive mode.
If I run in interactive mode and I ask
to "write and quit", then it works.
Any idea about what do I have to cha...

680

By: fitz

10/22/2013 11:07PM

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

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

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