Author: daniel_lenz

I've been working on the problem of computed the angular power spectrum for quite some time now, and nothing quite satisfied my needs. The problem is as follows: For a given map in the HEALPix format (Gorski+ 2005), the angular power spectrum of a map (or the cross power between two maps) needs to be … Continue reading The final take on angular power spectra in HEALPix? →

I just painfully became aware of the importance of adding the different profiles (.bashrc, .bash_profile, .ipython, etc.) to version control. To ignore all but a few relevant files in the home directory, I'd use following as .gitignore: * !*/ !.gitignore !.bash_profile !.jupyter/ !.ipython/ Moreover, I started to experiment a bit with extensions to jupyter through … Continue reading git for .profiles and nbviewer extensions →

The PyCon took place a few weeks ago in Portland, and I have yet to attend this conference for the first time. However, I found the slides very helpful and the videos and great to watch. In particular, I can recommend: The Keynote and python visualization landscape by Jake VanderPlas, who gave two great talks Introduction … Continue reading PyCon videos →

tl;dr: Link to paper & data at the bottom Over the past few months, Brandon Hensley, Olivier Doré, and myself have revisited the correlation between interstellar reddening by dust grains and the atomic neutral hydrogen column density. The basic idea is that HI and dust grains are well-mixed in the ISM and thus that HI can … Continue reading A new, large scale map of interstellar reddening →

This morning, my attention was brought to the new release of the Wisconsin H-Alpha Mapper Sky Survey (WHAM-SS), now covering the full sky at approximately 1 deg resolution, with velocities of +- 100 km/s and ~10 km/s spectral resolution. This first data release is only the start to further post-processing of the data, which will … Continue reading New WHAM-SS release →

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