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hi4pi [2023/04/11 15:25] Déborah Paradis |
hi4pi [2023/04/24 14:58] Déborah Paradis |
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| The equivalent width map is a linewidth metric, and is calculated as the integrated intensity divided by the peak brightness. It has units of ''km/s''. This is the rectangular width needed to supply the full line width at the peak intensity. A prefactor is then applied to recast as the equivalent sigma for the case of a Gaussian line profile. This is a highly robust statistic in the sense that it behaves well in the presence of noise or multiple components. It can easily miss subtleties in the line profile and has some dependence on spectral resolution. Not corrected for the line spread function (channel width + channel-to-channel correlation), nor for biases due to finite sensitivity. \\ | The equivalent width map is a linewidth metric, and is calculated as the integrated intensity divided by the peak brightness. It has units of ''km/s''. This is the rectangular width needed to supply the full line width at the peak intensity. A prefactor is then applied to recast as the equivalent sigma for the case of a Gaussian line profile. This is a highly robust statistic in the sense that it behaves well in the presence of noise or multiple components. It can easily miss subtleties in the line profile and has some dependence on spectral resolution. Not corrected for the line spread function (channel width + channel-to-channel correlation), nor for biases due to finite sensitivity. \\ | ||
| - | Healpix maps made by D. Paradis and A. Hughes. | + | Healpix maps made by A. Hughes and D. Paradis. |
| <html> | <html> | ||