Peek Space Telescope Science Institute July 3, 2017 ISM3D+ Look up here if you get lost! Kirill Tchernyshyov Johns Hopkins Eddie Schlafly LBNL @jegpeek @jegpeek AMA GALFA-HI DR2!
W1 W1 F F N N 1000 10000 wavelength[Å] 6 5 4 2 1 0 3 A O / AV MW dust grains can mostly be parameterized by Rv Reddening is often reduced to a single parameter family, Rv
could adopt for 3d extinction mapping…” Sale 2015 “…The most obvious is to infer the extinction to stars that feature in the ‘input catalogue’. “ “One might also be interested in the estimating the extinction to some arbitrary point or points in space.” Pays the Bills …since extinction affects the light from stars distributed throughout the Galaxy it offers a direct route to studying the elusive 3d structure of the ISM. Is the Money
Log scale FIG. 8.ÈFull-sky dust map for the NGP (top) and SGP (bottom) Our best high latitude dust maps come from FIR emission Schlegel, Finkbeiner, & Davis 98 Dust 90 180 270 90 180 270 . 0 3 3 3 . 0 MJy/sr Log scale F IG. 8.ÈFull-sky dust map for the NGP ( top) and SGP ( bottom )
Cunha, and Fang 12 0.1 0.3 1 3 Faint-end slope of luminosity func, s(z) 10-2 10-1 100 101 102 103 bias / error For Peek-Graves 2010 correction to dust map ‘non-Gaussianity’ ‘dw/dt’ target precision For known errors to dust map Redshift of galaxies used for cosmology ~0 0.7 1.9 3.7
0 0 >0.015 >0.015 >0.015 <-0.015 <-0.015 <-0.015 E (B − V ) E (B − V ) E (B − V ) E (B − V ) E (B − V ) NHI cm−2 HI methods and FIR methods give ~similar precision JEGP 13 Extinction HI FIR Extinction HI FIR
2025 2030 Huge Galactic HI surveys are on the horizon Log[ # resolution elements] LAB GASS GALFA-HI EBHIS APERTIF/ASKAP SKA surveys? surpasses Planck resolution
R~23,000 ugrizy 8 x 108 stars 1.5 x 105 stars 2 x 108 stars 5 x 106 stars 140 x 108 stars ~no parallax ~no parallax precise parallax ~no parallax some parallax now now April 2018? 2020s 2020s We are in the era of amazing tomography machines 䢀Available in MAST today!
Map tested only at HMSFRs 0.1 1.0 10.0 Aquila-Ophiuchus CO + HI = NH (1021 H/cm2) 0.1 1.0 10.0 AV gas at Av=2 is not CO + HI “Dark Gas” PS1 … to be continued
of dust, crucial for cosmology R(V) is not simply a proxy for gas density; 3D structure influences R(V), for unknown reasons The Perseus arm does not seem to be a spiral shock, although we need better data… Modern tomography uses big data and new models To answer questions of formation we need to measure where gas is and how it moves: D/V diagrams
26o 28o 15h00m 14h32m 14h04m 13h36m 24o 26o 28o Right Ascension n o i t a n i l c e D 24o 26o 28o 15h00m 14h32m 14h04m 13h36m 24o 26o 28o Right Ascension n o i t a n i l c e D Clark, JEGP, Putman 14 Declination 24o 26o 28o 15h00m 14h32m 14h04m 13h36m 24o 26o 28o Right Ascension n o i t a n i l c e D
Green, Schlafly, & Finkbeiner 2015 …since extinction affects the light from stars distributed throughout the Galaxy it offers a direct route to studying the elusive 3d structure of the ISM. Sale+2015