1,660 research outputs found
Linking the X-ray timing and spectral properties of the glitching AXP 1RXS J170849-400910
Previous studies of the X-ray flux and spectral properties of 1RXS
J170849-400910 showed hints of a possible correlation with the spin glitches
that occurred in 1999 and 2001. However, due to the sparseness of spectral
measurements and the paucity of detected glitches no firm conclusion could be
drawn. We retrieved and analysed archival XTE pointings of 1RXS J170849-400910
covering the time interval between January 2003 and June 2006 and carried out a
detailed timing analysis by means of phase fitting techniques. We detected two
relatively large glitches Delta nu / nu of 1.2 and 2.1 10^-6 occurred in
January and June 2005. Interestingly, the occurrence times of these glitches
are in agreement with the predictions made in our previous studies. This
finding strongly suggests a connection between the flux, spectral and timing
properties of 1RXS J170849-400910.Comment: Submitted to A&A, 4 pages; results presented at the INT meeting "The
Neutron Star Crust and Surface: Observations and Models" on June 27; referee
comments adde
Assessing the vulnerability of buildings to tsunami in Sydney
Australia is vulnerable to the impacts of tsunamis and exposure along the SE coast of New South Wales is especially high. Significantly, this is the same area reported to have been affected by repeated large magnitude tsunamis during the Holocene. Efforts are under way to complete probabilistic risk assessments for the region but local government planners and emergency risk managers need information now about building vulnerability in order to develop appropriate risk management strategies. We use the newly revised PTVA-3 Model (Dall'Osso et al., 2009) to assess the relative vulnerability of buildings to damage from a "worst case tsunami" defined by our latest understanding of regional risk â something never before undertaken in Australia. We present selected results from an investigation of building vulnerability within the local government area of Manly â an iconic coastal area of Sydney. We show that a significant proportion of buildings (in particular, residential structures) are classified as having "High" and "Very High" Relative Vulnerability Index scores. Furthermore, other important buildings (e.g., schools, nursing homes and transport structures) are also vulnerable to damage. Our results have serious implications for immediate emergency risk management, longer-term land-use zoning and development, and building design and construction standards. Based on the work undertaken here, we recommend further detailed assessment of the vulnerability of coastal buildings in at risk areas, development of appropriate risk management strategies and a detailed program of community engagement to increase overall resilience
Corrigendum to "A revised (PTVA) model for assessing the vulnerability of buildings to tsunami damage" published in Nat. Hazards Earth Syst. Sci., 9, 1557â1565, 2009"
No abstract available
The 2008 October Swift detection of X-ray bursts/outburst from the transient SGR-like AXP 1E 1547.0-5408
We report on the detailed study of the 2008 October outburst from the
anomalous X-ray pulsar (AXP) 1E 1547.0-5408 discovered through the Swift/Burst
Alert Telescope (BAT) detection of SGR-like short X-ray bursts on 2008 October
3. The Swift/X-ray Telescope (XRT) started observing the source after less than
100 s since the BAT trigger, when the flux (about 6E-11 erg/cm^2/s in the 2-10
keV range) was >50 times higher than its quiescent level. Swift monitored the
outbursting activity of 1E 1547.0-5408 on a daily basis for approximately three
weeks. This strategy allowed us to find a phase-coherent solution for the
source pulsations after the burst, which, besides period and period derivative,
requires a positive Period second derivative term (spin-down increase). The
time evolution of the pulse shape is complex and variable, with the pulsed
fraction increasing from 20% to 50% within the Swift observational window. The
XRT spectra can be fitted well by means of a single component, either a
power-law (PL) or a blackbody (BB). During the very initial phases of the
outburst the spectrum is hard, with a PL photon index about 2 (or kT about 1.4
keV) which steepens to about 4 (or kT about 0.8 keV) within one day from the
BAT trigger, though the two components are likely present simultaneously during
the first day spectra. An INTEGRAL observation carried out five days after the
trigger provided an upper limit of about 2E-11 erg/cm^2/s to the emission of 1E
1547.0-5408 in the 18-60 keV band.Comment: 10 pages, 2 tables, 6 figures; accepted for publication in MNRA
Long term hard X-ray variability of the anomalous X-ray pulsar 1RXS J170849.0-400910 discovered with INTEGRAL
We report on a multi-band high-energy observing campaign aimed at studying
the long term spectral variability of the Anomalous X-ray Pulsar (AXP) 1RXS
J170849.0-400910, one of the magnetar candidates. We observed 1RXS
J170849.0-400910 in Fall 2006 and Spring 2007 simultaneously with Swift/XRT, in
the 0.1-10 keV energy range, and with INTEGRAL/IBIS, in the 20-200 keV energy
range. Furthermore, we also reanalyzed, using the latest calibration and
software, all the publicly available INTEGRAL data since 2002, and the soft
X-ray data starting from 1999 taken using BeppoSAX, Chandra, XMM, and
Swift/XRT, in order to study the soft and hard X-ray spectral variability of
1RXS J170849.0-400910. We find a long-term variability of the hard X-ray flux,
extending the hardness-intensity correlation proposed for this source over 2
orders of magnitude in energy.Comment: 5 pages, 2 figures, accepted for publication in Astronomy &
Astrophysics main journa
Constraining Radio Emission from Magnetars
We report on radio observations of five magnetars and two magnetar candidates
carried out at 1950 MHz with the Green Bank Telescope in 2006-2007. The data
from these observations were searched for periodic emission and bright single
pulses. Also, monitoring observations of magnetar 4U0142+61 following its 2006
X-ray bursts were obtained. No radio emission was detected was detected for any
of our targets. The non-detections allow us to place luminosity upper limits
(at 1950 MHz) of approximately L < 1.60 mJy kpc^2 for periodic emission and L <
7.6 Jy kpc^2 for single pulse emission. These are the most stringent limits yet
for the magnetars observed. The resulting luminosity upper limits together with
previous results are discussed, as is the importance of further radio
observations of radio-loud and radio-quiet magnetars.Comment: 11 pages, 4 figure
Discovery of Rapid X-ray Oscillations in the Tail of the SGR 1806-20 Hyperflare
We have discovered rapid Quasi Periodic Oscillations (QPOs) in RXTE/PCA
measurements of the pulsating tail of the 27th December 2004 giant flare of SGR
1806-20. QPOs at about 92.5Hz are detected in a 50s interval starting 170s
after the onset of the giant flare. These QPOs appear to be associated with
increased emission by a relatively hard unpulsed component and are seen only
over phases of the 7.56s spin period pulsations away from the main peak. QPOs
at about 18 and 30Hz are also detected, 200-300s after the onset of the giant
flare. This is the first time that QPOs are unambiguously detected in the flux
of a Soft Gamma-ray Repeater, or any other magnetar candidate. We interpret the
highest QPOs in terms of the coupling of toroidal seismic modes with Alfven
waves propagating along magnetospheric field lines. The lowest frequency QPO
might instead provide indirect evidence on the strength of the internal
magnetic field of the neutron star.Comment: Accepted for publication on ApJ Letters. 4 Pages, 3 figures.
emulateapj5 style use
X-ray and radio bursts from the magnetar 1E 1547.0-5408
We report on simultaneous radio and X-ray observations of the radio-emitting magnetar 1E 1547.0-5408 on 2009 January 25 and February 3, with the 64 m Parkes radio telescope and the Chandra and XMM-Newton X-ray observatories. The magnetar was observed in a period of intense X-ray bursting activity and enhanced X-ray emission. We report here on the detection of two radio bursts from 1E 1547.0-5408 reminiscent of fast radio bursts (FRBs). One of the radio bursts was anticipated by âŒ1 s (about half a rotation period of the pulsar) by a bright SGR-like X-ray burst, resulting in a F/F ⌠10. Radio pulsations were not detected during the observation showing the FRB-like radio bursts, while they were detected in the previous radio observation. We also found that the two radio bursts are neither aligned with the latter radio pulsations nor with the peak of the X-ray pulse profile (phase shift of âŒ0.2). Comparing the luminosity of these FRB-like bursts and those reported from SGR 1935 +2154, we find that the wide range in radio efficiency and/or luminosity of magnetar bursts in the Galaxy may bridge the gap between âordinaryâ pulsar radio bursts and the extragalactic FRB phenomenon.G.L.I. and L.S. acknowledge funding from ASI-INAF agreements I/037/12/0 and 2017-14-H.O. G.L.I. and A.T. acknowledge financial support from the Italian MIUR PRIN
grant 2017LJ39LM. M.B., A.P., and L.S. acknowledge funding from the grant âiPeskaâ (INAF PRIN-SKA/CTA; PI Possenti). N.R. is supported by the ERC Consolidator Grant âMAGNESIAâ (nr.817661), and by grants SGR2017-1383 and PGC2018-095512-BI00. We acknowledge the support of the PHAROS COST Action (CA16214)
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