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start [2018/03/06 02:21] – [Interactive Access] intema | start [2019/02/19 09:22] – [LOFAR Sky Model Creator] intema |
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News will be posted here and on our [[https://www.facebook.com/TGSSADR/|Facebook page]]. | News will be posted here and on our [[https://www.facebook.com/TGSSADR/|Facebook page]]. |
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| * 22-Aug-2018: Since 1-2 weeks there have been some issues with the VO server where TGSS ADR is hosted. As a result, also NASA SkyView has not been working correctly for TGSS ADR. Please know that the problem is being addressed, and SkyView is expected to properly work again in a matter of days. |
* 01-Dec-2017: A special version of TGSS ADR1 has been combined with NVSS to create a spectral index map and catalog of approx. 80 percent of the radio sky. The public data release page is found [[spidx|here]]. | * 01-Dec-2017: A special version of TGSS ADR1 has been combined with NVSS to create a spectral index map and catalog of approx. 80 percent of the radio sky. The public data release page is found [[spidx|here]]. |
* 15-Nov-2016: The TGSS-based LOFAR Sky Model Creator now has a flux cutoff option to exclude sources below a certain threshold. This can be used to speed up the initial calibration by using fewer model sources. | * 15-Nov-2016: The TGSS-based LOFAR Sky Model Creator now has a flux cutoff option to exclude sources below a certain threshold. This can be used to speed up the initial calibration by using fewer model sources. |
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The TGSS ADR survey products are hosted by the ASTRON virtual observatory (VO) system. This system complies with the VO standard and can be accessed directly by tools like [[http://www.star.bris.ac.uk/~mbt/topcat/|TOPCAT]]. The VO system provides three services, for which web-based interfaces are available: | The TGSS ADR survey products are hosted by the ASTRON virtual observatory (VO) system. This system complies with the VO standard and can be accessed directly by tools like [[http://www.star.bris.ac.uk/~mbt/topcat/|TOPCAT]]. The VO system provides three services, for which web-based interfaces are available: |
* [[http://vo.astron.nl/tgssadr/q_fits/imgs/form|TGSSADR Image Archive]] containing 5336 mosaic images of 5x5 square degrees covering the survey area. | * [[https://vo.astron.nl/tgssadr/q_fits/imgs/form|TGSSADR Image Archive]] containing 5336 mosaic images of 5x5 square degrees covering the survey area. |
* [[http://vo.astron.nl/tgssadr/q_fits/cutout/form|TGSSADR Image Cutout Service]] provides cutout images of up to 1x1 square degrees anywhere in the survey area. | * [[https://vo.astron.nl/tgssadr/q_fits/cutout/form|TGSSADR Image Cutout Service]] provides cutout images of up to 1x1 square degrees anywhere in the survey area. |
* [[http://vo.astron.nl/tgssadr/q/cone/form|TGSSADR Source Catalogue]] provides access to the 0.63 Million radio source catalog extracted from the full survey area. | * [[https://vo.astron.nl/tgssadr/q/cone/form|TGSSADR Source Catalogue]] provides access to the 0.63 Million radio source catalog extracted from the full survey area. |
The VO service links are given here: | The VO service links are given here: |
* [[http://vo.astron.nl/tgssadr/q/cone/scs.xml|TGSSADR VO Source Cone Search (SCS)]] | * [[https://vo.astron.nl/tgssadr/q/cone/scs.xml|TGSSADR VO Source Cone Search (SCS)]] |
* [[http://vo.astron.nl/tgssadr/q_fits/imgs/siap.xml|TGSSADR VO Simple Image Access (SIA)]] | * [[https://vo.astron.nl/tgssadr/q_fits/imgs/siap.xml|TGSSADR VO Simple Image Access (SIA)]] |
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The 5x5 square degree mosaic images that form the basis of TGSS ADR1 are available for direct download [[http://tgssadr.strw.leidenuniv.nl/mosaics/|here]] (5336 FITS images; 32 MB each). Note that there is a factor 3.6(!) redundancy in the sky coverage, mainly to guarantee up to 1x1 square degree cutouts anywhere in the survey area. | The 5x5 square degree mosaic images that form the basis of TGSS ADR1 are available for direct download [[http://tgssadr.strw.leidenuniv.nl/mosaics/|here]] (5336 FITS images; 32 MB each). Note that there is a factor 3.6(!) redundancy in the sky coverage, mainly to guarantee up to 1x1 square degree cutouts anywhere in the survey area. |
<code python> | <code python> |
import pyvo as vo | import pyvo as vo |
url = 'http://vo.astron.nl/tgssadr/q/cone/scs.xml' | url = 'https://vo.astron.nl/tgssadr/q/cone/scs.xml' |
t = vo.conesearch( url, pos = vo.object2pos( 'NGC 5939' ), radius = 30.0 ) | t = vo.conesearch( url, pos = vo.object2pos( 'NGC 5939' ), radius = 30.0 ) |
print t.votable | print t.votable |
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Created by Alex Mechev and Josh Albert (Leiden). | Created by Alex Mechev and Josh Albert (Leiden). |
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| **<color #ed1c24>NOTE THAT DUE TO A SERVER SOFTWARE UPGRADE THE NAME RESOLVE CURRENTLY DOES NOT WORK. \\ |
| ENTERING DIRECT RA,DEC COORDINATES DOES WORK.</color>** |
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You can use the TGSS ADR source catalog for generating a BBS-compatible Global Sky Model to calibrate your LOFAR data. Either fill out the form below, or run something like \\ | You can use the TGSS ADR source catalog for generating a BBS-compatible Global Sky Model to calibrate your LOFAR data. Either fill out the form below, or run something like \\ |
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