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Proposal Identification No.:

P2717 Arecibo Observatory

Date Received: 2013-Aug-28 15:29:41 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 P2717. Proposal Type: General 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: Regular Pulsars Galactic 85 46 1.25 over 500 GB

Millisecond pulsar searches in unidentified Fermi sources at high Galactic lati-

tudes
ABSTRACT: The Large Area Telescope (LAT) on the Fermi Gamma-Ray Space Telescope is revolutionizing the study of the high-energy sky and of pulsars. Fermi-LAT has identified more than 130 pulsars, including the new class of gamma-ray-emitting millisecond pulsars (MSPs). Many of these MSPs are being discovered worldwide in radio searches of unidentified LAT sources located at high Galactic latitudes. At Arecibo we propose to survey 58 well-selected high-latitude unidentified sources from the 4-year LAT source list. We will search for MSPs in these targets at a frequency of 327 MHz, observing each source four times to counter the effects of scintillation, eclipses, and orbital acceleration, which otherwise demonstrably diminish the chance to detect existing MSPs in such systems. Our survey will be the most sensitive such work done anywhere, and is a continuation of similar successful work recently started at Arecibo. Outreach Abstract: Neutron stars contain more mass than the Sun collapsed into the size of a city. Many of these neutron stars rotate rapidly and emit beams of radio waves that we can detect on Earth, in lighthouse-like fashion. While the radio pulses enable us to detect many of these pulsars, the energy they carry is puny. Some pulsars also emit gamma rays, the most energetic photons in the electromagnetic spectrum. Studying the combined gamma-ray and radio emission from a large sample of pulsars will help us to understand how these mysterious and extreme stars work. In this pro ject, we will search for radio pulsations from the locations of gamma ray sources detected with the Fermi satellite. So far the origin of these gamma rays is unknown, but there is a good chance that they arise from pulsars.

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Name Fernando Camilo Thankful Cromartie

Institution NAIC UNC Chapel-Hill

E-mail camilo@naic.edu thankful.cromartie@gmail.com

Phone 787-878-2612, ext 361 919-923-4444

Student no U

Additional Authors
Matthew Kerr matthew.kerr@gmail.com Scott Ransom sransom@nrao.edu Paul Ray Paul.Ray@nrl.navy.mil Elizabeth Ferrara elizabeth.c.ferrara@nasa.gov Julia Deneva julia.deneva@gmail.com

This work is not part of a thesis.

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 ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) We wish to observe 58 sources, 4 times each (on different days), for 15 minutes at a time. Our on-source time is therefore 58 hours. The sources are more or less evenly distributed in RA (except that we have none in the Galactic plane), and in LST. We estimate that on average we can observe some 7 sources in each of 8 session types (centered at different LSTs). We can provide precise RA and Dec of each source upon request. 2

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

Sp ecial Equipment or setup: We will be using PUPPI, and after each session will stream data off to our own external disks, which we will FedEx to the processing sites.

Section IV - RFI Considerations Frequency Ranges Planned
292-362

Section V - Observing List Target List
58 Fermi-Large Area Telescope unidentified sources obtained from 4-year photon list, spanning all LSTs (except for right on the Galactic plane; all sources have |b|>4 deg). Selection criteria given in proposal.

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