Galactic all sky survey gass
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Galactic All-Sky Survey (GASS). GASS Observations. Entire HI sky south of =0 Fully sampled Angular resolution ~15’ Sensitivity ~ 70 mK Spectral resolution ~ 1 km/s 450 km/s to 400 km/s Scanning entire sky twice ~1500 hours in 2 years. Scientific Goals. HI Shells

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Galactic All-Sky Survey (GASS)

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Galactic all sky survey gass

Galactic All-Sky Survey (GASS)


Galactic all sky survey gass

GASS Observations

  • Entire HI sky south of =0

  • Fully sampled

  • Angular resolution ~15’

  • Sensitivity ~ 70 mK

  • Spectral resolution ~ 1 km/s

  • 450 km/s to 400 km/s

  • Scanning entire sky twice

  • ~1500 hours in 2 years

Scientific Goals

  • HI Shells

  • Galactic Fountain, HVCs

  • Galactic Structure


Galactic all sky survey gass

Galactic All-Sky Survey


Gsh 242 03 37

GSH 242-03+37

McClure-Griffiths et al., in prep


Gass and gsh 242 03 37

GASS and GSH 242-03+37

  • GSH 242-03+47 was discovered by Heiles (1979)

    • No further imaging, though obvious in LDS

  • One of the largest HI shells in the Galaxy

    • Distance: 3.5 kpc

    • Radius: 500 pc

    • Expansion velocity: 20 km/s

    • Expansion energy: 1054 ergs!

    • Break-outs above and below the plane

    • Capped above the plane at ~1 kpc

    • Amazingly similar morphology to GSH 277+00+36

      • Instability modes at work?


Gsh 242 03 371

GSH 242-03+37

  • Red: ROSAT 1/4 keV

  • Blue: HI from GASS

  • The Xray emission from the shell interior indicates that there is hot (~106 K) gas in the shell interior

  • Is this hot gas venting to the halo?

    • Sensitivity of ROSAT too low to tell


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