A search for extragalactic pulsars in the local group galaxies IC 10 and Barnard's galaxy

Frontiers in Theoretical and Applied Physics/UAE 2017

Al Noori, H.^1 ; Roberts, M.S.E.^1,2 ; Champion, D.^3 ; McLaughlin, M.^4 ; Ransom, Scott^5 ; Ray, P.S.^6

New York University Abu Dhabi, Abu Dhabi, United Arab Emirates^1

Eureka Scientific, Oakland

CA, United States^2

Max-Plank-Institut Fr Radioastronomie, Bonn, Germany^3

West Virginia University, Morgantown

WV, United States^4

National Radio Astronomy Observatory, Charlottesville

VA, United States^5

Naval Research Laboratory, Washington

DC, United States^6

关键词: Green Bank Telescope;    Large magellanic clouds;    Local group;    galaxy;    Neutron stars;    Star formation rates;    Starburst galaxies;    Upper limits;    Wolf-Rayet stars;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/869/1/012071/pdf
DOI  :  10.1088/1742-6596/869/1/012071

来源: IOP

【 摘 要 】

As of today, more than 2500 pulsars have been found, nearly all in the Milky Way, with the exception of ∼28 pulsars in the Small and Large Magellanic Clouds. However, there have been few published attempts to search for pulsars deeper in our Galactic neighborhood. Two of the more promising Local Group galaxies are IC 10 and NGC 6822 (also known as Barnard's Galaxy) due to their relatively high star formation rate and their proximity to our galaxy. IC 10 in particular, holds promise as it is the closest starburst galaxy to us and harbors an unusually high number of Wolf-Rayet stars, implying the presence of many neutron stars. We observed IC 10 and NGC 6822 at 820 MHz with the Green Bank Telescope for ∼15 and 5 hours respectively, and put a strong upper limit of 0.1 mJy on pulsars in either of the two galaxies. We also performed single pulse searches of both galaxies with no firm detections.