155 citations · 969 across the 26 of their papers we have counts for
26 papers
Photospheric Radius Expansion and a double-peaked type-I X-ray burst from GRS 1741.9-2853
Sean N. Pike, Fiona A. Harrison, John A. Tomsick +6
We present analysis of two type-I X-ray bursts observed by NuSTAR originating from the very faint transient neutron star low-mass X-ray binary GRS 1741.9-2853 during a period of ou…
Nitrogen X-ray absorption in the local ISM
Efrain Gatuzz, Javier A. García, Timothy R. Kallman
Nitrogen is one of the most abundant metals in the interstellar medium (ISM), and thus it constitutes an excellent test to study a variety of astrophysical environments, ranging fr…
Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-Timing Analysis
Jingyi Wang, Guglielmo Mastroserio, Erin Kara +14
We analyze 5 epochs of NICER data of the black hole X-ray binary MAXI J1820+070 during the bright hard-to-soft state transition in its 2018 outburst with both reflection spectrosco…
Disturbing Reinforcement Learning Agents with Corrupted Rewards
Rubén Majadas, Javier García, Fernando Fernández
Reinforcement Learning (RL) algorithms have led to recent successes in solving complex games, such as Atari or Starcraft, and to a huge impact in real-world applications, such as c…
The XSTAR Atomic Database
Claudio Mendoza, Manuel A. Bautista, Jérôme Deprince +7
We describe the atomic database of the XSTAR spectral modeling code, summarizing the systematic upgrades carried out in the past twenty years to enable the modeling of K lines from…
A Comprehensive X-ray Report on AT2019wey
Yuhan Yao, S. R. Kulkarni, K. C. Gendreau +25
Here, we present MAXI, SWIFT, NICER, NuSTAR and Chandra observations of the X-ray transient AT2019wey (SRGA J043520.9+552226, SRGE J043523.3+552234). From spectral and timing analy…
Accurate Treatment of Comptonization in X-ray Illuminated Accretion Disks
Javier A. García, Ekaterina Sokolova-Lapa, Thomas Dauser +5
A large fraction of accreting black hole and neutron stars systems present clear evidence of the reprocessing of X-rays in the atmosphere of an optically-thick accretion disk. The…
NICER-NuSTAR Observations of the Neutron Star Low-Mass X-ray Binary 4U 1735-44
R. M. Ludlam, E. M. Cackett, J. A. García +8
We report on the first simultaneous and observations of the neutron star (NS) low-mass X-ray binary 4U 173544, obtained in 2018 August. The source was at a lumi…
The spin measurement of the black hole in 4U 1543-47 constrained with the X-ray reflected emission
Yanting Dong, Javier A. García, James F. Steiner +1
4U 1543-47 is a low mass X-ray binary which harbours a stellar-mass black hole located in our Milky Way galaxy. In this paper, we revisit 7 data sets which were in the Steep Power…
A detailed study on the reflection component for the Black Hole Candidate MAXI J1836-194
Yanting Dong, Javier A. García, Zhu Liu +3
We present a detailed spectral analysis of the black hole candidate MAXI J1836-194. The source was caught in the intermediate state during its 2011 outburst by Suzaku and RXTE. We…
Evolution of the accretion disk-corona during bright hard-to-soft state transition: A reflection spectroscopic study with GX 339-4
Navin Sridhar, Javier A. García, James F. Steiner +3
We present the analysis of several observations of the black hole binary GX 339--4 during its bright intermediate states from two different outbursts (2002 and 2004), as observed b…
Relativistic reflection and reverberation in GX 339-4 with NICER and NuSTAR
Jingyi Wang, Erin Kara, James Steiner +8
We analyze seven NICER and NuSTAR epochs of the black hole X-ray binary GX 339-4 in the hard state during its two most recent hard-only outbursts in 2017 and 2019. These observatio…
The 2017 Failed Outburst of GX 339-4: Relativistic X-ray Reflection near the Black Hole Revealed by NuSTAR and Swift Spectroscopy
Javier A. García, John A. Tomsick, Navin Sridhar +12
We report on the spectroscopic analysis of the black hole binary GX 339-4 during its recent 2017-2018 outburst, observed simultaneously by the Swift and NuSTAR observatories. Altho…
A public relativistic transfer function model for X-ray reverberation mapping of accreting black holes
Adam Ingram, Guglielmo Mastroserio, Thomas Dauser +3
We present the publicly available model \textsc{reltrans} that calculates the light-crossing delays and energy shifts experienced by X-ray photons originally emitted close to the b…
Probing the Black Hole Engine with Measurements of the Relativistic X-ray Reflection Component
Javier A. García, Matteo Bachetti, David R. Ballantyne +21
Over the last decades X-ray spectroscopy has proven to be a powerful tool for the estimation of black hole spin and several other key parameters in dozens of AGN and black hole X-r…
High Density Reflection Spectroscopy I. A case study of GX~339-4
Jiachen Jiang, Andrew C. Fabian, Jingyi Wang +5
We present a broad band spectral analysis of the black hole binary GX~339-4 with NuSTAR and Swift using high density reflection model. The observations were taken when the source w…
On the discrepancy between the X-ray and UV absorption measurements of OVI in the local ISM
Efraín Gatuzz, Javier A. García, Timothy R. Kallman
The total amount of OVI present in the interstellar medium (ISM) obtained via absorption measurements in UV and X-ray spectra is currently in disagreement, with the latter being si…
Relativistic Reflection: Review and Recent Developments in Modeling
Thomas Dauser, Javier A. García, Jörn Wilms
Measuring relativistic reflection is an important tool to study the innermost regions of the an accreting black hole system. In the following we present a brief review on the diffe…
Reflection Spectroscopy of the Black Hole Binary XTE J1752-223 in its Long-Stable Hard State
Javier A. García, James F. Steiner, Victoria Grinberg +7
We present a detailed spectral analysis of the Black Hole Binary XTE J1752-223 in the hard state of its 2009 outburst. Regular monitoring of this source by RXTE provided high signa…
3D mapping of the neutral X-ray absorption in the local interstellar medium: The Gaia and XMM-Newton synergy
Efraín Gatuzz, S. Rezaei Kh., Timothy R. Kallman +4
We present a three-dimensional map of the hydrogen density distribution in the Galactic interstellar medium. The hydrogen equivalent column densities were obtained from the Explori…
The evolution of GX 339-4 in the low-hard state as seen by NuSTAR and Swift
Jingyi Wang-Ji, Javier A. García, James F. Steiner +7
We analyze eleven NuSTAR and Swift observations of the black hole X-ray binary GX 339-4 in the hard state, six of which were taken during the end of the 2015 outburst, five during…
On the detectability of CO molecules in the Interstellar Medium via X-ray spectroscopy
Katerine Joachimi, Efraín Gatuzz, Javier A. García +1
We present a study of the detectability of CO molecules in the Galactic interstellar medium using high-resolution X-ray spectra obtained with the XMM-Newton Reflection Grating Spec…
Oxygen, neon, and iron X-ray absorption in the local interstellar medium
Efraín Gatuzz, Javier A. García, Timothy R. Kallman +1
We present a detailed study of X-ray absorption in the local interstellar medium by analyzing the X-ray spectra of 24 galactic sources obtained with the {\it Chandra} High Energy T…
An Empirical Method for Improving the Quality of RXTE HEXTE Spectra
Javier A. García, Victoria Grinberg, James F. Steiner +3
We have developed a correction tool to improve the quality of RXTE HEXTE spectra by employing the same method we used earlier to improve the quality of RXTE PCA spectra. We fit all…