A Relativistic F[CLC]e[/CLC] Kα Emission Line in the Intermediate-Luminosity [ITAL]B[CLC]eppo[/CLC]SAX[/ITAL] Spectrum of the Galactic Microquasar V4641 Sgr

Abstract

Broad Fe Ka emission lines have recently been reported in a number of Galactic black holes. Such lines are useful accretion flow diagnostics because they may be produced at the inner accretion disk and shaped by relativistic effects, but in general they have been observed only at luminosities of in 37 38 Ϫ1

Fluorescent iron lines as a probe of astrophysical black hole systems

“…Broadened iron lines have been detected with BeppoSAX observations of V4641 Sgr [291] and GRS 1915+105 [219]. Both of these sources have exhibited strong radio "jet ejection events" with apparent super-luminal motion and inferred velocities of 0.9 c [292,77].…”

A short review of relativistic iron lines from stellar‐mass black holes

“…It has also motivated both new observations and archival analysis with gas spectrometer data. Apart from the line in GRS 1915+105 and SAX J1711.6-3808 discussed above (Martocchia et al 2002;In 't Zand et al 2002), BeppoSAX also observed broad Fe K lines in Cygnus X-1 (Frontera), XTE J1908+094 (In 't Zand et al 2002b), and V4641 Sgr (Miller et al 2002c). An analysis of archival ASCA gas imaging spectrometer (GIS) data revealed detections of broad, relativistic lines in XTE J1550-564, GRO J1655-40, GRS 1915+105, and Cygnus X-1 .…”

Current Status of Simulations

“…GRO J1655-40 (Orosz and Bailyn 1997), V4641 Sgr (Miller et al 2002) and GX 339-4 (Miller et al 2009), and active galactic nuclei (AGN), e.g. NGC 3079 (Kondratko et al 2005), NGC 1068 (Caproni et al 2006), and NGC 4258 (Caproni et al 2007), may have accretion disks that are tilted with respect to the symmetry plane of their central black hole spacetimes.…”