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Zone of Avoidance (ZOA) P. Henning, UNM. Obscuration due to dust and high stellar density in our Galaxy blocks ~20% of optical extragalactic universe, less in the IR Need all-sky map of surrounding mass inhomogeneity to understand LG’s motion, dynamical evolution

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Zone of avoidance zoa p henning unm
Zone of Avoidance (ZOA)P. Henning, UNM

  • Obscuration due to dust and high stellar density in our Galaxy blocks ~20% of optical extragalactic universe, less in the IR

  • Need all-sky map of surrounding mass inhomogeneity to understand LG’s motion, dynamical evolution

  • HI surveys can map galaxies, large-scale structure in regions of bad obscuration and stellar confusion


New

New

Part of Norma

SC

PKS1343

cluster

New

Puppis

void

Puppis

Hydra wall and

Monoceros

extension



Zoa with alfa
ZOA with ALFA Pisces-Perseus SC; Local, Orion, Taurus, edge of Monoceros voids

  • Due to likely pressure on popular, low-b portions of AO sky, best bet is commensal observing

  • Option 1: GALFA

    • Single, or double-drift mapping of |b| < 5°

    • Uniform sky sensitivity

    • Nyquist sampling with double drift. Time needed is ~460 hours

  • Would look much like an E-ALFA survey, but would add much to Parkes info? Better positions, further north, but not much deeper


Zoa with alfa cont
ZOA with ALFA, cont. Pisces-Perseus SC; Local, Orion, Taurus, edge of Monoceros voids

  • Option 2: PALFA

    • Galactic plane survey, |b| < 5°, 32° < l < 80°, “possibly also anticenter”

    • Intermediate latitude survey, to 10° or beyond (tbd)

    • 300 sec beam-1 oodles of time, but point and stare mode. Total time 2000 – 3000 hours

  • Enormously deep, but observing mode introduces complications from varying feed-sky geometry

  • Really want 200 MHz backend


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