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News

June 5th 2014: AtomDB 3.0.0 Beta 2 Released

The next iteration of the AtomDB Database has been released for beta testing. Details.

May 20th 2014: AtomDB ACX Model Posted

The AtomDB Charge Exchange model, ACX, version 1.0 has been posted. Details.

February 11th 2014: AtomDB Workshop and Workweek 2014

The 2014 AtomDB Workshop will be held at Tokyo Metroplitan University, Japan from September 6th-9th. Details.

September 23rd 2013: AtomDB NEI library libapecnei released

The AtomDB non-equilibrium ionization balance library has been released, allowing the NEI calculations without the overhead of the full APEC code. Full details are here.

July 23rd 2013: AtomDB iPad App Launched

There is now an iPad app for AtomDB, available in Apple App Store. More details here.


Project Quick Links

There are several different sub-projects under the AtomDB umbrella. These are:


What is AtomDB?

AtomDB is an atomic database useful for X-ray plasma spectral modeling. The current version of AtomDB is primarly used for modeing collisional plasmas, those where hot electrons colliding with astrophysically abundant elements and ions create X-ray emission. However, AtomDB is also useful when modeling absorption by elements and ions or even photoionized plasmas, where X-ray photons (often from a simple power-law source) interacting with elements and ions create complex spectra.

Our goal is to incorporate not only all relevant data, generated both from theoretical models and experiment, but also to critically evaluate this data to create recommended models. Each revision of the critically evaluated database is given a version number to aid reference.

The current release is version 2.0.0. This is a major update from version 1.3.2, with nearly all atomic data being replaced. Please see the the release notes for more details.

For interactive line lists and data, we provide the AtomDB WebGUIDE and an iPad app.


AtomDB provides improved spectral modeling capability through additional emission lines, accurate wavelengths for most strong X-ray transitions, and new density-dependent calculations. While many of the improvements are directed toward X-ray grating data analysis, some differences between AtomDB and other models might be noticeable even at moderate (CCD) resolution.

The atomic database AtomDB includes the Astrophysical Plasma Emission Database (APED) and the spectral models output from the Astrophysical Plasma Emission Code (APEC). The APED files contain information such as wavelengths, radiative transition rates, and electron collisional excitation rate coefficients. APEC uses these data to calculate plasma model spectra. The APEC output models in AtomDB are for optically-thin plasmas in collisional ionization equilibrium. APEC outputs separate continuum and line emissivity files, making it easy to model continuum and line emission separately as well as together.

The AtomDB is used by Sherpa, GUIDE and ISIS to identify emission lines and to calculate spectra for comparison with observations. All the files in the AtomDB are in FITS format, and can be easily read using the CIAO's Prism.

WARNING: There are a number of important caveats to this release. Despite the many improvements we have made, in some cases using the mekal or raymond models may be a better choice. Please read the caveats carefully!

If you use these models, please register so we can notify you when updates or corrections are made.

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