Spacebuzz

Blog posts tagged with data

Posts in the past four weeks

Wednesday
Feb 10 2016
18:36 UTC

predictions for the LIGO event

... than 15 in the total data se

Posted by Hogg's Research

Wednesday
Feb 10 2016
04:59 UTC

why we do linear fitting; how to avoid computation

... #AstroHackNY, where we discuss data analysis and parallel work up at Columbia on Tuesday mornings. We discussed what we want to get out of the series, and started a discussion of why we do linear fitting the way we do, and what are the underlying assumptions. Prior to that, I talked with Hans-Walter Rix about interpolation and gridding of spectral models. We disagree a bit on the point of all this, but we are trying to minimize the number of stellar model evaluati

Posted by Hogg's Research

Tuesday
Feb 09 2016
02:05 UTC

star shades, data-driven redshifts

In a day limited by health issues, I had a useful conversation with Leslie Greengard and Alex Barnett (SCDA, Dartmouth) about star-shades for nulling starlight in future exoplanet missions. They had ideas about how the electromagnetic field might be calculated, and issues with what might be being done with current calculations of this. These calculations are hard, because the star-shades under discussion for deployment at L1 are many times 107 wavelengths in diameter, and millions of diameters

Posted by Hogg's Research

Saturday
Feb 06 2016
04:59 UTC

modeling spacecraft imaging

Dun Wang, Steven Mohammed (Columbia), David Schiminovich and I met to discuss GALEX. Wang has absolutely beautiful images of the GALEX flat, and he can possibly separate the flat appropriate for stars from the flat appropriate for background photons. We realized we might need some robust estimation to deal with transient reflections from bright stars. Matthew Penny (OSU) showed up and distracted us onto K2 matters; Penny is involved in our efforts to deliver photometry from the crowded fields o

Posted by Hogg's Research

Friday
Jan 29 2016
04:59 UTC

#AAAC, day 1

Today was day 1 of the two-day Astronomy and Astrophysics Advisory Committee (that advises NSF, NASA, and the DOE on places of intellectual and funding overlap). In the meeting (which is open to all by phone) I learned various things. One is that the LISA Pathfinder has successfully arrived at L1 and is apparently fully functional, including in its high-tech thruster system. The test masses are set to be released in weeks (if I remember correctly). John Carlstrom (Chicago) gave a nice presen

Posted by Hogg's Research

Wednesday
Jan 20 2016
04:59 UTC

galaxy redshift model of everything

... produced today a second draft of the chemical tagging paper. Boris Leistedt came by the SCDA and updated me on his SED and redshift model for photometric surveys. I hesitate to even call this “photometric redshifts” because the ambition is so much greater: It is to get the luminosity distribution, the redshift dependence, and the spectral energy distribution for every type of object on the sky, plus assign types and redshifts to all the sources in a multi-band survey (or collect

Posted by Hogg's Research

Friday
Jan 15 2016
04:59 UTC

data-driven model of supernova yields

... spent the last few days working on abundance-space structure, with some detours to hang out with colleagues in town for the Future of AI meeting at NYU, including Bernhard Schölkopf. Today Schölkopf and I spent some quality time today talking about our next round of projects, in two categories. In the first category, we talked about simple situations in astronomy in which independent components analysis might be useful. One is supernova yields: Jennifer Johnson (OSU) had asked me ...

Posted by Hogg's Research

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