Zone of avoidance zoa p henning unm
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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

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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


Zone of avoidance zoa p henning unm

New

New

Part of Norma

SC

PKS1343

cluster

New

Puppis

void

Puppis

Hydra wall and

Monoceros

extension


Zone of avoidance zoa p henning unm

  • ZOA in the AO sky cuts some important (known) LSS: Pisces-Perseus SC; Local, Orion, Taurus, edge of Monoceros voids


Zoa with alfa

ZOA with ALFA

  • 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.

  • 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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