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On Nulling, Drifting, and Their Interactions in PSRs J1741-0840 and J1840-0840
Gajjar, V.1,2,3; Yuan, J. P.1,2; Yuen, R.1,2; Wen, Z. G.1,2; Liu, Z. Y.1,2; Wang, N.1,2
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We report detailed investigation of nulling and drifting behavior of two pulsars PSRs J1741-0840 and J1840-0840 observed from the Giant Meterwave Radio Telescope at 625 MHz. PSR J1741-0840 was found to show a nulling fraction (NF) of around 30% +/- 5% while PSR J1840-0840 was shown to have an NF of around 50% +/- 6%. We measured drifting behavior from different profile components in PSR J1840-0840 for the first time with the leading component showing drifting with 13.5 +/- 0.7 periods while the weak trailing component showed drifting of around 18 +/- 1 periods. Large nulling hampers accuracy of these quantities derived using standard Fourier techniques. A more accurate comparison was drawn from driftband slopes, measured after sub-pulse modeling. These measurements revealed interesting sporadic and irregular drifting behavior in both pulsars. We conclude that the previously reported different drifting periodicities in the trailing component of PSR J1741-0840 is likely due to the spread in these driftband slopes. We also find that both components of PSR J1840-0840 show similar driftband slopes within the uncertainties. Unique nulling-drifting interaction is identified in PSR J1840-0840 where, on most occasions, the pulsar tends to start nulling after what appears to be the end of a driftband. Similarly, when the pulsar switches back to an emission phase, on most occasions it starts at the beginning of a new driftband in both components. Such behaviors have not been detected in any other pulsars to our knowledge. We also found that PSR J1741-0840 seems to have no memory of its previous burst phase while PSR J1840-0840 clearly exhibits memory of its previous state even after longer nulls for both components. We discuss possible explanations for these intriguing nulling-drifting interactions seen in both pulsars based on various pulsar nulling models.

KeywordPulsars: General Pulsars: Individual (J1741-0840 J1840-0849)
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordPulsar Radio-emission ; Subpulse-drift ; Intensity Measurements ; Modulation Properties ; Compton-scattering ; Empirical-theory ; Periodic Nulls ; Mode ; Telescope ; Discovery
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000425487400002
Funding OrganizationWest Light Foundation of the Chinese Academy of Sciences project(XBBS-201421) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XD23010200) ; NSFC(11573059, U1531137) ; Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Personnel of China ; West Light Foundation of Chinese Academy of Sciences (WLFC)(2016-QNXZ-B-24)
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGajjar, V.
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Calif Berkeley, Space Sci Lab, 7 Gauss Way, Berkeley, CA 94710 USA
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Gajjar, V.,Yuan, J. P.,Yuen, R.,et al. On Nulling, Drifting, and Their Interactions in PSRs J1741-0840 and J1840-0840[J]. ASTROPHYSICAL JOURNAL,2017,850(2):173.
APA Gajjar, V.,Yuan, J. P.,Yuen, R.,Wen, Z. G.,Liu, Z. Y.,&Wang, N..(2017).On Nulling, Drifting, and Their Interactions in PSRs J1741-0840 and J1840-0840.ASTROPHYSICAL JOURNAL,850(2),173.
MLA Gajjar, V.,et al."On Nulling, Drifting, and Their Interactions in PSRs J1741-0840 and J1840-0840".ASTROPHYSICAL JOURNAL 850.2(2017):173.
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