spidx
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spidx [2017/11/30 14:10] – intema | spidx [2022/07/25 13:46] (current) – fdg | ||
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{{ wiki: | {{ wiki: | ||
- | 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: | ||
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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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- 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; | + | Direct access through the web-based Aladin lite tool (limited functionality; |
- | * [[http:// | + | * [[http:// |
- | *[[http:// | + | * [[http:// |
- | * Download | + | |
+ | Alternatively, | ||
+ | |||
+ | Then use menu // | ||
+ | * [[http:// | ||
+ | * [[http:// | ||
- | For option 2, use menu // | + | Fits files are available |
- | | + | |
- | * [[http:// | + | |
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; | + | If you use resources listed in this page, please reference the paper: |
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spidx.1512051013.txt.gz · Last modified: 2017/11/30 14:10 by intema