29 citations · 217 across the 19 of their papers we have counts for
20 papers
Phase-resolved X-ray spectroscopy of the Vela pulsar with NICER observations
E. Zubieta, F. García, S. del Palacio +2
PSR J0835-4510 (a.k.a. the Vela pulsar) is the best studied pulsar in the Southern hemisphere given its high radio brightness and large glitch activity. However, its X-ray brightne…
JWST reveals a highly ionized nebula powered by an ultraluminous X-ray source with a massive black hole in the metal-poor galaxy Holmberg II
F. A. Fogantini, P. Zeidler, L. M. Oskinova +9
Recent James Webb Space Telescope (JWST) observations have revealed fine-structure lines of ions with ionization potentials \,eV, such as [Ne\,{\sc v}] and [O\,{\sc iv…
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…
An atypical X-ray variability component in the black hole candidate AT2019wey
Pengcheng Yang, Mariano Méndez, Sandeep K. Rout +5
Recent studies have revealed a notable timing feature in several black hole X-ray binaries (BHXBs) during the soft-to-hard transition at the outburst decay. Within a narrow frequen…
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,…
A hidden quasi-periodic oscillation in Cygnus X-1 revealed by NICER
Federico A. Fogantini, Federico García, Mariano Méndez +2
Cygnus X-1 is a high-mass black hole binary extensively studied since its discovery in 1964. Its rapid X-ray variability provides insights into accretion physics. Unlike other blac…
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…
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 view of SS433: Precessional evolution of the jet-disk system
Federico A. Fogantini, Federico García, Jorge A. Combi +3
SS433 is a Galactic microquasar with powerful outflows (double jet, accretion disk and winds) with well known orbital, precessional and nutational period. In this work we character…
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…
Dips and eclipses in the X-ray binary Swift J1858.6-0814 observed with NICER
D. J. K. Buisson, D. Altamirano, M. Armas Padilla +24
We present the discovery of eclipses in the X-ray light curves of the X-ray binary Swift J1858.6-0814. From these, we find an orbital period of s ($\appro…
Stellar wind structures in the eclipsing binary system IGR J18027-2016
Federico A. Fogantini, Federico García, Jorge A. Combi +1
IGR J18027-2016 is an obscured high-mass X-ray binary formed by a neutron star accreting from the wind of a supergiant companion with a 4.57 day orbital period. The source sh…
Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton-RGS: disc atmosphere or wind?
D. J. K. Buisson, D. Altamirano, M. Díaz Trigo +11
We find soft X-ray emission lines from the X-ray binary Swift J1858.6-0814 in data from XMM-Newton-RGS: N VII, O VII and O VIII, as well as notable residuals short of a detection a…
The variable radio counterpart of Swift J1858.6-0814
J. van den Eijnden, N. Degenaar, T. D. Russell +18
Swift J1858.6-0814 is a transient neutron star X-ray binary discovered in October 2018. Multi-wavelength follow-up observations across the electromagnetic spectrum revealed many in…
The Changing-look Optical Wind of the Flaring X-ray Transient Swift J1858.6-0814
T. Muñoz-Darias, M. Armas Padilla, F. Jiménez-Ibarra +15
We present the discovery of an optical accretion disk wind in the X-ray transient Swift J1858.6-0814. Our 90-spectrum data set, taken with the 10.4m GTC telescope over 8 different…
The dark side of supergiant High-Mass X-ray Binaries
Sylvain Chaty, Francis Fortin, Federico García +1
High Mass X-ray Binaries (HMXB) have been revealed by a wealth of multi-wavelength observations, from X-ray to optical and infrared domain. After describing the 3 different kinds o…
Spectral evolution of the supergiant HMXB IGR J16320-4751 along its orbit using XMM-Newton
Federico García, Federico A. Fogantini, Sylvain Chaty +1
The INTEGRAL satellite has revealed a previously hidden population of absorbed high-mass X-ray binaries (HMXBs) hosting supergiant (SG) stars. Among them, IGR J16320-4751 is a clas…