13 citations · 76 across the 16 of their papers we have counts for
18 papers
Scaling Up: A Global Optical/X-ray Correlation For Reprocessing Across Black Hole Masses
Changhyun Cho, David M. Russell, Aaryan Sharma +9
This study extends the optical/X-ray correlation from black hole low-mass X-ray binaries (XRBs) to active galactic nuclei (AGN), bridging scales from stellar-mass to supermassive b…
Dynamical chiral symmetry breaking in rotating QED: critical flavor number and the occupation-reweighting channel
Wei Li
We study dynamical chiral symmetry breaking in -dimensional QED on a rigidly rotating disc, , within the rainbow Schwinger--Dyson framework. At zero temperature the…
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 NICER view of the corona through time-dependent Comptonization of the quasi-periodic oscillations in nine black-hole X-ray binaries
Yuexin Zhang, Mariano Méndez, James F. Steiner +12
We present a systematic study of the evolution of the corona geometry in nine black hole X-ray binaries (BHXRBs) using archival data from NICER. We identify 171 observations exhibi…
Exotic optical variability in the black hole X-ray binary IGR J17091-3624
Payaswini Saikia, David M. Russell, D. M. Bramich +9
IGR J17091-3624 is a distinctive black hole X-ray binary exhibiting exotic variability, including complex "heartbeat" oscillations in its X-ray light curves, similar to those obser…
Aql X-1 from dawn 'til dusk: the early rise, fast state transition and decay of its 2024 outburst
A. Marino, F. Coti Zelati, K. Alabarta +36
Transient Low-Mass X-ray Binaries (LMXBs) are usually first detected by all-sky X-ray monitors when they enter new outbursts, typically at X-ray luminosities above 10…
Tracking optical variability and outflows across the accretion states of the black hole transient MAXI J1820+070
M. C. Baglio, K. Alabarta, D. M. Russell +10
We present a study of the minute-timescale optical variability and spectroscopic outflow signatures in the black hole X-ray binary MAXI J1820+070 during its 2018 outburst and re-br…
Infrared Synchrotron Emission in the Soft State of GX 339-4 and the Mid-Infrared/X-ray Luminosity Plane of Black Hole X-ray Binaries
P. Gandhi, D. M. Russell, M. C. Baglio +33
Progress in understanding the growth of accreting black holes remains hampered by a lack of sensitive coordinated multiwavelength observations. In particular, the mid-infrared (MIR…
A Hidden Pulse: Uncovering a New Timing Signal in Cygnus X-1 with AstroSat
Sandeep K. Rout, Federico Garcia, Mariano Mendez +4
The study of fast variability properties in X-ray binaries advances our understanding of the physical processes and geometric properties of the accretion flow around the compact ob…
The orbital period and inclination of the neutron star X-ray transient MAXI J1807+132
E. A. Saavedra, T. Muñoz-Darias, M. A. P. Torres +7
The neutron star X-ray transient MAXI J1807+132 has undergone outbursts in 2017, 2019, and 2023. We conducted an -band time series photometry campaign using the Isaac Newton Tel…
A Multi-wavelength Characterization of the 2023 Outburst of MAXI J1807+132: Manifestations of Disk Instability and Jet Emission
Sandeep K. Rout, M. Cristina Baglio, Andrew Hughes +19
Several phenomenological aspects of low-luminosity neutron star transients, such as atolls, remain poorly understood. One such source, MAXI J1807+132, entered its latest outburst i…
Timing analysis of the black-hole candidate Swift J1727.8-1613: detection of a dip-like feature in the high-energy cross spectrum
Pei Jin, Mariano Méndez, Federico García +3
We present a timing analysis of observations with the Hard X-ray Modulation Telescope of the black hole X-ray transient Swift J1727.8-1613 during its 2023 outburst. We detect, for…
Evolution of the Accretion Disk and Corona During the Outburst of the Neutron Star Transient MAXI J1807+132
Sandeep K. Rout, Teo Munoz-Darias, Jeroen Homan +4
Low-mass X-ray binaries with a neutron star as the primary object show a complex array of phenomenology during outbursts. The observed variability in X-ray emission primarily arise…
The X-ray corona in the black-hole binary GRO J1655--40 from the properties of non-harmonically related quasi-periodic oscillations
Sandeep K. Rout, Mariano Mendez, Federico Garcia
The study of quasi periodic oscillations (QPOs) plays a vital role in understanding the nature and geometry of the Comptonizing medium around black-hole X-ray binaries. The spectra…
Revisiting the galactic X-ray binary MAXI J1631-479: Implications for high inclination and a massive black hole
Sandeep K. Rout, Santosh Vadawale, Javier Garcia +1
X-ray spectroscopy of galactic black hole binaries serve as a powerful tool to gain an overall understanding of the system. Not only can the properties of the accretion disk be stu…
Spectral and timing evolution of MAXI J1631-479 during the 2018-19 outburst with NICER
Sandeep K. Rout, Mariano Méndez, Tomaso M. Belloni +1
The X-ray transient MAXI J1631-479 went into outburst on 2018 December 21 and remained active for about seven months. Owing to various constraints it was monitored by NICER only du…
Multi-wavelength view of the galactic black-hole binary GRS 1716-249
Sandeep K. Rout, Santosh V. Vadawale, Aarthy E. +5
The origins of X-ray and radio emissions during an X-ray binary outburst are comparatively better understood than those of ultraviolet, optical and infrared radiation. This is beca…
A retrograde spin of the black hole in MAXI J1659--152
Sandeep K. Rout, Santosh Vadawale, Mariano Méndez
We present the results of spectral analysis of the galactic black-hole binary MAXI J1659--152 in the rising phase of the outburst that lasted for about 65 days starting on 2010 Sep…