Atomic Nuclear Physics

Density waves in solids by George Gruner

By George Gruner

Discusses the theoretical and experimental situation of 2 novel forms of damaged symmetry flooring states of metals, cost, and spin density waves. DLC: cost density waves.

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J. : Astrophys. J. : Astron. Astrophys. : Astrophys. J. : Astrophys. J. : Mon. Not. Roy. Astron. Soc. : Astrophys. J. : Astrophys. J. : Astrophys. J. : In: Compact Stellar X-ray Sources, p. 547. V. 2007 Abstract We present a systematic analysis of all the BeppoSAX data of SGR1900+14. The observations spanning five years show that the source was brighter than usual on two occasions: ∼20 days after the August 1998 giant flare and during the 105 s long X-ray afterglow following the April 2001 intermediate flare.

The total fluency of the IR enhancement between June and October 2004 is about 1041 erg (we assumed AV = 29 ± 2; see Eikenberry et al. 2004), a factor of about 100 smaller than that in the 2–10 keV band. Based on the above reported findings we note that the SGR 1806–20 emission varies in a similar fashion (in terms of timescale and amplitude of variation) over more than five orders of magnitude in photon energy. The similar flux variation in the IR and X-ray bands suggests that the emission in the two bands has a similar, if not the same, origin.

Although extremely strong, such a field is fully plausible given that a (mainly toroidal) field in excess of 1016 G is required to power the SGR 1806–20 flux during its whole life if one speculate that repeated giant flares of this magnitude over the ∼104 yr lifetime occurred in the past. Motivated by our discovery of QPOs (or GSOs) in the X-ray flux of SGR 1806–20, Strohmayer and Watts (2005) looked for such kind of QPOs in the X-ray flux of the giant flare of SGR 1900+14, serendipitously recorded again by RXTE on 28th August 1998.

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