1 what are the brightest x-ray point sources in galaxies?
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What are the What are the Brightest X-ray Point Brightest X-ray Point Sources in Galaxies?Sources in Galaxies?
What are the What are the Brightest X-ray Point Brightest X-ray Point Sources in Galaxies?Sources in Galaxies?
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For reviews see astro-ph/0307077
Brightest: Lx(2-10keV) >10^38 ergs s^-1Non-nuclearStellar mass BHs and NSs LMXBs <3M_sun, transient/persistent HMXBs >3M_sun BH fallback disk (Li, 2003 astro -
ph/0309321) Young pulsars rotation-powered
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Milky Way
RXTE All-Sky MonitorH. J. Grimm, M. Gilfanov, and R. Sunyaev, 2002 (0109239)
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HMXBs
LMXBs a cutoff at 2.7*10^38 ergs s^-1
The integrated luminosity (2-10keV) is 2-3*10^39 erg s^-1, to which LMXBs contribute 90%. 55 high mass and 135 low mass binaries brighter than 2*10^35 erg s^-1.
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HMXBsGrimm et al. 2002 0205371
SFR/M_dyn>0.05M_sun*yr^-1 per 10^10M_sun
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A cutoff at Lc=2*10^40 erg s^-1
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LMXBs
Gilfanov 2003, 0309454
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Brighter than 10^38 erg s^-1
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Mass of BHs-- a revision to Hurley’s code
…… mtt=mt mt = min(1.3d0 + 0.29d0*mc,mt) if(mt.le.mxns) then kw = 13 else mt= min(-33.0d0+6.0d0*mc,mtt)
if(nobhkick) then if((mtt-mt).lt.1.0d-6) isnokick=.true. endif
kw = 14 ……
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For comparison see Belczynski et al. astro-ph/0404068 and ApJ, 2002, 572, 407
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BH fallback disk model
Mineshige et al. 1997, ApJ 489, 227
Li 2003
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Ohsuga et al. 2002 0203425
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Disk lifetime (Menou 2001, ApJ, 559, 1032):
yrTM
tMtRt p
p
c
p
sun
p
p
p
p
n 10
)(106.6)( 71
7
6,
71
1
3071
3512
142
67
08
yrTM
tMtRt p
p
c
p
sun
p
p
p
p
irrn
10
)(106.6)( 51
5
6,
51
1
3051
2511
102
45
08
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Possenti et al. 2002Possenti et al. 2002
Young pulsars
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Initial Mass Fuction (IMF):
Star Formation Rate (SFR) for MW: 0.25M_sun/yr (>5M_sun) Grimm et al. 2002 = 4M_sun/yr (through the mass range) McKee & Williams 1997, 476, 144
18yita_bol = 0.05
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谢谢！