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spidx [2017/11/30 13:15] fdgspidx [2022/07/25 13:46] (current) fdg
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 +{{htmlmetatags>metatag-keywords=(keywords>astronomy,radio,interferometry,galaxy,galaxies,agn,gmrt,giant,metrewave,telescope,tgss,adr,lofar,mwa,ska,ncra,nrao,astron,leiden,oxford,india,huib,intema,francesco,gasperin,dale,frail,pulsars,150,MHz,1.4,GHz,vla,nvss,megahertz,gigahertz,low,frequency,ionosphere,spam,sources,catalogs,aladin,hips,rms,sensitivity,mjy,vo,virtual,observatory,counts,steep,spectral,index,merging,galaxy,clusters,haloes,halos,relics,interactive,data,products,antenna,dish)}}
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 ====== TGSS-NVSS spectral index maps and catalog ====== ====== TGSS-NVSS spectral index maps and catalog ======
  
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 {{ wiki:cartoon.png }} {{ wiki:cartoon.png }}
  
-The final spectral index catalogue has 1 392 563 entries, of which 502,170 (36%) are full detections (source type: S, C, or M), 843,104 (61%) are lower limits (L), and 6,383 (<1%) are upper limits (U). Entries marked as island (I) are 40,906 (3%). The high number of lower limits is due to the higher sensitivity of NVSS with respect to TGSS.+The final spectral index catalogue has 1 396 515 entries, of which 503,647 (36%) are full detections (source type: S, C, or M), 845,459 (61%) are lower limits (L), and 6,386 (<1%) are upper limits (U). Entries marked as island (I) are 41,023 (3%). The high number of lower limits is due to the higher sensitivity of NVSS with respect to TGSS.
  
 The spectral index catalog can be downloaded here: The spectral index catalog can be downloaded here:
-  * [[http://tgssadr.strw.leidenuniv.nl/spidx/spidxcat_v1.1.fits|FITS]] (193 MB)+  * [[http://tgssadr.strw.leidenuniv.nl/spidx/spidxcat_v1.1b.fits|FITS]] (111 MB)
  
 Catalog columns: Catalog columns:
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 ^ Isl_id | -- | Island identification number | ^ Isl_id | -- | Island identification number |
 ^ Source_id | -- | Unique source identification number | ^ Source_id | -- | Unique source identification number |
 +Some notes are valid only for specific entry types as saved in the S_code column.
  
 ----- -----
 +
 ===== Spectral index map ===== ===== Spectral index map =====
  
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   - a spectral index error map for each //good// pixel that shows the standard deviation of the bootstrapped distribution.   - a spectral index error map for each //good// pixel that shows the standard deviation of the bootstrapped distribution.
  
-  * Direct access through the web-based Aladin lite tool (limited functionality; pre-loaded images): +Direct access through the web-based Aladin lite tool (limited functionality; pre-loaded images): 
-    * [[http://tgssadr.strw.leidenuniv.nl/spidx/hips_spidx/|spectral index map]] +    * [[http://tgssadr.strw.leidenuniv.nl/hips_spidx/|spectral index map]] 
-    *[[http://tgssadr.strw.leidenuniv.nl/spidx/hips_spidxerr/|spectral index error map]] +    * [[http://tgssadr.strw.leidenuniv.nl/hips_spidxerr/|spectral index error map]] 
-   * Download and run the [[http://aladin.u-strasbg.fr/java/nph-aladin.pl?frame=downloading|Aladin Desktop tool]] (full functionality)+ 
 +Alternatively, download and run the [[http://aladin.u-strasbg.fr/java/nph-aladin.pl?frame=downloading|Aladin Desktop tool]] (full functionality) 
 + 
 +Then use menu //File->Open URL// and enter the following links: 
 +   * [[http://tgssadr.strw.leidenuniv.nl/hips_spidx/|http://tgssadr.strw.leidenuniv.nl/hips_spidx/]] to load the spectral index images  
 +   * [[http://tgssadr.strw.leidenuniv.nl/hips_spidxerr/|http://tgssadr.strw.leidenuniv.nl/hips_spidxerr/]] to load the spectral index error images.
  
-For option 2, use menu //File->Open URL// and enter the following links: +Fits files are available [[https://tgssadr.strw.leidenuniv.nl/spidx/fits/ | here]].
-   [[http://tgssadr.strw.leidenuniv.nl/spidx/hips_spidx/|http://tgssadr.strw.leidenuniv.nl/spidx/hips_spidx/]] to load the spectral index images  +
-   * [[http://tgssadr.strw.leidenuniv.nl/spidx/hips_spidxerr/|http://tgssadr.strw.leidenuniv.nl/spidx/hips_spidxerr/]] to load the spectral index error images+
  
 Two examples of the radio spectral index map produced matching pixel-by-pixel the NVSS and the TGSS maps. Left is the NVSS image, right the TGSS image, at the centre we show the spectral index map: Two examples of the radio spectral index map produced matching pixel-by-pixel the NVSS and the TGSS maps. Left is the NVSS image, right the TGSS image, at the centre we show the spectral index map:
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 ===== Acknowledgements ===== ===== Acknowledgements =====
  
-If you use the resources listed in this page, please reference the paper: de Gasperin, Intema & Frail (2017; MNRAS)+If you use resources listed in this page, please reference the paper: [[https://ui.adsabs.harvard.edu/abs/2018MNRAS.474.5008D/abstract|de Gasperin, Intema & FrailMNRAS, 474, 5008 (2018)]].
  
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spidx.1512047704.txt.gz · Last modified: 2017/11/30 13:15 by fdg