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2017 Pasadena Astronomy Postdoc Mixer

Daniel
May 25, 2017

2017 Pasadena Astronomy Postdoc Mixer

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

Daniel

May 25, 2017
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  1. Daniel Lenz,
    Pasadena Postdoc mixer, May 25
    Dust and gas in the
    Milky Way
    Implications for cosmological
    foregrounds

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  2. Disclaimer

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  3. Disclaimer
    ❖ Just slightly scientific

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  4. Disclaimer
    ❖ Just slightly scientific
    ❖ Pretty pictures are key!

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  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

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  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

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  7. On Galactic HI
    4
    Credit: S. Janowiecki
    Southern hemisphere:
    Galactic All-Sky
    Survey (GASS)
    McClure-Griffiths+
    (2009)

    Kalberla+ (2010, 2015)
    D. McClenaghan

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  8. On Galactic HI
    4
    B. Winkel
    Northern hemisphere:
    Effelsberg-Bonn HI
    Survey (EBHIS)
    Kerp+ (2011)

    Winkel+ (2010, 2016)

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  11. Multiphase ISM
    HI Dust

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  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

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  13. WISE
    Lang (2014), Meisner+ (2016)

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  14. WISE
    Lang (2014), Meisner+ (2016)

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  15. The Cosmic Infrared Background

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  16. The Cosmic Infrared Background

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  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)

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  18. CIB: Galactic poles
    12
    Total FIR intensity

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  19. CIB: Galactic poles
    12
    CIB

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  20. Reddening

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  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

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  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

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  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

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  24. Thanks!
    ❖ Talk to me about:
    ❖ HI
    ❖ Observational multiphase ISM
    ❖ CIB/CMB component separation
    ❖ Dust/Reddening
    ❖ Machine learning, Bayesian models, python, Mac
    OS

    View Slide