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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report on a systematic and sensitive search for pulsars and transientsources in the nearby spiral galaxy M33, conducted at 1.4 GHz with the Arecibotelescope's seven-beam receiver system, ALFA. Data were searched for bothperiodic and aperiodic sources, up to 1000 pc cm^{-3} in dispersion measure andon timescales from $\sim$50 \us to several seconds. The galaxy was sampled with12 ALFA pointings, or 84 pixels in total, each of which was searched for 2-3hr. We describe the observations, search methodologies and analysis strategiesapplicable to multibeam systems, and comment on the data quality and statisticsof spurious events that arise due to radio frequency interference. While thesesearches have not led to any conclusive signals of periodic or transient naturethat originate in the galaxy, they illustrate some of the underlying challengesand difficulties in such searches and the efficacy of simultaneous multiplebeams in the analysis of search output. The implied limits are $\la$5 uJy Mpc^2in luminosity (at 1400 MHz) for periodic sources in M33 with duty cycles$\la$5%. For short-duration transient signals (with pulse widths $\la$100 \us),the limiting peak flux density is 100 mJy, which would correspond to a5-$\sigma$ detection of bright giant pulses ($\sim$20 kJy) from Crab-likepulsars if located at the distance of M33. We discuss the implications of ournull results for various source populations within the galaxy and comment onthe future prospects to conduct even more sensitive searches with the upcomingnext-generation instruments including the Square Kilometer Array and itspathfinders.

An Arecibo Search for Pulsars and Transient Sources in M33