Time lag in transient cosmic accreting sources

被引：4

作者：

Bisnovatyi-Kogan, G. S. ^{[1
,2
,3
]}

Giovannelli, F. ^{[4
]}

机构：

[1] Sapienza Univ Rome, Dept Phys, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[2] Natl Res Nucl Univ, MEPhI Moscow Engn Phys Inst, Kashirskoe Shosse 31, Moscow 115409, Russia

[3] Russian Acad Sci, Space Res Inst, Profsoyuznaya 84-32, Moscow 117997, Russia

[4] INAF, Ist Astrofis & Planetol Spaziali, Via Fosso del Cavaliere 100, I-00133 Rome, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 599卷

基金：

俄罗斯基础研究基金会;

关键词：

accretion; accretion disks; galaxies: nuclei; ACTIVE GALACTIC NUCLEI; MASSIVE BLACK-HOLE; X-RAY VARIABILITY; TIDAL INTERACTION; CONTINUUM EMISSION; SPACE TELESCOPE; GRO J1655-40; DWARF NOVAE; UV DELAY; NGC; 5548;

D O I：

10.1051/0004-6361/201628810

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. We develop models for time lag between the maxima of the source brightness in different wavelengths during a transient flash of luminosity that is connected with a short-period increase of the mass flux onto the central compact object. Aims. We derive a simple formula for finding the time delay among events in different wavelengths which is valid in general for all disk-accreting cosmic sources. We quantitatively also discuss a model for time-lag formation in active galactic nuclei (AGNs). Methods. In close binaries with accretion disks, the time lag is connected with effects of viscosity that define a radial motion of matter in the accretion disk. In AGN flashes, the infalling matter has a low angular momentum, and the time lag is defined by the free-fall time to the gravitating center. Results. We show the validity of these models by means of several examples of galactic and extragalactic accreting sources.

引用

页数：7

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