Astrophys. J., 695, 431-441 (2009/April-2)
Nonthermal X-rays from supernova remnant G330.2+1.0 and the characteristics of its central compact object.
PARK S., KARGALTSEV O., PAVLOV G.G., MORI K., SLANE P.O., HUGHES J.P., BURROWS D.N. and GARMIRE G.P.
Abstract (from CDS):
We present results from our X-ray data analysis of the supernova remnant (SNR) G330.2+1.0 and its central compact object (CCO), CXOU J160103.1-513353 (J1601 hereafter). Using our XMM-Newton and Chandra observations, we find that the X-ray spectrum of J1601 can be described by neutron star atmosphere models (T ∞ ∼ 2.5-5.5 MK). Assuming the distance of d ∼ 5 kpc for J1601 as estimated for SNR G330.2+1.0, a small emission region of R ∼ 0.4-2 km is implied. X-ray pulsations previously suggested by Chandra are not confirmed by the XMM-Newton data, and are likely not real. However, our timing analysis of the XMM-Newton data is limited by poor photon statistics, and thus pulsations with a relatively low amplitude (i.e., an intrinsic pulsed fraction less than 40%) cannot be ruled out. Our results indicate that J1601 is a CCO similar to that in the Cassiopeia A SNR. X-ray emission from SNR G330.2+1.0 is dominated by power-law continuum (Γ ∼ 2.1-2.5) which primarily originates from thin filaments along the boundary shell. This X-ray spectrum implies synchrotron radiation from shock-accelerated electrons with an exponential roll-off frequency νrolloff∼ 2-3x1017 Hz. For the measured widths of the X-ray filaments (D ∼ 0.3 pc) and the estimated shock velocity (vs∼ a fewx103 km/s), a downstream magnetic field B ∼ 10-50 µG is derived. The estimated maximum electron energy Emax∼ 27-38 TeV suggests that G330.2+1.0 is a candidate TeV γ-ray source. We detect faint thermal X-ray emission in G330.2+1.0. We estimate a low preshock density n0∼ 0.1/cm3, which suggests a dominant contribution from an inverse Compton mechanism (than the proton-proton collision) to the prospective γ-ray emission. Follow-up deep radio, X-ray, and γ-ray observations will be essential to reveal the details of the shock parameters and the nature of particle accelerations in this SNR.
ISM: individual: SNR G330.2+1.0 - stars: neutron - supernova remnants - X-rays: stars
View the reference in ADS
To bookmark this query, right click on this link: simbad:2009ApJ...695..431P and select 'bookmark this link' or equivalent in the popup menu