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spidx [2017/11/30 13:14]
fdg
spidx [2018/03/13 13:33] (current)
intema [Acknowledgements]
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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 ======
  
 === Science team: Francesco de Gasperin (Leiden), Huib T. Intema (Leiden) & Dale A. Frail (NRAO) === === Science team: Francesco de Gasperin (Leiden), Huib T. Intema (Leiden) & Dale A. Frail (NRAO) ===
  
-We produced a spectral index catalog matching specially re-processed images from two radio surveys at different frequencies:​ NVSS and TGSS. These surveys were chosen because ​thy are the most sensitive metre and centimetre wavelength surveys currently available, they both cover a large fraction of the sky, and their separation in frequency provides a large lever arm for spectral index calculation. The resulting catalogue includes >1.4 million entries, making it the largest collection of spectral index information to date. Furthermore,​ we provide the community a spectral index map of 80% of the sky that can be used to classify radio sources.+We produced a spectral index catalog matching specially re-processed images from two radio surveys at different frequencies:​ NVSS and TGSS. These surveys were chosen because ​they are the most sensitive metre and centimetre wavelength surveys currently available, they both cover a large fraction of the sky, and their separation in frequency provides a large lever arm for spectral index calculation. The resulting catalogue includes >1.4 million entries, making it the largest collection of spectral index information to date. Furthermore,​ we provide the community a spectral index map of 80% of the sky that can be used to classify radio sources.
  
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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.
  
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 ===== Spectral index map ===== ===== 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: de Gasperin, Intema & FrailMNRAS, 474, 5008 (2018).
  
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spidx.1512047656.txt.gz · Last modified: 2017/11/30 13:14 by fdg