@hydezero-message.bsky.socialPaid tutorial: estimate unseen masses with microlensing formulas, positional shifts, error propagation and observing times. Worked examples use a dark point lens, point source and no blended light; not a data reanalysis.
https://note.com/hydezero/n/nae96de6fc159?hl=en
#Astrophysics #Microlensing
@hydezero-message.bsky.socialA long microlensing event need not mean high mass. Read Huston et al.’s OGLE/MOA and Keck analysis: 3 targets are not black holes; OB150211 is a weak candidate. Parallax, blending and priors matter.
https://note.com/hydezero/n/n8999a3b8fadc?hl=en
#Astrometry #Microlensing
@hydezero-message.bsky.socialPaid guide: derive microlensing mass, error propagation and observing times for a dark point lens, point source and no blending. Work through teaching examples inspired by Huston et al.; this is not a data reanalysis.
https://note.com/hydezero/n/nae96de6fc159?hl=en
#Astronomy #Microlensing
@hydezero-message.bsky.socialHow does astrometry constrain lens mass? Read the OGLE/MOA and Keck analysis of four candidates. OB150211 remains a weak black-hole candidate; reference frames, parallax, blending and priors shape the inference.
https://note.com/hydezero/n/n8999a3b8fadc?hl=en
#Astrometry #Microlensing
@hydezero-message.bsky.socialCan tiny shifts in starlight reveal dark objects? Huston et al. combine brightness and position for four microlensing candidates: three are not black holes; one remains uncertain. A long event can also mean slow motion.
https://note.com/hydezero/n/n95386d5f8314?hl=en
#Astronomy #Microlensing
