2024ApJ...963..144A

Query : 2024ApJ...963..144A

2024ApJ...963..144A - Astrophys. J., 963, 144 (2024/March-2)

The NANOGrav 12.5 yr Data Set: A Computationally Efficient Eccentric Binary Search Pipeline and Constraints on an Eccentric Supermassive Binary Candidate in 3C 66B.

AGAZIE G., ARZOUMANIAN Z., BAKER P.T., BECSY B., BLECHA L., BLUMER H., BRAZIER A., BROOK P.R., BURKE-SPOLAOR S., CASEY-CLYDE J.A., CHARISI M., CHATTERJEE S., CHEESEBORO B.D., COHEN T., CORDES J.M., CORNISH N.J., CRAWFORD F., CROMARTIE H.T., DECESAR M.E., DEMOREST P.B., DEY L., DOLCH T., ELLIS J.A., FERDMAN R.D., FERRARA E.C., FIORE W., FONSECA E., FREEDMAN G.E., GARVER-DANIELS N., GENTILE P.A., GLASER J., GOOD D.C., GOPAKUMAR A., GULTEKIN K., HAZBOUN J.S., JENNINGS R.J., JOHNSON A.D., JONES M.L., KAISER A.R., KAPLAN D.L., KELLEY L.Z., KEY J.S., LAAL N., LAM M.T., LAMB W.G., LAZIO T.J.W., LEWANDOWSKA N., LIU T., LORIMER D.R., LUO J., LYNCH R.S., MA C.-P., MADISON D.R., McEWEN A., McKEE J.W., McLAUGHLIN M.A., MEYERS P.M., MINGARELLI C.M.F., MITRIDATE A., NG C., NICE D.J., OCKER S.K., OLUM K.D., PENNUCCI T.T., POL N.S., RADOVAN H.A., RANSOM S.M., RAY P.S., ROMANO J.D., SARDESAI S.C., SCHMITZ K., SIEMENS X., SIMON J., SIWEK M.S., SOSA FISCELLA S.V., SPIEWAK R., STAIRS I.H., STINEBRING D.R., STOVALL K., SUSOBHANAN A., SWIGGUM J.K., TAYLOR S.R., TURNER J.E., UNAL C., VALLISNERI M., VIGELAND S.J., WITT C.A., YOUNG O. (The NANOGrav Collaboration)

Abstract (from CDS):

The radio galaxy 3C 66B has been hypothesized to host a supermassive black hole binary (SMBHB) at its center based on electromagnetic observations. Its apparent 1.05 yr period and low redshift (∼0.02) make it an interesting testbed to search for low-frequency gravitational waves (GWs) using pulsar timing array (PTA) experiments. This source has been subjected to multiple searches for continuous GWs from a circular SMBHB, resulting in progressively more stringent constraints on its GW amplitude and chirp mass. In this paper, we develop a pipeline for performing Bayesian targeted searches for eccentric SMBHBs in PTA data sets, and test its efficacy by applying it to simulated data sets with varying injected signal strengths. We also search for a realistic eccentric SMBHB source in 3C 66B using the NANOGrav 12.5 yr data set employing PTA signal models containing Earth term-only as well as Earth+pulsar term contributions using this pipeline. Due to limitations in our PTA signal model, we get meaningful results only when the initial eccentricity e₀ < 0.5 and the symmetric mass ratio η > 0.1. We find no evidence for an eccentric SMBHB signal in our data, and therefore place 95% upper limits on the PTA signal amplitude of 88.1 ± 3.7 ns for the Earth term-only and 81.74 ± 0.86 ns for the Earth+pulsar term searches for e₀ < 0.5 and η > 0.1. Similar 95% upper limits on the chirp mass are (1.98 ± 0.05) × 10⁹and (1.81 ± 0.01) × 10⁹M_☉. These upper limits, while less stringent than those calculated from a circular binary search in the NANOGrav 12.5 yr data set, are consistent with the SMBHB model of 3C 66B developed from electromagnetic observations.

Journal keyword(s): Gravitational waves - Millisecond pulsars - Supermassive black holes

Simbad objects: 7

Full paper

View the references in ADS

Number of rows : 7

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	Z 538-57	Sy1	02 23 11.41124925	+42 59 31.3853324	15.71	14.81		~	582	2
2	PG 0851+202	BLL	08 54 48.8749846272	+20 06 30.639583620	15.649	15.146	15.446	~	2513	1
3	PSR J1713+0747	Psr	17 13 49.5367813	+07 47 37.450240				~	530	1
4	PSR B1855+09	Psr	18 57 36.390620	+09 43 17.20712				DA	569	1
5	PSR J1909-3744	Psr	19 09 47.42820	-37 44 14.7740				~	343	2
6	PSR J1946+3417	Psr	19 46 25.13182	+34 17 14.6770				~	64	0
7	PSR J2322+2057	Psr	23 22 22.320041	+20 57 02.50080				~	129	1

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