scholarly journals Vibration-Powered Radiation of Quaking Magnetar

2011 ◽  
Vol 2011 ◽  
pp. 1-5
Author(s):  
S. Bastrukov ◽  
J. W. Yu ◽  
R. X. Xu ◽  
I. Molodtsova
Keyword(s):  
Magnetic Field ◽  
Standard Model ◽  
Energy Conversion ◽  
Gradual Decrease ◽  
X Ray ◽  
The Standard Model ◽  
Seismic Vibrations ◽  
Field Decay

In juxtaposition with the standard model of rotation-powered pulsar, the model of vibration-powered magnetar undergoing quake-induced torsional Alfvén vibrations in its own ultrastrong magnetic field experiencing decay is considered. The presented line of argument suggests that the gradual decrease of frequencies (lengthening of periods) of long-periodic-pulsed radiation detected from a set of X-ray sources can be attributed to magnetic-field-decay-induced energy conversion from seismic vibrations to magnetodipole radiation of quaking magnetar.

scholarly journals A New View on Young Pulsars in Supernova Remnants: Slow, Radio-quiet & X-ray Bright

2000 ◽  
Vol 177 ◽  
pp. 699-702 ◽  
Author(s):  
E. V. Gotthelf ◽  
G. Vasisht
Keyword(s):  
Magnetic Field ◽  
Neutron Stars ◽  
Supernova Remnants ◽  
Simple Explanation ◽  
Crab Pulsar ◽  
Radio Pulsars ◽  
Substantial Fraction ◽  
Subsequent Evolution ◽  
X Ray ◽  
Field Decay

AbstractWe propose a simple explanation for the apparent dearth of radio pulsars associated with young supernova remnants (SNRs). Recent X-ray observations of young remnants have revealed slowly rotating (P∼ 10s) central pulsars with pulsed emission above 2 keV, lacking in detectable radio emission. Some of these objects apparently have enormous magnetic fields, evolving in a manner distinct from the Crab pulsar. We argue that these X-ray pulsars can account for a substantial fraction of the long sought after neutron stars in SNRs and that Crab-like pulsars are perhaps the rarer, but more highly visible example of these stellar embers. Magnetic field decay likely accounts for their high X-ray luminosity, which cannot be explained as rotational energy loss, as for the Crab-like pulsars. We suggest that the natal magnetic field strength of these objects control their subsequent evolution. There are currently almost a dozen slow X-ray pulsars associated with young SNRs. Remarkably, these objects, taken together, represent at least half of the confirmed pulsars in supernova remnants. This being the case, these pulsars must be the progenitors of a vast population of previously unrecognized neutron stars.

scholarly journals Recent Ginga Results on Galactic X-Ray Binaries

1992 ◽  
Vol 9 ◽  
pp. 211-215
Author(s):  
Y. Tanaka
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Related Problem ◽  
X Ray ◽  
Field Decay ◽  
X Ray Binaries ◽  
The Magnetic Field ◽  
Black Hole Candidates

AbstractBased on the recent Ginga results, following topics on X-ray binaries are briefly discussed: The cyclotron resonnance features observed from several X-ray pulsars, and related problem of the magnetic field decay. Search for millisec. pulsations from LMXRBs. Very bright transients which are suspected to be new black hole candidates, and an estimation of the number of such black hole sources in our galaxy.

Evidence for Magnetic Field Decay in the Slowest Known Be/X-ray Pulsars X Per and RX J0146.9+5121

2000 ◽  
Vol 175 ◽  
pp. 723-726
Author(s):  
X.-D. Li ◽  
Z.-R. Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
X Ray ◽  
Field Decay

AbstractWe argue that the slowest known Be/X-ray pulsars X Per and RX J0146.9+5121 currently possess relatively weak (≲ 1012 G) magnetic fields. Unless these pulsars were born rotating very slowly (initial periods longer than tens of seconds), in order to explain their long spin periods (~ 835 and ~ 1412 s, respectively), they must have had magnetic fields stronger than a few 1013 G; that is, their magnetic fields must have decayed.

Period Clustering of the Anomalous X-Ray Pulsars and Magnetic Field Decay in Magnetars

2000 ◽  
Vol 529 (1) ◽  
pp. L29-L32 ◽  
Author(s):  
Monica Colpi ◽  
Ulrich Geppert ◽  
Dany Page
Keyword(s):  
Magnetic Field ◽  
X Ray ◽  
Field Decay

scholarly journals The surface and inner temperatures of magnetars

2012 ◽  
Vol 8 (S291) ◽  
pp. 386-388
Author(s):  
Z. F. Gao ◽  
N. Wang ◽  
Q. H. Peng
Keyword(s):  
Magnetic Field ◽  
Neutrino Emission ◽  
Effective Surface ◽  
X Ray ◽  
One To One ◽  
Field Decay ◽  
Neutrino Luminosity ◽  
The Magnetic Field

AbstractAssuming that the timescale of the magnetic field decay is approximately equal to that of the stellar cooling via neutrino emission, we obtain a one-to-one relationship between the effective surface thermal temperature and the inner temperature. The ratio of the effective neutrino luminosity to the effective X-ray luminosity decreases with decaying magnetic field.

scholarly journals The Origin of Millisecond Pulsars

1996 ◽  
Vol 160 ◽  
pp. 547-556 ◽  
Author(s):  
Dipankar Bhattacharya
Keyword(s):  
Standard Model ◽  
Millisecond Pulsar ◽  
Millisecond Pulsars ◽  
X Ray ◽  
Additional Argument ◽  
The Standard Model ◽  
Low Mass ◽  
Pulsar Populations ◽  
X Ray Binaries ◽  
Kinematic Properties

AbstractAccording to the standard model, millisecond pulsars are the descendants of low-mass X-ray binaries (LMXB). The importance of this formation route has, however, been questioned by several authors on different grounds. This paper critically reviews the arguments and assumptions underlying the standard model. The kinematic properties of the LMXB and millisecond pulsar populations are compared, and are found to be compatible. This provides an additional argument in favour of the standard model.

scholarly journals Understanding the coexistence of spin-up and spin-down behaviours in long-period X-ray pulsars

2020 ◽  
Vol 492 (1) ◽  
pp. 762-769
Author(s):  
W Wang ◽  
H Tong
Keyword(s):  
Magnetic Field ◽  
Binary Systems ◽  
Accretion Rate ◽  
Constant Mass ◽  
X Ray ◽  
Spin Period ◽  
Long Period ◽  
Rotational Evolution ◽  
Order Of Magnitude ◽  
Field Decay

ABSTRACT Assuming wind-fed accretion magnetars in long-period X-ray pulsars, we calculated the rotational evolution of neutron stars. Our calculations considered the effects of magnetic field decay in magnetars. The results show that wind-fed accretion magnetars can evolve to long-period X-ray pulsars with a spin period much longer than 1000 s. The spin-down trend observed in 4U 2206+54-like sources is expected when young X-ray binary systems are on the way to their equilibrium period. Detailed calculations showed that the spin-down may be affected by accretion with outflows or accretion while spinning down. Due to magnetic field decay in magnetars, wind-fed accretion magnetars will have a decreasing equilibrium period for a constant mass accretion rate. For 2S 0114+65, the spin-up rate due to magnetic field decay is one order of magnitude smaller than observations. The spin-up rate of 2S 0114+65 may be attributed to the formation of a transient disc during wind accretion. The slowest X-ray pulsar AX J1910.7+0917 would be a link source between 4U 2206+54 and 2S 0114+65.

scholarly journals THE STRONG MAGNETIC FIELD DECAY AND EVOLUTION OF RADIO PULSARS ON THE P–Ṗ DIAGRAM

2004 ◽  
Vol 13 (09) ◽  
pp. 1805-1815 ◽  
Author(s):  
OKTAY H. GUSEINOV ◽  
AŞKIN ANKAY ◽  
SEVINÇ O. TAGIEVA
Keyword(s):  
Magnetic Field ◽  
Observational Data ◽  
Strong Magnetic Field ◽  
Characteristic Time ◽  
Radio Pulsars ◽  
X Ray ◽  
The Real ◽  
Field Decay

In this work we have analysed various data on radio pulsars and we have shown that magnetic field decay of a factor about 10–20 is necessary to explain their evolution, in particular to remove the discrepancy between the characteristic and the real ages. The character of the field decay is exponential with a characteristic time of about 3×106 year. Observational data on single X-ray pulsars which radiate due to cooling also support this result.

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