Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2015Spring/FreiretagP2817.pdf Дата изменения: Tue Sep 9 17:24:52 2014 Дата индексирования: Mon Apr 11 16:43:38 2016 Кодировка: Поисковые слова: туманность андромеды

Proposal Identification No.:

P2817 Arecibo Observatory

Date Received: 2014-Sep-01 08:18:26 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. This proposal has been submitted before. The previous proposal number is P2817. Proposal Type: General 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: Regular Pulsars Galactic 13 2 18 1 less than 100 GB

PSR J1946+3417: the most massive pulsar ever?

We propose to continue pro ject P2817 that is targeting a new millisecond binary pulsar with an unusual eccentric orbit, PSR J1946+3417. The results of previous timing are spectacular: the timing precision, 220 ns every 10 minutes, makes it suitable for inclusion in PTAs. The precise timing allowed a precise measurement of the companion (0.2740 +/- 0.0055 solar masses) and pulsar mass (1.93 +/- 0.07 solar masses), making this the third neutron star with a mass consistent with 2 solar masses. We propose to observe the pulsar for another 12 hours, this should allow a 4-fold improvement of the precision of its mass measurement, making it by far the most precise mass measurement for any NS with such a high mass. This will allow us to determine whether this is the most massive NS known, and possibly further constrain the equation of state for dense nuclear matter. Outreach Abstract: Observaciones recientes con el telescopio de Arecibo han medido la masa del pulsar J1946+3417: 1.93 +/- 0.07 veces la masa del Sol. E'sta es la tercera estrella de neutrones masiva que se conoce. Con algunas horas extras de observacio'n con Arecibo podemos mejorar la precisio'n de la medicio'n 4 veces, y saber si e'sta es o no la estrella de neutrones ma's masiva conocida. Esto es importante para comprender el interior de las estrellas de neutrones, lo que es todavi'a un misterio.

Name Paulo C Freire Ewan D Barr

Institution Max Planck Institute for RadiAstronomy Swinburn University of Technology

E-mail pfreire@mpifr-bonn.mpg.de ebarr@swin.edu.au

Phone +49 228525496 +61 392144306

Student no no

1


Additional Authors
Michael Kramer (mkramer@mpifr-bonn.mpg.de) David Champion (champion@mpifr-bonn.mpg.de)

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 not needed.

Begin ­ End Interval­Interval 19:30 ­ 20:30 ­ ­ ­

Days Needed at This Interval 10

Time Constraints (Must Be Justified in the Prop osal Text) Nine observations should be scheduled within a single orbital period of 27 days, as uniformly as possible. Another observation should be scheduled on the same semester, three months before or after the orbital campaign.

Next Semester Time Request

2


Begin ­ End Interval­Interval 19:30 ­ 20:30 ­ ­ ­

Days Needed at This Interval 2

Time Constraints (Must Be Justified in the Prop osal Text) These two observations should happen 3 and 6 months after last observations from previous semester.

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

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1130-1730 This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST. 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
PSR J1946+3417

3