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Lookup NU author(s): Dr Anne ArchibaldORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023. The Author(s). Published by the American Astronomical Society.We present observations and timing analyses of 68 millisecond pulsars (MSPs) comprising the 15 yr data set of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). NANOGrav is a pulsar timing array (PTA) experiment that is sensitive to low-frequency gravitational waves (GWs). This is NANOGrav’s fifth public data release, including both “narrowband” and “wideband” time-of-arrival (TOA) measurements and corresponding pulsar timing models. We have added 21 MSPs and extended our timing baselines by 3 yr, now spanning nearly 16 yr for some of our sources. The data were collected using the Arecibo Observatory, the Green Bank Telescope, and the Very Large Array between frequencies of 327 MHz and 3 GHz, with most sources observed approximately monthly. A number of notable methodological and procedural changes were made compared to our previous data sets. These improve the overall quality of the TOA data set and are part of the transition to new pulsar timing and PTA analysis software packages. For the first time, our data products are accompanied by a full suite of software to reproduce data reduction, analysis, and results. Our timing models include a variety of newly detected astrometric and binary pulsar parameters, including several significant improvements to pulsar mass constraints. We find that the time series of 23 pulsars contain detectable levels of red noise, 10 of which are new measurements. In this data set, we find evidence for a stochastic GW background.
Author(s): Agazie G, Alam MF, Anumarlapudi A, Archibald AM, Arzoumanian Z, Baker PT, Blecha L, Bonidie V, Brazier A, Brook PR, Burke-Spolaor S, Becsy B, Chapman C, Charisi M, Chatterjee S, Cohen T, Cordes JM, Cornish NJ, Crawford F, Cromartie HT, Crowter K, DeCesar ME, Demorest PB, Dolch T, Drachler B, Ferrara EC, Fiore W, Fonseca E, Freedman GE, Garver-Daniels N, Gentile PA, Glaser J, Good DC, Gultekin K, Hazboun JS, Jennings RJ, Jessup C, Johnson AD, Jones ML, Kaiser AR, Kaplan DL, Kelley LZ, Kerr M, Key JS, Kuske A, Laal N, Lam MT, Lamb WG, Lazio TJW, Lewandowska N, Lin Y, Liu T, Lorimer DR, Luo J, Lynch RS, Ma C-P, Madison DR, Maraccini K, McEwen A, McKee JW, McLaughlin MA, McMann N, Meyers BW, Mingarelli CMF, Mitridate A, Ng C, Nice DJ, Ocker SK, Olum KD, Panciu E, Pennucci TT, Perera BBP, Pol NS, Radovan HA, Ransom SM, Ray PS, Romano JD, Salo L, Sardesai SC, Schmiedekamp C, Schmiedekamp A, Schmitz K, Shapiro-Albert BJ, Siemens X, Simon J, Siwek MS, Stairs IH, Stinebring DR, Stovall K, Susobhanan A, Swiggum JK, Taylor SR, Turner JE, Unal C, Vallisneri M, Vigeland SJ, Wahl HM, Wang Q, Witt CA, Young O
Publication type: Article
Publication status: Published
Journal: Astrophysical Journal Letters
Year: 2023
Volume: 951
Issue: 1
Print publication date: 01/07/2023
Online publication date: 29/06/2023
Acceptance date: 31/05/2023
Date deposited: 02/08/2023
ISSN (print): 2041-8205
ISSN (electronic): 2041-8213
Publisher: American Astronomical Society
URL: https://doi.org/10.3847/2041-8213/acda9a
DOI: 10.3847/2041-8213/acda9a
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