@joaoalves

Prof @univienna Fellow @RadInstitute Astrophysics, mostly

 Vienna, Austria
joaoalves.org
Joined November 2007
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Sco-Cen is the closest stellar nursery (~150 pc), typically divided into 3 clusters (Upper-Sco, UCL, and LCC). Sigma finds 37. We compare our results to the @ESAGaia post-DR2 literature, but we might miss someone, let us know. Image credit: IRAS/T. Preibisch
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The SigMA algorithm outperforms HDBSCAN, distinguishing clusters with velocity differences down to about 0.5 km/s and cluster volume densities as low as 0.01 sources/pc^3. An application to Sco-Cen reveals about 13000 young sources arranged in 37 clusters.
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Replying to @SRatzenbock
@SRatzenbock from @univienna @dsUniVie new clustering method "Significance Mode Analysis" (SigMA) to extract co-spatial and co-moving stellar populations from large-scale surveys, like @ESAGaia (in 5D), is on astroph (not yet accepted, comments welcome). arxiv.org/abs/2211.14225
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Want to join a research team that will measure the 3D motion of the Local Interstellar Medium for the first time? Understand our path through the Galaxy? Last week to apply for a @ERC_Research 5-year PostDoc position at @univienna jobregister.aas.org/ad/383ef…
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Happening now in sunny Vienna
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One can appreciate Josefa's main result in Fig 10 (interactive) by sliding back and forth in time (link to interactive Fig in the caption). This result would not have been possible without the ridiculous precision of @ESAGaia @univienna @oeaw
João Alves @[email protected]@joaoalves12 Mar 2021
Josefa Großschedl's last PhD thesis paper: interstellar gas and star formation in Orion are *profoundly* affected by feedback. Both the distribution and the dynamics of the gas and young stars carry the memory of a big blast that took place ~6 Myr ago (the Orion-BB event)
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This is the Radcliffe Wave, for those who asked: sites.google.com/cfa.harvard… @univienna @RadInstitute
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Even after 10 years, I still have a hard time believing this is my commute to work @univienna #ViennaObservatory
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Replying to @BQErwinChen @BoquanC
A quick look 30 min after the data release (by Josefa Großschedl, below) suggests we will be able to (finally) measure the distance between NGC1980 and the ONC (and the consequences of it). Place your bet: A) ui.adsabs.harvard.edu/abs/20… or B) ui.adsabs.harvard.edu/abs/20…
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Orion A cloud young stars in Gaia DR2 and Gaia EDR3. Flip between the two, and cry... Thank you @ESAGaia #GaiaDPAC, and the 400 scientists in Europe that make this mission a dream come true ♥️#ViennaObservatory @univienna Josefa was right! ui.adsabs.harvard.edu/abs/20…
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