Questions tagged [ds9]

Questions about the visualization tool for FITS images and data.

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4
votes
1answer
54 views

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 ($...
2
votes
1answer
44 views

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' ...
2
votes
1answer
67 views

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-...
1
vote
1answer
36 views

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 ...
1
vote
1answer
60 views

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 ...
4
votes
2answers
145 views

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 ...
1
vote
2answers
140 views

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 ...
1
vote
0answers
31 views

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
1answer
125 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?
1
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0answers
116 views

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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0answers
143 views

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
1answer
1k views

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?
4
votes
1answer
230 views

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? ...
7
votes
2answers
333 views

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....