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600 papers · 1 filter
An Accelerating Cosmology Without Dark Energy
G. Steigman, R. C. Santos, J. A. S. Lima
The negative pressure accompanying gravitationally-induced particle creation can lead to a cold dark matter (CDM) dominated, accelerating Universe (Lima et al. 1996) without requir…
Local Star formation triggered by SN shocks in magnetized diffuse neutral clouds
M. R. M. Leao, E. M. de Gouveia Dal Pino, D. Falceta-Goncalves +2
In this work, considering the impact of a SNR with a neutral magnetized cloud we derived analytically a set of conditions which are favorable for driving gravitational instability…
Abundances in the Galactic bulge: results from planetary nebulae and giant stars
C. Chiappini, S. Gorny, G. Stasinska +1
Our understanding of the chemical evolution of the Galactic bulge requires the determination of abundances in large samples of giant stars and planetary nebulae (PNe). We discuss P…
The isolated neutron star candidate 2XMM J104608.7-594306
A. M. Pires, C. Motch, R. Turolla +2
Over the last decade, X-ray observations unveiled the existence of several classes of isolated neutron stars (INSs) which are radio-quiet or exhibit radio emission with properties…
CMBPol Mission Concept Study: Foreground Science Knowledge and Prospects
A. A. Fraisse, J. -A. C. Brown, G. Dobler +10
We report on our knowledge of Galactic foregrounds, as well as on how a CMB satellite mission aiming at detecting a primordial B-mode signal (CMBPol) will contribute to improving i…
Hαspectropolarimetry of RY Tau and PX Vul
A. Pereyra, A. M. Magalhães, F. X. de Araújo
Aims: To detect line effects using spectropolarimetry in order to find evidence of rotating disks and their respective symmetry axes in T Tauri stars. Methods: We used the IAGPOL i…