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First pulsar detected in globular cluster GLIMPSE-C01

January 1, 2024
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First pulsar detected in globular cluster GLIMPSE-C01
VLITE 340 MHz picture of GLIMPSE-C01 from February 27, 2021. Credit score: McCarver et al., 2023.

Utilizing the Karl G. Jansky Very Giant Array (VLA), astronomers have found a millisecond pulsar within the globular cluster GLIMPSE-C01 as a part of the VLA Low-band Ionosphere and Transient Experiment (VLITE). That is the primary pulsar ever detected on this cluster. The discovering was reported in a paper revealed December 18 on the pre-print server arXiv.

Pulsars are extremely magnetized, rotating neutron stars emitting a beam of electromagnetic radiation from their poles, mostly within the type of radio waves. Essentially the most quickly rotating pulsars, with rotation durations beneath 30 milliseconds, are often known as millisecond pulsars (MSPs). Astronomers assume that they’re shaped in binary programs when the initially extra large element turns right into a neutron star that’s then spun up resulting from accretion of matter from the secondary star.

Attributable to their giant stellar densities, globular clusters (GCs) are perceived as glorious locations for the formation of MSPs. Their stellar densities are so giant that many neutron stars can purchase a companion by way of binary trade encounters.

That’s the reason a crew of astronomers led by Amaris V. McCarver of the Texas Tech College in Lubbock, Texas, determined to conduct a radio imaging seek for pulsars in almost 100 GCs. For this objective, they analyzed photos from VLITE and from the VLITE Commensal Sky Survey (VCSS).

“On this paper we current a big seek for pulsar candidates in globular clusters utilizing low frequency radio continuum photos,” the researchers wrote.

In whole, the crew recognized 10 sources for the pattern of 97 globular clusters. Afterward, they carried out a weighted match utilizing archival and new flux density measurements to find out the spectral index for every supply.

The strongest pulsar candidate turned out to be the supply in GLIMPSE-C01—a dense and big intermediate-age GC positioned about 10,760 mild years away from the Earth. The supply has an especially steep spectrum and the evaluation of extra radio, X-ray and infrared information confirmed its pulsar nature.

The newfound pulsar, designated GLIMPSE-C01A, has a spin interval of 19.78 milliseconds and a dispersion measure of 491.1 computer/cm3. It seems that this pulsar has a better exhausting X-ray (2–10 keV) luminosity than most MSPs in globular clusters, whereas additionally having a slower spin interval. This implies a excessive magnetic area—at a stage of 1 billion Gauss. The attribute age of this pulsar is estimated to be 100 million years.

Summing up the outcomes, the researchers observe that performing common timing and establishing an orbital and timing answer for GLIMPSE-C01A is important with a purpose to receive extra properties of this pulsar. They added that their discovery underlines the effectiveness of spectral index searches for pulsars.

Extra data:
Amaris V. McCarver et al, A VLITE Seek for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01, arXiv (2023). DOI: 10.48550/arxiv.2312.11694

Journal data:
arXiv


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