28 citations · 55 across the 11 of their papers we have counts for
12 papers
A Galactic microblazar as a potential accelerator of ultra-high-energy particles
Josep Martí, Pedro L. Luque-Escamilla, Benito Marcote +10
Context. Persistent jets from X-ray binaries which are aligned very close to the line of sight could be considered to be Galactic equivalents of blazars, or 'microblazars'. They ar…
The IACOB project XVIII. Prevalence of short-period binaries among Galactic helium rich O-type stars
C. Martínez-Sebastián, R. Gamen, O. G. Benvenuto +6
For decades, the origin of helium enrichment in O-type stars has remained an open question. In this study, we investigate the correlation between surface helium abundance and orbit…
Superorbital variability in the quiescent black hole X-ray transient A0620-00
Enzo A. Saavedra, Roi Alonso, Teo Muñoz-Darias +10
Quiescent black hole low-mass X-ray binaries provide a key setting for probing accretion physics at low luminosities. A0620-00, the archetypal system in this class, has remained in…
Resolving SLX 1744-299 and SLX 1744-300 in the hard X-ray band: implications for their ultracompact nature
Enzo A. Saavedra, Montserrat Armas Padilla, Teo Muñoz-Darias
Persistent, low-luminosity low-mass X-ray binaries (LMXBs) offer a unique opportunity to study accretion in this poorly understood regime, as well as to unveil new members of the u…
A candidate proton cyclotron feature in the ultraluminous X-ray source NGC 4656 ULX-1
Nelson Cruz-Sanchez, Enzo A. Saavedra, Federico A. Fogantini +6
Ultraluminous X-ray sources represent extreme super-Eddington accretion regimes, and a subset is now known to host highly magnetized neutron stars. However, direct observational pr…
Constraints on cyclotron features and accretion regime in the high-mass X-ray binary 4U 1700-37 from NuSTAR
Lautaro West-Ocampo, Federico A. Fogantini, Enzo A. Saavedra +6
4U 1700-37 is a wind-fed high-mass X-ray binary hosting a compact object, likely a neutron star, accreting from O6.5 Iaf+ supergiant HD 153919. Coherent pulsations not firmly detec…
The hard ultraluminous state of NGC 5055 ULX X-1
N. Cruz-Sanchez, E. A. Saavedra, F. A. Fogantini +2
We present the results of the first broadband X-ray analysis of the ultraluminous X-ray source NGC 5055 ULX X-1, combining simultaneous data from XMMNewton and NuSTAR missions,…
Simultaneous NICER and NuSTAR observations of the Ultraluminous source NGC 4190 ULX-1
Jorge A. Combi, Federico A. Fogantini, Enzo A. Saavedra +6
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. O…
NuSTAR and XMM-Newton observations of the binary 4FGL J1405.1-6119. A -ray emitting microquasar?
Enzo A. Saavedra, Federico A. Fogantini, Gastón J. Escobar +3
4FGL J1405.1-6119 is a high-mass -ray emitting binary that has been studied at several wavelengths. The nature of this type of binary is still under debate, with three possible…
Achromatic rapid flares in hard X-rays in the -ray binary LS I +61-303
Enzo A. Saavedra, Gustavo E. Romero, Valenti Bosch-Ramon +1
We report on the presence of very rapid hard X-ray variability in the -ray binary LS I +61 303. The results were obtained by analysing NuSTAR data, which show two achromatic str…
Relativistic X-Ray Reflection and Photoionised Absorption in the Neutron-Star Low-Mass X-ray Binary GX 13+1
Enzo A. Saavedra, Federico García, Federico A. Fogantini +4
We analysed a dedicated NuSTAR observation of the neutron-star low-mass X-ray binary Z-source GX 13+1 to study the timing and spectral properties of the source. From the colour-col…
A NuSTAR observation of the eclipsing binary system OAO 1657-415: The revival of the cyclotron line
Enzo A. Saavedra, Federico A. Fogantini, Jorge A. Combi +2
OAO 1657-415 is an accreting X-ray pulsar with a high mass companion that has been observed by several telescopes over the years, in different orbital phases. Back in 1999, observa…