Artículo
Simultaneous NICER and NuSTAR observations of the ultraluminous source NGC 4190 ULX-1
Combi, Jorge Ariel
; Fogantini, Federico Adrián
; Saavedra, Enzo Agustin; Romero, Gustavo Esteban
; Abaroa, Leandro
; García, Federico
; Luque Escamilla, Pedro L.; Martí, Josep; Cruz Sanchez, , Nelson
Fecha de publicación:
06/2024
Editorial:
EDP Sciences
Revista:
Astronomy and Astrophysics
ISSN:
0004-6361
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present an X-ray analysis of three different XMM-Newton observations together with simultaneous NICER and NuSTAR observations of the ultraluminous X-ray source NGC 4190 ULX-1. Our goal is to constrain the structure of the accretion disk and the geometrical properties of the source. We performed a temporal and spectral analyses in the 0.4--30 keV energy range where the source is significantly detected in dedicated XMM-Newton, NICER and NuSTAR observations. The temporal analysis shows no flaring activity in the light curves. No pulsation is detected throughout. The source exhibits a typical ULX spectrum, which can be fitted with two thermal blackbody components plus a Comptonization tail at high energies. The luminosity-temperature relation of each thermal spectral component is consistent with the L∝T2 relation expected from an advection-dominated supercritical disk. We interpret these results as a super-Eddington accreting black hole seen almost face-on. A dense wind ejected from the disk obscures the central source, and a hot electron plasma is evacuated through the funnel formed above the hole. Geometric beaming is responsible for the ULX soft emission, whereas the hard tail is the result of Comptonization of soft photons by the electrons ejected through the funnel.
Palabras clave:
acretion
,
accretion disk
,
X-ray: binaries
,
X-ray: individual: NGC 4190 ULX-1
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Articulos(IAR)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Citación
Combi, Jorge Ariel; Fogantini, Federico Adrián; Saavedra, Enzo Agustin; Romero, Gustavo Esteban; Abaroa, Leandro; et al.; Simultaneous NICER and NuSTAR observations of the ultraluminous source NGC 4190 ULX-1; EDP Sciences; Astronomy and Astrophysics; 686; A121; 6-2024; 1-9
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