nirdust 0.0.1

Measure temperature of hot dust in type 2 AGN

[](https://travis-ci.com/Gaiana/nirdust) [](https://github.com/leliel12/diseno_sci_sfw) [](https://nirdust.readthedocs.io/en/latest/?badge=latest)

# Nirdust: Near Infrared Dust Finder

Nirdust is a python package that uses K-band (2.2 micrometers) spectra to measure the temperature of the dust heated by an Active Galactic Nuclei (AGN) accretion disk.

## Motivation:

K-band nuclear spectral continuum of Type 2 AGNs is often composed of two components: the stellar population emission and a hot 800 - 1600 K dust component. Via subtraction of the stellar emission dust component fitting can be performed to map its presence and estimate its temperature.

## Features

The package uses the modeling features of astropy to fit the hot dust component of a AGN K-band spectrum with black body functions. And provide a class with methods for spectrum manipulation and normalized-blackbody-fitting. Because Nirdust normalizes the spectra before fitting, is not necessary to flux-calibrate spectra to use it.

Nirdust needs a minimum of two spectra to run: a nuclear one, where the dust temperature will be determined, and an off-nuclear spectrum, where the emission is considered to be purely stellar. The off-nuclear spectrum will be used by Nirdust to subtract the stellar emission from the nuclear spectrum.

Footnote: the hot dust component may or may not be present in your type 2 nuclei, do not get disappointed if Nirdust finds nothing.

## Requeriments

You will need Python 3.8 or 3.9 to run Nirdust.

## Installation

Clone this repo and then inside the local directory execute

` python $ pip install -e . `

Authors: Gaia Gaspar, José Alacoria.