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N 体シミュレ ションで探る 銀河系中心部の若い星の起源
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(2009) i 7 F2p¯15) 7@" V, ,iyzt{|b, !"#$%& :;F2"# 5JE5" '()* +,-./01234*5 "h ,i51[RS/T?@"" 6 77 8,,+,9,:;<= 5 1 : 1 NOPQRS,56: 9 Myr "15/>? ; Vopqrs5= ,]^_`a L4 @ABC/DE5" L5 ,<?2 27 ,,/= JK 8 Xh /T?@" 8,+,9 : ,L55M ; V,2<o?@" , 1 : 1 NOPQRS/T?@"8U? FG/=X @"U45"h V1 : 1 NOPQRS/T?@" WX /\ Vi 5 ,h 8,FG,:;<H7I YZ[\ Z L55M ,]^_`a/6bcdefg56h 9u$%&'(/F?@ABC/D i 5 RS/T?@"6,:;<ABC E5" +,M/ ,^[? <ja/ ", 1 : 1 N ,kl< (1, 0) /mn7opqrs5tc OPQRS/T2 /ABCDE5" b7u,56 vw,a\ @,x,y 8, ¡/F?@ L5 zt{|b}8,,kl5 ~ 5M-¢ £¤ +,x5,kl<1a5 @71?9u"<ABCP¥8 ° 104 ± °4² 189 Q6 /0|*6/KL!MW XYZ RSTU O / 20 ¡¢#$EhJ/,DO £ /#$45¤-¥¦6?§ ¨HI:©ª9 20 ¡¢#$EhJ/45 KL!MJ/« I¬ .hJ/KL!M:N! ?P Q7 wxyz*w{|'[w{'] ® /¯ SKL!M%&'()*+ 0.05 pc °;:R±8/ ,DO Fujii et al. (2010) Q 1 Eh²³14) Q8 /0:EFG q/45 /0 ,:´ 60 µ²9¶ KLp!MV. q/12·?6¥ ¦¸ Fujii et al. (2010) Q 3 Eh² ³14) ! "#$%&'()*+,-./0 0.1ῌ1 pc 12345678 9:;< S-stars =>?@ABC?,D /0:E/FG HI J/ KL!M:N!O?-P Q 6 /0:EFG /,RSTUVWXY Z,[\']- /0; J/ ^/:_`+a*,b/0!M:N cd efA:E/0/g?hi <=j J//0;:khlO 8 /0KL!M:mn/0g? o KL!M:J/N!O KLp!Mq/J/r? stu?cv : 5. ῏ῐῌ῍ῑ῎ /0:EFG /45 ,tu? Q 8 Q 7 wxyz*w{|}~'[ w{']!M4, : /0:EFG /45 / , tu q/451.5 : - / S-stars Eh- ?D9 3), 16), 17) wxyz*w{| ll*+ 190 E845, ,?P ¹º» 2011 ¼ 4 º <5 !LM >NOPQ "RSLJ&T> UVWX YZ[%&\!T> !LE]^O"K<J5 6. ῍ ῌ ῎ _` a2 N b789:7;.c d BRIDGE e2 f%& 'g>N!hH!789:7;.iJ 69 t<$®F!¯° 7; 'g ±.²" 0.3 pc ³!>!!/´µ ¶5 ,-./01 (e 2) 1J& 5 Fujii et al. (2010) 6 5 L(«¬14)5 5 f!jk >N>!lmXb"n( PQ "O >N"op qrs[%t >N!u.vVJ> "PQ ! 1 : 1 RS LJ&=%"K<J5 % wx34$%&1<Ja2uy z{0B5 x 789:7;.>N LJ&=%>! |>! }!~ T>!!1.5 !O )*+./01 S-stars ! JYZjkLE]^2&5 ῐ 6 10 t<$®F!¯° 7; 'g >! ?@A5 >N LJ&=%>·¸>N! $¹ (cos(i)I1) " DE,º ?@A=$FO . /01DE5 Fujii et al. (2010) 6 5 L(«¬14)5 ῏ !! 2&x 5 'g_`2&EV[J !!"#E2x 5 S$_`B%p &' 2x5 x !&E V[( [$[xx1cu.EV[J () *2x5 +,_` S-stars 2&-¡¢£¤¥L(¦§¨g&x 5 The American Astronomical Society ! "#$%&'( )*+,-./01 2&34$%& 6), 18) !©ª&6«¬2&x5 5 6 9 6 10 789:7;.<$$% =%>! !?@A!B 5 %C DEF% G <$)*+1H2 ./01 ( f(e)Ie2) 1J&"K » 104 ¼ »4½ 191 ῎῍῏ῌ 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 16) 192 Krabbe A., et al., 1995, ApJL 447, L95 Paumard T., et al., 2006, ApJ 643, 1011 Bartko H., et al., 2010, ApJ 708, 834 Lu J. R., Ghez A. M., Hornstein S. D., Morris M., Matthews K., Thompson D. J., Becklin E. E., 2006, Journal of Physics Conference Series 54, 279 Ghez A. M., et al., 2003, ApJL 586, L127 Gillessen S., Eisenhauer F., Trippe S., Alexander T., Genzel R., Martins F., Ott T., 2009, ApJ 692, 1075 Levin Y., Beloborodov A. M., 2003, ApJL 590, L33 Gerhard O., 2001, ApJL 546, L39 Figer D. F., 2004, ASP Conf. Ser. 322, 49 Portegies Zwart S. F., McMillan S. L. W., Gerhard O., 2003, ApJ 593, 352 Kim S. S., Morris M., 2003, ApJ 597, 312 Fujii M., Funato Y., Makino J., 2006, PASJ 58, 743 Fujii M., Iwasawa M., Funato Y., Makino J., 2007, PASJ 59, 1095 Fujii M., Iwasawa M., Funato Y., Makino J., 2010, ApJL 716, L80 Fujii M., Iwasawa M., Funato Y., Makino J., 2009, ApJ 695, 1421 Buchholz R. M., Schödel R., Eckart A., 2009, A&A 499, 483 17) Do T., Ghez A. M., Morris M. R., Lu J. R., Matthews K., Yelda S., Larkin J., 2009, ApJ 703, 1323 18) Schödel R., Ott T., Genzel R., Eckart A., Mouawad N., Alexander T., 2003, ApJ 596, 1015 The Origin of Young Stars near the Galactic Center Michiko FUJII Kagoshima University, 1ῌ21ῌ35 Korimoto, Kagoshima 890ῌ0065, Japan Abstract : Young massive stars have been found within 1 pc from the Galactic center (GC). Since in-situ formation of stars is di$cult because of the strong tidal field of the central supermassive black hole. We performed N-body simulations of young star clusters migrating to the GC and investigated whether the star clusters can carry young stars to the GC. We found that intermediate-mass black holes formed in the clusters carry young stars to the GC by a 1 : 1 mean motion resonance and the migration scenario can reproduce the distribution of the observed young stars in the GC. ῍῏ῌῐ 2011 ῎ 4 ῌ