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Keck/MOSFIRE spectroscopy of five ULX counterparts
M. Heida, P. G. Jonker, M. A. P. Torres +5
We present H-band spectra of the candidate counterparts of five ULXs (two in NGC 925, two in NGC 4136, and Holmberg II X-1) obtained with Keck/MOSFIRE. The candidate counterparts o…
NuSTAR and Swift observations of the very high state in GX 339-4: Weighing the black hole with X-rays
M. L. Parker, J. A. Tomsick, J. A. Kennea +14
We present results from spectral fitting of the very high state of GX~339-4 with NuSTAR and Swift. We use relativistic reflection modelling to measure the spin of the black hole an…
Measuring A Truncated Disk in Aquila X-1
Ashley L. King, John A. Tomsick, Jon M. Miller +14
We present NuSTAR and Swift observations of the neutron star Aquila X-1 during the peak of its July 2014 outburst. The spectrum is soft with strong evidence for a broad Fe Kαline.…
The rhythm of Fairall 9 -- I: Observing the spectral variability with XMM-Newton and NuSTAR
Anne Lohfink, Christopher Reynolds, Ciro Pinto +13
We present a multi-epoch X-ray spectral analysis of the Seyfert 1 galaxy Fairall 9. Our analysis shows that Fairall 9 displays unique spectral variability in that its ratio residua…