| Name: | JYOTIRMOY DAS |
| Affiliation: | National Centre for Radio Astrophysics(NCRA, TIFR) |
| Conference ID : | ASI2024_322 |
| Title : | Search for pulsars in globular clusters with the GMRT: discoveries and timings |
| Authors : | Jyotirmoy Das1, Jayanta Roy1, Scott Ransom2, Bhaswati Bhattacharyya1, Sanjay Kudale1,3, Karel Adamek4, Wes Armour4 and Mekhala Muley3 |
| Authors Affiliation: | 1. National Centre for Radio Astrophysics (NCRA), Pune-411007, India.
2. National Radio Astronomy Observatory (NRAO), Arbovale, West Virginia-24915, United States.
3. Giant Metrewave Radio Telescope (GMRT), Khodad, Pune-410504, India.
4. Oxford e-Research Centre (OeRC), Oxford-OX1 3PJ, United Kingdom. |
| Mode of Presentation: | Oral |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | Globular Clusters (GCs) are the gravitationally bound star clusters in the galaxy. Due to their compactness and high collision rate, the clusters become the formation hub of millisecond pulsars (MSPs). The pulsars' properties in the globular clusters are quite different from the other Galactic pulsars due to the different evolutionary paths which makes them most interesting to study the underlying population. Benefitted from the sensitivity enhancement with the upgraded GMRT (uGMRT) and steep spectral nature of the pulsars, we designed a pilot survey to search for MSPs in the GCs in the low-frequency range (300-750 MHz using Band-4 and Band-3 of the GMRT). From the ongoing observations, we have already discovered a 4.32 ms pulsar in NGC6093 (M80). It is a binary MSP in a compact orbit (orbital period ~ 16 hours) with a companion, having a mass of ~ 0.035 solar mass. The orbital period and the probable companion mass indicate towards an MSP in a unique evolutionary phase, called the black widow spider system. This is the first pulsar to be discovered in NGC6093, making the dispersion measure known accurately to perform a deep search for any other pulsars within this GC.
We aim to describe the GMRT survey for pulsars in GCs while presenting the discovery and results from timing studies of the new MSP.
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