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VERY LONG BASELINE INTERFEROMETRY MEASURED PROPER MOTION AND PARALLAX OF THE gamma-RAY MILLISECOND PULSAR PSR J0218+4232
Du, Yuanjie; Yang, Jun; Campbell, Robert M.; Janssen, Gemma; Stappers, Ben; Chen, Ding; Du, YJ (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, 1 Nanertiao, Beijing 100190, Peoples R China.
Department空间技术部
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2014
Volume782Issue:2Pages:L38
ISSN2041-8205
Language英语
KeywordAstrometry Pulsars: General Pulsars: Individual (Psr j0218+4232)
AbstractPSR J0218+4232 is a millisecond pulsar (MSP) with a flux density similar to 0.9 mJy at 1.4 GHz. It is very bright in the high-energy X-ray and gamma-ray domains. We conducted an astrometric program using the European VLBI Network (EVN) at 1.6 GHz to measure its proper motion and parallax. A model-independent distance would also help constrain its gamma-ray luminosity. We achieved a detection of signal-to-noise ratio S/N > 37 for the weak pulsar in all five epochs. Using an extragalactic radio source lying 20 arcmin away from the pulsar, we estimate the pulsar's proper motion to be mu(alpha) cos delta = 5.35 +/- 0.05 mas yr (1) and mu(delta) = -3.74 +/- 0.12 mas yr (1), and a parallax of pi = 0.16 +/- 0.09 mas. The very long baseline interferometry (VLBI) proper motion has significantly improved upon the estimates from long-term pulsar timing observations. The VLBI parallax provides the first model-independent distance constraints: d = 6.3(-2.3)(+8.0) kpc, with a corresponding 3 sigma lower-limit of d = 2.3 kpc. This is the first pulsar trigonometric parallax measurement based solely on EVN observations. Using the derived distance, we believe that PSR J0218+4232 is the most energetic gamma-ray MSP known to date. The luminosity based on even our 3 sigma lower-limit distance is high enough to pose challenges to the conventional outer gap and slot gap models.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/2723
Collection空间技术部
Corresponding AuthorDu, YJ (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, 1 Nanertiao, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Du, Yuanjie,Yang, Jun,Campbell, Robert M.,et al. VERY LONG BASELINE INTERFEROMETRY MEASURED PROPER MOTION AND PARALLAX OF THE gamma-RAY MILLISECOND PULSAR PSR J0218+4232[J]. ASTROPHYSICAL JOURNAL LETTERS,2014,782(2):L38.
APA Du, Yuanjie.,Yang, Jun.,Campbell, Robert M..,Janssen, Gemma.,Stappers, Ben.,...&Du, YJ .(2014).VERY LONG BASELINE INTERFEROMETRY MEASURED PROPER MOTION AND PARALLAX OF THE gamma-RAY MILLISECOND PULSAR PSR J0218+4232.ASTROPHYSICAL JOURNAL LETTERS,782(2),L38.
MLA Du, Yuanjie,et al."VERY LONG BASELINE INTERFEROMETRY MEASURED PROPER MOTION AND PARALLAX OF THE gamma-RAY MILLISECOND PULSAR PSR J0218+4232".ASTROPHYSICAL JOURNAL LETTERS 782.2(2014):L38.
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