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Titolo:
Spectral differences between the radio-loud and radio-quiet low-hard states of GRS 1915+105: Possible detection of synchrotron radiation in X-rays
Autore:
Vadawale, SV; Rao, AR; Chakrabarti, SK;
Indirizzi:
Tata Inst Fundamental Res, Mumbai 400005, India Tata Inst Fundamental ResMumbai India 400005 Res, Mumbai 400005, India SN Bose Natl Ctr Basic Sci, Calcutta 700091, W Bengal, India SN Bose Natl Ctr Basic Sci Calcutta W Bengal India 700091 W Bengal, India
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 372, anno: 2001,
pagine: 793 - 802
SICI:
1432-0746(200106)372:3<793:SDBTRA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOURCE GRS-1915+105; RELATIVISTIC JETS; RXTE OBSERVATIONS; COMPACT OBJECTS; MASS OUTFLOW; BLACK-HOLES; TRANSITIONS; CONNECTION; GALAXY; ORIGIN;
Keywords:
accretion; accretion disks; black hole physics; stars : winds; outflows; stars : individual : GRS1915+105; X-rays : stars;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Vadawale, SV Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, India Tata Inst Fundamental Res Homi Bhabha Rd Mumbai India 400005
Citazione:
S.V. Vadawale et al., "Spectral differences between the radio-loud and radio-quiet low-hard states of GRS 1915+105: Possible detection of synchrotron radiation in X-rays", ASTRON ASTR, 372(3), 2001, pp. 793-802

Abstract

The Galactic microquasar GRS 1915+105 exhibits several episodes of steady X-ray emission characterized by a hard power-law spectrum and intense QuasiPeriodic Oscillations. It is known that there are two types of such low-hard states, one with steady radio emission and the other without any significant radio emission. We present the results of a detailed X-ray spectroscopic study of GRS 1915+105, using data from the Rossi X-ray Timing Explorer obtained during various episodes of the low-hard states of the source. We show that there are distinct X-ray spectral differences between the radio-quiet and radio-loud low-hard states of the source. The X-ray spectra of the radio-quiet low-hard state is best described by a model consisting of a multicolor disk-blackbody and a Comptonized component, whereas the X-ray spectra of radio-loud low-hard state requires a model consisting of three components: a multicolor disk-blackbody, a Comptonized component and a power-law, for statistically and physically acceptable fits. We attempt to model the presence of this additional power-law component as due to synchrotron radiation which is responsible for the radio and infrared radiation from the source. We show that a simple adiabatically expanding jet model for the synchrotron radiation can account for the observed X-ray flux for reasonable values of the magnetic field and the mass out ow rate. This is the first report of detection of the synchrotron radiation in the X-ray band for this source.

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Documento generato il 05/04/20 alle ore 00:24:15