Lognormal Properties of SGR 1806-20 and Implications for Other SGR Sources
نویسنده
چکیده
The time interval between successive bursts from SGR 1806-20 and the intensity of these bursts are both consistent with lognormal distributions. Monte Carlo simulations of lognormal burst models with a range of distribution parameters have been investigated. The main conclusions are that while most sources like SGR 1806-20 should be detected in a time interval of 25 years, sources with means about 100 times longer have a probability of about 5% of being detected in the same interval. A new breed of experiments that operate for long periods are required to search for sources with mean recurrence intervals much longer than SGR 1806-20.
منابع مشابه
Precise Localization of the Soft Gamma Repeater SGR 1627−41 and the Anomalous X-ray Pulsar AXP 1E1841−045 with Chandra
We present precise localizations of AXP 1E1841−045 and SGR 1627−41 with Chandra. We obtained new infrared observations of SGR 1627−41 and reanalyzed archival observations of AXP 1E1841−045 in order to refine their positions and search for infrared counterparts. A faint source is detected inside the error circle of AXP 1E1841−045. In the case of SGR 1627−41, several sources are located within th...
متن کاملStatistical Properties of SGR 1806-20 Bursts.
We present statistics of SGR 1806-20 bursts, combining 290 events detected with the Rossi X-Ray Timing Explorer/Proportional Counter Array, 111 events detected with the Burst and Transient Source Experiment, and 134 events detected with the International Cometary Explorer. We find that the fluence distribution of bursts observed with each instrument are well described by power laws with indices...
متن کاملThe Effects of Burst Activity on Soft Gamma Repeater Pulse Properties and Persistent Emission
Soft Gamma Repeaters (SGRs) undergo changes in their pulse properties and persistent emission during episodes of intense burst activity. SGR 1900+14 has undergone large flux increases following recent burst activity. Both SGR 1900+14 and SGR 1806−20 have shown significant changes in their pulse profile and spindown rates during the last several years. The pulse profile changes are linked with t...
متن کاملPrecise Chandra Localization of the Soft Gamma - ray Repeater SGR 1806 − 20
We present observations of the Soft γ-ray Repeater SGR 1806−20 taken with the Chandra X-ray Observatory. We identify the X-ray counterpart of SGR 1806−20 based on detection of 7.5-s pulsations. Using three unrelated X-ray sources (and USNO stars) as position references, we are able to determine that the SGR is at α2000 = 18 0839. 32 and δ2000 = −2
متن کاملA Re-brightening of the Radio Nebula Associated with the 2004 December 27 Giant Flare from Sgr 1806–20
On 2004 Dec. 27, a giant γ-ray flare was detected from the magnetar SGR 1806–20. A radio observation seven days later revealed an expanding radio nebula at this position. Here we present results from an on-going monitoring campaign of this source with the Australia Telescope Compact Array and Very Large Array. These data indicate that there was an increase in the observed flux ∼25 days after th...
متن کامل