Open AccessA Comptonization Model for Phase-Lag Variability in GRS 1915+105
Author(s) -
L. Nobili,
R. Turolla,
L. Zampieri,
T. Belloni
Publication year - 2000
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/312810
Subject(s) - physics , phase lag , lag , radius , thermal , stratification (seeds) , plateau (mathematics) , corona (planetary geology) , phase (matter) , astrophysics , time lag , accretion (finance) , computational physics , meteorology , seed dormancy , computer network , mathematical analysis , germination , computer security , mathematics , botany , quantum mechanics , dormancy , astrobiology , computer science , venus , biology
In this Letter we propose a simple thermal comptonization model to accountfor the observed properties of the phase lags associated to the ``plateau''intervals of GRS 1915+105. By invoking a temperature stratification in a coronaand assuming that the optical depth of the comptonizing region increases as thedisk inner radius moves inward, we are able to reproduce both the observedcolors and time lags in the continuum.Comment: 6 pages Latex with 2 ps figures. Accepted for publication in ApJ Letter
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