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Proposal Identification No.:

P2952 Arecibo Observatory

Date Received: 2014-Sep-02 16:21:21 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. This proposal has not been submitted before. 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 70 0 1 hour less than 100 GB

Exploring the Ionized ISM by observing two bright nearby pulsars: B0950+08

and B1133+16
ABSTRACT: Pulsar scintillation observations are a powerful probe of the ionized interstellar medium. Arecibo observations are state-of-the-art because several key observations are sensitivity-limited. Scintillation arcs, discovered at Arecibo immediately following the upgrade (Stinebring et al. 2001) yield great detail about the intervening scattering medium, but they require excellent S/N to be observable in detail. Building on previous published observations we request 20-epoch, weekly observations of two nearby and extremely bright pulsars in a not-heavily-subscribed part of the sky: B0950+08 and B1133+16. We propose to make 45-min observations of each pulsar at both 327-MHz and 430-MHz to study the scintillation arc development with frequency. When possible, we will make LOFAR single-station observations (frequency 110-190 MHz) simultaneous with the Arecibo observations. Outreach Abstract: Interstellar space is not empty. Instead, there is about one Hydrogen atom in a sugar-cubed volume of space in the vicinity of the Sun (and in other star-forming parts of our Milky Way galaxy). By studying very compact stars (pulsars) with the Arecibo telescope we can see how the interstellar gas is clumped. Does it clump randomly or are there sheets of material or long, stringy filaments of gas?With these observations of two nearby pulsars we will gain new knowledge about the distribution of that gas. In turn, this helps us to understand the life cycle of the Milky Way.

Name Daniel R Stinebring James M Cordes

Institution Oberlin College Cornell University

E-mail dan.stinebring@oberlin.edu cordes@astro.cornell.edu

Phone 440-775-8331 (607) 255-0608

Student no no

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Additional Authors
Jason Rosenblum (Oberlin undergrad): jason.rosenblum@oberlin.edu joris.verbiest@gmail.com Joris Verbiest (asst. professor, Univ. of Bielefeld, Germany):

This work is not part of a thesis.

Remote Observing Request

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

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

Begin ­ End Interval­Interval 08:50 ­ 10:35 10:35 ­ 12:20 ­ ­

Days Needed at This Interval 20 20

Time Constraints (Must Be Justified in the Prop osal Text) It would be best to make most of these observations during weekend and/or night-time hours.

Section I I I - Instruments Needed
430 G 327

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations
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Frequency Ranges Planned

Section V - Observing List Target List
B0950+08 pulsar B1133+16 pulsar

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