Search Publications
Physical conditions in Photo-Dissociation Regions around Planetary Nebulae
Tielens, A. G. G. M.; Bernard-Salas, J.
We present observations of the infrared fine-structure lines of [Si II] (34.8 µm), [O I] (63.2 and 145.5 µm) and [C II] (157.7 µm) obtained with the ISO SWS and LWS spectrographs of nine Planetary Nebulae (PNe). These lines originate in the Photo-Dissociation Regions (PDRs) associated with the nebulae and provide useful informati…
Discovery of X-ray pulsations from IGR J16320-4751 = AX J1631.9-4752
Revnivtsev, M.; Rodriguez, J.; Lutovinov, A. +1 more
We report a discovery of strong modulations of the X-ray flux detected from IGR J16320-4751 = AX J1631.9-4752 with a period of P∼1300 s. We reanalyzed the data of an XMM-Newton ToO performed soon after the discovery of the source by INTEGRAL and found the modulation at a period of P=1309 ± 40 s with a high significance. Modulations of the source f…
The nature of the X-ray halo of the plerion G21.5-0.9 unveiled by XMM-Newton and Chandra
Bocchino, F.; Bandiera, R.; van der Swaluw, E. +1 more
The nature of the radio-quiet X-ray halo around the plerionic supernova remnant G21.5-0.9 is under debate. On the basis of spatial and spectral analysis of a large Chandra and XMM-Newton dataset of this source, we have developed a self-consistent scenario which explains all the observational features. We found that the halo is composed by diffuse …
A homogeneous set of globular cluster relative distances and reddenings
Salaris, M.; Recio-Blanco, A.; Zoccali, M. +6 more
We present distance modulus and reddening determinations for 72 Galactic globular clusters from the homogeneous photometric database of Piotto et al. ([CITE]), calibrated to the HST flight F439W and F555W bands. The distances have been determined by comparison with theoretical absolute magnitudes of the ZAHB. For low and intermediate metallicity c…
Photon dominated regions in the spiral arms of M 83 and M 51
Gerin, M.; Stutzki, J.; Kramer, C. +5 more
We present [C I] 3P1-3P0 spectra at four spiral arm positions and the nuclei of the nearby galaxies M 83 and M 51 obtained at the JCMT. The spiral arm positions lie at galacto-centric distances of between 2 kpc and 6 kpc. This data is complemented with maps of CO 1-0, 2-1, and 3-2, and ISO/LWS far-infrared data of [C II] (158…
HST/STIS low dispersion spectroscopy of three Compact Steep Spectrum sources. Evidence for jet-cloud interaction
Capetti, A.; Koekemoer, A. M.; Morganti, R. +9 more
We present Hubble Space Telescope Imaging Spectrograph long-slit spectroscopy of the emission line nebulae in the compact steep spectrum radio sources
XMM-Newton observations of the supernova remnant RX J0852.0-4622/GRO J0852-4642
Haberl, F.; Aschenbach, B.; Dennerl, K. +2 more
RX J0852.0-4622 is a supernova remnant discovered in the ROSAT all-sky survey. Spatially coincident 1.157 MeV γ-ray line emission was detected with the COMPTEL instrument on-board CGRO. The analysis combining the X-ray and γ-ray data suggests that RX J0852.0-4622 is a close-by and young supernova remnant. Follow-up observations with ASCA show that…
XMM-Newton observations of the heavily absorbed Seyfert 1 galaxy IC 4329A
Kaastra, J. S.; Behar, E.; Sako, M. +5 more
We detect seven distinct absorbing systems in the high-resolution X-ray spectrum of the Seyfert 1 galaxy IC 4329A, taken with XMM-Newton. Firstly we detect absorption due to cold gas in our own Galaxy and warm gas in the Galactic halo or the Local Group. This local warm gas is only detected through O VII absorption, from which we deduce a temperat…
XMM-Newton study of the lensing cluster of galaxies CL 0024+17
Zhang, Y. -Y.; Böhringer, H.; Forman, W. +2 more
We present a detailed gravitational mass measurement based on the XMM-Newton imaging spectroscopy analysis of the lensing cluster of galaxies CL 0024+17 at z=0.395. The emission appears approximately symmetric. However, on the scale of r ∼ 3.3' some indication of elongation is visible in the northwest-southeast (NW-SE) direction from th…
Spectral properties of nonthermal X-ray emission from the shell-type SNR RX J1713.7 3946 as revealed by XMM-Newton
Hiraga, J. S.; Takahashi, T.; Uchiyama, Y. +1 more
We present the results of our morphological and spectral study of the properties of the supernova remnant RX J1713.7-3946 based on data obtained with XMM-Newton. Highly inhomogeneous structures, such as the bright spots, filaments, and dark voids noted by Uchiyama et al. ([CITE]), appear in the entire bright western portion of the shell. In additi…