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Optical and X-ray Follow-Up to a Globular Cluster Ultraluminous X-ray Source in NGC 4472
Wasundara R. Athukoralalage, Kristen C. Dage, Stephen E. Zepf +4
NGC 4472 is home to five ultraluminous X-ray sources hosted by globular clusters. These sources have been suggested as good black hole candidates in extragalactic globular clusters…
Intermediate-mass black holes and the fundamental plane of black hole accretion
Kayhan Gültekin, Kristina Nyland, Nichole Gray +7
We present new 5 GHz VLA observations of a sample of 8 active intermediate-mass black holes with masses found in galaxies with stellar masses $…
The NICER "Reverberation Machine": A Systematic Study of Time Lags in Black Hole X-Ray Binaries
Jingyi Wang, Erin Kara, Matteo Lucchini +12
We perform the first systematic search of all NICER archival observations of black hole (and candidate) low-mass X-ray binaries for signatures of reverberation. Reverberation lags…
Radius Constraints from Reflection Modeling of Cygnus X-2 with NuSTAR and NICER
R. M. Ludlam, E. M. Cackett, J. A. García +8
We present a spectral analysis of NuSTAR and NICER observations of the luminous, persistently accreting neutron star (NS) low-mass X-ray binary Cygnus X-2. The data were divided in…
The luminosity-dependent contribution from the broad line region to the wavelength-dependent lags in Mrk 110
F. M. Vincentelli, I. McHardy, V. Hernández Santisteban +5
We have measured the wavelength-dependent lags between the X-ray, UV and optical bands in the high accretion rate () Active Galactic Nucleus Mrk 110 durin…