On the Enhanced X-ray Emission from SGR 1900+14 after the August 27 Giant Flare

Abstract

We show that the giant flares of soft-gamma ray repeaters (E~10^44 ergs) can push the inner regions of a fall-back disk out to larger radii by radiation pressure, while matter remains bound to the system for plausible parameters. The subsequent relaxation of this pushed-back matter can account for the observed enhanced X-ray emission after the August 27 giant flare of SGR 1900+14. Based on the results of our models, we estimate that the ratio of the fluences of the enhanced X-ray emissions to that of the preceding bursts remains constant for a particular SGR with similar preburst inner disk conditions, which is consistent with the four different burst observations of SGR 1900+14.

arXiv comment13 pages, 3 figures, accepted for publication in ApJL

References in corpus (12)

• A giant, periodic flare from the soft gamma repeater SGR1900+14
• An Accretion Model for Anomalous X-Ray Pulsars
• On Young Neutron Stars as Propellers and Accretors with Conventional Magnetic Fields
• The Giant Flare of 1998 August 27 from SGR 1900+14: I. An Interpretive Study of BeppoSAX and Ulysses Observations
• Physical Mechanisms for the Variable Spin-down of SGR 1900+14
• Evidence for a Sudden Magnetic Field Reconfiguration in SGR 1900+14
• The Discovery of an Embedded Cluster of High-Mass Stars Near SGR 1900+14
• Diagnosing magnetars with transient cooling
• An Extended Burst Tail from SGR 1900+14 with a Thermal X-ray Spectrum
• Deep Radio, Optical, and Infrared Observations of SGR 1900+14
• On the Outbursts of Soft X-ray Transients
• The 4.5 +/- 0.5 Soft Gamma Repeaters in Review

Cited by in corpus (19)

• The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
• Anomalous X-ray pulsars: Persistent States with Fallback Disks
• On the evolution of anomalous X-ray pulsars and soft gamma ray repeaters with fallback disks
• Correlated Infrared and X-ray Flux Changes Following the 2002 June Outburst of the Anomalous X-ray Pulsar 1E 2259+586
• An accretion model for the anomalous X-ray pulsar 4U 0142+61
• A QED Model for the Origin of Bursts from SGRs and AXPs
• Where Are All The Fallback Disks? Constraints on Propeller Systems
• Topology of magnetars external field. I. Axially symmetric fields
• The Anomalous X-Ray Pulsar 4U 0142+61: A Neutron Star with a Gaseous Fallback Disk
• The Energy Spectrum of Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters
• Optical and Infrared Emission from the AXPs and SGRs
• On the Infrared, Optical and High Energy Emission from the Anomalous X-Ray Pulsar 4U 0142+615
• On the X-Ray Light Curve, Pulsed-Radio Emission, and Spin Frequency Evolution of the Transient Anomalous X-Ray Pulsar Xte J1810--197 During its X-Ray Outburst
• X-Ray and Infrared Enhancement of Anomalous X-ray Pulsar 1E 2259+58
• Ultra-luminous X-ray sources as super-critical propellers
• Classification of pulsars with Dirichlet process Gaussian mixture model
• On the X-ray Outbursts of Transient Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters
• Non-LTE modeling of supernova-fallback disks
• A magnetar outburst with atypical evolution: the case of Swift J1555.2-5402