The MeerKAT Pulsar Timing Array: Maps of the gravitational wave sky with the 4.5-yr data release Article Swipe
Kathrin Grunthal
,
Rowina S Nathan
,
E. Thrane
,
D. J. Champion
,
Matthew T. Miles
,
R. M. Shannon
,
Atharva Kulkarni
,
Federico Abbate
,
S. Buchner
,
A D Cameron
,
M. Geyer
,
Pratyasha Gitika
,
M. J. Keith
,
M. Kramer
,
P. D. Lasky
,
A. Parthasarathy
,
Daniel J. Reardon
,
Jaikhomba Singha
,
V. Venkatraman Krishnan
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stae2573
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stae2573
In an accompanying publication, the MeerKAT Pulsar Timing Array (MPTA) Collaboration reports tentative evidence for the presence of a stochastic gravitational wave background, following observations of similar signals from the European and Indian Pulsar Timing Arrays, the North American Nanohertz Observatory for Gravitational Waves, the Parkes Pulsar Timing Array, and the Chinese Pulsar Timing Array. If such a gravitational wave background signal originates from a population of inspiraling supermassive black hole binaries, the signal may be anisotropically distributed in the sky. In this paper, we evaluate the anisotropy of the MPTA signal using a spherical harmonic decomposition. We discuss complications arising from the covariance between pulsar pairs and the regularization of the Fisher matrix. Applying our method to the $4.5 \hbox{-}\text{yr}$ data set, we obtain two forms of sky maps for the three most sensitive MPTA frequency bins between $7 \ {\rm and} \ 21 \, {\rm nHz}$. Our ‘clean maps’ estimate the distribution of gravitational wave strain power with minimal assumptions. Our radiometer maps answer the question: Is there a statistically significant point source? We find a noteworthy hotspot in the $7 \, \mathrm{nHz}$ clean map with a p-factor of $p=0.015$ (not including trial factors). Future observations are required to determine if this hotspot is of astrophysical origin.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stae2573
- OA Status
- gold
- Cited By
- 6
- References
- 92
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4405034100
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4405034100Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1093/mnras/stae2573Digital Object Identifier
- Title
-
The MeerKAT Pulsar Timing Array: Maps of the gravitational wave sky with the 4.5-yr data releaseWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2024Year of publication
- Publication date
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2024-12-03Full publication date if available
- Authors
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Kathrin Grunthal, Rowina S Nathan, E. Thrane, D. J. Champion, Matthew T. Miles, R. M. Shannon, Atharva Kulkarni, Federico Abbate, S. Buchner, A D Cameron, M. Geyer, Pratyasha Gitika, M. J. Keith, M. Kramer, P. D. Lasky, A. Parthasarathy, Daniel J. Reardon, Jaikhomba Singha, V. Venkatraman KrishnanList of authors in order
- Landing page
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https://doi.org/10.1093/mnras/stae2573Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
-
goldOpen access status per OpenAlex
- OA URL
-
https://doi.org/10.1093/mnras/stae2573Direct OA link when available
- Concepts
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Sky, Pulsar, Physics, Gravitational wave, Astronomy, Astrophysics, Geodesy, Remote sensing, GeologyTop concepts (fields/topics) attached by OpenAlex
- Cited by
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6Total citation count in OpenAlex
- Citations by year (recent)
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2025: 5, 2024: 1Per-year citation counts (last 5 years)
- References (count)
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92Number of works referenced by this work
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-
10Other works algorithmically related by OpenAlex
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