English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report unsuccessful searches for pulsations from the neutron star RXJ1836.2+5925 identified with the EGRET source 3EG J1835+5918. A 24 hrobservation with the NRAO Green Bank Telescope at 820 MHz placed an upper limiton flux density of 17 uJy for P > 10 ms, and gradually increasing limits for 1< P < 10 ms. The equivalent luminosity is lower than that of any known pulsarwith the possible exception of the radio-quiet gamma-ray pulsar Geminga. A setof observations with the Chandra X-ray Observatory HRC totaling 118 ks revealedno pulsar with 1 ms < P < 10 s. The upper limit on its pulsed fraction is 35%assuming a sinusoidal pulse shape. The position of RX J1836.2+5925 in Chandraobservations separated by 3 years is unchanged within errors, leading to anupper limit on its proper motion of <0.14"/yr, or v < 530 km/s at d = 800 pc, amaximum distance estimated from its thermal X-ray spectrum. With these nullresults, the properties of 3EG J1835+5918 and its X-ray counterpart RXJ1836.2+5925 are consistent with a more distant or older version of Geminga, orperhaps a recycled pulsar. Having nearly exhausted the capabilities of currentinstrumentation at all wavelengths, it will likely fall to the Gamma-ray LargeArea Space Telescope to discover pulsations from 3EG J1835+5918.

The Next Geminga: Search for Radio and X-ray Pulsations from the Neutron Star Identified with 3EG J1835+5918