analysis

Astrophysics Source Code Library (ASCL)

by Guest September 2, 2011

You don’t know me, but if you’ve written an astrophysics code useful for producing published results, I’d like to know you, or at least know of your code. I’m Alice Allen, primary editor of the Astrophysics Source Code Library (ASCL). The ASCL is a free online reference library of (wait for it…. ) …yes! Astrophysics [...]

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Visualizing Simulated Data

by Jessica June 9, 2011

More and more astronomers are writing, running, and using massive computer simulations. The complexity of these simulations (often 3D space + time) means that visualization can be challenging. Over at Astropython, they have posted about the - yt - toolkit that allows you to analyze and visualize the results of adaptive mesh refinement simulation codes (AMR). AMR [...]

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IRSA takes over Spitzer archive

by Guest April 14, 2011

Luisa Rebull is a Research Scientist at the Spitzer Science Center at the Infrared Processing and Analysis Center (IPAC) at Caltech. She is the Archive Scientist for Spitzer, and has been working on the development of the Spitzer Heritage Achive. There are two important recent developments in the Spitzer world: (1) the handover to IRSA [...]

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Wiki Upgrade and New Page on Stellar Evolution and Atmosphere Models

by Jessica April 1, 2011

Wiki Upgrade Some of you may have noticed that the wiki appearance has changed. This is because we have upgraded the wiki to the latest and greatest version of TikiWiki (6.2). Some of the functionality, especially wiki editing, should be greatly improved. We are still in the process of importing all of our stylistic customizations [...]

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How to Turn an ASCII Table into an SDSS spectrum? [Ask AstroBetter]

by Kelle January 18, 2011

[title revised Jan 19] Since Jane’s questions have proved to be very popular and useful posts, we’ve decided to make “Ask AstroBetter” a regular feature. Continuing on the theme of spectral analysis, Eilat asks, Is there a straightforward way to take a table of wavelength, flux, error spanning the same range as SDSS spectra and [...]

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Recent AstroStatistics Papers

by Jessica December 27, 2010

For many astronomers, statistics is an integral part of our analysis procedure; yet, we typically get very little formal training in this area. Recently, several astro-statistics papers have been posted on astro-ph that specifically address some of the unique attributes of astronomical data (small numbers of data points, frequent systematic errors or outliers, non-linear models, [...]

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Unintentional Biases, Band-Wagon Effects, and the Weaknesses of the Scientific Method

by Kelle December 17, 2010

Rethinking the scientific method | The New Yorker (subscription required, unfortunately) Extremely disturbing article about well-intentioned scientists’ experiments and conclusions gone awry. Most upsetting is the lack of reproducibility in many important studies and the likelihood that those works don’t get published. The disturbing implication of his study is that a lot of extraordinary scientific [...]

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Topcat: Leader of the Catalogue Manipulation Gang

by Guest September 20, 2010

This is a guest post—featuring our first screencast!—from Niall Deacon who studies brown dwarfs and white dwarfs in the Pan-STARRS survey at the University of Hawai`i. Niall also blogs about astronomy at weareallinthegutter. If you are drowning in search windows from different data archives and wasting time writing code to plot graphs of the simplest [...]

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Manipulating and Viewing FITS Files in Python with pyds9

by Jessica July 14, 2010

For anyone who uses python and ds9 to visualize their FITS files, I think pyds9 is now a must-have. It is officially written and developed through SAOImage ds9 so it will be supported for the long haul. Here are the primary links to get going: TARball for installation: Source Documentation for installation and use: Docs [...]

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Interpolation and Integration in Python

by Jessica June 14, 2010

Interpolation Interpolation is a used for many astronomical applications. Interpolation is required to combine sub-pixel dithered images or spectroscopy, sample grids of stellar evolution or stellar atmosphere models, calculate extinction from observed extinction curves, and many many more applications. The scipy.interpolate package in python has some nice built-in interpolation functions and I have gathered a [...]

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