PSR J1907+0918 - a young radio pulsar near SGR 1900+14 and G42.8+0.6

Abstract

We have extensively searched for periodic signals from the soft-gamma repeater SGR 1900+14, at 430 and 1410 MHz with the Arecibo telescope. Our observations did not reveal the 5.16-s periodicity discovered at X-ray wavelengths by Hurley et al. (1998). We place pulsed flux-density upper limits of 150 and 30 uJy at 430 and 1410 MHz respectively. In the course of the 1410 MHz search we discovered a 226-ms radio pulsar, PSR J1907+0918. Its period derivative implies that the age of J1907+0918 is only 38 kyr, making it one of the youngest members of the known pulsar population. Independent lines of evidence in support of this apparent youth are the unusually high degree of circular polarization and a relatively flat radio spectrum. The close proximity of this young radio pulsar to the supernova remnant G42.8+0.6 poses a problem for the proposed association between the G42.8+0.6 and SGR 1900+14.

5 pages, 1 figure, accepted for publication in ApJ. minor mods to submitted version and also, sadly, a change of title

References in corpus (3)

• The Discovery of an Embedded Cluster of High-Mass Stars Near SGR 1900+14
• Is SGR 1900+14 a Magnetar?
• Observations of a possible new soft gamma repeater, SGR1801-23

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• Gigahertz-peaked spectra pulsars and thermal absorption model
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• Constraining Radio Emission from Magnetars
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• On Period and Burst Histories of AXPs and SGRs and the Possible Evolution of these Objects on the P-Pdot Diagram
• New upper limits on low-frequency radio emission from isolated neutron stars with LOFAR
• Unveiling the nature of the unidentified gamma-ray sources 4FGL J1908.6+0915e, HESS J1907+089/HOTS J1907+091, and 3HWC J1907+085 in the sky region of the magnetar SGR 1900+14
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