Tomonosuke Kikunaga

Improving DM estimates using low-frequency scatter-broadening estimates

Jaikhomba Singha, B. C. Joshi, M. A. Krishnakumar, F. Kareem et autres

ABSTRACT A pulsar’s pulse profile gets broadened at low frequencies due to dispersion along the line of sight or due to multipath propagation. The dynamic nature of the interstellar medium makes both of these effects time-dependent and introduces slowly varying time delays …

in, Afrique du Sud, de, jp, au, us (code pays fourni par la source)

The second data release from the European Pulsar Timing Array

John Antoniadis, P. Arumugam, S. Arumugam, S. Babak et autres

We present the results of a search for continuous gravitational wave signals (CGWs) in the second data release (DR2) of the European Pulsar Timing Array (EPTA) Collaboration. The most significant candidate event from this search has a gravitational wave frequency of 4–5 …

Comparing Recent Pulsar Timing Array Results on the Nanohertz Stochastic Gravitational-wave Background

Gabriella Agazie, John Antoniadis, Akash Anumarlapudi, Anne M. Archibald et autres

Abstract The Australian, Chinese, European, Indian, and North American pulsar timing array (PTA) collaborations recently reported, at varying levels, evidence for the presence of a nanohertz gravitational-wave background (GWB). Given that each PTA made different choices in modeling their data, we perform …

us, de, gr, gb, in, au, fr, nl, it, cn, ca, pl, jp (code pays fourni par la source)

低周波重力波の検出へ向けた電波パルサーの広帯域観測

Tomonosuke Kikunaga

The second data release from the European Pulsar Timing Array

John Antoniadis, P. Arumugam, S. Arumugam, S. Babak et autres

The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA) collaborations have measured a low-frequency common signal in the combination of their second and first data releases, respectively, with the correlation properties of a gravitational wave background (GWB). Such a …

fr, in, gb, de, it, jp, nl, ie (code pays fourni par la source)

Low-frequency pulse-jitter measurement with the uGMRT I: PSR J0437–4715

Tomonosuke Kikunaga, Shinnosuke Hisano, Neelam Dhanda Batra, S. Desai et autres

Abstract High-precision pulsar timing observations are limited in their accuracy by the jitter noise that appears in the arrival time of pulses. Therefore, it is important to systematically characterise the amplitude of the jitter noise and its variation with frequency. In this …

au, jp, in, Afrique du Sud (code pays fourni par la source)

Improving DM estimates using low-frequency scatter-broadening estimates

Jaikhomba Singha, B. C. Joshi, Moochickal Ambalappat ; https://orcid.org/0000-0003-4528-2745 Krishnakumar, Fazal Kareem et autres

Singha J, Joshi BC, Krishnakumar MA, et al. Improving DM estimates using low-frequency scatter-broadening estimates. Monthly Notices of the Royal Astronomical Society. 2024;535(1):1184-1192.

Low-frequency pulse-jitter measurement with the uGMRT I : PSR J0437$-$4715

Tomonosuke Kikunaga, Shinnosuke Hisano, Neelam Dhanda Batra, S. Desai et autres

High-precision pulsar timing observations are limited in their accuracy by the jitter noise that appears in the arrival time of pulses. Therefore, it is important to systematically characterise the amplitude of the jitter noise and its variation with frequency. In this paper, …

au, jp, in, Afrique du Sud (code pays fourni par la source)

Multiband extension of the wideband timing technique

Avinash Kumar Paladi, C. Dwivedi, Prerna Rana, K. Nobleson et autres

ABSTRACT The wideband timing technique enables the high-precision simultaneous estimation of pulsar times of arrival (ToAs) and dispersion measures (DMs) while effectively modelling frequency-dependent profile evolution. We present two novel independent methods that extend the standard wideband technique to handle simultaneous multiband …

in, us, de, jp, pr (code pays fourni par la source)

Improving DM estimates using low-frequency scattering-broadening estimates

Jaikhomba Singha, B. C. Joshi, M. A. Krishnakumar, Adarsh Bathula et autres

A pulsar's pulse profile gets broadened at low frequencies due to dispersion along the line of sight or due to multi-path propagation. The dynamic nature of the interstellar medium makes both of these effects time-dependent and introduces slowly varying time delays in …

Comparing Recent Pulsar Timing Array Results on the Nanohertz Stochastic Gravitational-wave Background

Gabriella Agazie, Z. Arzoumanian, Jacob Askew, A. -S. Bak Nielsen et autres

The Australian, Chinese, European, Indian, and North American pulsar timing array (PTA) collaborations recently reported, at varying levels, evidence for the presence of a nanohertz gravitational-wave background (GWB). Given that each PTA made different choices in modeling their data, we perform a …

Noise analysis of the Indian Pulsar Timing Array data release I

Aman Srivastava, S. Desai, Neel Kolhe, Mayuresh Surnis et autres

The Indian Pulsar Timing Array (InPTA) collaboration has recently made its first official data release (DR1) for a sample of 14 pulsars using 3.5 years of uGMRT observations. We present the results of single-pulsar noise analysis for each of these 14 pulsars …

in, us, it, jp, de (code pays fourni par la source)