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| Title: | PSR J2030+364I: Radio Discovery and Gamma-ray Study of a Middle-aged Pulsar in the Now Identified Fermi-LAT Source 1FGL J2030.0+3641 | | Online Source: | Click to View PDF File[PDF Size: 4.5 MB] | | Author: | Camilo, F.; Kerr, M.; Ray, P. S.; Ransom, S. M.; Johnston, S.; Romani, R. W.; Parent, D.; Decesar, M. E.; Harding, A. K.; Donato, D.; SazParkinson, P. M.; Ferrara, E. C.; Freire, P. C. C.; Guillemot, L; Keith, M.; Kramer, M.; Wood, K. S. | | Abstract: | In a radio search with the Green Bank Telescope of three unidentified low Galactic latitude Fermi-LAT sources, we have discovered the middle-aged pulsar J2030+3641, associated with IFGL J2030.0+3641 (2FGL J2030.0+3640). Following the detection of gamma-ray pulsations using a radio ephemeris, we have obtained a phase-coherent timing solution based on gamma-ray and radio pulse arrival times that spans the entire Fermi mission. With a rotation period of 0.28, spin-down luminosity of 3 x 10(exp 34) erg/s, and characteristic age of 0.5 Myr, PSR J2030+3641 is a middle-aged neutron star with spin parameters similar to those of the exceedingly gamma-ray-bright and radio-undetected Geminga. Its gamma-ray flux is 1 % that of Geminga, primarily because of its much larger distance, as suggested by the large integrated column density of free electrons, DM = 246 pc/cu cm. We fit the gamma-ray light curve, along with limited radio polarimetric constraints, to four geometrical models of magnetospheric emission, and while none of the fits have high significance some are encouraging and suggest that further refinements of these models may be worthwhile. We argue that not many more non-millisecond radio pulsars may be detected along the Galactic plane that are responsible for LAT sources, but that modified methods to search for gamma-ray pulsations should be productive - PSR J2030+364 I would have been found blindly in gamma rays if only > or approx. 0.8 GeV photons had been considered, owing to its relatively flat spectrum and location in a region of high soft background. | | Collection: | NASA | | NASA Center: | Goddard Space Flight Center; Marshall Space Flight Center | | Publication Date: | November 17, 2011 | | Publication Year: | 2011 | | Document ID: | 20120013877 | | Subject Category: | ASTROPHYSICS | | Report/Patent Number: | GSFC.JA.6829.2012 | | Contract/Grant/Task Number: | PF0-110073; NAS8-03060 | | Publication Information: | Number of pages = 9 | | Language: | English | | Relation Information: | Submitted for publication to The Astrophysical Journal | | Subject Terms: | EPHEMERIDES; FERMI GAMMA-RAY SPACE TELESCOPE; FREE ELECTRONS; GAMMA RAY ASTRONOMY; GAMMA RAYS; LIGHT CURVE; LUMINOSITY; NEUTRON STARS; POLARIMETRY; PULSARS; RADIO ASTRONOMY; SPACEBORNE ASTRONOMY; SWIFT OBSERVATORY; UNSTEADY FLOW | | Accessibility: | Unclassified; Publicly available; Unlimited; Copyright, Distribution as joint owner in the copyright | | Document Source: | CASI | | Updated/Added to NTRS: | Sep 25, 2012 | 
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