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2 results on '"Litterio M"'

1. Time and spectral changes of GRS 1915+105 in the ρ class.

Author

Ventura, G., Massaro, E., Mineo, T., Cusumano, G., Litterio, M., Feroci, M., Casella, P., and Matt, G.

Subjects
EMISSION-line galaxies, GALAXIES, ASTRONOMY, SPECTRUM analysis, PHYSICS, ASTROPHYSICS
Abstract

We report the results of the temporal and spectral analysis of the longest BeppoSAX pointing (about 770 ks) of the microquasar GRS 1915+105, performed in October 2000. The source was mainly observed in the variability class ρ characterized by series of sharp pulses with a typical recurrence time of about 50 s. This behaviour was generally stable but, occasionally, it changed to a more irregular state. A spectral analysis of the 1–100 keV emission showed a small but significant change of the disk temperature between the regular and irregular ρ-mode. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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2. The irregular ρ-mode of GRS 1915+105 observed with BeppoSAX

Author

Massaro, E., Litterio, M., Cusumano, G., Mineo, T., Casella, P., and Feroci, M.

Subjects
*SPECTRUM analysis, *FORCE & energy, *FRACTIONS, *QUASARS
Abstract

We report the results of the temporal and spectral analysis of the longest BeppoSAX pointing (about 770 ks) of the microquasar GRS 1915+105, performed in October 2000. For the largest fraction of the observation GRS 1915+105 was in the so called ρ-mode, characterized by series of sharp pulses with a typical recurrence time of about 50 s, well detectable in the energy range 2-10 keV. This quasi-periodic behaviour was generally quite stable but, occasionally, it changed to a more irregular state in which the pulses are broader and their recurrence time is highly fluctuating. We found that this irregular ρ-mode is associated with an enhanced emission at energies greater than 15 keV. Wavelet analysis of the (2–10 keV) light curves is used to study the time evolution of the ρ-mode. [Copyright &y& Elsevier]

Published
2004
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