C. Morisset,1 G. Delgado-Inglada,1 and N. Flores-Fajardo2
1 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, C.P. 04510, México, D.F., México (gdelgado@astro.unam.mx, chris.morisset@gmail.com).
2 Department of Astronomy, Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China (nahieflores@gmail.com).
Received September 8 2014.
Accepted December 29 2014.
RESUMEN
Los modelos de fotoionización obtenidos mediante códigos numéricos son ampliamente utilizados para estudiar la física del medio interestelar (nebulosas planetarias, regiones HII, etc). Las redes de modelos de fotoionización se calculan para entender cuáles son los efectos que tienen sobre los parámetros observables que se utilizan para describir las nebulosas (principalmente intensidades de líneas). Con frecuencia, sólo se publica una parte de los resultados calculados con estas redes de modelos y, a veces, es difícil obtenerlos en un formato amigable. Aquí presentamos la base mexicana de datos del millón de modelos (3MdB), un esfuerzo para resolver ambos problemas mediante una base de datos de modelos de fotoionización, fácilmente accesible a través de un protocolo MySQL, y que contiene muchos parámetros de salida útiles, como las 178 intensidades de líneas de emisión, las fracciones iónicas de todos los iones, etc. Además presentamos algunos ejemplos prácticos de como usar 3MdB.
ABSTRACT
Photoionization models obtained with numerical codes are widely used to study the physics of the interstellar medium (planetary nebulae, HII regions, etc). Grids of models are performed to understand the effects of the different parameters used to describe the regions on the observables (mainly emission line intensities). Most of the time, only a small part of the computed results of such grids are published, and they are sometimes hard to obtain in a user-friendly format. We present here the Mexican Million Models database (3MdB), an effort to resolve both of these issues in the form of a database of photoionization models, easily accessible through the MySQL protocol, and containing a lot of useful outputs from the models, such as the intensities of 178 emission lines, the ionic fractions of all the ions, etc. Some examples of the use of the 3MdB are also presented.
Key Words: astronomical data bases — galaxies: ISM — HII regions — planetary nebulae.
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]]> ACKNOWLEDGMENT
CM, GDI and NFF acknowledge support from the Mexican project CONACyT CB-2010/153985. GDI gratefully aknowledges the DGAPA postdoctoral grant from the Universidad Nacional Autónoma de México. Many thanks to Grażyna Stasińska who kindly read and improved the manuscript. The authors gratefully acknowledge constructive comments from the referee.
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