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Proposal Identification No.:

A3023 Arecibo Observatory

Date Received: 2015-Sep-01 14:46:58 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2015. This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this 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: Regular Astronomy Spectroscopy Galactic 10 0 1.25 hr over 500 GB

Astrophysical masers: coherent, or simply noise?

The statistics of radiation from astrophysical masers has long been thought to be consistent with Gaussian noise. This is despite the clearly coherent nature of the emission mechanism. Recent theoretical advances, however, have reached the consensus that experiments with sufficient spectral resolution (<0.1 Hz) should detect evidence of non-Gaussianity in the radiation statistics. Previous non-detections have averaged over bandwidths of approx. kHz. Using baseband recording, I propose to conduct a search for non-Gaussianity, and hence conclusive evidence of coherence, in three Galactic OH masers with the mind-blowing spectral resolution of approx. 0.01 Hz. If, as some models suggest, maser radiation is also phase-stable, these observations will have important implications for gravitational-wave detection. Outreach Abstract: We are all familiar with lasers, from pointers to dance clubs to CD players. Amazingly, lasers exist in space too, except that they emit radio waves and not light that we can see. But how do they work?Using the awesomely large Arecibo 305-m telescope, I will answer basic questions about how the space lasers emit such bright radiation.

Name Vikram Ravi

Institution Californa Institute of Technology

E-mail vikram@caltech.edu

Phone +16263954015

Student no

This work is not part of a thesis.

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Remote Observing Request

X

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

Section I I - Time Request
The following times are in LST. For these observations night-time is not needed.

Begin ­ End Interval­Interval 18:14 ­ 19:35 18:22 ­ 19:43 17:58 ­ 20:31 ­

Days Needed at This Interval 2 2 2

Time Constraints (Must Be Justified in the Prop osal Text) There are no constraints on the days requested. Although, as I plan to travel to Arecibo to conduct these observations, it would be good if they could occur in a contiguous block.

Section I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1617 - 1717

Section V - Observing List
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Target List
Ob ject RA (J2000) DEC (J2000) LST-rise LST-set G34.26+0.15 18:53:18.5 +01:14:58 18:14:11 19:34:03 G35.20-1.73 19:01:44.9 +01:13:37 18:22:46 19:42:21 G45.47+0.13 19:14:07.4 +11:12:20 17:58:50 20:30:55

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