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Article: Discovery and Timing of Three Millisecond Pulsars in Radio and Gamma-Rays with the Giant Metrewave Radio Telescope and Fermi Large Area Telescope

TitleDiscovery and Timing of Three Millisecond Pulsars in Radio and Gamma-Rays with the Giant Metrewave Radio Telescope and Fermi Large Area Telescope
Authors
Issue Date2021
PublisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2021, v. 910 n. 2, p. article no. 160 How to Cite?
AbstractWe performed deep observations to search for radio pulsations in the directions of 375 unassociated Fermi Large Area Telescope γ-ray sources using the Giant Metrewave Radio Telescope (GMRT) at 322 and 607 MHz. In this paper we report the discovery of three millisecond pulsars (MSPs), PSR J0248+4230, PSR J1207–5050, and PSR J1536–4948. We conducted follow-up timing observations for ~5 yr with the GMRT and derived phase-coherent timing models for these MSPs. PSR J0248+4230 and J1207–5050 are isolated MSPs having periodicities of 2.60 ms and 4.84 ms. PSR J1536–4948 is a 3.07 ms pulsar in a binary system with an orbital period of ~62 days about a companion of a minimum mass of 0.32 M⊙. We also present multifrequency pulse profiles of these MSPs from the GMRT observations. PSR J1536–4948 is an MSP with an extremely wide pulse profile having multiple components. Using the radio timing ephemeris we subsequently detected γ-ray pulsations from these three MSPs, confirming them as the sources powering the γ-ray emission. For PSR J1536–4948 we performed combined radio–γ-ray timing using ~11.6 yr of γ-ray pulse times of arrival (TOAs) along with the radio TOAs. PSR J1536–4948 also shows evidence for pulsed γ-ray emission out to above 25 GeV, confirming earlier associations of this MSP with a ≥10 GeV point source. The multiwavelength pulse profiles of all three MSPs offer challenges to models of radio and γ-ray emission in pulsar magnetospheres.
Persistent Identifierhttp://hdl.handle.net/10722/299159
ISSN
2019 Impact Factor: 5.745
2015 SCImago Journal Rankings: 3.266

 

DC FieldValueLanguage
dc.contributor.authorBhattacharyya, B-
dc.contributor.authorRoy, J-
dc.contributor.authorJohnson, TJ-
dc.contributor.authorRay, PS-
dc.contributor.authorFreire, PCC-
dc.contributor.authorGupta, Y-
dc.contributor.authorBhattacharya, D-
dc.contributor.authorKaninghat, A-
dc.contributor.authorStappers, BW-
dc.contributor.authorFerrara, EC-
dc.contributor.authorSengupta, S-
dc.contributor.authorRathour, RS-
dc.contributor.authorKerr, M-
dc.contributor.authorSmith, DA-
dc.contributor.authorSaz Parkinson, PM-
dc.contributor.authorRansom, SM-
dc.contributor.authorMichelson, PF-
dc.date.accessioned2021-04-28T02:26:58Z-
dc.date.available2021-04-28T02:26:58Z-
dc.date.issued2021-
dc.identifier.citationThe Astrophysical Journal, 2021, v. 910 n. 2, p. article no. 160-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/10722/299159-
dc.description.abstractWe performed deep observations to search for radio pulsations in the directions of 375 unassociated Fermi Large Area Telescope γ-ray sources using the Giant Metrewave Radio Telescope (GMRT) at 322 and 607 MHz. In this paper we report the discovery of three millisecond pulsars (MSPs), PSR J0248+4230, PSR J1207–5050, and PSR J1536–4948. We conducted follow-up timing observations for ~5 yr with the GMRT and derived phase-coherent timing models for these MSPs. PSR J0248+4230 and J1207–5050 are isolated MSPs having periodicities of 2.60 ms and 4.84 ms. PSR J1536–4948 is a 3.07 ms pulsar in a binary system with an orbital period of ~62 days about a companion of a minimum mass of 0.32 M⊙. We also present multifrequency pulse profiles of these MSPs from the GMRT observations. PSR J1536–4948 is an MSP with an extremely wide pulse profile having multiple components. Using the radio timing ephemeris we subsequently detected γ-ray pulsations from these three MSPs, confirming them as the sources powering the γ-ray emission. For PSR J1536–4948 we performed combined radio–γ-ray timing using ~11.6 yr of γ-ray pulse times of arrival (TOAs) along with the radio TOAs. PSR J1536–4948 also shows evidence for pulsed γ-ray emission out to above 25 GeV, confirming earlier associations of this MSP with a ≥10 GeV point source. The multiwavelength pulse profiles of all three MSPs offer challenges to models of radio and γ-ray emission in pulsar magnetospheres.-
dc.languageeng-
dc.publisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/-
dc.relation.ispartofThe Astrophysical Journal-
dc.rightsThe Astrophysical Journal. Copyright © IOP Publishing.-
dc.titleDiscovery and Timing of Three Millisecond Pulsars in Radio and Gamma-Rays with the Giant Metrewave Radio Telescope and Fermi Large Area Telescope-
dc.typeArticle-
dc.identifier.emailSaz Parkinson, PM: pablosp@hku.hk-
dc.identifier.authoritySaz Parkinson, PM=rp01803-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3847/1538-4357/abe4d5-
dc.identifier.scopuseid_2-s2.0-85104576247-
dc.identifier.hkuros322235-
dc.identifier.volume910-
dc.identifier.issue2-
dc.identifier.spagearticle no. 160-
dc.identifier.epagearticle no. 160-
dc.publisher.placeUnited States-

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