XMM-Newton Observation of the composite SNR G0. 9+0 XMM-Newton Observation of the composite SNR G0.9+0.1 and the discovery of a new transient source Lara Sidoli (IASF Milano) Fabrizio Bocchino (Oss. Palermo) Sandro Mereghetti (IASF Milano) Rino Bandiera (Oss. Arcetri)

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

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)

XMM-Newton Observation

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

Radial profile Comparison of the G0.9+0.1 radial profile with the LMC X-3 profile taken as reference for the PSF --- 2-5 keV --- 2-10 keV --- 5-10 keV

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

PWN spectral results

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

Preliminary results on the X-ray emission from the radio shell Net rate from the radio shell region 0.0097 +/- 0.0011 counts/s (3-6 keV)

X-rays from the shell region

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

Spectral Analysis of the New Transient

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

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 2000 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. 2003 discovery), maybe of non- thermal origin

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