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Proposal Identification No.:

A2753

Date Received:

2012-Sep-03 16:18:46

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Galactic 261.5 Hours 2.5 hr

HOW DOES FLUX FREEZING WORK IN THE MULTIPHASE ISM?

In the diffuse interstellar medium, magnetic flux-freezing rules. The diffuse gas is widely considered to have four classical phases--the Cold and Warm Neutral Media (CNM and WNM), and the Warm and Hot Ionized Media (WIM and HIM). In addition, there is a less well-recognized phase, the Warm Partially Ionized Medium (WPIM). These phases have very rough thermal pressure equality, which means that their volume densities cover a wide range, a factor of 100 at least. How does flux freezing work in the multiphase ISM?How do the field strengths and directions compare among the phases?This proposal begins an exploration of the relationship between the interstellar magnetic field in ionized media (from the Faraday rotation measure RM), in the neutral atomic medium (from Zeeman splitting of HI), and in dense molecular regions (from Zeeman splitting of OH masers).

Name Carl Heiles

Institution Astronomy Department, University of California, Berkeley, CA

E-mail heiles@astro.berkeley.edu

Phone 510 280 8099

Student no

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Instrument Setup
L-wide Atmospheric Observation Instruments:

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Sp ecial Equipment or setup: interim correlator

RFI Considerations Frequency Ranges Planned
1410-1425 1660-1673 1608-1616 1716-1724

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