Observational evidence for mass ejection during soft X-ray dips in GRS 1915+105

Citation
Sv. Vadawale et al., Observational evidence for mass ejection during soft X-ray dips in GRS 1915+105, ASTRON ASTR, 370(1), 2001, pp. L17-L21
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
370
Issue
1
Year of publication
2001
Pages
L17 - L21
Database
ISI
SICI code
0004-6361(200104)370:1<L17:OEFMED>2.0.ZU;2-V
Abstract
We investigate the connection between tile X-ray and radio properties of th e Galactic microquasar GRS 1915+105, by analyzing the X-ray data observed w ith RXTE, during tile presence of a huge radio flare (similar to 450 mJy). The X-ray lightcurve shows two dips of similar to 100 s duration. Detailed time resolved spectral analysis shows the existence of three spectral compo nents: a multicolor disk-blackbody a Comptonized component, due to hot plas ma and a power-law. We find that the Comptonized component is very weak dur ing the dip. This is further confirmed by the PHA ratio of the raw data and ratio of tile lightcurves in different energy bands. These results, combin ed with the fact that the 0.5-10 Hz QPO disappears during tile dip and that the Comptonized component is responsible for the QPO lead to the conclusio n l;l-lat during the dips the matter emitting; Comptonized spectrum is ejec ted away. This establishes a direct connection between the X-ray and radio properties of tile source.