intergalactic 0.0.2

Galactic elements Q-Matrix generator

Intergalactic is a Q-Matrix generator.

Based on explicit values for solar abundances, z and IMF, Intergalactic calculates matrices Q(i,j) of masses of elements i ejected to the galactic medium as element j, for a complete range of stellar masses, accounting for supernovas of types Ia and Ib.

Intergalactic computes the contribution matrix of 15 elements:

H

D

He3

He4

C

C13

N

O

n.r.

Ne

Mg

Si

S

Ca

Fe

Installation

The easiest way to install it is using pip:

$ pip install intergalactic

This will also install some dependencies: numpy and yaml

Usage

Use intergalactic running:

$ intergalactic --config FILENAME

where FILENAME is the path to the config yaml file.

Running intergalactic will produce a directory with three output files:

• mass_intervals: all the mass intervals used to integrate for all the mass range

• imf_supernova_rates: the initial mass functions for the supernova rates for each mass interval

• qm-matrices: the Q(m) matrices for every mass interval defined in the mass_intervals file

Input params

Intergalactic reads a config file where several options can be set in yaml format:

input_params:
    z: 0.0200               # metallicity
    sol_ab: ag89            # solar abundances
    imf: kroupa             # initial mass function
    m_max: 40               # max value for stellar mass
    binary_fraction: 0.05   # rate of binary stars
    sn_ia_selection: rpl    # supernova imf

If no values are provided Intergalactic will use its internal default values for all params.

Initial mass function

The imf param in the config file can be set to use any of the predefined IMFs from different papers/authors:

salpeter:

Salpeter 1955

starburst:

Starburst 1999

miller_scalo:

Miller & Scalo 1979

ferrini:

Ferrini, Palla & Penco 1998

kroupa:

Kroupa 2002

chabrier:

Chabrier 2003

maschberger:

Maschberger 2012

The default value is kroupa. If you want to use your own IMF you can do so subclassing the IMF class.

Solar abundances

The sol_ab param in the config file can be set to use any of the available abundances datasets from different papers/authors:

ag89:

Anders & Grevesse 1989

gs98:

Grevesse & Sauval 1998

as05:

Asplund et al. 2005

as09:

Asplund et al. 2009

he10:

Heger 2010

The default value is as09. If you want to use your own abundances data you can do so subclassing the Abundances class.

License

Copyright © 2019 Juanjo Bazán, released under the MIT license.

Credits

Intergalactic is built upon a long list of previous works from different authors/papers:

• Ferrini et al.,1992, ApJ, 387, 138

• Ferrini & Poggiantti, 1993, ApJ, 410, 44F

• Portinari, Chiosi & Bressan.,1998,AA,334,505P

• Galli et al., 1995, ApJ, 443, 536G

• Mollá et al, 2015, MNRAS, 451, 3693-3708

• Iwamoto et al, 1999, ApJS, 125, 439

• Matteucci & Greggio, 1986, A&A, 154, 279M

• Mollá et al, 2017, MNRAS, 468, 305-318

• Gavilan, Mollá & Buell, 2006, A&A, 450, 509