2017 Pasadena Astronomy Postdoc Mixer

10-minute talk with lots of pretty pictures to stimulate conversations and discussions for the Pasadena Astronomy Postdoc Mixer

Transcript

1. Daniel Lenz, Pasadena Postdoc mixer, May 25 Dust and gas in the Milky Way Implications for cosmological foregrounds
2. Disclaimer
3. Disclaimer ❖ Just slightly scientific
4. Disclaimer ❖ Just slightly scientific ❖ Pretty pictures are key!
5. Disclaimer ❖ Just slightly scientific ❖ Pretty pictures are key! ❖ Talk to me about: ❖ HI ❖ Observational multiphase ISM ❖ CIB/CMB component separation ❖ Dust/Reddening ❖ Machine learning, Bayesian models, python, Mac OS
6. On Galactic HI ❖ Very abundant, easy to detect ❖ Key to understanding galaxy evolution ❖ How do galaxies replenish their star-formation fuel? ❖ Important for foreground modeling of cosmological signals
7. On Galactic HI 4 Credit: S. Janowiecki Southern hemisphere: Galactic All-Sky Survey (GASS) McClure-Griffiths+ (2009) Kalberla+ (2010, 2015) D. McClenaghan
8. On Galactic HI 4 B. Winkel Northern hemisphere: Effelsberg-Bonn HI Survey (EBHIS) Kerp+ (2011) Winkel+ (2010, 2016)
11. Multiphase ISM HI Dust
12. Multiphase ISM -15.9797 184.878 K km s 1 -1 3.8 log10 (Rayleighs) -1.00791 1.24339 log10 (Counts) ❖ There is so much more! ❖ No need for more data, just need to be smarter H⍺ -rays CII
13. WISE Lang (2014), Meisner+ (2016)
14. WISE Lang (2014), Meisner+ (2016)
15. The Cosmic Infrared Background
16. The Cosmic Infrared Background
17. The Cosmic Infrared Background ❖ Made up from dust in star- forming galaxies at z = 1..2 ❖ Used for ❖ cosmic evolution of the star formation rate ❖ tracer of the density field Lagache+ (2005)
18. CIB: Galactic poles 12 Total FIR intensity
19. CIB: Galactic poles 12 CIB
20. Reddening
21. Reddening ❖ E(B-V) = Extinction in B band - Extinction in V band ❖ More dust => larger E(B-V) ❖ E(B-V) maps essential for correcting observations for Galactic reddening ❖ Schlegel, Finkbeiner, Davis (1998) still state-of-the-art
22. Reddening ❖ E(B-V) = Extinction in B band - Extinction in V band ❖ More dust => larger E(B-V) ❖ E(B-V) maps essential for correcting observations for Galactic reddening ❖ Schlegel, Finkbeiner, Davis (1998) still state-of-the-art
23. Independent SFD corrections -0.01 0.01 SFD - PG10 [mag] -0.01 0.01 SFD - Model [mag] ❖ Peek & Graves (2010) ❖ Based on elliptical galaxies ❖ Lenz & Hensley (2017, WSNW) ❖ Based on Galactic HI
24. Thanks! ❖ Talk to me about: ❖ HI ❖ Observational multiphase ISM ❖ CIB/CMB component separation ❖ Dust/Reddening ❖ Machine learning, Bayesian models, python, Mac OS