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1. An Updated Mass–Radius Analysis of the 2017–2018 NICER Data Set of PSR J0030+0451

Author

Vinciguerra, Serena, primary, Salmi, Tuomo, additional, Watts, Anna L., additional, Choudhury, Devarshi, additional, Riley, Thomas E., additional, Ray, Paul S., additional, Bogdanov, Slavko, additional, Kini, Yves, additional, Guillot, Sebastien, additional, Chakrabarty, Deepto, additional, Ho, Wynn C. G., additional, Huppenkothen, Daniela, additional, Morsink, Sharon M., additional, Wadiasingh, Zorawar, additional, and Wolff, Michael T., additional

Published
2024
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4. The Radius of PSR J0740+6620 from NICER with NICER Background Estimates

Author

Salmi, Tuomo, primary, Vinciguerra, Serena, additional, Choudhury, Devarshi, additional, Riley, Thomas E., additional, Watts, Anna L., additional, Remillard, Ronald A., additional, Ray, Paul S., additional, Bogdanov, Slavko, additional, Guillot, Sebastien, additional, Arzoumanian, Zaven, additional, Chirenti, Cecilia, additional, Dittmann, Alexander J., additional, Gendreau, Keith C., additional, Ho, Wynn C. G., additional, Miller, M. Coleman, additional, Morsink, Sharon M., additional, Wadiasingh, Zorawar, additional, and Wolff, Michael T., additional

Published
2022
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5. Constraining the Neutron Star Mass–Radius Relation and Dense Matter Equation of State with NICER. I. The Millisecond Pulsar X-Ray Data Set

Author

Bogdanov, Slavko, primary, Guillot, Sebastien, additional, Ray, Paul S., additional, Wolff, Michael T., additional, Chakrabarty, Deepto, additional, Ho, Wynn C. G., additional, Kerr, Matthew, additional, Lamb, Frederick K., additional, Lommen, Andrea, additional, Ludlam, Renee M., additional, Milburn, Reilly, additional, Montano, Sergio, additional, Miller, M. Coleman, additional, Bauböck, Michi, additional, Özel, Feryal, additional, Psaltis, Dimitrios, additional, Remillard, Ronald A., additional, Riley, Thomas E., additional, Steiner, James F., additional, Strohmayer, Tod E., additional, Watts, Anna L., additional, Wood, Kent S., additional, Zeldes, Jesse, additional, Enoto, Teruaki, additional, Okajima, Takashi, additional, Kellogg, James W., additional, Baker, Charles, additional, Markwardt, Craig B., additional, Arzoumanian, Zaven, additional, and Gendreau, Keith C., additional

Published
2019
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6. Constraining the Neutron Star Mass–Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star

Author

Bogdanov, Slavko, primary, Lamb, Frederick K., additional, Mahmoodifar, Simin, additional, Miller, M. Coleman, additional, Morsink, Sharon M., additional, Riley, Thomas E., additional, Strohmayer, Tod E., additional, Tung, Albert K., additional, Watts, Anna L., additional, Dittmann, Alexander J., additional, Chakrabarty, Deepto, additional, Guillot, Sebastien, additional, Arzoumanian, Zaven, additional, and Gendreau, Keith C., additional

Published
2019
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10. BURST AND OUTBURST CHARACTERISTICS OF MAGNETAR 4U 0142+61

Author

Göğüş, Ersin, primary, Lin, Lin, additional, Roberts, Oliver J., additional, Chakraborty, Manoneeta, additional, Kaneko, Yuki, additional, Gill, Ramandeep, additional, Granot, Jonathan, additional, Horst, Alexander J. van der, additional, Watts, Anna L., additional, Baring, Matthew, additional, Kouveliotou, Chryssa, additional, Huppenkothen, Daniela, additional, and Younes, George, additional

Published
2017
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12. MAGNETAR-LIKE X-RAY BURSTS FROM A ROTATION-POWERED PULSAR, PSR J1119–6127

Author

Göğüş, Ersin, primary, Lin, Lin, additional, Kaneko, Yuki, additional, Kouveliotou, Chryssa, additional, Watts, Anna L., additional, Chakraborty, Manoneeta, additional, Alpar, M. Ali, additional, Huppenkothen, Daniela, additional, Roberts, Oliver J., additional, Younes, George, additional, and van der Horst, Alexander J., additional

Published
2016
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13. DISSECTING MAGNETAR VARIABILITY WITH BAYESIAN HIERARCHICAL MODELS

Author

Huppenkothen, Daniela, primary, Brewer, Brendon J., additional, Hogg, David W., additional, Murray, Iain, additional, Frean, Marcus, additional, Elenbaas, Chris, additional, Watts, Anna L., additional, Levin, Yuri, additional, Horst, Alexander J. van der, additional, and Kouveliotou, Chryssa, additional

Published
2015
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16. BROADBAND SPECTRAL INVESTIGATIONS OF SGR J1550–5418 BURSTS

Author

Lin, Lin, primary, Göğüş, Ersin, additional, Baring, Matthew G., additional, Granot, Jonathan, additional, Kouveliotou, Chryssa, additional, Kaneko, Yuki, additional, van der Horst, Alexander, additional, Gruber, David, additional, von Kienlin, Andreas, additional, Younes, George, additional, Watts, Anna L., additional, and Gehrels, Neil, additional

Published
2012
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17. DETECTION OF SPECTRAL EVOLUTION IN THE BURSTS EMITTED DURING THE 2008-2009 ACTIVE EPISODE OF SGR J1550–5418

Author

von Kienlin, Andreas, primary, Gruber, David, additional, Kouveliotou, Chryssa, additional, Granot, Jonathan, additional, Baring, Matthew G., additional, Göğüş, Ersin, additional, Huppenkothen, Daniela, additional, Kaneko, Yuki, additional, Lin, Lin, additional, Watts, Anna L., additional, Bhat, Narayana P., additional, Guiriec, Sylvain, additional, van der Horst, Alexander J., additional, Bissaldi, Elisabetta, additional, Greiner, Jochen, additional, Meegan, Charles A., additional, Paciesas, William S., additional, Preece, Robert D., additional, and Rau, Arne, additional

Published
2012
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18. BURST AND PERSISTENT EMISSION PROPERTIES DURING THE RECENT ACTIVE EPISODE OF THE ANOMALOUS X-RAY PULSAR 1E 1841–045

Author

Lin, Lin, primary, Kouveliotou, Chryssa, additional, Göğüş, Ersin, additional, van der Horst, Alexander J., additional, Watts, Anna L., additional, Baring, Matthew G., additional, Kaneko, Yuki, additional, Wijers, Ralph A. M. J., additional, Woods, Peter M., additional, Barthelmy, Scott, additional, Michael Burgess, James, additional, Chaplin, Vandiver, additional, Gehrels, Neil, additional, Goldstein, Adam, additional, Granot, Jonathan, additional, Guiriec, Sylvain, additional, Mcenery, Julie, additional, Preece, Robert D., additional, Tierney, David, additional, van der Klis, Michiel, additional, von Kienlin, Andreas, additional, and Zhang, Shuang Nan, additional

Published
2011
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19. Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS

Author

Lin, Lin, primary, Kouveliotou, Chryssa, additional, Baring, Matthew G., additional, van der Horst, Alexander J., additional, Guiriec, Sylvain, additional, Woods, Peter M., additional, Göğüş, Ersin, additional, Kaneko, Yuki, additional, Scargle, Jeffrey, additional, Granot, Jonathan, additional, Preece, Robert, additional, von Kienlin, Andreas, additional, Chaplin, Vandiver, additional, Watts, Anna L., additional, Wijers, Ralph A. M. J., additional, Zhang, Shuang Nan, additional, Bhat, Narayan, additional, Finger, Mark H., additional, Gehrels, Neil, additional, Harding, Alice, additional, Kaper, Lex, additional, Kaspi, Victoria, additional, Mcenery, Julie, additional, Meegan, Charles A., additional, Paciesas, William S., additional, Pe'er, Asaf, additional, Ramirez-Ruiz, Enrico, additional, van der Klis, Michiel, additional, Wachter, Stefanie, additional, and Wilson-Hodge, Colleen, additional

Published
2011
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20. PHOTOSPHERIC RADIUS EXPANSION DURING MAGNETAR BURSTS

Author

Watts, Anna L., primary, Kouveliotou, Chryssa, additional, van der Horst, Alexander J., additional, Göğüş, Ersin, additional, Kaneko, Yuki, additional, van der Klis, Michiel, additional, Wijers, Ralph A. M. J., additional, Harding, Alice K., additional, and Baring, Matthew G., additional

Published
2010
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21. ERRATUM: “MAGNETAR TWISTS:FERMI/GAMMA-RAY BURST MONITOR DETECTION OF SGR J1550-5418” (2010, ApJ, 710, 1335)

Author

Kaneko, Yuki, primary, Göğüş, Ersin, additional, Kouveliotou, Chryssa, additional, Granot, Jonathan, additional, Ramirez-Ruiz, Enrico, additional, van der Horst, Alexander J., additional, Watts, Anna L., additional, Finger, Mark H., additional, Gehrels, Neil, additional, Pe'er, Asaf, additional, van der Klis, Michiel, additional, von Kienlin, Andreas, additional, Wachter, Stefanie, additional, Wilson-Hodge, Colleen A., additional, and Woods, Peter M., additional

Published
2010
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22. MAGNETAR TWISTS:FERMI/GAMMA-RAY BURST MONITOR DETECTION OF SGR J1550-5418

Author

Kaneko, Yuki, primary, Göğüş, Ersin, additional, Kouveliotou, Chryssa, additional, Granot, Jonathan, additional, Ramirez-Ruiz, Enrico, additional, van der Horst, Alexander J., additional, Watts, Anna L., additional, Finger, Mark H., additional, Gehrels, Neil, additional, Pe'er, Asaf, additional, van der Klis, Michiels, additional, von Kienlin, Andreas, additional, Wachter, Stefanie, additional, Wilson-Hodge, Colleen A., additional, and Woods, Peter M., additional

Published
2010
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31. MAGNETAR TWISTS: FERMI/GAMMA-RAY BURST MONITOR DETECTION OF SGR J1550-5418

Author

Kaneko, Yuki, Gogus, Ersin, Kouveliotou, Chryssa, Granot, Jonathan, Ramirez, Enrico, van, Alexander J., Horst, der, Watts, Anna L., Finger, Mark H., Gehrels, Neil, Pe, Asaf, van, Michiels, Klis, der, von, Andreas, Wachter, Stefanie, Wilson, Colleen A., and Woods, Peter M.

Abstract

SGR J1550-5418 (previously known as AXP 1E 1547.0-5408 or PSR J1550-5418) went into three active bursting episodes in 2008 October and in 2009 January and March, emitting hundreds of typical soft gamma repeater bursts in soft gamma rays. The second episode was especially intense, and our untriggered burst search on Fermi/Gamma-ray Burst Monitor (GBM) data (8-1000 keV) revealed [?]450 bursts emitted over 24 hr during the peak of this activity. Using the GBM data, we identified a [?]150 s long enhanced persistent emission during 2009 January 22 that exhibited intriguing timing and spectral properties: (1) clear pulsations up to [?]110 keV at the spin period of the neutron star (P [?] 2.07 s, the fastest of all magnetars); (2) an additional (to a power-law) blackbody component required for the enhanced emission spectra with kT [?] 17 keV; and (3) pulsed fraction that is strongly energy dependent and highest in the 50-74 keV energy band. A total isotropic-equivalent energy emitted during this enhanced emission is estimated to be 2.9 x 1040(D/5 kpc)2 erg. The estimated area of the blackbody emitting region of [?]0.046(D/5 kpc)2 km2 (roughly a few x10-5 of the neutron star area) is the smallest "hot spot" ever measured for a magnetar and most likely corresponds to the size of magnetically confined plasma near the neutron star surface.

Published
2010

32. The 2004 Hyperflare from SGR 1806-20: Further Evidence for Global Torsional Vibrations

Author

Strohmayer, Tod E. and Watts, Anna L.

Abstract

We report an analysis of archival RXTE data from the 2004 December hyperflare from SGR 1806-20. In addition to the [?]90 Hz QPO first discovered by Israel et al., we report the detection of higher frequency oscillations at [?]150, 625, and 1840 Hz. We also find evidence of oscillations at [?]720, and 2384 Hz, but with lower significances. The 150 Hz QPO has a width (FWHM) of about 17 Hz, an average amplitude (rms) of 6.8% and is associated with the strongest peak in the pulse profile. The 625 Hz oscillation was detected in an average power spectrum from nine successive cycles beginning approximately 180 s after the initial hard spike. It has a width (FWHM) of [?]2 Hz and an average amplitude (rms) during this interval of 8.5%. We find a strong detection of the 625 Hz oscillation in a pair of successive rotation cycles beginning about 230 s after the start of the flare. In these cycles we also detect the 1840 Hz QPO. When the 625 Hz QPO is detected we also confirm the simultaneous presence of 30 and 92 Hz QPOs. The centroid frequency of the 625 Hz QPO detected with RXTE is within 1 Hz of the [?]626 Hz oscillation recently found in RHESSI data by Watts & Strohmayer. We argue that these new findings provide further evidence for a connection of these oscillations with global oscillation modes of neutron stars, in particular, the high-frequency signals may represent toroidal modes with at least one radial node in the crust. We discuss their implications in the context of this model and for the depth of neutron star crusts.

Published
2006

33. ERRATUM: "MAGNETAR TWISTS: FERMI/GAMMA-RAY BURST MONITOR DETECTION OF SGR J1550-5418" (2010, ApJ, 710, 1335)

Author

Kaneko, Yuki, Gogus, Ersin, Kouveliotou, Chryssa, Granot, Jonathan, Ramirez, Enrico, van, Alexander J., Horst, der, Watts, Anna L., Finger, Mark H., Gehrels, Neil, Pe, Asaf, van, Michiel, Klis, der, von, Andreas, Wachter, Stefanie, Wilson, Colleen A., and Woods, Peter M.

Abstract

As a result of an error at the publisher, the name of the author Michiel van der Klis and his affiliation were misspelled. The corrected version appears above. IOP Publishing sincerely regrets this error.

Published
2010

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