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Last Post

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

fc does not produce executable fileStarted by:weistrop, 09/24/2013 07:46PM
I'm running IRAF 2.16 on a MacBook Pro,
OS X 10.7.3 and have downloaded fortran.
I'm trying to get an executable for a
program called trans in file trans.f.
When I type fc trans.f I get

ttools> fc trans.f
trans.f:
MAIN trans:
gcc: error trying...

1312

By: weistrop

10/10/2013 09:28PM

ximtool not picking WCSStarted by:massey, 10/15/2013 12:20PM
Since "tfinder" still isn't working
under 2.16, I've been using
astrometry.net to add WCS to my headers.
It's not as precise but it IS
automatic, and usually works.

However, it uses a gnomic projection
plus distortion term by default, and
even if t...

1330

By: massey

10/15/2013 02:00PM

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

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...

773

By: jeanm12

10/29/2013 01:53AM

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...

781

By: netoph

11/03/2013 03:06AM

Re: A WERID FLUX CALIBRATION PROBLEMStarted by:haha, 11/07/2013 12:35PM
I am extracting a spectrum of a star by
iraf. During the several steps near the
end , I meet a flux calibration problem
.

Anybody knows why?

calibrate
input=@imagelist3//btfc_tran.0001
output=@imagelist3//flux extinct+ flux+
\
extinction="./e...

930

By: haha

11/07/2013 06:24PM

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

841

By: tsaab

11/09/2013 02:41AM

Problem with mscred flatcombineStarted by:jonh, 11/14/2013 01:33PM
Hi,

I'm trying to use flatcombine to process
some data but I'm getting an error.

ERROR: Error processing ccd.013.fits
"ccdproc (ims, output="",
bpmasks="", ccdtype=ccdtype,
noproc=no)"
line 38:
mccdred$flatcombine.cl
call...

2314

By: fitz

11/14/2013 03:52PM

Problems with rspectext Started by:Alexa, 11/17/2013 08:00PM
Hi All,

I'm trying to convert some text files
back to fits images and I can't get it
to work right.

I do -

rspectext

And it doesn't give any errors but when
I try to display or use splot I get the
following error,

ERROR: FXF: SIMPLE ke...

2195

By: fitz

11/18/2013 06:13PM

the unit of splotStarted by:haha, 11/17/2013 02:53PM
Generall the two axis of a spectrum
displayed by splot are wavlength and
flux.The y axis are like
1.15e-18,1.25e-18...

Forgive my English.After reading the
help page of splot,I am very
confused.The unit of y axis is
ergs/cm2/sec/hz or ergs/cm2/sec/...

2544

By: haha

11/20/2013 05:50AM

problem with :.snapStarted by:Myrddin, 11/04/2013 11:12AM
Hi

I'm having trouble making hardcopies
with :.snap. I use the tool igi in
stsdas package to plot the spectra in
three windows. When i try to make the
hardcopy i get this:

igi = gcur
# to get into the display command ...

4124

By: fitz

11/23/2013 08:16PM

cosmic ray removal helpStarted by:mnicholls, 11/25/2013 03:06PM
I'm very new to IRAF and need to remove
Cosmic Ray hits from my spectra (all
spectra are saved as .fits files and
therefore come in both 1 and 2
dimensions, with various amounts of sky
subtraction, but I'm sure this is a well
known aspect to all you exp...

3708

By: fitz

11/26/2013 05:25PM

Ecreidentify and DoecslitStarted by:trvaccaro, 10/28/2013 08:33PM
I'm finding wavelength calibration a bit
of a hassle using Doecslit. I have
different comps for each Echelle spectra
and it wants me to ID lines every time.
Is there a way to invoke EcReidentify
during Doecslit's interactive stages of
wavelength calib...

1902

By: trvaccaro

11/26/2013 08:37PM

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...

1252

By: haha

11/27/2013 10:04AM

Problem with noao.onedspec.telluricsStarted by:elenamanjavacas, 11/22/2013 01:33PM
Dear all,

I am using the package tellurics in IRAF
to remove the tellurics from my spectra
(in .fits format) and I have a problem.
I use as an input: spectrum.fits(0), as
telluric spectrum: tell.fits(0) and as
output: out.fits. Everything runs, but
...

942

By: elenamanjavacas

11/28/2013 04:38PM

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

Errors in SPLOTStarted by:mnicholls, 12/05/2013 04:05PM
After scanning through past posts on
this topic I realize now you must be
bored of people asking this question,
but I still can't find an answer. How do
I calculate errors on Lorentzian and
Gaussian lines in SPLOT?

I've read through the help page whe...

1428

By: mnicholls

12/10/2013 11:16AM

Error in stsdas.lacos_specStarted by:elenamanjavacas, 12/12/2013 02:39PM
Dear all,

I am trying to remove the cosmics in my
1D spectra and I wanted to use
lacos_spec. These are my inputs:

Image Reduction and
Analysis Facility
PACKAGE = stsdas
TASK = lacos_spec

input = SCI_SLIT_FLUX_MERGE1D_...

2282

By: fitz

12/12/2013 05:40PM

Atomic data in STSDAS nebular packageStarted by:aturby, 12/18/2013 05:34AM
Is the atomic data current by default in
the newest versions of IRAF and STSDAS?

Specifically, the atomic data available
in the analysis.nebular package of
STSDAS. In this directory, the most
recent reference is from 2001, besides
one reference from...

1106

By: fitz

12/18/2013 06:34AM

msczero/mscred fails to open fileStarted by:rmich, 12/19/2013 02:10AM
I am having a confusing issue with
msczero. I am running IRAF 2.16.1 EXPORT
on 64-bit Linux. Typically, when I run
it, the image appears correctly in ds9,
and then as soon as I hit 'm' it fails.
I can try resetting it, and it then
fails immediately (w/o...

1244

By: rmich

12/19/2013 02:41AM

how to get the ascii file of one spec...Started by:haha, 12/19/2013 09:22PM
we can splot one spectrum easily.I know
there are commands can convert 1
extension spectrum fits to ascii.

How about multi-extension
spectrum?Generally there are
four-extensions for iraf reduction
spectrum.

I checked my spectrum fits files ,but
d...

2652

By: haha

12/22/2013 06:58AM

apall multispec format descriptionStarted by:salis, 01/09/2014 05:19PM
Hello,

Sorry for the basic question but I need
to know the description of bands when I
use multispec format in apall. I could
not find them anywhere. I have four
bands extracted in the final wavelength
calibrated spectrum. The last 2 seem
like the ba...

2621

By: fitz

01/09/2014 05:30PM

Problem with wspectext or scombineStarted by:candaceg, 01/12/2014 02:08AM
Hi,
hopefully this is a simple question but
I'm not able to find an answer anywhere
online. I have a script that takes a
set of 2D fits files, writes them out to
1D, and then write that out to a data
file using wspectext. The data file
goes in descen...

1618

By: candaceg

01/12/2014 02:37AM

mscred: ccdproc/flatcombine errorsStarted by:SashaB, 01/20/2014 10:03PM
Hi all,
I've been attempting to use the mscred
package to process some mosaiced data
from the SOAR Optical Images (SOI).
I've been encountering a series of
errors that have me rather puzzled, and
I was hoping that you might be able to
help.
To proc...

2563

By: fitz

01/22/2014 05:33PM

Problem with "@" files in onedspecStarted by:massey, 01/23/2014 12:28AM
Hi, Mike et al---

A collaborator who is running V2.16.1 on
her MacBook Pro emailed me with a
problem today that seemed unlikely and
incredible, but in fact I can reproduce
the problem on MY Mac Air also running
2.16.1. Here it is. If I do
something...

3872

By: massey

01/23/2014 01:52AM

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

imexam not reading correct pixel valuesStarted by:maren551, 02/10/2014 10:59PM
Hi, I just installed iraf for Fedora
FC20 and it worked like a charm,
installing-wise. But now that I am
testing the various tasks I found a
problem- and very fast . After loading
an image I started imexam and wanted to
check the fwhm on an image I have...

1697

By: fitz

02/10/2014 11:37PM

Which application should I use?Started by:mnicholls, 02/11/2014 01:57PM
I have a number of spectra which all
contain the same two Oxygen-III lines.
These lines should NOT show changes in
the value of the center wavelength and
the flux (i.e they should remain
constant across all spectra), however
some peaks have for some unk...

4113

By: fitz

02/11/2014 06:52PM

xzap blank image output in scriptStarted by:Santiago, 02/19/2014 04:04AM
Hi you guys, i'm in STScI trying to do
some Hubble archive processing and i'm
having this trouble with the xzap task
in xdimsum package. I'm trying to get an
image with cosmic rays only and a zero
background since i'm taking cosmic ray
statistics resear...

2509

By: Santiago

02/19/2014 05:29AM

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