Extinction Curves

Few extinction curves have been included in speXtra

To list the names of the extinction curves included in the database

    from spextra import spextra_database
    spextra_database["extinction_curves"]

{'gordon': 'LMC and SMC extinction laws',
 'cardelli': 'MW extinction laws',
 'calzetti': 'extragalactic attenuation curves'}

Gordon

# Gordon LMC/SMC Extinctions Curves

name: gordon

title : EC for the Large and Small Magellanic Clouds

summary: |
  Extinction curves for Large and Small Magellanic Clouds

source : Gordon et al. 2003, ApJ, 594, 279

wave_unit : 1/um

extinction_unit : mag

wave_column : WAVELENGTH

extinction_column : Av/E(B-V)

data_type : fits

file_extension : .fits

curves: # comment
  lmc_30dor:  LMC Supershell 30Dor R_V = 2.76
  lmc_diffuse: LMC Average R_V = 3.41
  smc_bar: SMC Average R_V = 2.74

Cardelli

# Cardelli MW Extinctions Curves

name: cardelli

title : EC for the Milky Way

summary: |
  Extinction curves for the Milky Way

source : Cardelli, Clayton, & Mathis 1989, ApJ, 345, 245

wave_unit : 1/um

extinction_unit : mag

wave_column : WAVELENGTH

extinction_column : Av/E(B-V)

data_type : fits

file_extension : .fits

curves: # comment
  milkyway_dense :   R_V = 5.0
  milkyway_diffuse : R_V = 3.1
  milkyway_rv21 :    R_V = 2.1
  milkyway_rv4 :     R_V = 4.0

Calzetti

# Calzetti Extragalactic Extinction Curve

name: calzetti

title : EC for Starburst Appropriate for stellar continnum

summary: |
  Contains Extintion curve for Starbust Extintion/Attenuation law.
  This is an attenuation law; i.e. it has radiative transfer effects of
  mixing the stars & dust together which modifies the shape of the
  curve. These effects are not present in the other extinction laws
  as they are derived for single stars behind a screen of dust.

source : Calzetti et al. 2000. ApJ, 533, 682

wave_unit : Angstrom

extinction_unit : mag

wave_column : WAVELENGTH

extinction_column : Av/E(B-V)

data_type : fits

file_extension : .fits

curves: # comment
  starburst:  extragalactic starburst