HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.

Search:

[Advanced Search]



next up previous contents Xspec Home Page
Next: Tcl Scripts Up: Setting Commands Previous: xsect


xset

set variables for XSPEC models

Modify a number of XSPEC internal switches.

Syntax: xset [abund |cosmo |delta |mdatadir |method |seed |statistic |usechainrule |weight |xsect |<string_name>] [ <options>|<string_value>]

The arguments abund, cosmo, method, statistic, weight, and xsect just run the appropriate XSPEC commands. mdatadir changes the directory in which XSPEC searches for model data files. You probably don't want to change this. The seed option requires an integer argument, which will then be used to immediately re-seed and re-initialize XSPEC's random-number generator.

The delta option is for setting fit delta values (see the newpar command) which are proportional to the current parameter value rather than fixed. For example, 

XSPEC12> xset delta .15
will set each parameter fit delta to .15 * parVal. To turn proportional deltas off and restore the original fixed deltas, set delta to a negative value or 0.0. The current proportional delta setting can be seen with show control.

The usechainrule option can be used to switch between the fast (usechainrule yes) and slow (usechainrule no) options when calculating the derivatives of the fit statistic.

The <string_name> option can be used to pass string values to models. XSPEC maintains a database of <string_name>, <string_value> pairs created using this command. Individual model functions can then access this database. Note that xset does no checking on whether the <string_name> is used by any model so spelling errors will not be trapped.

To access the <string_name>, <string_value> database from within a model function use the fortran function fgmstr. This is defined as character*128 and takes a single argument, the string name as a character*128. If the <string_name> has not been set then a blank string will be returned.

The current <string_name> options, models to which they apply and brief descriptions are given in the following table :

APECROOT or SPEXROOT (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)expcheb6, (b)(v)(v)gadem, (v)mekal, mkcflow, nlapec, (b)snapec, (b)(v)(v)tapec, vmcflow Switch from default APEC or SPEX input files.
APECTHERMAL or SPEXTHERMAL (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Thermally broaden emission lines in APEC or SPEX input files.
APECVELOCITY or SPEXVELOCITY (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Velocity broaden emission lines in APEC or SPEX input files.
APECMINFLUX or SPEXMINFLUX (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Set minimum flux for line broadening when using APEC or SPEX input files.
APECBROADPSEUDO or SPEXBROADPSEUDO (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Broaden pseudo-continuum lines when using APEC or SPEX input files.
APECNOLINES or SPEXNOLINES (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Continuum only when using APEC or SPEX input files.
APEC_TRACE_ABUND or SPEX_TRACE_ABUND (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Set trace element abundances when using APEC or SPEX input files.
APECLOGINTERP or SPEXLOGINTERP (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Use logarithmic interpolation between tabulated temperatures when using APEC or SPEX input files.
APECMULTITHREAD or SPEXMULTITHREAD (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Parallelize over temperatures when calculating the lines in the spectrum using the APEC or SPEX input files.
APECEEBREMSS or SPEXEEBREMSS (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)equil, (b)(v)expcheb6, (b)(v)(v)gadem, (b)(v)(v)gnei, (v)mekal, mkcflow, (b)(v)(v)nei, nlapec, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov, (b)snapec, (b)(v)(v)tapec, vmcflow Include calculation of the e-e bremsstrahlung when using the APEC or SPEX input files.
APECUSESPEX (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)(v)cie, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)expcheb6, (b)(v)(v)gadem, (v)mekal, mkcflow, nlapec, (b)snapec, (b)(v)(v)tapec, vmcflow Switch from APEC to SPEX input files but apply all other APEC settings.
APECUSENEI (b)(v)(v)apec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (b)(v)cempow, (b)(v)cheb6, (b)(v)coolflow, (b)(v)(v)dem, (b)(v)expcheb6, (b)(v)(v)gadem, (v)mekal, mkcflow, nlapec, (b)snapec, (b)(v)(v)tapec, vmcflow Use NEI code to calculate CEI spectra.
NEIAPECROOT (b)(v)equil, (b)(v)(v)gnei, (b)(v)(v)nei, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov Switch from default NEIAPEC input files.
NEIVERS (b)(v)equil, (b)(v)(v)gnei, (b)(v)(v)nei, (b)(v)(v)npshock, (b)(v)(v)pshock, (b)(v)(v)rnei, (b)(v)(v)sedov Set version of NEI calculations.
POW_EMIN, POW_EMAX powerlaw, bknpower, bkn2pow, cutoffpl Switch to normalize to a flux calculated over an energy range.
CFLOW_VERSION mkcflow, vmclow Switch CFLOW version number.
CFLOW_NTEMPS mkcflow, vmclow Switch number of temperature bins used in CFLOW model.
SUZPSF-IMAGE suzpsf Set image file to be used for surface brightness.
SUZPSF-RA suzpsf Set RA for center surface brightness map which is taken from the WMAP.
SUZPSF-DEC suzpsf Set Dec for center surface brightness map which is taken from the WMAP.
SUZPSF-MIXFACT-IFILE# suzpsf Set filename to read mixing factors.
SUZSF-MIXFACT-OFILE# suzpsf Set filename to write mixing factors.
XMMPSF-IMAGE xmmpsf Set image file to be used for surface brightness.
XMMPSF-RA xmmpsf Set RA for center surface brightness map which is taken from the WMAP.
XMMPSF-DEC xmmpsf Set Dec for center surface brightness map which is taken from the WMAP.
XMMPSF-MIXFACT-IFILE# xmmpsf Set filename to read mixing factors.
XMMPSF-MIXFACT-OFILE# xmmpsf Set filename to write mixing factors.
NSA_FILE nsa Change filename used for model data.
NSAGRAV_DIR nsagrav Change directory used for model data files.
NSMAX_DIR nsmax Change directory used for model data files.
ZXIPCF_DIR zxipcf Change directory used for model data files.

Examples: 

XSPEC12> xset neivers 2.0
   // Set the NEIVERS variable to 2.0
XSPEC12> xset 
   // List the current string variables
XSPEC12> xset apecroot /foo/bar/apec_v1.01
   // Set the APECROOT variable
XSPEC12> xset seed 1515151
   // Re-initialize the pseudo random-number generator
   // with the seed value 1515151

next up previous contents Xspec Home Page
Next: Tcl Scripts Up: Setting Commands Previous: xsect
HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public
Last modified: Friday, 23-Aug-2024 13:20:40 EDT

HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.