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Skip to Search Results- 7Heinke, Craig O.
- 7Sivakoff, Gregory Robert
- 5Bahramian, Arash
- 4Altamirano, Diego
- 4Degenaar, Nathalie
- 4Wijnands, Rudy
- 7Stars: Neutron
- 7X-Rays: Binaries
- 4Accretion
- 3Accretion Discs
- 2Globular Clusters: Individual: Terzan 5
- 2Stars: Black Holes
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2014-01-01
Forestell, Lindsay M., Heinke, Craig O., Cohn, Haldan N., Lugger, P. M., Sivakoff, Gregory Robert, Bogdanov, Slavko, Cool, A. M., Anderson, J.
We combine new and archival Chandra observations of the globular cluster NGC 6752 to create a deeper X-ray source list, and study the faint radio millisecond pulsars (MSPs) of this cluster. We detect four of the five MSPs in NGC 6752, and present evidence for emission from the fifth. The X-rays...
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2012-01-01
Altamirano, Diego, Keek, L., Cumming, A., Sivakoff, Gregory Robert, Heinke, Craig O., Wijnands, Rudy, Degenaar, Nathalie, Homan, Jeroen, Pooley, David
We report on Chandra, Rossi X-ray Timing Explorer (RXTE), Swift/Burst Alert Telescope (BAT) and MAXI observations of an X-ray flare of ∼1 d and subsequent outburst of a transient X-ray source observed in 2011 October–November in the globular cluster Terzan 5. We show that the source is the same...
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2018-01-01
Sanna, Andrea, Bahramian, Arash, Bozzo, E., Heinke, Craig O., Wijnands, Rudy, Degenaar, Nathalie, Maccarone, T., Riggio, Alessandro, Di Salvo, Tiziana, Iaria, Rosario, Burgay, M., Possenti, Andrea, Ferrigno, C., Papitto, A., Sivakoff, Gregory Robert, D'Amico, Nicolo, Burderi, Luciano, Altamirano, Diego
We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597–3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in the globular cluster NGC 6256 at a distance of 9.1 kpc. The X-ray pulsations show a clear Doppler modulation that...
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2016-01-01
Bahramian, Arash, Tetarenko, Alexandra Jean, Sivakoff, Gregory Robert, Tremou, Evangelia, Linares, Manuel, Tudor, Vlad, Miller-Jones, James C. A., Heinke, Craig O., Chomiuk, Laura, Strader, Jay, Altamirano, Diego, Degenaar, Nathalie, Maccarone, Thomas J., Patruno, A., Sanna, Andrea, Wijnands, Rudy
The paper “Disc-Jet Coupling in the Terzan 5 Neutron Star X-ray Binary EXO 1745−248” was published as Tetarenko et al. 2016, MNRAS, 460, 345–355. In Section 3.3 of the paper there is a minor error in equation (1). The correct equation is as follows, (logLR−logLR,c)=logξ+β(logLX−logLX,c). (1) The...
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2018-01-01
Tudor, Vlad, Miller-Jones, James C. A., Knigge, C., Maccarone, Thomas J., Tauris, T. M., Bahramian, Arash, Chomiuk, Laura, Heinke, Craig O., Sivakoff, Gregory Robert, Strader, Jay, Plotkin, Richard M., Soria, Roberto, Albrow, M. D., Anderson, G. E., van den Berg, Maureen, Bernardini, Federico, Bogdanov, Slavko, Britt, Christopher. T., Russell, D. M., Zurek, David R.
To confirm the nature of the donor star in the ultracompact X-ray binary candidate 47 Tuc X9, we obtained optical spectra (3000–10 000 Å) with the Hubble Space Telescope / Space Telescope Imaging Spectrograph. We find no strong emission or absorption features in the spectrum of X9. In particular,...
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2015-01-01
Degenaar, Nathalie, Wijnands, Rudy, Bahramian, Arash, Sivakoff, Gregory Robert, Heinke, Craig O., Brown, E. F., Fridriksson, Joel K., Homan, Jeroen, Cackett, Edward M., Cumming, A., Miller, Jon M., Altamirano, Diego, Pooley, David
When neutron stars reside in transient X-ray binaries, their crustal layers become heated during accretion outbursts and subsequently cool in quiescence. Observing and modelling this thermal response has yielded valuable insight into the physics of neutron star crusts. However, one unresolved...
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2017-01-01
Bahramian, Arash, Heinke, Craig O., Tudor, Vlad, Miller-Jones, James. C. A., Bogdanov, Slavko, Maccarone, Thomas J., Knigge, C., Sivakoff, Gregory Robert, Chomiuk, Laura, Strader, Jay, Garcia, Javier A., Kallman, Timothy
47 Tuc X9 is a low-mass X-ray binary (LMXB) in the globular cluster 47 Tucanae, and was previously thought to be a cataclysmic variable. However, Miller-Jones et al. recently identified a radio counterpart to X9 (inferring a radio/X-ray luminosity ratio consistent with black hole LMXBs), and...