frb.dm.host

Methods related to DM in FRB Host Galaxies

frb.dm.host.dm_host_from_Halpha(z: float, Halpha: Quantity, reff_ang: Quantity, AV: float = None)[source]

Estimate DM_Host from Halpha and angular size (and redshift)

Args:

  • z (float) – Redshift

  • Halpha (Quantity) – Total Halpha flux of the galaxy

  • reff_ang (Quantity) – Galaxy angular size

  • AV (float, optional) – Correct for dust if provided

Returns:

DM_host as observed (i.e. includes the 1/1+z term)

Return type:

Quantity

frb.dm.host.dm_host_from_ssfr(z: float, ssfr: Quantity)[source]

Estimate DM_host from the surface density of SFR

Args:

  • z (float) – Redshift

  • ssfr (Quantity) – Surface density of SFR (with units)

Returns:

DM_host as observed (i.e. includes the 1/1+z term)

Return type:

Quantity

frb.dm.host.dm_host_halo(R: Quantity, log10_Mstar: float, z: float, HMR: str = 'Moster', mNFW: ModifiedNFW = None)[source]

Calculate the DM contribution from the host galaxy’s halo

Args:

  • R (Quantity) – Projected radial distance from the center of the halo

  • log10_Mstar (float) – Logarithm (base 10) of the stellar mass of the host galaxy

  • z (float) – Redshift of the host galaxy

  • HMR (str, optional) – Halo mass relation to use (‘Moster’ or ‘Kravstov’). Default is ‘Moster’

  • mNFW (models.ModifiedNFW, optional) – Instance of the ModifiedNFW model. If None, a default model will be created. Default is None

Returns:

DM contribution from the host galaxy’s halo

Return type:

Quantity

Raises:

IOError – If the specified halo mass relation (HMR) is not supported