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| ULY_SSP | Define a SSP component |
| ULY_SSP_ALLOC ULY_SSP_FREE | Allocate/free a structure containing the stellar population models |
| ULY_SSP_CHCK | Check if a model grid matchs specifications given in keywords |
| ULY_SSP_EXTR | Interpolate in the model grid to extract a spectrum |
| ULY_SSP_INIT | Initialize a SSP component |
| ULY_SSP_INTERP | Get interpolated spectrum for logT, Met and [Mg/Fe] |
| ULY_SSP_READ | Read a grid of population model and sample it according to |
| ULY_SSP_WRITE | Write a SSP model grid to a FITS file |
NAME: ULY_SSP PURPOSE: Define a SSP component USAGE: cmp = uly_ssp(MODEL_FILE=model_file, DATA=template_grid, LSF=lsf_file, AL=a_limits, ZL=z_limits, MGFEL=mg_limits, AG=a_guess, ZG=z_guess, MGFEG=mg_guess, NAME=name, FIXPAR=fixpar, WL=lim_weight) DESCRIPTION: Return a CMP structure describing a SSP component that can be passed to the program ULYSS. A SSP is a function of age, metallicity and possibly of [Mg/Fe]. The set of models is defined by MODEL_FILE, by default Pegase-HR models computed with ELODIE.3.1 and Salpeter IMF will be used. A list of the models included in the basic distribution of the package can be found on the models page. And other models can be downloaded from the same page. To define a n-bursts model use n times ULY_SSP and make an array of these cmp_n: cmp = [cmp_1, cmp_2,... cmp_n] Note that the SSP components are not obligarory SSPs, they may for example be population with constant SFR. They just depend at maximum on age, metallicity and [Mg/Fe]. (An exponentially decreasing SFR cannot be modeled with this CMP. KEYWORDS: MODEL_FILE: Name of the FITS file containing the SSP grid. Defaulted to models/PHR_Elodie31.fits (PEGASE_HR grid with Elodie.3.1 library). An alternative choice, provided in the distribution is to use the Vazdekis models build with the Miles library (uly_root+'/models/Vaz_Miles.fits'). DATA: This keyword is used for template model (input and output). Normally ULYSS reads the model grid specified with MODEL_FILE. If <template_grid> is the correct model for the required action, then it uses it without reloading. The same keyword is used for output of the loaded model, ie., you can set this keyword to an empty named variable where the loaded model will be stored. LSF: Name of the file containing a relative LSF to be injected in the template. AL: [Myr] default=limits of the grid Limits for the age. dblarr(2). ZL: [dex] default=limits of the grid dblarr(2). Limits for the metallicities. MGFEL: [dex] default=limits of the grid dblarr(2); Limits for [Mg/Fe]. AG: [Myr] default=8000 Guess for the age. This can be a scalar or an array. ZG: [dex] default=-0.4 Guess for the metallicity. This can be a scalar or an array. MGFEG: [dex] default=0.0 Guess for the [Mg/Fe]. This may be an array. NAME: Character string to name the component. By default a unique name is generated. FIXPAR: array[3], for [age, Fe/H, Mg/Fe] the elements which have to be fixed 0/1 - free/fixed WL: limits for the weight of each model component [min_w, max_w] The weight is in data units over component units. By default the weight is constrained to be positive, to suppress any constraint, set: WL=[-1,1]*machar(/DOUBLE)).xmax This constraint is ignored when ULySS fits a single component. EXAMPLE: To fit Vaz-Miles SSP with PHR-ELODIE cmp=uly_ssp() ulyss, uly_root+'/data/VazMiles_z-0.40t07.94.fits', cmp HISTORY: CREATION 2008/07/24 Mina Koleva
(See pgm/uly_ssp.pro)
NAME: ULY_SSP_ALLOC ULY_SSP_FREE PURPOSE: Allocate/free a structure containing the stellar population models USAGE: grid = uly_ssp_alloc() uly_ssp_free, grid DESCRIPTION: ULY_SSP_ALLOC allocates an empty structure. ULY_SSP_FREE frees an existing one. This structure has the same tags as the spect structure (see ULY_SPECT_ALLOC) plus some additional ones. Therefore, many functions designed to manipulate spect structures can be used, but notice that (i) these functions will not handle the specific tags and (ii) only ULY_SSP_FREE will correctly free the memory. The anonymous structure contains the following tags: title string Title, to be filled with the name of the grid hdr Array of character strings FITS style header, to be filled with the hdr of the grid start double precision Wavelength of the centre of the first pixel If 'sampling'=0, wavelength in Angstrom If 'sampling'=1, log(wavelength) (natural log) If 'sampling'=2, wavelength can not be described with start/step step double precision Wavelength step between two pixels If 'sampling'=0, in Angstrom If 'sampling'=1, logarithmic step If 'sampling'=2, not a constant step sampling integer Type of sampling scale 0 for linear in wavelength 1 for logarithmic scale 2 for non-constant step wavelen Wavelength array, relevant if sampling=2 waverange 2 elements vector The wavelength range for the data goodpix integer 1D array List of valid pixels data real array of dimension 3 or 4 Pointer on Array of the values of the flux err A pointer to null to make the structure compatible with 'spect' o_age Array of models' log(ages) o_metal Array of models' metallicities o_mgfe Array of models' [Mg/Fe], for a grid resolved in [Mg/Fe] d2t 3 or 4D array containing the 2nd time derivatives used for spline interpolation dof_factor Dummy varaible to make the structure compatible with 'spect' RETURN: empty model structure, to be filled with the (para)data of the models SEE ALSO: ULY_SPECT_ALLOC AUTHOR: Martin France, Mina Koleva, Philippe Prugniel CRAL-Observatoire de Lyon
(See pgm/uly_ssp_alloc.pro)
NAME: ULY_SSP_CHCK PURPOSE: Check if a model grid matchs specifications given in keywords USAGE: status = uly_ssp_chck(model_grid, $ WAVERANGE=waverange, VELSCALE=velscale, $ AGERANGE=agerange, METALRANGE=metalrange,$ MODEL_FILE=model_file, QUIET=quiet $ DESCRIPTION: Check if a grid of population models previously read (likely with ULY_SSP_READ) corresponds to some reading specification. This may save to reload it. This routine check if the model (MODEL_FILE, for example 'PHR_Elodie31.fits' or 'Vaz_Miles.fits'), WCS (waverange, velscale) or range of parameters (agerange, metalrange) match. This routine compares the characteristics of the model grid as they are stored in the structure (model_grid) with those specified in keywords If a model grid is passed in entry to ULY_SSP_READ through the keyword MODEL_FILE, the present routine is called to test if the grid is consistent with the other parameters. ARGUMENT: model_grid: input (not modified by this routine) Structure created by eg. uly_ssp_read and containing the model. If not give, ULY_SSP_CHCK returns 0. KEYWORD: The keywords are similar to those of ULY_SSP_READ WAVERANGE: (optional) Two element array giving the limits of the range to read, in Angstrom. For example WAVERANGE=[4000d,4786d]. By default the whole data range is read. VELSCALE: (optional) Size of the pixels in km/s. For example VELSCALE=30. If VELSCALE is not given, the models are not rebinned, ie. they are as stored in the disk file (in linear or log scale). AGERANGE, METALRANGE: (optional) Extracted region of the grid. Ages are in log(Myr) and metallicities in dex. By default the whole data range is read. For example AGERANGE=alog([100,15000]), METALRANGE=[-1.4,+0.7] MODEL_FILE: (string) Name of the file containing the grid of SSPs. QUIET: verbosity control RETURN: integer (model_reload): 1 if (model_grid) does not corresponds to the specifications 0 if (model_grid) corresponds to the specs EXAMPLE: Read a grid of Pegase-HR/Elodie with given wavelength, age and metallicity ranges: grid = uly_ssp_read(uly_root+'/models/PHR_Elodie31.fits', $ WAVERANGE=[4000d, 5500d], VELSCALE=30., $ AGERANGE=alog([20,2000]), METALRANGE=[-1.4,-0.1]) Check it if <grid> corresponds to the reading specifications: if uly_ssp_chck(grid, $ WAVERANGE=[4000d,5500d], VELSCALE=30, $ AGERANGE=[20, 2000], METALRANGE=[-1.4,-0.1], $ MODEL_FILE='models/PHR_elodie31.fits', /QUIET $ ) eq 1 then print, 'It is the correct grid!' DEPENDENCE: ULY_SSP_ALLOC.PRO AUTHOR: Antoine Bouchard, Philippe Prugniel
(See pgm/uly_ssp_chck.pro)
NAME: ULY_SSP_EXTR PURPOSE: Interpolate in the model grid to extract a spectrum USAGE: model = uly_ssp_extr(<galaxy>, <model_file>, <pars>, SIGMA=sigma, /QUIET) DESCRIPTION: Extract 1D spectrum from an interpolated grid of model spectra at a given age, metallicity and [Mg/Fe]. Rebin it according to the WCS of the input spectrum <galaxy> and cut it in the wavelength range of this latter spectrum. To simply interpolate a model at given age, metallicity and [Mg/Fe] first read the model grid with ULY_SSP_READ and after use the lower level function ULY_SSP_INTERP. ARGUMENT: <galaxy> filename or spectrum structure serving as a model for the WCS. <model_file> Identification of the model <pars> array of parameters of the model SSP ([age, met, mgf]) KEYWORD: SIGMA: Gaussian velocity dispersion in km/s, to convolve the model grid with when loading it. QUIET: Verbosity control. RETURNS: A 1D SSP spectrum as a spect structure, see ULY_SPECT_ALLOC EXAMPLE: To extract a model of PHR/Elodie with the same SSP equvalent age/metallicity like Vazdekis/Miles's model model = $ uly_ssp_extr(uly_root+'/data/VazMiles_z-0.40t07.94.fits', $ uly_root+'/models/PHR_Elodie31.fits', [7980, -0.38, 0]) DEPENDENCE: [uly_spect_read.pro], [uly_spect_alloc.pro], [uly_spect_logrebin.pro], uly_spect_get.pro, uly_spect_free.pro, uly_ssp_read.pro, uly_ssp_interp.pro HISTORY: Creation Mina Koleva 2008/03/11
(See pgm/uly_ssp_extr.pro)
NAME: ULY_SSP_INIT PURPOSE: Initialize a SSP component USAGE: cmp_new = uly_ssp_init(cmp, WAVERANGE=waverange, VELSCALE=velscale, QUIET=quiet) DESCRIPTION: This initialization function is automatically executed by ULY_FIT_INIT when a component has been defined using ULY_SSP (fit of a Single Stellar Population). This function is recorded in the member: cmp.init_fun of the component structure. The initialization consist in reading the grid of SSPs (ULY_SSP_READ) sample it according to WAVERANGE and VELSCALE and possibly inject the LSF. ARGUMENTS: cmp: a component defined using ULY_SSP (look its doc for more details) KEYWORDS: WAVERANGE: wavelength range for which the models are read VELSCALE: if this keyword is set the models are going to be rebined in log with a step in km/s equal to the velscale value QUIET: verbosity control DEPENDENCE: ULY_SSP_READ.pro HISTORY: creation PhP
(See pgm/uly_ssp.pro)
NAME: ULY_SSP_INTERP PURPOSE: Get interpolated spectrum for logT, Met and [Mg/Fe] USAGE: model_new = uly_ssp_interp(model_grid, para) DESCRIPTION: Interpolate spectrum from a grid of models at given log(age), [Fe/H] and [Mg/Fe]. Use ULY_2DERIV and INTERP_3D. Called, for example, from ULY_SSP_EXTR and ULY_FIT_LIN. ARGUMENTS: model_grid: Grid of model (structure) [x, y, mgfe]: Log of age (Myr); metallicity (dex); [Mg/Fe] RETURN: Interpolated spectrum (array) EXAMPLE: Read a model grid and then extract a spectrum at given 10 Gyr and solar metallicity model_grid=uly_ssp_read(uly_root+'/models/PHR_Elodie31.fits') model = uly_ssp_interp(model_grid, [alog(10000), 0.0]) AUTHOR: Philippe Prugniel
(See pgm/uly_ssp_interp.pro)
NAME: ULY_SSP_READ PURPOSE: Read a grid of population model and sample it according to specifications USAGE: grid = uly_ssp_read( model_file, $ TEMPLATE_GRID=template_grid, $ WAVERANGE=waverange, VELSCALE=velscale, $ AGERANGE=agerange, METALRANGE=metalrange, $ LSF=lsf_file, $ SIGMA=sigma, QUIET=quiet ) ARGUMENTS: model_file: Name of the FITS file where the model are read INPUT KEYWORDS: TEMPLATE_GRID (optional) If given, ULY_SSP_READ checks that its value is a model grid matching the description given through the other arguments (see ULY_SSP_CHCK). If the grid match those specification it is returned directly. Otherwise a new grid is read and returned. VELSCALE (optional) Size of the pixels in km/s. For example VELSCALE=30. If VELSCALE is not given, the models are not rebinned, ie. they are as stored in the disk file (in linear or log scale). WAVERANGE (optional) Two element array giving the limits of the range to read, in Angstrom. For example WAVERANGE=[4000d,4786d]. By default the whole data range is read. AGERANGE, METALRANGE (optional) Extracted region of the grid. Ages in log(Myr) and metallicities in dex. By default the whole data range is read. For example AGERANGE=alog([100,15000]), METALRANGE=[-1.4,+0.7] LSF_FILE (optional) Name of a file containing the LSF (see ULY_LSF and ULY_SSP_LSFCONVOL) to be injected in the grid. SIGMA (optional) If given, the models are convolved by a Gaussian whose standard deviation is SIGMA [km/s] /QUIET (optional) Verbosity control. RETURN: Structure containing the models grid. See ULY_SSP_ALLOC. In case of error, return the scalar value -1. DESCRIPTION: A grid of population model contains synthetic spectra at a sample of ages, metallicity and possibly [Mg/Fe]. It is used to generate a model at given age, metallicity and [Mg/Fe] by interpolation. The function ULY_SSP_READ returns a structure containing the grid and all its description (wcs, sampling points in age, metallicity ...). EXAMPLE: grid = uly_ssp_read(uly_root+'/models/PHR_Elodie31.fits', $ WAVERANGE=[4000d, 5500d], VELSCALE=30., $ AGERANGE=alog([12,20000]), METALRANGE=[-2.4,0.7]) grid = uly_ssp_read(uly_root+'/models/PHR_Elodie31.fits', VELS=30) AUTHORS: Philippe Prugniel, Martin France, Mina Koleva
(See pgm/uly_ssp_read.pro)
NAME: ULY_SSP_WRITE PURPOSE: Write a SSP model grid to a FITS file USAGE: uly_ssp_write, <model_grid>, <filename> ARGUMENTS: <model_grid> : Structure with the models (see ULY_SSP_READ) <filename> : Name of the output FITS file DESCRIPTION: Write the model structure <model_grid> into the file <filename> that can be used later with ULY_SSP_READ or to define a component with ULY_SSP. This function is in particular useful when a LSF has been injected in an original model in order to use this new model to analyse several spectra. Description of the model file: The data grid is stored as a N-dimensional array whose first dimension is the wavelength. The other dimensions are the axes of the models: AGE and METAL. The coordinates on the wavelength axis are described with a standard WCS, while for the other axese they are stored in extensions respectively named AGE and METAL. An additional extension, PARAM, if present, contains further information on each spectrum of the model (like flux in given bands or Lick indices) EXAMPLE: Read a grid, inject a LSF, write the modified grid grid = uly_ssp_read(uly_root+'/models/PHR_Elodie31.fits', VEL=30.) uly_spect_lsfconvol, 'lsf', grid uly_ssp_write, grid, 'convolved_grid.fits' The LSF file 'lsf' used above can be generated as: galaxy = uly_root+'/data/VazMiles_z-0.40t07.94.fits' model = uly_ssp_extr(galaxy, $ uly_root+'/models/PHR_Elodie31.fits' ,[8000.,-0.4,0.], SIG=30) cmp = uly_star(model) uly_lsf, galaxy, cmp, 200, 100, FIL='lsf', /QUIET HISTORY: creation Mina Koleva update Philippe Prugniel
(See pgm/uly_ssp_write.pro)
uly_html_help.| Contact: ulyss at obs.univ-lyon1.fr |
Last modified: Wed Feb 24 10:42:28 2016. |