Questions tagged [ds9]
Questions about the visualization tool for FITS images and data.
19
questions
2
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1
answer
98
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Measuring magnitudes in ds9
I'm currently working on a project which involves measuring several Cepheids to determine the distance to a galaxy. I have been using 12 images from the Hubble telescope taken over a period of about a ...
- 21
2
votes
0
answers
35
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ds9 configuration issue
I'm trying to use DS9 for X-ray image analysis. Before that I have to configure it for use, I need to click on option using web proxy.
Beside use internal web browser checkbox there should be another ...
- 21
1
vote
0
answers
129
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Split Multi-Extension fits file - fits.fz format
I have CFHT/MegaCam fits.fz file on which I want to do photometry. I want to split these large fits.fz file into separate CCD detector fits and then run Source Extractor on them for photometric ...
- 111
1
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1
answer
68
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What parameters about galaxies can be measured using SAO DS9?
I am trying to determine and plot various parameters for galaxies on SAO DS9. RA & dec, angular size to a fair extent, and contour plotting are a few of the aspects which I could determine using ...
- 627
1
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1
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109
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How is CASA different from SAO DS9?
I was told that CASA is used extensively in Radio Astronomy. However, softwares like SAO DS9 and also python (Astropy) are also used for radio astronomy data analysis. So, what makes CASA different as ...
- 627
4
votes
1
answer
209
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Flux density from brightness map
This is a naive question. I have a temperature map of radio emission at 1420 MHz, in Kelvin. I want to extract the flux density (in Janskys) from an extended region of this map.
Is the flux density ($...
- 73
2
votes
1
answer
258
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Align multiple fits images without WCS for future aperture photometry analysis
Recently I have got a bunch of raw fits images (2048x2048 pixels) of the same sky region without WCS to process in iraf. However, those images are not well-aligned. There would be around 4~5 pixels' ...
- 123
2
votes
1
answer
254
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How to convert from FELO-HEL to Km/s?
I am using DS9 to calculate the rotational velocity of a galaxy. I have 21cm cube and I used DS9 to plot this graph
I do not understand what is FELO-HEL! and I want to convert the units from FELO-...
- 35
1
vote
1
answer
141
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CoRoT FITS files read error
I downloaded fits file using wget script from https://exoplanetarchive.ipac.caltech.edu/docs/datasethelp/ETSS_CoRoT.html
I am not able to view the file. I tried atsromagic and DS9 . After File->Open ...
- 163
1
vote
1
answer
172
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Loading contour file in ds9
I have an ASCII file (.con) with the coordinates of vertices of different contours. This file is obtained from Matlab. Now after every set of contour ends there needs to be a blank row in the contour ...
- 43
5
votes
2
answers
356
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Excluding a rectangular region from an image in FITS
I am a complete beginner in astronomy. While learning DS9, I came up with the following question.
Say I want to exclude a boxed region from an image FITS. The corresponding parameters according to ...
- 153
1
vote
2
answers
269
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Determine distance from the galactic center in DS9
I have a list of coordinates of black hole/neutron star systems in decimal degrees (ie. {(266.416,-29.009), (266.418,-29.009),...} from DS9 and would like to determine the distance from SgrA* in ...
- 11
1
vote
0
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42
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help needed with inactivated option for wcs in SAO Image DS9
Another trouble in SAOImae DS9: with the Rotation Measure catalogue I have just downloaded: “Rotation measure image of the sky (Taylor+2009)”, even if I have set up the WCS to galactic before the ...
1
vote
1
answer
362
views
What unit is used for region Surface brightness in DS9?
The value of the surface brightness is in what unit? I hope it is in Rayleighs. Is that true?
2
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0
answers
300
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How to calculate angular size in ds9?
How to calculate the approximate angular (how many degrees across?) from an image in DS9 rendering?
1
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0
answers
461
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Galactic coordinates input in DS9
I have uploaded a h alpha photo in SAO Image DS9, but want to locate a particular region for which I have the galactic coordinates. How to input the coordinates in DS9 to view the particular zone?
1
vote
1
answer
2k
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how to get image coordinates of source points in saoimage ds9?
I loaded my fits image to saoimage ds9. Then, Analysis->Catalogs automatically brought up source locations. how can i get xy image coordinates of this source locations?
- 113
4
votes
1
answer
564
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Save current state in ds9?
After fooling around with a FITS file(s) (e.g. setting scale, changing color) is it possible to save the session such that there is a file associated with all those tweaks the next time I open it up?
...
- 1,518
6
votes
2
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499
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Adjust axis labels in ds9
How can I adjust the axis labels in ds9?
I'd like to have something like:
So far I only managed to get floating points (tl h%f3):
or the leading hours are missing (tl h%f1 m):
Edit:
I tried "tlhm....
