ar X iv : a st ro - p h / 06 09 20 0 v 1 7 S ep 2 00 6 Constraints on RRAT Emission Mechanisms from RXTE / PCA Observations of RRAT J 1819 − 1458
نویسنده
چکیده
We derive the second and most stringent limit to date of the X-ray/radio flux ratio (FX/F1.4GHz) for the radio bursts associated with the recently identified source class, the Rotating Radio Transients (RRATs). We analyze 20.1 hr of RXTE/PCA observations of RRAT J1819−1458 – a period during which 350±23 RRAT radio bursts occurred, based on the previously observed average radio burst rate. No X-ray bursts were detected, implying an upperlimit on the X-ray flux for RRAT-bursts of FX,lim <1.5×10 −8 erg cm s (2-10 keV), or a luminosity < 2.3×10(d/3.6 kpc) erg s. The time-average burst flux is <2×10 erg cm s (0.5-8 keV) – a factor of 10 below that of the previously identified persistent X-ray counterpart. Thus, X-ray bursts from the RRAT are energetically unimportant compared with the persistent X-ray emission. From the previously observed burst radio flux, we derive an upperlimit FX/F1.4GHz ≤ 4.2×10 −12 erg cm smJy for the radio bursts from this RRAT, the most stringent to date, due to the high radio flux of bursts from this source. The FX/F1.4GHz ratio is a factor ∼80 larger than that of the millisecond pulsar PSR B1821-24; thus emission processes of X-ray/radio efficiency comparable to MSP pulses cannot be ruled out. However, if the RRAT burst emission mechanism is identical to the ms bursts of magnetars, then the ms bursts of magnetars should be easily detected with radio instrumentation; yet none have been reported to date. Subject headings: stars: flare; stars: neutron; X-rays: stars; pulsars: individual (J1819−1458)
منابع مشابه
Upper Limits on X-ray Emission from Two Rotating Radio Transients
X-ray emission from the enigmatic Rotating RAdio Transients (RRATs) offers a vital clue to understanding these objects and how they relate to the greater neutron star population. An X-ray counterpart to RRAT J1819−1458 is known, and its properties are similar to those of other middle-aged (0.1Myr) neutron stars. We have searched for X-ray emission with Chandra/ACIS at the positions of two RRATs...
متن کاملar X iv : a st ro - p h / 06 09 71 4 v 1 26 S ep 2 00 6 3 D Position Sensitive XeTPC for Dark Matter Search
X iv :a st ro -p h/ 06 09 71 4 v1 26 S ep 2 00 6 3D Position Sensitive XeTPC for Dark Matter Search J. Angle, E. Aprile, F. Arneodo, L. Baudis, A. Bernstein, A. Bolozdynya, L. Coelho, E. Dahl , L. DeViveiros, A. Ferella, L. Fernandes, S. Fiorucci, R.J. Gaitskell, K.-L. Giboni, R. Gomez, R. Hasty, J. Kwong, J.A.M. Lopes, N. Madden, A. Manalaysay, A. Manzur, D. McKinsey, M.E. Monzani, K. Ni ∗, U....
متن کاملar X iv : h ep - p h / 06 09 07 7 v 1 7 S ep 2 00 6 Hadron multiplicities in e + e − annihilation with heavy primary quarks
متن کامل
ar X iv : a st ro - p h / 06 12 53 0 v 1 1 9 D ec 2 00 6 High sensitivity low frequency radio observations of cD galaxies
We present the GMRT 235 MHz images of three radio galaxies and 610 MHz images of two sources belonging to a complete sample of cD galaxies in rich and poor galaxy clusters. The analysis of the spectral properties confirms the presence of aged radio emission in two of the presented sources.
متن کاملDiscovery of the X - Ray Counterpart to the Rotating Radio Transient
We present the discovery of the first X-ray counterpart to a Rotating RAdio Transient (RRAT) source. RRAT J1819–1458 is a relatively highly magnetized (B ∼ 5 × 1013 G) member of a new class of unusual pulsar-like objects discovered by their bursting activity at radio wavelengths. The position of RRAT J1819– 1458 was serendipitously observed by the Chandra ACIS-I camera in 2005 May. At that posi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008