Photometric Distances Near and Far in the Age of Gaia

Add to your list(s) Download to your calendar using vCal

• Josh Speagle (Harvard)
• Wednesday 03 April 2019, 13:15-13:45
• Large Martin Ryle Seminar Room, KICC.

If you have a question about this talk, please contact Catrina Diener.

I will discuss some recent work combining Gaia parallax measurements with broadband SED modelling to derive stellar properties (distances, reddenings, etc.). In the first part of the seminar, I will present results from recent work where we were able to use this approach to derive probabilistic distance and reddening estimates to tens of thousands of stars in order to estimate robust distances to local molecular clouds. Our results appear to reveal a ~1.5kpc-long structure off of the local arm and the plane that connects several well-known star-forming regions. In the second part of the seminar, I will discuss recent work trying to extend this approach to more complex stellar models in order to try and photometrically identify and characterize giants in the halo. Preliminary comparisons with new spectral data from he H3 Survey suggest it is possible to recover reasonable log(g) estimates from photometry with low-SNR Gaia parallax measurements.

This talk is part of the Institute of Astronomy Seminars series.

This talk is included in these lists:

• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
• Cosmology lists
• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Seminars
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Large Martin Ryle Seminar Room, KICC
• Priscilla

Note that ex-directory lists are not shown.