2024ApJ...976..203A

Query : 2024ApJ...976..203A

2024ApJ...976..203A - Astrophys. J., 976, 203 (2024/December-1)

Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations.

ABDOLLAHI S., BALDINI L., BARBIELLINI G., BELLAZZINI R., BERENJI B., BISSALDI E., BLANDFORD R.D., BONINO R., BRUEL P., BUSON S., CAMERON R.A., CARAVEO P.A., CASABURO F., CAVAZZUTI E., CHEUNG C.C., CHIARO G., CIPRINI S., COZZOLONGO G., CRISTARELLA ORESTANO P., CUTINI S., D'AMMANDO F., DI LALLA N., DIRIRSA F., DI VENERE L., DOMINGUEZ A., FEGAN S.J., FERRARA E.C., FIORI A., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GARRAPPA S., GASPARRINI D., GERMANI S., GIGLIETTO N., GIORDANO F., GIROLETTI M., GREEN D., GRENIER I.A., GUIRIEC S., HAYS E., HORAN D., KUSS M., LARSSON S., LAURENTI M., LI J., LIODAKIS I., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MALDERA S., MALYSHEV D., MANFREDA A., MARCOTULLI L., MARTI-DEVESA G., MAZZIOTTA M.N., MEREU I., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., NEGRO M., OMODEI N., ORIENTI M., ORLANDO E., ORMES J.F., PANEQUE D., PERRI M., PERSIC M., PESCE-ROLLINS M., PORTER T.A., PRINCIPE G., RAINO S., RANDO R., RANI B., RAZZANO M., REIMER A., REIMER O., SAZ PARKINSON P.M., SCOTTON L., SERINI D., SESANA A., SGRO C., SISKIND E.J., SPANDRE G., SPINELLI P., SUSON D.J., TAJIMA H., TAKAHASHI M.N., TAK D., THAYER J.B., THOMPSON D.J., TORRES D.F., VALVERDE J., VERRECCHIA F. and ZAHARIJAS G.

Abstract (from CDS):

A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in ∼7 yr of data from the Fermi Large Area Telescope. After 15 yr of Fermi sky-survey observations, doubling the total time range, we report >7 cycle gamma-ray modulation with an estimated significance of 4σ against stochastic red noise. Independent determinations of oscillation period and phase in the earlier and the new data are in close agreement (chance probability <0.01). Pulse timing over the full light curve is also consistent with a coherent periodicity. Multiwavelength new data from Swift X-Ray Telescope, Burst Alert Telescope, and UVOT, and from KAIT, Catalina Sky Survey, All-Sky Automated Survey for Supernovae, and Owens Valley Radio Observatory ground-based observatories as well as archival Rossi X-Ray Timing Explorer satellite-All Sky Monitor data, published optical data of Tuorla, and optical historical Harvard plates data are included in our work. Optical and radio light curves show clear correlations with the gamma-ray modulation, possibly with a nonconstant time lag for the radio flux. We interpret the gamma-ray periodicity as possibly arising from a pulsational accretion flow in a sub-parsec binary supermassive black hole system of elevated mass ratio, with orbital modulation of the supplied material and energy in the jet. Other astrophysical scenarios introduced include instabilities, disk and jet precession, rotation or nutation, and perturbations by massive stars or intermediate-mass black holes in polar orbit.

Journal keyword(s): Active galactic nuclei - Blazars - Gamma-rays - Gamma-ray sources - Gamma-ray telescopes - Gamma-ray astronomy - BL Lacertae objects - Jets - High energy astrophysics - Relativistic jets - Galaxy accretion disks - Supermassive black holes

Simbad objects: 4

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Number of rows : 4

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	PG 1553+113	BLL	15 55 43.0440048528	+11 11 24.365649948	14.91	14.72	14.57	13.99	~	672	1
2	4C -02.81	BLL	21 34 10.30958988	-01 53 17.2389056		18.6	19.00	18.87	~	431	1
3	PKS J2158-3013	BLL	21 58 52.0652249880	-30 13 32.118447792		13.36	13.09	12.62	~	1829	1
4	NAME BL Lac	BLL	22 02 43.2913536816	+42 16 39.979416792		15.66	14.72		~	2397	1

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