Preprint PUBDB-2022-06831

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A gamma-ray pulsar timing array constrains the nanohertz gravitational wave background

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2022

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Report No.: arXiv:2204.05226

Abstract: After large galaxies merge, their central supermassive black holes are expected to form binary systems. Their orbital motion should generate a gravitational wave background (GWB) at nanohertz frequencies. Searches for this background use pulsar timing arrays, which perform long-term monitoring of millisecond pulsars at radio wavelengths. We used 12.5 years of Fermi Large Area Telescope data to form a gamma-ray pulsar timing array. Results from 35 bright gamma-ray pulsars place a 95% credible limit on the GWB characteristic strain of 1.0 × 10$^{−14}$ at a frequency of 1 year$^{–1}$. The sensitivity is expected to scale with tobs, the observing time span, as $t^{−13/6}_{obs}$. This direct measurement provides an independent probe of the GWB while offering a check on radio noise models.

Keyword(s): gravitational radiation: background ; pulsar ; gamma ray ; binary ; noise ; monitoring ; black hole ; radio wave ; GLAST ; galaxy

Classification:

Note: ISSN 1095-9203 not unique: **3 hits**.3 figures in the main text. 3 figures and 8 tables are in the supplementary material

Contributing Institute(s):
  1. Astroteilchenphysik (ZEU-EXP/AT)
Research Program(s):
  1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)
Experiment(s):
  1. The Fermi Large Area Telescope

Appears in the scientific report 2022
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http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article  ;  ;  ; et al
A gamma-ray pulsar timing array constrains the nanohertz gravitational wave background
Science / Science now 376(6592), 521 - 523 () [10.1126/science.abm3231]  GO arXiv  Download fulltext Files  Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS


 Record created 2022-11-18, last modified 2023-02-14


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