Possible Connection between ULXs and SXTs. Chang-Hwan Lee Seoul National University. 2002.11.29 KIAS. Why do we consider Accretion in NS/BH ? Eddington Luminosity & Mass Accretion Rate Ultraluminous X-ray Sources (ULXs) ULXs from Soft X-ray Transients Conclusion.
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ULXs and SXTs
Seoul National University
LEdd = 1.3 x 1038 (M/Msun) erg/s
L = f GMdM/R
If f=1 & L=LEdd dM = dMEdd
LEdd = 1.3 x 1038 (M/Msun) ergs/s
Q) How to evolve ?
Current 1915+105 (108 Rsun)
ApJ 575 (2002) 996
V4641 & 1915
Data: 33.5 days
Consistent within error range
14 Msun + 2 Msun
9.5 Msun + 6.5 Msun
Beauty of Simple Physical Laws !
Accretion Rate from V4641 Sgr to 1915+105
Coservative Mass Transfer
=> 100 Eddington Mass Accretion Rate
LLimit = N LEdd
N = O(10) : Porous Disk [white dwarf]
=> 10 Msun BH can explain the ULXs !
LLimit = f GMdM/R
f = O(0.1) : Photon Trapping
dM =100 dMEdd
10 Msun BH can have 10 LEdd & 100 dMEdd
LLimit = 10 LEdd= 13 x 1038 (M/Msun) ergs/s
ULXs (0 degree)
L > 10 LEdd
L = LEdd
10 Msun BH + 6 Msun Companion