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QUERY REGAARDING HOW TO PLOT AZIMUTHA...Started by:bijusaha, 08/04/2023 12:48PM
I have used the ELLIPSE task to obtain
the radial variation of intensity for a
galaxy but that is averaged over
azimuthal angle for each ellipse defined
by some semi major axis. How to extract
the how to obtain the variation of
intensity with azimuthal ... 		 
1470 0
By: bijusaha
08/04/2023 12:48PM
Normal Topic
Difficulty with reidentifyStarted by:Patrick Watson, 02/28/2022 06:51AM
Hello from a lone IRAF user,
I have a spectrograph susceptible to
flexure caused by temperature changes
and gravity. The calibration lamp is
internal to the spectrograph and hence
any shift between calibration images can
be sheeted home to the spectrog... 		 
1340 0
By: Patrick Watson
02/28/2022 06:51AM
Normal Topic
Problem with eqwidthStarted by:Hawkmoon, 05/28/2019 04:57PM
Hello all,

Whenever I try to run eqwidth, I always
get an index1 and eqwidth1 of 0. Below
is my bandpass file info. and the output
when I run the task.

halpha 6500 10 none line 7000 10 none

spectrum band1 flux1 cont1
cflux1 index1... 		 
611 0
By: Hawkmoon
05/28/2019 04:57PM
Normal Topic
Problems with crfixStarted by:Francesca, 04/19/2019 09:52AM
Hi,

I am trying to use crfix to remove
cosmic rays from 2D spectra.
For each spectrum, I have created a
cosmic ray mask (.pl), using the
imcombine task, providing the name of
the output rejmask.
The masks created by imcombine look
fine, since whe... 		 
644 0
By: Francesca
04/19/2019 09:52AM
Normal Topic
Problem with Gemini IRAF for gemini d...Started by:minhee, 11/15/2018 05:46AM
Hello, all.
I have a problem with Gemini IRAF when I
run gsflat for data redcution of GMOS
data.
Here is the error what I saw.

---------------------------------------------------------------------------------------------------------------
gmos> g... 		 
999 0
By: minhee
11/15/2018 05:46AM
Normal Topic
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... 		 
698 0
By: fabvitali
11/09/2018 04:39PM
Normal Topic
Accessing images using URLs in IRAF w...Started by:abraham, 10/08/2018 04:39PM
Hi - I'd like to access some images in
IRAF using a URL, which I believe is now
a built-in capability of IRAF 2.16. In
particular, I'd like to do things such
as those shown in this interesting video
put up on YouTube by the USVAO folks:

https://www.y... 		 
670 0
By: abraham
10/08/2018 04:39PM
Normal Topic
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,*])
... 		 
824 0
By: cassioleandro
09/27/2018 08:49PM
Normal Topic
RA Dec coordinates in APPHOT outputStarted by:salis, 09/25/2018 08:08PM
Hello,

I am trying to get ra and dec in the
apphot/daofind and apphot/phot outputs.
I am trying this with an image with wcs
obtained from the astrometry.net.
However, I could not manage. I used
logical in the daofind wcsout parameter.


Could you ... 		 
496 0
By: salis
09/25/2018 08:08PM
Normal Topic
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 0
By: fitz
09/05/2018 04:16PM
Normal Topic
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 0
By: Zeleke Amado
08/20/2018 12:29PM
Normal Topic
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... 		 
856 0
By: fitz
08/15/2018 04:49PM
Normal Topic
GEOMAP/GEOTRANStarted by:zech2453, 08/07/2018 10:20PM
Hi I've been trying to run
geomap/geotran on some of my distorted
images but I cannot seem to find the
right fit. What I've done:

1. Generated a coordinates list of xin
yin xref yref
2. Fed said list into geomap
3. Use geomap outputs and fed into g... 		 
1173 0
By: zech2453
08/07/2018 10:20PM
Normal Topic
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 0
By: haha
05/14/2018 12:31PM
Normal Topic
Greek letters in axis labels for sgraphStarted by:weistrop, 02/13/2018 08:06PM
I'm having trouble with Greek letters in
axis labels for sgraph. I have
what looks like the exact same
formatting for the x and y axes, but
the y
axis label is fine while the x label has
spaces in front of the Greek
letters. This is after I use
... 		 
1118 0
By: weistrop
02/13/2018 08:06PM
Normal Topic
problem working on SDSS spectra (fits...Started by:ania.wojtowicz, 11/28/2017 03:32PM
Hello,

I have trouble with sdss spectra that
are stored as fits table. I would like
to correct and display to prepare to
further analysis but do that I need to
have fits image system.
I have tried various different methods
including tcopy fits tabl... 		 
1059 0
By: ania.wojtowicz
11/28/2017 03:32PM
Normal Topic
Fringing problem and b_niter paramete...Started by:uros, 08/29/2017 05:45AM
Hi,

I am working with low S/N spectra.
Because of this I am trying to minimise
influence of the fringing. Did exist
some specific way how to deal with my
flat fields to remove effect of the
fringing on my data?
At this moment for flat fielding I am
... 		 
1152 0
By: uros
08/29/2017 05:45AM
Normal Topic
Unresolved point sources with gallistStarted by:rachanab, 07/07/2017 11:26AM
I am making fake sources for my
completeness simulations and I am using
gallist + mkobjects to do this. I can
get a distribution for my sources using
parameters like x and y coordinates,
magnitudes, profile types, half-flux
radii, axial ratios, position... 		 
1122 0
By: rachanab
07/07/2017 11:26AM
Normal Topic
installing MIKE-mtools package on ubuntuStarted by:fitz, 06/16/2017 03:28PM
[color=red][Moderator's Note: Forwarded
from story submission][/color]

Hi,
I am trying to install the iraf mtools
package (designed by Jack Baldwin for
the reduction of Magellan MIKE spectra)
on a Dell laptop running ubuntu 14.04.
I followed Phil ... 		 
1212 0
By: fitz
06/16/2017 03:28PM
Normal Topic
Setting the image center in msctpeakStarted by:paco, 05/11/2017 08:51PM
Hello,

I am using msctpeak for tweaking the WCS
on various images---some from mosaic
detectors, others from single-chips.
msctpeak is really convenient because of
its nice interactive features (vs using
ccfind and ccmap, for instance).

My problem... 		 
908 0
By: paco
05/11/2017 08:51PM
Normal Topic
SAOImage DS9 version 7.5 is now avail...Started by:joye, 12/29/2016 05:54PM
SAOImage DS9 version 7.5 is now
available for download at
http://ds9.si.edu/site/Download.html

New features

New Preference file support- allows
multiple preference files base on
version number
Improved CIAO regions file
compatibility
Improved FI... 		 
1329 0
By: joye
12/29/2016 05:54PM
Normal Topic
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... 		 
742 0
By: rrbernardi
06/27/2016 12:33AM
Normal Topic
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 0
By: michgradstudent
06/23/2016 01:45PM
Normal Topic
SAOImage DS9 version 7.4 is now avail...Started by:joye, 12/21/2015 09:08PM
SAOImage DS9 version 7.4 is now
available for download at
http://ds9.si.edu/site/Download.html .
New features include Blocking, 3D Axes
Reorder, and Performance Improvements. 		 
1218 0
By: joye
12/21/2015 09:08PM
Normal Topic
Problems with Standard and Calibrate ...Started by:Marckelson, 11/20/2015 06:58PM
Hi there,

I'm actually working on xshooter
long-slit and ifu data. Regarding to
long-slit, everything is done by the
pipeline provided by ESO, but ifu data
is just reduced, ESO doesn't provide a
recipe to perform the ifu flux
calibration so I thought... 		 
1225 0
By: Marckelson
11/20/2015 06:58PM
Normal Topic
IRAF question concerning sbandsStarted by:valdes, 11/05/2015 07:01PM
Hello,

I have a student using IRAF to compute
photometry in various bands from the
spectrum of an object. She has an
optical spectrum and is trying to
compute the color (B-V) from the
spectrum using the Johnson filter
response. She has a file with ... 		 
975 0
By: valdes
11/05/2015 07:01PM
Normal Topic
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 0
By: kirankumar
09/17/2015 02:45PM
Normal Topic
a problem with daophotStarted by:wuxiaohan, 07/06/2015 09:22AM
Hello,
I want to make a CMD for NGC419. I went
through daofind, phot, psf, and allstar.
Then I matched the stars using the Linux
program "match". But when I plotted the
CMD with the Matlab function scatter, it
looked very strange. When I magnified
the ... 		 
876 0
By: wuxiaohan
07/06/2015 09:22AM
Normal Topic
Problems with ESOHDR and/or MSCRED?Started by:astroroger, 07/01/2015 06:10PM
Hello - I have some images from the ESO
WFI 2.2m and I'm trying to run esohdr to
convert the headers into standard .fits
format as needed for mosaic processing.
When I try to run esohdr on a list of
(unprocessed) .fits images, the
following error occur... 		 
1000 0
By: astroroger
07/01/2015 06:10PM
Normal Topic
problem with apflattenStarted by:thsyu, 03/10/2015 01:32AM
Hi!

I'm attempting to normalize my ESI flats
(10 orders) with apflatten, using a
trace as defined by a bright hot rotator
star. We fit a high order polynomial to
the extracted flat field spectrum, and
my problem is that my resultant
normalized flat i... 		 
1101 0
By: thsyu
03/10/2015 01:32AM
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