class Continuum and Line Analysis Single-dish Software - IRAM

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22 CHAPTER 3. USER MANUEL • METHOD HFS FileName This method is similar to the previous one, but the HyperFine Structure parameters are read from a file instead of being known by class . The first line of this file must contain the number of hyperfine components (< 40). The other lines must contain, for each component, the velocity offset and the relative intensity. The parameters are the same as for NH3 method. • METHOD CONTINUUM This method is used for continuum drifts. It fits a Gaussian and a linear baseline in the drift. If beam-switching was used and the reference beam is along the drift direction, two dependent Gaussian are used to optimize signal to noise. The method does not require any user input. METHOD SHELL in details. The fitted function is: where the fitted parameters are: f(ν) = A ∆ν 1. A: the area under the profile (in K MHz), 2. ν0: the middle frequency (in MHz), 3. ∆ν: the full width at zero level (in MHz), 1 + 4H [(ν − ν0)/∆ν] 2 1 + H/3 4. H: the Horn/Center parameter (dimensionless, see below) The central value is f(ν0) = A ∆ν 1 1+H/3 whilst the value at the edge is f(ν0+∆ν/2) = A ∆ν 1+H 1+H/3 . The edge-to-center intensity ratio value is thus dictated by the Horn/Center parameter H according to f(∆ν/2) f(0) = 1 + H The center-to-edge frequency shift corresponds to an expanding velocity vexp = c ∆ν/2 Figure 3.1 shows synthetic shell-like profiles, for which the area takes values A = 5 to 20 by 5 K MHz. The full width at zero level is ∆ν = 3.83 MHz in all cases, which corresponds to vexp = 2.49 km.s −1 at 230.537 GHz. The Horn/Center parameter is H = 5 (top) or H = −1 (bottom, for which the intensity at the edge is zero). The FIT commands are: • LINES N defines the number of components and prompts for the initial values of the parameters for each component. This command has no effect for method CONTINUUM. Parameters are read in list directed format in the following order: Code, Intensity, Code, Position, Code, Width, [Code, Parameter 4] The code is an integer number between 0 and 4. Note that, though the program works on the area (or other quantities as for NH3 methods), you have to give the intensity, since this quantity is more intuitive than area. The use of the list directed format makes things easier ν0
3.2. SPECTRA LINE PROCESSING 23 Figure 3.1: Four synthetic shell-like profiles, corresponding to increasing areas A = 5 to 20 by 5 K MHz, a ∆ν of 3.83 MHz or vexp = 2.49 km.s −1 at 230.537 GHz. The results of fitted shell profiles are indicated at the top. The upper scale is km.s −1 . T op: The Horn/Center parameter is H = 5. Bottom: Same as above for H = −1.
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138 INDEX MODIFY, 65 BANDS, 66 BEAM
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