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Proposal Identification No.:

A2757 Arecibo Observatory

Date Received: 2013-Sep-03 16:04:22 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2013. This proposal has been submitted before. The previous proposal number is A2757. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Commensal Astronomy Spectroscopy Galactic 0 (commensal observing only) 0 (commensal observing only) 1030 650 1h less than 100 GB

SIGGMA: Survey of Ionized Gas in the Galaxy, Made with Arecibo

A key aim of the GALFA consortium is to provide legacy data sets that are more extensive than those achievable by a small group of investigators, and that are rich enough to provide a wide range of science well beyond that envisioned by the proposers. We propose to create the most extensive radio recombination line (RRL) survey ever made. Our Survey of Ionized Gas in the Galaxy, Made with Arecibo (SIGGMA) will fully sample the entire Galactic plane observable from Arecibo Observatory in the set of RRLs that fall in the bandpass of the ALFA receiver. RRLS provide a wide range of critical information on the physical state of ionized interstellar gas that is generally not obtainable through other observational means. We will use these data to identify new HII regions, compute HII region electron temperatures, investigate photodissociation region physics with carbon RRLs, and investigate the origin of the warm ionized medium. Outreach Abstract: When gases get really hot they can turn into a plasma, which has different properties from normal gases. Our survey with the Arecibo telescope will directly trace this plasma in the Milky Way, providing insight into the origins and the physics of this state of matter in our Galaxy. More detailed information is available on the SIGGMA website, at http://www.naic.edu/siggma.

Name Loren D Anderson Robert F Minchin

Institution West Virginia University Arecibo Observatory

E-mail loren.anderson@mail.wvu.edu rminchin@naic.edu

Phone 304-293-4884 787-878-2612 x283

Student no no

1

Additional Authors
Yervant Terzian: terzian@astro.cornell.edu Edward Churchwell: churchwell@astro.wisc.edu Bin Liu (graduate student): bliu@nao.cas.cn Anish Roshi: anish.roshi@gmail.com Travis McIntyre (graduate student): tpm@unm.edu

This work is part of a PhD thesis.

Remote Observing Request

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

Section I I - Time Request
The following times are in LST. For these observations night-time is required.

Begin End IntervalInterval

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) Observation in the inner Galaxy are commensal with PALFA and are detailed in their request; we note that SIGGMA can only use night time observations. Observation in the outer Galaxy are commensal with ALFAZOA and are detailed in their request.

Next Semester Time Request

2

Begin End IntervalInterval

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) Observation in the inner Galaxy are commensal with PALFA and are detailed in their request; we note that SIGGMA can only use night time observations. Observation in the outer Galaxy are commensal with ALFAZOA and are detailed in their request.

Section I I I - Instruments Needed
ALFA Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1225 - 1525 This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

Section V - Observing List Target List
Outer Galaxy: 175
3