On Nulling, Drifting, and Their Interactions in PSRs J1741-0840 and J1840-0840
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017-12-01 |
| 卷号 | 850期号:2页码:15 |
| ISSN号 | 0004-637X |
| 关键词 | pulsars: general pulsars: individual (J1741-0840, J1840-0849) |
| DOI | 10.3847/1538-4357/aa96ac |
| 通讯作者 | Gajjar, V.(vishalg@berkeley.edu) |
| 英文摘要 | 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. |
| WOS关键词 | PULSAR RADIO-EMISSION ; SUBPULSE-DRIFT ; INTENSITY MEASUREMENTS ; MODULATION PROPERTIES ; COMPTON-SCATTERING ; EMPIRICAL-THEORY ; PERIODIC NULLS ; MODE ; TELESCOPE ; DISCOVERY |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000425487400002 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22340]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Gajjar, V. |
| 作者单位 | 1.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 |
| 推荐引用方式 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):15. |
| 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),15. |
| MLA | Gajjar, V.,et al."On Nulling, Drifting, and Their Interactions in PSRs J1741-0840 and J1840-0840".ASTROPHYSICAL JOURNAL 850.2(2017):15. |
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来源：紫金山天文台
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