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2 First Objects III
3 Introduction Big bang nucleosynthesis Recombination Primordial chemistry Chemical reaction network (First Objects) 2 4. Cooling diagram Time scale H 2 abundance H 2 dissociation formation Cooling H 2 abundance Free-fall time cooling time Primordial chemistry... 9
4 7.2 First objects APPENDIX 28 A 28 B 32 C H H + 2 H 2 32 D Fastest time scale 33
5 3 Abstract A < 8... H 2 HD first objects. first objects. (λ) scale factor λ λ first objects. H 2 HD LiD 85 z=0000. first objects free fall cooling time scale. λ first objects.
6 4. Introduction Big bang.. I a (Vishwakarma 2000). baryon dark matter K (CMB). Big bang 00 He D Li H D He Li CMB. (Lepp & Shull 984 Puy & Signore 997 Stancil et al. 998 Galli & Pall 998). H 2 Saslow & Zipoy (976) Peelbes & Dicke (968). H 2 abundance H + 2 H H 2 first objects ( ) progenitor cooling. cooling first objects. First objects progenitor free-fall H 2 cooling (Palla et al.983 Mac Low & Shull 986 Lahav 986 Puy & Signore 996 ). Tegmark et al. (997) cold dark matter model (CDM) first objects CDM z M. Abel et al. (997) H 2 cooling M. Nishi et al. (998) Tegmark time scale H 2 abundance CDM
7 5 0 7 M. first objects 5000m 64 ALMA (Atacama Large Millimeter/submillimeter Array) (Nakai 2002).. first objects Λ=Λ +Λ 2 a m ( Özer 999 Vishwakarma 2000 Kimura et al. 200) Λ first objects.
8 Robertson-Walker Einstein d da [(ρ + ȧ 2 = 8πG 3 ρa2 + Λ 3 a2 k () Λ 8πG )a3 ]= 3(p Λ 8πG )a2 (2). H =ȧ/a (ȧ = da/dt) ρ p k. c = scale factor a 0 =( 0 ). () (2). () Λ (ρ v = p v =Λ/(8πG)). () (2) Ω. Ω λ Ω 0 λ 0 k. (3) (4) z. ȧ 2 = H0(Ωa λa 2 + Ω 0 λ 0 ) (3) d da [(Ω + λ)a3 ]= 3( p λ)a 2 ρ crit (4) Ω ρ λ Λ ρ crit H0 2 ρ crit 3H 0 2 8πG (5) k = H 2 0(Ω 0 + λ 0 ) (6) dz dt = H 0( + z) Ω+λ +( Ω 0 λ 0 )( + z) 2 (7) d dz [(Ω + λ)( +z )3 ]=3( p λ)( ρ crit +z )4 (8) 2.2. Ω=Ω γ +Ω ν +Ω e ± +Ω M (9). Ω γ Ω ν Ω e ± Ω M. Ω M a 3. Ω M cold dark matter baryonic matter.
9 K. Ω=Ω γ +Ω ν +Ω M (0). ρ r = ρ γ + ρ ν = a r T 4 γ N νa r T 4 ν () a r T γ T ν ( ) T ν0 4 /3 = (2) T γ0. ( ( ) ) 4 4/3 7 ρ r = + 8 N ν a r Tγ 4 (3) N ν () (3) (0) ( ( ) ) 4 4/3 7 Ω= + 8 N ar ν Tγ 4 +Ω M0 ( + z) 3 (4) ρ crit Ω M0 scale factor (Wage 993 Özer 999). (4) T γ λ = λ 0 + λ 20 a m (5) T γ = ρ crit ( ) ) 4/3 (Ω Ω M0 ( + z) a r (+ 3) 4 78 N ν 4 (6). p = 3 [ + ( ) 4 ] N ν a r Tγ 4 (7)
10 8 (8) (5) (7) dω dz = (6). 4Ω +z ( + z)2 Ω M0 mλ 0 ( + z) m (8) Kimura et al. (200) λ. λ 20 m 0.00 (9) λ 20 = m =.5 (Kimura et al. 200) m=.5 λ 0 = T(K) 00 0 λ 20 = λ 20 = z Fig..
11 Big bang nucleosynthesis Big bang. 0 0 K.. decoupling K. 0 9 K 00 D He Li Recombination Big bang. (T 0 4 K) (recombination). recombination. Helium recombination He. He recombination 2. z He 2+ He + He 2+ +e He + + hν (20) z 2700 He + He He + +e He + hν (2) Hydrogen recombination H (3.6 ev) T < 3.6 ev ( 0 5 K). H recombination H + +e H+hν (22)
12 0 H recombination.. H recombination Peebles et al. (968) (Matsuda et al. 97 Jones & Wyse 985 Sasaki & Takahara 993). Recombination 2 continuum 3. Continuum nc 2S Rc2 R2c 2P n2 S Π Ly α n Ground Fig. 2. Continuum n e (Jones & Wyse 985) dn e dt +K( n + R c2 n e n p ) = R c2 n e n p +K( n + n R 2c + R c2 n e n p ) R 2c n c e hν α k T +K n B +K[( +R 2c )n + R c2 n e n p ] (23) n p n n 2 n c ν α Lyman α ( Hz) 2S (8.227 s ) R c2 continuum R 2c continuum K time scale ( c3 ȧ 3πνα 3 a ) k B Lithium recombination Li recombination He Li (6.9 ev) recombination Li Li 3+ +e Li 2+ + hν (24) Li 2+ +e Li + + hν (25) Li + +e Li + hν (26)
13 3.3. Primordial chemistry Recombination (z 000). CMB H 2 HD first objects. H 2 chemistry H 2 H H H. a)h H+e H + hν (27) H +H H 2 +e (28) b)h + 2 H + +H H hν (29) H + 2 +H H 2 +H + (30) (z > 500) H 2 CMB. H + hν H+e (3) H hν H+ + H (32) HD chemistry HD H + +D D + + H (33) D + +H 2 H + + HD (34) HD dipole moment H+D HD + hν (35).
14 Chemical reaction network e H H + H D D + He He + He 2+ Li Li + Li H 2 H + 2 HD HD+ HeH + LiH LiH + H + 3 H 2D + 2. z. 85 (Galli & Palla 998) Big bang.. 2 dy i dt = j k j (T γ )y j + n l k lm (T m )y l y m (36) m y i i abundance ( n i n N y i = n i /n N ) k j k lm l m n N T γ T m t z (7) dz dt = H 0( + z) Ω 0 ( + z) 3 + λ (37). H 0 =00h km s Mpc. n N n N (z) =Ω b n cr ( + z) 3 (38). n cr = h 2 cm 3 Ω b = ρ b /ρ cr. (Peebles 968) dt m dt ȧ = 2T m a + 8σ T a r Tγ 4 y e (T γ T m ) (39) 3m e c σ T a r m e c y e y e = n e /n N CMB Compton.
15 3 (39) (3). dt m dt = 2T m H 0 ( + z) Ω 0 ( + z) 3 + λ + 8σ T a r T 4 γ 3m e c y e (T γ T m ) (40) 4. (First Objects) CMB z 5. Intergalactic medium (IGM) z>5 first objects.. virialize cooling. cooling diagram. 4.. Cooling diagram progenitor free-fall time cooling time. t cool t dis t rec t form time scale H 2 (abundance) Time scale H 2 abundance T<0 4 K cooling rate H 2 abundance. H 2. T y e T<0 4 K. 4 time scale t dis t form t cool t rec H 2 dissociation time formation time cooling time recombination time) H 2 abundance (Nishi et al. 998).
16 4 time scale t dis n H 2 n ṅ dis = H2 H 2 i ki dis = n H2 n i t form n H 2 n ṅ form = H2 H 2 ij kform t cool T T = t rec n e ṅ e = i k dis i n i (4) y H2 = (42) ij n i n j ij kform ij n N n i n j 3k B T (43) n N m p Λ H2 y H2 n e k rec = n e n p k rec (44) n e n N n i i y i i abundance ki dis H 2 i H 2 k form ij i j H 2 k rec recombination Λ H2 H 2 cooling t dis t form. t dis (4) y H2 t form (42) y H2. 2 time scale t dis = t eq dis (45) t form = t eq y H2 formy eq (46) H 2 eq H 2 ((48) (49) ).. t eq dis = teq form (47) time scale t sys t dis t form. t sys t cool t rec. t sys y H2. ) y H2 >y eq H 2 dissociation formation. y H2 t dis. t dis y H2 t dis <t sys y H2 y eq H 2. 2) y H2 <y eq H 2 y H2 t form. y H2. t form. (42) t form y H2. t sys >t eq form (= t dis) t sys t form. ) 2) t dis t form t sys H 2.
17 H 2 dissociation formation H 2 Appendix C dn H2 = n 2 R 3 R 4 R 6 R 7 dt H[n e + n n H R 4 + n H +R 5 + R 2 /n H + ] N n H R 7 + n e R 8 + R 3 /n N R 9 R 8 n H2 [n H +n e + n n H R 7 + n e R 8 + R 3 /n H R 0 + n e R + R 4 /n N ] (48) N R n (Table 7). H 2 formation dissociation. dn H2 = 0(49) dt T y e n eq H Cooling H 2 H 2 H cooling. T<0000 K cooling H 2. cooling H H 2 H 2. H 2 abundance H 2 H 2. Martin et al. (996) Forrey et al. (997) (n 0.cm 3 ) cooling Λ H2 log 0 ( n H n H2 erg cm 3 s ) = log 0T m 48.05(log 0 T m ) (log 0 T m ) (log 0 T m ) 3 (50) H 2 abundance Time scale virial T vir y e H 2 abundance. T vir y e (4) (43) (44) y e T vir plane 3 (Fig 3). t rec = t dis t eq cool = t dis t eq cool t dis = t 2 rec (5) t eq cool yeq H 2 (43). (5) Appendix D.
18 6 0. t rec fastest t dis fastest 0.0 y e t cool fastest t rec =t dis t cool =t dis 0-5 t cool =t rec T(K) Fig. 3. y e T vir plane t dis t cool t rec Fig 3 3 y e T vir plane H 2 ) t dis <min(t cool t rec ) H 2. y H2 = y eq H 2 (52) 2) t rec <min(t cool t dis ) H 2. H 2 abundance recombination abundance t form = t rec. (4) (42) t form = y H2 /y eq H 2 t dis y H2 = y eq t rec H 2 (53) t dis 3) t cool <min(t rec t dis )
19 7 H 2. H 2 abundance t form = t cool. y H2. y H2 = y eq H 2 t eq cool /t dis (54) ) 2) 3) vilial Fig t cool =t rec t cool =t dis c c y H T vir (K) Fig. 4. virial H 2 abundance Free-fall time cooling time y e T vir H 2 abundance time scale. H 2 cooling time scale t cool
20 8 time scale t ff ( 0 ) time scale t H. time scale. t ff 3π ( ) /2 32Gρ vir (55) 3k B T vir n vir m p Λ H2 y H2 (56) t cool t H H (57) ρ vir 8π 2 Ωρ cr n vir Ω b ρ vir /m p ρ cr =3H 2 0/8πG ρ vir virial n vir virial m p 3 time scale ( + z vir ) T vir plane 3 (Fig ). ) t ff >t cool vilialize H 2 cooling. 2) t H >t cool >t ff cooling.. 3) t cool >t H vilialize. (baryon dark matter)m t ff t cool t H T vir (Blanchard et al. 992). T vir = 485h 2/3 ( M M ) 2/3 ( +z vir 00 ) (58) z vir virial
21 9 5. Table. 3. Table : Ω 0 λ 0 λ 20 m ( ) ( λ ) ( λ ) abundance H D Li He abundance Y e =0.24 ± (Peimbert et al. 2000) (D/H)=(3.0 ± 0.2) 0 5 (Burles et al. 200) (Li/H)= (Ryan et al. 2000) z=0000. H 0 ( ) 00h (km s Mpc ) h=0.67 T γ0 ( CMB ) (K) Ω b ( ) η 0 h 2 η 0 ( ) 5.5 N ν ( ) :3 Chemical network reaction Appendix A. First objects time scale Appendix B.
22 Primordial chemistry chemical reaction network. Fig z 000 He z 000 H D z<000 Li recombination. H H + D fractional abundance H 2 H + 2 H - fractional abundance D + HD + HD H H 2 D z +z He fractional abundance He + HeH + fractional abundance Li LiH Li + LiH 0-20 He Li z +z Fig. 5.. H( ) D ( ) He ( ) Li ( )
23 2 Fig 6 7 λ λ chemical reaction network. λ recombination. fractional abundance H H + H 2 H + 2 H - H z D fractional abundance D + HD H 2 D + HD z Fig. 6. λ ( ) λ ( ) H D
24 22 He fractional abundance He ++ He + HeH z fractional abundance Li Li + LiH LiH + Li z Fig. 7. λ ( ) λ ( ) He Li
25 23 Fig 8 λ λ 2 λ T r T(K) 0 λ 20 =0 0. λ 20 =0 0.0 λ 20 = λ 20 = T m z Fig. 8. λ ( ) λ ( ) Fig 9 H 2 HD abundance. H 2 HD H 2 H H. 2 H 2 HD abundance λ. H 2 HD cooling
26 24 first objects.. z = H 2 HD Table H 2 fractional abundance HD λ 20 = λ 20 = z Fig. 9. λ ( ) λ ( ) H 2 HD Table 2: z = H 2 HD abundance y e y H2 y HD ( ) ( λ ) ( λ )
27 First objects λ first objcets ( ). Fig 0 z = y H2. z =0 z =00 H 2 H H + 2 abundance z =200 H abundance. H 2. λ abundance z=0 00 abundance y H2 0-6 z=0 0-8 z=00 z= T vir (K) Fig. 0. z= H 2 abundance Fig z = 50 H 2 abundance 4..4 first objects. (t ff >t cool ) cooling time scale first objects. (t H >t cool >t ff ) cooling first objects. (t cool >t H )
28 26 time scale first objects t >t H >t >t cool ff t ff >t cool T vir (K) 3000 t cool >t >t H z vir Fig.. ( + z vir ) T vir plane first objects. Fig 2 λ first objects. λ. (58). first objects. 0 6 M λ cooling first objects.
29 t cool =t ff t cool =t =t H t =t cool-λ ff-λ t =t cool-λ H-λ t >t H >t cool >t ff t >t H-λ cool-λ >t ff-λ t >t ff-λ cool-λ T vir (K) 3000 t ff >t cool t cool >t >t H t >t cool-λ H-λ M 0 6 M 0 5 M z vir Fig. 2. ( + z vir ) T vir λ ( ) plane first objects. ( )
30 28 8. ) Kimura et al. (200) λ. 2) First objects H 2 λ. 3) Time scale first objects λ. ) 2) 3) λ. -Acknowledgement-.. ( ) ( ) ALMA.
31 29 9. APPENDIX A. Table 3: Reaction rates for Hydorgen species reaction rate (cm 3 s or s ) notes H + +e H+γ ( + z) 0.58 R 2c H + + γ H+e ( + z) T.5 γ exp( 39472/T γ) R c2 H+e H + γ Tm exp( T m /6200) H + γ H+e. 0 Tγ 2.3 exp( 8823/T γ ) H +H H 2 +e T m Tm 0.7 T m < 300 H +H + H + 2 +e Tm 0.35 T m Tm 0.9 T m < 8000 H +H + 2H Tm T 0.9 m T m H+H + H γ Tm.8exp( 20/T m) H γ H+H Tγ.59 exp( 82000/T γ ) T m exp( 32400/T γ ) H + 2 +H H 2 +H H + 2 +e 2H T 0.5 m H γ 2H+ +e T.48 γ exp( /T γ ) H + 2 +H 2 H + 3 +H H 2 +H + H + 2 +H exp( 2050/T m ) T m exp( 4000/T m ) T m > 0 4 H 2 +e H+H Tm.27 exp( 43000/T m ) H 2 +e 2H + e Tm 0.35exp( 02000/T m) H 2 + γ H + 2 +e Tγ 0.35 exp( 78500/T γ ) H + 3 +H H+ 2 +H exp( 7560/T m ) H + 3 +e H 2 +H Tm 0.65 H 2 +H + H γ.0 0 6
32 30 Table 4: Reaction rates for Deuterium species reaction rate (cm 3 s or s ) notes D + +e D+γ ( + z) 0.58 D+γ D + +e ( + z) Tγ.5 exp( 39472/T γ ) D+H + D + +H Tm 0.28exp( 43/T m) D + +H D+H Tm 0.28 D+H HD + γ D+H 2 H+HD exp( 3876/T m ) T m > 250 HD + +H H + +HD D + +H 2 H + +HD HD+H H 2 +D exp( 3624/T m ) T m > 200 HD+H + H 2 +D exp( 464/T m ) HD+H + 3 H 2 +H 2 D + (2. 0.4logT m ) 0 9 D+H + HD + + γ Tm.8 exp( 20/T m ) D + +H HD + + γ Tm.8exp( 20/T m) HD + + γ H+D exp( 32400/T γ ) HD + + γ H + +D exp( 32400/T γ ) HD + +e H+D Tm /2 HD + +H 2 H 2 D + +H HD + +H 2 H + 3 +D D+H + 3 H 2D + +H Tm H 2 D + +e H+H+D Tm / H 2 D + +e H 2 +D Tm / H 2 D + +e HD + H Tm / H 2 D + +H 2 H + 3 +HD exp( 25/T m ) T m 0 2 H 2 D + +H H + 3 +D T m > T m exp( 632/T m )
33 3 Table 5: Reaction rates for Helium species reaction rate (cm 3 s or s ) notes He ++ +e He + + γ.89 0 [ 0 Tm 9.37 ( + Tm 9.37 ) ( + Tm ).7524 ] He + + γ He ++ +e Tγ.63 exp( /T γ ) He + +e He + γ [ Tm 5.54 ( + Tm 5.54 )0.309 ( + Tm ).69 ] 7 He + γ He + +e Tγ.23 exp( /T γ ) He + H + He + +H Tm 4.74 He + +H He + H T 2.06 m He + H + HeH + + γ Tm [+9.9exp( 2570 )] He + H + He + + γ T 0.5 m T m T.06 m T m > 0 3 He + H + 2 HeH+ +H exp( 677/T m ) He + +H HeH + + γ Tm 0.33 T m T m > 4000 HeH + +H He + H HeH + +e He + H T 0.5 m HeH + +H 2 H + 3 +He HeH + + γ He + H T.5 γ exp( 22750/T γ ) He + γ He + +H T.2 γ exp( /T γ )
34 32 Table 6: Reaction rates for Lithium species reaction rate (cm 3 s or s ) notes Li + +e Li + γ [ T m /07.7 ( + T m /07.7) 0.62 ( + T m / ).388 ] Li + γ Li + +e Tγ.45 exp( 60500/T γ ) Li + +H Li + H Tm Tm T m Li + +H + Li+H Tm Tm 0.5 T m Li+e Li + γ Tm 0.58 exp( T m /7200) Li + γ Li + e Tγ.4 exp( 800/T γ ) Li+H + Li + +H Tm 7.9 exp( T m /20) Li+H + Li + +H+γ Tm 0.05 exp( T m /282000) Li+H LiH + γ ( Tm.5 Tm.2) LiH + γ Li + H Tγ 0.3 exp( 29000/T γ ) Li+H LiH + γ Tm 0.8 exp( T m /500) Li+H LiH + γ Tm 0.34 Li+H LiH+e Li +H LiH+e LiH + +H LiH + H exp( 67900/T m ) LiH+H + LiH + +H LiH+H Li+H LiH + +H LiH + + γ dex[ logT m 0.35(logT m ) 2 ] Li+H + LiH + + γ Tm 0.49 LiH+H + LiH + +H LiH+H + Li + +H LiH + +e Li+H Tm 0.47 LiH + +H Li + H exp( 66400/T m ) LiH + +H Li + +H LiH + + γ Li + +H exp( 900/T γ ) LiH + + γ Li+H T γ exp( 97000/T γ )
35 33 B. Table 7: H 2 abundance reaction R n rate (cm 3 s or s ) reference )H+e H + +2e Tm 0.5 ( + (T m /0 5 ) 0.5 ) exp( /T m ) HTL 2)H + +e H+γ Tm 0.7 (+(T m /0 6 ) 0.7 ) ) HTL 3)H+e H + γ Tm 0.93 exp( T m /6200) GP 4)H +H H 2 +e FC 5)H +H + 2H Tm 0.5 FC 6)H+H + H γ Tm.8 exp( 20/T m ) SLD 7)H + 2 +H H 2 +H GP 8)H + 2 +e 2H Tm 0.4 SLD 9)H 2 +H H H min( exp( 2050/T m ) GP exp( 4000/T m )) AAZN 0)H 2 +H 3H Tm 2.0 ( + (2.3T m /0 5 ) 3.5 ) AAZN exp( /T m ) GP )H 2 +e 2H + e Tm 0.35 exp( /T m ) GP 2)H + γ H+e. 0 Tγ 2.3 exp( 8823/T γ ) GP 3)H γ H+H exp( 32400/T γ ) GP 4)H 2 + γ H + 2 +e Tγ.56 exp( 78500/T γ ) GP AAZN: Abel et al. (997); FC: Fuller & Couchman (2000); GP: Galli & Pall (998); HTL: Haiman Thoul & Loeb (996); GP: Galli & Palla (998); SLD: Stancil Lepp & Dalgarno (998); C. H H + 2 H 2 H H H n H dn H dt dn H /dt 0 n H + 2 n H + 2 dt = n H n e R 3 n H [n H R 4 + n H +R 5 + R 2 /n N ] (C) n n H H n e R 3 n H R 4 + n H +R 5 + R 2 /n N (C2) = n H n H +R 6 + n H2 n H + n H + [n H R 7 + n e R 8 + R 3 /n N ] (C3) 2
36 34 n H + /dt 0 2 n H + 2 n H n H + R 6 + n H2 n H +R 9 n H R 7 + n e R 8 + R 3 /n N (C4) n H2 n H2 dt = n H n H R 4 + n H n H + R 7 2 n H2 [n H +R 9 + n H R 0 + n e R + R 4 /n N ] (C5) (C6) (60) (62) = n H2 n e R 3 R 4 n H R 4 + n H +R 5 + R 2 /n N R 6 R 7 R 9 R 7 +n H2 n H + + n n H R 7 + n e R 8 + R 3 /n H n H2 n H + N n H R 7 + n e R 8 + R 3 /n N n H2 [n H +R 9 + n H R 0 + n e R + R 4 /n N ] (C7). D. Fastest time scale (5) 3 timescale. t rec = t dis t cool = t dis t cool = t rec (D) (D2) (D3) (4) (44) t rec t dis y H2 t rec = t dis (D4). t cool = t dis t dis <min(t rec t cool ) t cool = t eq cool (65) t eq cool = t dis (D5). t cool = t rec t rec <min(t cool t dis ) t form = t rec. t form = y H2 /y eq H 2 t dis y H2 = y eq H 2 (t rec /t dis ) 3kT t cool = n N m p Λ H2 y H2 (D6)
37 35 (62). t cool = 3kT n N m p Λ H2 y eq ( t dis )=t eq cool H 2 t ( t dis ) rec t rec t eq cool t dis = t 2 rec (D7) (D8)
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paper02v.dvi
Monte Carlo Λ First Objects III 1 Contents 1 Introduction 4 2 VCT 7 2.1 VCT......................................... 7 2.2............................................... 8 2.2.1 1.................... 8
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