Sep 8 – 13, 2019
Europe/Rome timezone
All inquiries about receipts for the payment of the conference fee and/or dinner should be addressed to: a.vriz@fondazionealmamater.it, d.bordignon@fondazionealmamater.it

X-Ray Census of Millisecond Pulsars in the Galactic Field

Sep 13, 2019, 3:17 PM
1m

Speaker

Mr Lee Jongsu (Chungnam National University)

Description

We have conducted a systematic survey for the X-ray properties of millisecond pulsars (MSPs). Currently, there are 47 MSPs with confirmed X-ray detections. We have also placed the upper limits for the X-ray emission from the other 36 MSPs by using the archival data. We have normalized their X-ray luminosities L x and their effective photon indices Γ into a homogeneous data set, which enables us to carry out a detailed statistical analysis. Based on our censored sample, we report a relation of ${L}x≃ {10}^{31.05}{(\dot{E}/{10}^{35})}^{1.31} erg s^-1$ (2-10 keV) for the MSPs. The inferred X-ray conversion efficiency is found to be lower than the previously reported estimate that could be affected by selection bias. L x also correlates/anti-correlates with the magnetic field strength at the light cylinder B LC/characteristic age τ. On the other hand, there is no correlation between L x and their surface magnetic field strength B s . We have further divided the sample into four classes: (i) black-widows, (ii) redbacks, (iii) isolated MSPs, and (iv) other MSP binaries, and compare the properties among them. We noted that while the rotational parameters and the orbital periods of redbacks and black-widows are similar, L x of redbacks are significantly higher than those of black-widows in the 2-10 keV band. Also the Γ of redbacks are apparently smaller than those of black-widows, which indicates that the X-ray emission of redbacks are harder than that of black-widows. This can be explained by the different contribution of intrabinary shocks in the X-ray emission of these two classes.

Affiliation Chungnam National University
Topic Compact and diffuse sources in galaxies and in the Galactic Center

Primary authors

Mr Lee Jongsu (Chungnam National University) Prof. Hui C. Y. (Chungnam National University)

Co-authors

Prof. Takata Jumpei (Huazhong University of Science and Technology) Prof. Kong A. K. H. (National Tsing Hua University) Prof. Tam P. H. T. (Sun Yat-sen University) Prof. Cheng K. S. (University of Hong Kong)

Presentation materials

There are no materials yet.