Outburst of the 2 s Anomalous X-ray Pulsar 1E 1547.0-5408 Export

@misc{citeulike:2000900, abstract = {Following our discovery of radio pulsations from the newly recognized Anomalous X-ray Pulsar (AXP) 1E 1547.0-5408, we initiated X-ray monitoring with the Swift X-ray Telescope, and obtained a single target-of-opportunity observation with the Newton X-ray Multi-Mirror Mission (XMM-Newton). In comparison with its historic minimum flux of 3e-13 ergs cm^-2 s^-1, the source was found to be in a record high state, f\_X(1-8 keV) = 5e-12 ergs cm^-2 s^-1, or L\_X = 1.7e35(d/9 kpc)^2 ergs s^-1, and declining by 25\% in 1 month. Extrapolating the decay, we bound the total energy in this outburst to 1e42 \< E \< 1e43 ergs. The spectra (fitted with a Comptonized blackbody) show that an increase in the temperature and area of a hot region, to 0.5 keV and \~{}16\% of the surface area of the neutron star, respectively, are primarily responsible for its increase in luminosity. The energy, spectrum, and timescale of decay are consistent with a deep crustal heating event, similar to an interpretation of the X-ray turn-on of the transient AXP XTE J1810-197. Simultaneous with the 4.6 hour XMM-Newton observation, we observed at 6.4 GHz with the Parkes telescope, measuring the phase relationship of the radio and X-ray pulse. The X-ray pulsed fraction of 1E 1547.0-5408 is only \~{}7\%, while its radio pulse is relatively broad for such a slow pulsar, which may indicate a nearly aligned rotator. As also inferred from the transient behavior of XTE J1810-197, the only other AXP known to emit in the radio, the magnetic field rearrangement responsible for this X-ray outburst of 1E 1547.0-5408 is probably the cause of its radio turn-on.}, archivePrefix = {arXiv}, author = {Halpern, J. P. and Gotthelf, E. V. and Reynolds, J. and Ransom, S. M. and Camilo, F.}, citeulike-article-id = {2000900}, citeulike-linkout-0 = {http://arxiv.org/abs/0711.3780}, citeulike-linkout-1 = {http://arxiv.org/pdf/0711.3780}, day = {23}, eprint = {0711.3780}, keywords = {1547, magnetar, outburst, radio}, month = {Nov}, posted-at = {2007-11-28 06:22:25}, priority = {2}, title = {Outburst of the 2 s Anomalous X-ray Pulsar 1E 1547.0-5408}, url = {http://arxiv.org/abs/0711.3780}, year = {2007} }

TY - ELEC ID - citeulike:2000900 L3 - citeulike-article-id:2000900 N2 - Following our discovery of radio pulsations from the newly recognized Anomalous X-ray Pulsar (AXP) 1E 1547.0-5408, we initiated X-ray monitoring with the Swift X-ray Telescope, and obtained a single target-of-opportunity observation with the Newton X-ray Multi-Mirror Mission (XMM-Newton). In comparison with its historic minimum flux of 3e-13 ergs cm^-2 s^-1, the source was found to be in a record high state, f_X(1-8 keV) = 5e-12 ergs cm^-2 s^-1, or L_X = 1.7e35(d/9 kpc)^2 ergs s^-1, and declining by 25% in 1 month. Extrapolating the decay, we bound the total energy in this outburst to 1e42 < E < 1e43 ergs. The spectra (fitted with a Comptonized blackbody) show that an increase in the temperature and area of a hot region, to 0.5 keV and ~16% of the surface area of the neutron star, respectively, are primarily responsible for its increase in luminosity. The energy, spectrum, and timescale of decay are consistent with a deep crustal heating event, similar to an interpretation of the X-ray turn-on of the transient AXP XTE J1810-197. Simultaneous with the 4.6 hour XMM-Newton observation, we observed at 6.4 GHz with the Parkes telescope, measuring the phase relationship of the radio and X-ray pulse. The X-ray pulsed fraction of 1E 1547.0-5408 is only ~7%, while its radio pulse is relatively broad for such a slow pulsar, which may indicate a nearly aligned rotator. As also inferred from the transient behavior of XTE J1810-197, the only other AXP known to emit in the radio, the magnetic field rearrangement responsible for this X-ray outburst of 1E 1547.0-5408 is probably the cause of its radio turn-on. TI - Outburst of the 2 s Anomalous X-ray Pulsar 1E 1547.0-5408 KW - 1547 KW - magnetar KW - outburst KW - radio AU - Halpern, JP AU - Gotthelf, EV AU - Reynolds, J AU - Ransom, SM AU - Camilo, F PY - 2007/Nov/23/ UR - http://arxiv.org/abs/0711.3780 ER -