The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars
The timing follow-up of newly discovered millisecond pulsars (MSPs) is hindered by the larger positional uncertainty (a few tens of arcminutes) associated with the discovery. In this paper, we present the localization of two MSPs, discovered by the GMRT High Resolution Southern Sky survey, up to arc...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acc10f |
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| author | Shyam S. Sharma Jayanta Roy Sanjay Kudale Bhaswati Bhattacharyya Arpit K. Behera Shubham Singh |
| author_facet | Shyam S. Sharma Jayanta Roy Sanjay Kudale Bhaswati Bhattacharyya Arpit K. Behera Shubham Singh |
| author_sort | Shyam S. Sharma |
| collection | DOAJ |
| description | The timing follow-up of newly discovered millisecond pulsars (MSPs) is hindered by the larger positional uncertainty (a few tens of arcminutes) associated with the discovery. In this paper, we present the localization of two MSPs, discovered by the GMRT High Resolution Southern Sky survey, up to arcsecond accuracy using a 33 MHz offline coherently dedispersed gated correlator. This gated correlator is an upgraded version of the earlier 16 MHz design. This new development with a factor of 2 enhancement in the observing bandwidth offers better sensitivity in the image domain, leading to more precise localization. Aided by the precise position, we followed up these two MSPs with sensitive phased-array (PA) beams of upgraded GMRT from 300 to 1460 MHz. More sensitive observations in the PA mode for these two MSPs yield precise (∼sub- μ s) time-of-arrivals, with dispersion measure uncertainties in the range of 10 ^−4 –10 ^−5 pc cm ^−3 . We also report the profile evolution of the two MSPs over 300–1460 MHz. Finally, we discuss the suitability of these MSPs for the pulsar timing array experiments aimed to detect low-frequency gravitational waves. |
| first_indexed | 2024-03-12T04:49:45Z |
| format | Article |
| id | doaj.art-36b20fcb1e994c3889c1f1579a72ffd2 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:49:45Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-36b20fcb1e994c3889c1f1579a72ffd22023-09-03T09:25:24ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194728810.3847/1538-4357/acc10fThe GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond PulsarsShyam S. Sharma0Jayanta Roy1https://orcid.org/0000-0002-2892-8025Sanjay Kudale2Bhaswati Bhattacharyya3https://orcid.org/0000-0002-6287-6900Arpit K. Behera4Shubham Singh5National Centre for Radio Astrophysics, Tata Institute of Fundamental Research , Pune 411007, India ; ssunder@ncra.tifr.res.inNational Centre for Radio Astrophysics, Tata Institute of Fundamental Research , Pune 411007, India ; ssunder@ncra.tifr.res.inNational Centre for Radio Astrophysics, Tata Institute of Fundamental Research , Pune 411007, India ; ssunder@ncra.tifr.res.inNational Centre for Radio Astrophysics, Tata Institute of Fundamental Research , Pune 411007, India ; ssunder@ncra.tifr.res.inNational Centre for Radio Astrophysics, Tata Institute of Fundamental Research , Pune 411007, India ; ssunder@ncra.tifr.res.inNational Centre for Radio Astrophysics, Tata Institute of Fundamental Research , Pune 411007, India ; ssunder@ncra.tifr.res.inThe timing follow-up of newly discovered millisecond pulsars (MSPs) is hindered by the larger positional uncertainty (a few tens of arcminutes) associated with the discovery. In this paper, we present the localization of two MSPs, discovered by the GMRT High Resolution Southern Sky survey, up to arcsecond accuracy using a 33 MHz offline coherently dedispersed gated correlator. This gated correlator is an upgraded version of the earlier 16 MHz design. This new development with a factor of 2 enhancement in the observing bandwidth offers better sensitivity in the image domain, leading to more precise localization. Aided by the precise position, we followed up these two MSPs with sensitive phased-array (PA) beams of upgraded GMRT from 300 to 1460 MHz. More sensitive observations in the PA mode for these two MSPs yield precise (∼sub- μ s) time-of-arrivals, with dispersion measure uncertainties in the range of 10 ^−4 –10 ^−5 pc cm ^−3 . We also report the profile evolution of the two MSPs over 300–1460 MHz. Finally, we discuss the suitability of these MSPs for the pulsar timing array experiments aimed to detect low-frequency gravitational waves.https://doi.org/10.3847/1538-4357/acc10fPulsarsMillisecond pulsarsAstronomical techniques |
| spellingShingle | Shyam S. Sharma Jayanta Roy Sanjay Kudale Bhaswati Bhattacharyya Arpit K. Behera Shubham Singh The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars The Astrophysical Journal Pulsars Millisecond pulsars Astronomical techniques |
| title | The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars |
| title_full | The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars |
| title_fullStr | The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars |
| title_full_unstemmed | The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars |
| title_short | The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. V. Localization of Two Millisecond Pulsars |
| title_sort | gmrt high resolution southern sky survey for pulsars and transients v localization of two millisecond pulsars |
| topic | Pulsars Millisecond pulsars Astronomical techniques |
| url | https://doi.org/10.3847/1538-4357/acc10f |
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