157 citations · 358 across the 8 of their papers we have counts for
8 papers
Evidence of an Energetic Magnetar Powering 1LHAASO J05004454
J. A. J. Alford, J. D. Gelfand, M. Abdelmaguid +1
We investigate the origin of unidentified, extended TeV source 1LHAASO J05004454, considering three possible origins: cosmic rays interacting with a molecular cloud (MC), partic…
Do Central Compact Objects have Carbon Atmospheres?
J. A. J. Alford, J. P. Halpern
Only three of the dozen central compact objects (CCOs) in supernova remnants (SNRs) show thermal X-ray pulsations due to non-uniform surface temperature (hot-spots). The absence of…
Measuring the Non-Axially-Symmetric Surface Temperature Distribution of the Central Compact Object in Puppis A
J. A. J. Alford, E. V. Gotthelf, R. Perna +1
The surface temperature distributions of central compact objects (CCOs) are powerful probes of their crustal magnetic field strengths and geometries. Here we model the surface temp…
The X-ray evolution and geometry of the 2018 outburst of XTE J1810-197
A. Borghese, N. Rea, R. Turolla +17
After 15 years, in late 2018, the magnetar XTE J1810-197 underwent a second recorded X-ray outburst event and reactivated as a radio pulsar. We initiated an X-ray monitoring campai…
The 2018 X-ray and Radio Outburst of Magnetar XTE J1810-197
E. V. Gotthelf, J. P. Halpern, J. A. J. Alford +11
We present the earliest X-ray observations of the 2018 outburst of XTE J1810-197, the first outburst since its 2003 discovery as the prototypical transient and radio-emitting anoma…
Radio disappearance of the magnetar XTE J1810-197 and continued X-ray timing
F. Camilo, S. M. Ransom, J. P. Halpern +6
We report on timing, flux density, and polarimetric observations of the transient magnetar and 5.54 s radio pulsar XTE J1810-197 using the GBT, Nancay, and Parkes radio telescopes…
Evolution of the X-ray Properties of the Transient Magnetar XTE J1810-197
Jason Alford, Jules Halpern
We report on X-ray observations of the 5.54 s transient magnetar XTE J1810-197 using the XMM-Newton and Chandra observatories, analyzing new data from 2008 through 2014, and re-ana…
The Spin-down of PSR J0821-4300 and PSR J1210-5226: Confirmation of Central Compact Objects as Anti-Magnetars
E. V. Gotthelf, J. P. Halpern, J. Alford
Using XMM-Newton and Chandra, we measure period derivatives for the second and third known pulsars in the class of Central Compact Objects (CCOs) in supernova remnants, proving tha…