yt.fields.xray_emission_fields module¶
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exception
yt.fields.xray_emission_fields.
EnergyBoundsException
(lower, upper)[source]¶ Bases:
yt.utilities.exceptions.YTException
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args
¶
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with_traceback
()¶ Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.
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exception
yt.fields.xray_emission_fields.
ObsoleteDataException
(table_type)[source]¶ Bases:
yt.utilities.exceptions.YTException
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args
¶
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with_traceback
()¶ Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.
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class
yt.fields.xray_emission_fields.
XrayEmissivityIntegrator
(table_type, redshift=0.0, data_dir=None, use_metals=True)[source]¶ Bases:
object
Class for making X-ray emissivity fields. Uses hdf5 data tables generated from Cloudy and AtomDB/APEC.
Initialize an XrayEmissivityIntegrator object.
- Parameters
table_type (string) – The type of data to use when computing the emissivity values. If “cloudy”, a file called “cloudy_emissivity.h5” is used, for photoionized plasmas. If, “apec”, a file called “apec_emissivity.h5” is used for collisionally ionized plasmas. These files contain emissivity tables for primordial elements and for metals at solar metallicity for the energy range 0.1 to 100 keV.
redshift (float, optional) – The cosmological redshift of the source of the field. Default: 0.0.
data_dir (string, optional) – The location to look for the data table in. If not supplied, the file will be looked for in the location of the YT_DEST environment variable or in the current working directory.
use_metals (boolean, optional) – If set to True, the emissivity will include contributions from metals. Default: True
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yt.fields.xray_emission_fields.
add_xray_emissivity_field
(ds, e_min, e_max, redshift=0.0, metallicity=('gas', 'metallicity'), table_type='cloudy', data_dir=None, cosmology=None, dist=None, ftype='gas')[source]¶ Create X-ray emissivity fields for a given energy range.
- Parameters
e_min (float) – The minimum energy in keV for the energy band.
e_min – The maximum energy in keV for the energy band.
redshift (float, optional) – The cosmological redshift of the source of the field. Default: 0.0.
metallicity (str or tuple of str or float, optional) – Either the name of a metallicity field or a single floating-point number specifying a spatially constant metallicity. Must be in solar units. If set to None, no metals will be assumed. Default: (“gas”, “metallicity”)
table_type (string, optional) – The type of emissivity table to be used when creating the fields. Options are “cloudy” or “apec”. Default: “cloudy”
data_dir (string, optional) – The location to look for the data table in. If not supplied, the file will be looked for in the location of the YT_DEST environment variable or in the current working directory.
cosmology (
Cosmology
, optional) – If set and redshift > 0.0, this cosmology will be used when computing the cosmological dependence of the emission fields. If not set, yt’s default LCDM cosmology will be used.dist ((value, unit) tuple or
YTQuantity
, optional) – The distance to the source, used for making intensity fields. You should only use this if your source is nearby (not cosmological). Default: Noneftype (string, optional) – The field type to use when creating the fields, default “gas”
will create at least three fields (This) –
(erg s^-1 cm^-3) ("xray_emissivity_{e_min}_{e_max}_keV") –
(erg s^-1) ("xray_luminosity_{e_min}_{e_max}_keV") –
(photons s^-1 cm^-3) ("xray_photon_emissivity_{e_min}_{e_max}_keV") –
if a redshift or distance is specified it will create two others (and) –
(erg s^-1 cm^-3 arcsec^-2) ("xray_intensity_{e_min}_{e_max}_keV") –
(photons s^-1 cm^-3 arcsec^-2) ("xray_photon_intensity_{e_min}_{e_max}_keV") –
latter two are really only useful when making projections. (These) –
Examples
>>> import yt >>> ds = yt.load("sloshing_nomag2_hdf5_plt_cnt_0100") >>> yt.add_xray_emissivity_field(ds, 0.5, 2) >>> p = yt.ProjectionPlot( ... ds, "x", ("gas", "xray_emissivity_0.5_2_keV"), table_type="apec" ... ) >>> p.save()