1. XMM-Newton Observation of the composite SNR G0. 9+0
XMM-Newton Observation of the composite SNR G and the discovery of a new transient source
Lara Sidoli (IASF Milano)
Fabrizio Bocchino (Oss. Palermo)
Sandro Mereghetti (IASF Milano)
Rino Bandiera (Oss. Arcetri)

2. Overview Preliminary XMM results on the SNR G0.9+0.1
X-ray emission from the Pulsar Wind Nebula
X-ray emission from the radio shell ?
Discovery of a new X-ray Transient in the Galactic Center region

3. The Composite SNS G0.9+0.1: radio vs X-rays
Radio polarized core (2'diameter) and a radio shell (8' diameter)
Galactic Center region: the high absorption hampered the discovery at soft X-rays
BeppoSAX discovery of X-rays from the PWN (Mereghetti, Sidoli, Israel 1998)

4. XMM-Newton Observation

5. XMM-Newton vs Chandra
Expanded view of the central part of the XMM-Newton PN image (2-10 keV)
Comparison with the different substructures resolved with Chandra inside the PWN

6. Radial profile
Comparison of the G radial profile with the LMC X-3 profile taken as reference for the PSF
keV
keV
keV

7. Spectral Analysis: the entire PWN
We extracted PN and both MOS counts from within 1' from the PWN peak and corrected with a local background

8. PWN spectral results

9. Spectral Softening at larger distance
Analysis of 3 spectra extracted from 3 annular regions centered on the PWN shows a spectral softening
Powerlaw fits performed fixing the column density at the entire PWN spectrum best fit

10. Preliminary results on the X-ray emission from the radio shell
Net rate from the radio shell region / counts/s (3-6 keV)

11. X-rays from the shell region

12. Discovery of a NEW TRANSIENT Source in the Galactic Center region
A new X-ray source at R.A.=17h 47m 16.0s Dec= -28deg 10' 45''
Comparison between a GC survey observation performed on Sept.23, 2000 (Porquet et al. 2003) and our observation performed on March 12, 2003

13. Spectral Analysis of the New Transient

14. It's likely a transient LMXB located in the GC region
Powerlaw model fit to the X-ray Transient Spectrum:
Absorption Column Density ~ 8 E22 cm-2
Photon Index = 2.1 +/- 0.1
Unabs. Flux = 6.8 E-12 erg/cm2/s
Luminosity (2-10 keV) ~ 7 E34 erg/s 10 kpc)
It's likely a transient LMXB located in the GC region

15. Conclusions Preliminary results on the Composite SNR G0.9+0.1:
Entire PWN spectrum well fit with a power law with typical parameters of other PWNs
No hardness variations inside the nebula, with respect to XMM observation
Spectral Softening of the X-ray emission in the PWN with increasing distance from its brightness peak
Possible detection of X-rays from the radio shell (confirming Porquet et al discovery), maybe of non- thermal origin

16. Conclusions 2 Discovery of a New X-ray Transient source
High absorption
Spectrum well fit with a single powerlaw
Change in the observed flux of at least a factor of 80 between 2000 and 2003 XMM-Newton observation
It is likely a transient LMXB in the GC region