CALZETTI00_ATTEN

Name

CALZETTI00_ATTEN

Purpose

Generates attenuation values at the input wavelengths using the Calzetti et al. (2000) attenuation curve or its modified version. Besides the normalization in the standard Calzetti curve, the modified version includes a variable slope as described in Noll et al. (2009), an optional 2175 Angstrom bump feature specified in Kriek & Conroy (2013), and birth cloud attenuation as described in Eufrasio et al. (2017).

Calling Sequence

exp_neg_tau = calzetti00_atten(wave [, tauV_diff = , delta = , $
                               tauV_BC = , /uv_bump, /error_check])

Input

waveint, float, or double array(Nwave)

The wavelength at which to determine the attenuation \([\mu \rm m]\).

Optional Inputs

tauV_diffint, float, or double array(Nmodels)

The V-band optical depth of the diffuse dust. (Default = 1.d0)

deltaint, float, or double array(Nmodels)

The power law value to change the attenuation curve slope. (Default = 0.d0)

tauV_BCint, float, or double array(Nmodels)

The V-band optical depth of the birth cloud. (Default = 0.d0)

uv_bumpflag

If set, then a 2175 Angstrom UV bump feature will be added to the attenuation curve.

error_checkflag

If set, all inputs are checked for errors. Otherwise, all inputs are assumed to be of correct format.

Output

exp_neg_taudouble array(Nwave, Nmodels)

The attenuation in terms of \(e^{-\tau}\) (i.e., \(e^{-\tau} = 10^{-0.4 A_{\lambda}}\)).

Note

Defaults will only be set if the optional error_check input is set.

References

• Calzetti, D., Armus, L., Bohlin, R. C., et al. 2000, ApJ, 533, 682

• Noll, S., Burgarella, D., Giovannoli, E., et al. 2009, A&A, 507, 1793

• Kriek, M., & Conroy, C. 2013, ApJ, 775, L16

• Eufrasio, R. T., Lehmer, B. D., Zezas, A., et al. 2017, ApJ, 851, 10

Modification History

• 2016/05/01: Created (Rafael T. Eufrasio)

• 2020/05/06: Added ability to run with pure Calzetti curve (Keith Doore)

• 2022/03/15: Added proper error handling (Keith Doore)

• 2022/03/15: Renamed variables to standard format (Keith Doore)

• 2022/03/15: Cleaned up method for separating pure and modified Calzetti (Keith Doore)

• 2022/03/18: Updated documentation (Keith Doore)

• 2022/04/07: Allowed for inputs to have degenerate dimensions (Keith Doore)

• 2022/04/07: Allowed for inputs to be scalars (Keith Doore)

• 2022/04/07: Allowed integer inputs (Keith Doore)

• 2022/04/07: Made optical depths positive input values (Keith Doore)

• 2022/04/07: Allowed for array of only one optional input to be given (Keith Doore)

• 2022/06/09: Changed no_bump keyword to uv_bump keyword and adjusted logic accordingly (Keith Doore)

• 2022/06/09: Added error_check keyword to do error handling (Keith Doore)

• 2022/11/04: Corrected extrapolation below 0.12um to use method from Noll+2009 (Keith Doore)