Precision pulsar timing with the ORT and the GMRT and its applications in pulsar astrophysics

Journal of Astrophysics and Astronomy

A. GOPAKUMAR^9¹  DEBADES BANDYOPADHYAY^4²  ARPITA CHOUDHARY^2³  P. K. MANOHARAN^1,10⁴  KISHALAY DE^8⁵  M. A. KRISHNAKUMAR^1,10⁶  YOGESH MAAN^11⁷  NEELAM DHANDA BATRA^5,6⁸  SURYARAO BETHAPUDI^7⁹  AVISHEK BASU^1^1,10  MANJARI BAGCHI^2,3^1,11  Y. GUPTA^1^1,12  BHAL CHANDRA JOSHI^1^1,13  L. DEY^9^1,14  PRAKASH ARUMUGASAMY^1^1,15 

[1] ASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.^11;Astroparticle Physics and Cosmology Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata 700 064, India.^4;Cahill Centre for Astrophysics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.^8;Center for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV, USA.^15;Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Dr. Homi Bhabha Road, Mumbai 400 005, India.^9;Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India.^13;Department of Physics and Astronomy, West Virginia University, P. O. Box 6315, Morgantown, WV, USA.^14;Department of Physics, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Shameerpet Mandal, Hyderabad 500 078, India.^6;Department of Physics, Indian Institute of Technology Hyderabad, Kandi, Hyderabad 502 285, India.^7;Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi 110 016, India.^5;Homi Bhabha National Institute Training School Complex, Anushakti Nagar, Mumbai 400 094, India.^3;Mcgill Space Institute, McGill University, Montreal, Canada.^12;National Centre for Radio Astrophysics (Tata Institute of Fundamental Research), Post Bag No 3, Ganeshkhind, Pune 411 007, India.^1;Radio Astronomy Centre (NCRA-TIFR), Ooty, India.^10;The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai 600 113, India.^2

关键词: Equation of state;    gravitational waves;    pulsars: general;    stars: neutron.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Radio pulsars show remarkable clock-like stability, which make them useful astronomy tools in experiments to test equation of state of neutron stars and detecting gravitational waves using pulsar timing techniques. A brief review of relevant astrophysical experiments is provided in this paper highlighting thecurrent state-of-the-art of these experiments. A program to monitor frequently glitching pulsars with Indian radio telescopes using high cadence observations is presented, with illustrations of glitches detected in this program, including the largest ever glitch in PSR B0531 $+$ 21. An Indian initiative to discover sub-$\mu$Hz gravitational waves, called Indian Pulsar Timing Array (InPTA), is also described briefly, where time-of-arrival uncertainties and post-fit residuals of the order of $\mu$s are already achievable, comparable to other international pulsar timing array experiments. While timing the glitches and their recoveries are likely to provide constraints on the structure of neutron stars, InPTA will provide upper limits on sub-$\mu$Hz gravitational waves apart from auxiliary pulsarscience. Future directions for these experiments are outlined.

【 授权许可】

CC BY