野辺山ミリ波干渉計およびASTE望遠鏡を用いた双極分子流による誘発的星団形成領域の観測的研究

全文

(1)

(2) ASTE ! "#$%&'( ). *. +. ,. ῍

(3) . 113῍0033 7῍3῍1. e-mail: [email protected].

(4) ASTE OMC-2/FIR 3,4 . !"#$%&'()*+, -.% /01%2 3456789:.!. ;< /=>?@A2 B(;<CDE /FGHI2 :.!J;<?K /&LM$NO2 ; <5PQR /STM$NO2 FGHI.UVWXYZ[:\'9!?@]8 /^M$N O2 .U_àb3cdJB6efg 93C =>?@ADEf4hP;<i 11 j klm /hP4.;<n2 3o!Jpq:r3Cfg J3lms?tB= >?@AFGHICuv:wx9fy 93Ci J3lm3%B\z! r3Cd!fq {|}~ d!VWXY %&' ab3]Nfg -.%3789f;<(;<DEB (;<C{|}~e J"#$%&'wx:.!B!JBvfg. 90% J$%&. 1. - . / 2. "'()*$4)+ fῌCCb(/ ῔!"#. ῒV*ῒV (?0.1 pc0.1 pc) p. $%&"'()*$+ ,-./ 012*. qzr34ῐ"H/ "D345. (ῌ105 cm3) 34567 20156/ 348. 6 N pcN pc v-%&C(/. 9:; <=>?0.1 [email protected] AB C(/ ,-. ^v 3¡$¢&/ *ῒVv_. DE-"$ FG῏HDI J#. Ù$%&"ῌ£$D¤/ ῒV_. $+ KLMNBO/ PQ R῎?140 pc STU. `]¥HCD+ D¤/ ῒV. $G῏HDῒVW XYHZ348[H. \ΐ]^_`"¦§H/ ^¨ ]. )/ \ΐ]^_`]"ab)cD+ %. $C©. J/ F20156de]fΐghijkl. CD+. mῑnoipqC(rs2t N km s. 1. ?Nu km s1 J56vwcxyU zr34 ῐI &*Y{|}~"῏H)cD1), 2), 3)+. &*Dª«"¬(C)*^. 2. %&01234 ῒV®¯°±²e/ mῑ. E-./ ,-3489:C(NM. "³´µU¶῎ῒV HII ῒV/ zr34ῐ&. " ]$ F I J#$+ . *D·¸ ¹]ῌº "H)*$%&"'. 478. »¼. 2009 B 8 ».

(5)

(6) ;!( NGC1333

(7) ; )* +e6 !"#fgh ijMNkl gh <mnogh@ bJp6 mno q. SK-1 !r8st

(8) . uvp!E +e6 !2366) )* +

(9) wx0123 67 bJMN yz{J|c( } ~ Ee 1. ¶ · ¶ ¸ B + C 4 (2MASS) OMC-2/3

(10) ; HII

(11) ; M42, 43 " #ST $%01¹²º¯ FIR 4

(12) ;ST2( . U4! {+C (GMC) Orion A " # S T Orion Molecular Cloud-2/3 (OMC-2/3)

(13) ;.

(14)

(15) ; FIR 3, 4, 5.

(16) ;,( < 1@7) OMC-2/3

(17) ; 1.3 mm. N$%H 21 KLst8).

(18) . 850 mm N$%H 33 KLst. . !"#. &69) 6 KLst. $%

(19) . '( )*+U 14 F6AH ). &'!( )*+,(. *+l(10) )*+. . !

(20) !(

(21) ;. )*+-./

(22) !. !# EU FIR 4 OMC-2

(23) ;q. 01234 567 !. UUN$%. #8 9:

(24)

(25) ; <: =

(26) >?. 1E

(27)

(28) ;.

(29) ;@ !( A(B+C L 1551 IRS 5 NE D

(30) (IRS 5) EF. H 0. !. 3. ῍ῑῐῒῌ῍ῑ῎῏. 6 )*+D

(31) (NE) GHIJK. )*+KLMN. LMNO! NE 6 !"#. )*+!KLMN!L. NE IRS 5 )*+P. ghp!! ( KLM. Qῌ ( RST( NE GHIJKLM. N#gh!

(32) ()E. NUPQ(!EVWXYZ.

(33) ¡¢!LK

(34). !"# 6 NE ! IRS 5 . ;p£!+¤¥¦. )*+[ <\7

(35) ]@. . ^! NE IRS 5 +!O. LMN,( 01y )*+. YZ _6 !23àF. KLMN ¨MN© ! ¨Lg. ? bJ)*+cd(. h*ª© !e «¬(Ep!. 1. 5). (E( )*+A§K. ῌ 4JMN®¯°±²³aH%´µJ 1. » 102 I. »8¼. 479.

(36) >2. >

(37) 789:;<

(38) 789:;< (Nobeyama Millimeter Array; NMA) 10 m " 6 2W3 !I:;<R 6 ./u !"#^¡¢W! &!W!"£¤¥i./%&01 ¦ §2W 1 §} ¨ © 3 4 5 6 & ' I ª « & ' ¬ > Atacama Submillimeter Telescope Experiment (ASTE) JH$ ASTE %®9¯°±&'S 4,800 m ²²U ³U´³R 10 m DE89IJHR.

(39) . !. "#$%&'(. 4. 4.1. .

(40) . )*+, - ' ./ 0. > 3(a), (c) > 3(b), (d) 12CO (JY3ῌ2, 1ῌ. 1*23456&'

(41) 789. 0) "gh =i!i!jk. :;< (NMA) => 2? @ AB. ? lh῍2 =i!i!2WJm2? n. +, CDE89"+,- ' . SVT on12 CO "+,. ./ FGHDE89IJH Ata-. pqN FIR 3 rstuv. cama Submillimeter Telescope Experiment(ASTE). w` &! FIR 3 'x_j. => 2?. yz[\"$n&on. ./%"KL @MNOPQR. @ s{"A'1 (0.09 pc) . ST+, UVT34W2%. r{"A'1 (0.19 pc) | 2. T'SB)*5X%&'. }. ῌ. &! s{"' ~j. H CO (JY1ῌ0) "KL Z[\. 2 W!&on. ")*+, ]0^VT34W2. . 13. % CO(JY1ῌ0) "KL NMA . @ ASTE =FGH? NMA =:;<? . ./_` @ [\"'ST+. W!12 CO " ' &!:;. , =a,b? c%&. ! cd. <0`W!u A'`34. 12. ef"RDE89 CH3OH(JKY7Kῌ6K;. T' R = NMA u. KY0, 1, 2) ]0^ SiO(vY0, JY2ῌ1) "KL. 55. . ?. (0.12 pc) 34n2#$. ῍ i!i!2WJm2+,µ¶·³u¸¹01º'º» 2. 480. ¨(¼. 2009 ) 8 ¼.

(42) 3. 4.2. CO(J 3ῌ2; ) '12 CO(J 1ῌ0; ) tuvwm 'xuvwm `m

(43) xs16)

(44) 1.3 mm 2s7)

(45) 3.6 cm freeῌfree sIz@11)

(46) NMA ,Iz@

(47) ASTE, NMA 89A&"#GHIJK'$LIz%& 12. FIR 4 . YI FIR 4 Z[\]'^_ . ῌ. 4(a)

(48) H CO (J 1ῌ0) 13. . !"# FIR 4. FIR 4 Z[\]à

(49) 1.1 km sῌ1 ' b OMC-2/3 cde ῌ1. !"#fg. 'BC%h&14) ijkl. $%&'$()*. à 0.8 km s. +

(50) ,-. 45 m /01234567. mcdnOopefgàq0.5 km. 89:;'<=>?@. 12), 13). A 67. sῌ1 'BC%Ursh&15). 89'BCDEF&GHIJK'$. 4(b)

(51) tuvwm'xuvwmK. L NMA IM&89INO' FIR 4 . %yzA{U tuvwm

(52) |P x. @

(53) FIR 4 PQR U ST. uvwm

(54) Q}h$*GHIU~ . GHIUV'$()* WX . &$. 102 . 8¡. 481.

(55) 4.3. 4. (a) H13COi(Jj1ῌ0) #$ klg3OP+ (b) m;no3m pqJr s;no 3s pqJr)OG0)*+ i, t, uv 3 BC+. 5. (a) wxyzM CH3OH(JKj70ῌ60) m;no (b) s;no N3OP+ (c) SiO(vj0, Jj2ῌ1) #$ m;no N3OP+ i, t, uv 3 BC+.

(56) . 4.4. 5(a)ῌ(b)

(57) . .

(58) . 6(a), (b) @ A,BCDEF- G0 3.3 mm HI

(59) JKLM N3OP+. CH3OH ! " SiO # $ % & ' ( ) *. 0QG RS36TUA ;2VW X. + CH3OH, SiO , FIR 3 -./0. . 12345%&360+ '(. S360+. 78 , FIR 3 9:;< = >)?/0+ 482. YZ3[\)]TDEFR 6(a) 3[ ^_ àb 1.3 mm I

(60). JKLM %& cd8 efg YZh)[\ V{|}. 2009 ~ 8 |.

(61) °6. 3.3 mm |}S¥># (a) (b) % ±²³"*{* ° $ ´°%g8R

(62) 67ST+Uµ¶ (uniform weight) X·° # ¸, , ¹%° 3 #. 7)

(63) FIR 3 . S 3.3 mm ?h). FIR 4 3.3 mm . i$ FIR4 % 11 jkPlmnof. . *"()# *lmpq;. !"# "$ FIR 5 . 3.3 mm %&'

(64) (")#. (rst$ u $ P% 5 I (H2,250 AU), 0.78.

(65) *$ 3.3 mm +,%-ῌ./. v u ῍4$ 1.6w107 cm3 . 0123$ FIR4 /01*4567. u $ P%xyzg){* |}. 8$ 9:;% 1.3 mm < =. #. FIR 3 > 3.3 mm ?%@ AB MIR 21 CDEF# MIR 21 % MIR 22 GH3 I (1,400 AU῍3) JKL5 MN* 16)# "$ ! ! % H3 IOPQR

(66) 67ST+U. . . # $ . ~S!(%(*. (# xyzSM

(67) >C u. %(#. 5. 5.1.

(68) . L abL "*k'

(69) . V""!*W+X(")#

(70) *$. YZ+[ <. FIR 3 %01YZ+[S'. Sg$ +, . "* MIR 21, 22 %+[\L. ; $ P67 ; $ <. ]%("MN* #. ÔS ¡

(71) +[. FIR 4 %^_%EàbLcdef . MN* # "(*$ NMA. &' ¢; £`¤"*¥> #. S$ g8R

(72) ef67ST+U ῍3 e¦§¨# ©ªv «¬;(# 1 AU®H1.5 ¯ km# ῍4 v u # 1 v u ®1.9884w1030 kg º 102 ». º8¼. 483.

(73) ]7. CO(J1ῌ0; (a)), H13CO(J1ῌ0; (b)), SiO(v0, J2ῌ1; (c)), CH3 OH (JK70ῌ60 (d)) à ῌbc]" #àῌbc] FIR 3

(74) qr^'_)*XO]KR0" g^b c d^à- J" ]¡ 2 ¢g FIR 3 1 FIR 4 à-hJ" 12.

(75) . 12. CO(J3ῌ2) FIR 3

(76). 12. CO(J1ῌ0) àῌbc] (a) . FIR 3

(77) FIR 4 'ijk'> bclmn. . k.

(78). !" #. àῌbc]'op0 L 67Cqr. $

(79) %&'()*+. 1stuv1VWXY-hw*!017)" A. ,-./ *!0123 0" 4 NMA. x'o!*= FIR 3

(80) FIR 4. . L 67C-*!0" #(B'. H CO (J1ῌ0)

(81) FIR. yVWXYSTz '

(82) p*bcl{m*!0". 4 5' U 67'89:;<-=>#1. # |}cuv H~. ?

(83) '. 'R0#1-h 1|}cu. 13. )" # U 67;<'@). A0(B' FIR 3 C*!0" #. v1VWXY -hw*!0". #1

(84) FIR 3 FIR 4 DEFG'.

(85) . HIJ0#1KLM;<-NO123 . ##AK(B' FIR 3

(86) . 0" PQ #LM;<R0ST- UVWXY. 1 FIR 4 DEFG1VWXY-*. STZ 1[\". !0R0" 'H~KuvVWX.

(87) ] 7 CO(J1ῌ0), H 12. 13. Y1!B-*O0 . CO (J1ῌ0), SiO(v. -J0#1K VWXYn*!0#1. 0, J2ῌ1), CH3OH(JK 70ῌ60) . 01. FIR 3

(88) ^'_)àῌ. CH3OH, SiO '(0-BH. bc]KR0" d^ FIR 4

(89) ef g^. ~'()* yvz

(90) O0. bc-h*!0". KR0#1 *!018), 19)" >A #. 484. B0". £¤¥¦. 2009 § 8 ¥.

(91) ?@ATUVW0 +XYNZ21 D [\ 11 689,JKLMN, ]G0*D^ 11 689(_ JKLMN]G+*`Dab&cd ef*g4 FIR 4 $%&'hijD 11 689(_k5l103 AU m n + oab&cdk5l103 AU m4 Z[ 89(_ab&cd pbqb5r 89:,JKLMN 41sG]+;XYN,m+*` 12 < +89:,

(92) t]G 0u0*D^ [00S(.

(93) *12S(*ef D[ 00S( FIR 4 $%&'h,v ww;xg12yzM1{|7 k3.8l104 } 5"

(94) *12 S( FIR 3 ~

(95) * 122 } mz ³8. FIR 4 o´.µ¶´.BC ?·@A¸¹p. MD k1.4l104 } D[ 00S(

(96) *12S(pbqb 5r 89:,

(97) ]+4.

(98) 4.3 FIR 3 . XYN,m+*`12. !"#. +[/ ,. FIR 4 $%&'() CH3OH,. D+41 11 689:,BC;. SiO * + FIR 3 . XYN*`G + 11 689. FIR 4 $%&'

(99) , . 0 ?,[0u0*D^. -.. 9 q 0^ . 5.2.

(100) . ef*g+ 11 689,J. 5.1 /0 FIR 3 FIR 4 $%. ?@A,{0*D . &',

(101) *12+,304. VF;w 5¡¢£¤. 5" 4.4 0 FIR 4 $%&' 11 67. w 7¥¦§y

(102) 41. 890+,30412 +. ¨©12ª©12 9. +0

(103) , FIR 4 $%&'* 11. ,«¬,y

(104) £¤41. 689: ;<=>?@A*B. J®mzMG m H. CD20EFG H+ I. ^ 9 J2 *7Z89. IJKLMN ODPQRS(. JJ¯°*12 ±² 11 6. º 102 ». º8¼. 485.

(105)

(106) . . . FIR 3 " FIR 4 &'(). FIR 3

(107) . ! "

(108) # $ [STEP 1] % . FIR 3

(109) #$ ! " FIR 4 &'(. 7uv8j/0k@ -./ 01 $

(110) . , . ) * [STEP 2] $ * FIR.

(111) a'yzV$. 4 &'() +,-./01. bW$.X Y{,,fa'!|$. 11 23 . [STEP 3]. ,C : [:&}_. 4 56 11 2. `[:&~1nd}\]^*+.B a. [STEP 4] ,789:;<=. '.g7 ! " U. FIR 4 &'() MIPS 24 mm >?.

(112) , b,, .;. @ 1 A , FIR 4 &'(. 0 DA :I< =. )

(113) B1. C,<=. 80 >''(9.?\]. 4C DA STEP 3 STEP 4 . ^ Atacama Large Millimeter/Submillimeter. EFG<=. Array (ALMA) .8, 7,a'U. 6. ῍. ῌ. @ U. ῎. ALMA NMA U.

(114) ./01HIJKL.M C N. g70 $ . OP QR!ST "# U. V. $,W$.X Y0% Z[. V$bW. $.X Y0C

(115) ,f10,D.U. M$. A0. :&\]^_`[:&a'b ASTE ( &)cd4e*+.B OMC-2/ FIR 4 ,fa'.g hi FIR 3

(116) #$ " FIR 4 -. j/0k@. ῐ. ῏. Byz CDDyzE. QFIR 4 &'()T * ,. F +YGE. +. b $ FIR 4 &'()lma'. Q>HT j I"¡ j¢J£¡ ¤KE>. 1nop, NMA U. LMNO¡ 4 rP¥¦Q. U. V$,W$.X Y0. ASIAA RS¡. TUbrP V+W.X Y§ . a'.g7 11 2j/0b. yz¨Z[\©. ]¡ ª%^_¡. . j/0E2q. àbn¡ c«¬®@.,o0 y. - r3bs?. z.¯Y,o0 dt ¤KE>. (K4560 11 23. °e ,Z`±"¡ (ASIAA) Gb. -/01$. KfH(².,o0,3³V,´. . a'µg NMA, ASTE. tE7uv8. ,tE9w . ?Lg¶ a'·V¸oh¸.ij. - U 7uv8x 10. _¹?² ,o0 k«º», . $ 11 2j/0

(117) 486. E¼l. 2009 m 8 ¼.

(118) ῎῍῏ῌ 1) Myers P. C., Bachiller R., Caselli P., Fuller G. A., Mardones D., Tafalla M., Wilner D. J., 1995, ApJL 449, L65 2) Saito M., Kawabe R., Kitamura Y., Sunada K., 1996, ApJ 473, 464 3) Momose M., Ohashi N., Kawabe R., Nakano T., Hayashi M., 1998, ApJ 504, 314 4) Lada, C. J., Lada E. A., 2003, ARA & A 41, 57 5) Yokogawa S., Kitamura Y., Momose M., Kawabe R., 2003, ApJ 595, 266 6) Sandell G., Knee L. B. G., 2001, ApJL 546, L49 7) Chini R., Reipurth B., Ward-Thompson D., Bally J., Nyman L.-A., Sievers A., Billawala, Y., 1997, ApJL 474, L135 8) Shimajiri Y., Takahashi S., Takakuwa S., Saito M., Kawabe R., 2008, ApJ 683, 255 9) Johnstone D., Bally J., 1999, ApJL 510, L49 10) Takahashi S., Saito M., Ohashi N., Kusakabe N., Takakuwa S., Shimajiri Y., Tamura M., Kawabe R., 2008, ApJ 688, 344 11) Reipurth B., Rodrı ÿguez L. F., Chini R., 1999, AJ 118, 983 12) Aso Y., Tatematsu K., Sekimoto Y., Nakano T., Umemoto T., Koyama K., Yamamoto S., 2000, ApJS 131, 465 13) Ikeda N., Sunada K., Kitamura Y., 2007, ApJ 665, 1194 14) 2007

(119) 15) Mizuno A., Onishi T., Hayashi M., Ohashi N., Sunada. 102 . 8. K., Hasegawa T., Fukui Y., 1994, Nature 368, 719 16) Nielbock M., Chini R., Mu ¨ller S. A. H., 2003, A&A, 408, 245 17) Takakuwa S., Ohashi N., Hirano N., 2003, ApJ 590, 932 18) Avery L. W., Chiao, M., 1996, ApJ 463, 642 19) Bachiller R., Pe ´rez G., M., Kumar M. S. N., Tafalla M., 2001, A&A, 372, 899. Millimeter- and Submillimeter-Wave Observations of the OMC-2/3 Region. II. Observational Evidence for OutflowTriggered Star Formation in the OMC-2 FIR 3/4 Region Yoshito SHIMAJIRI Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113ῌ0033, Japan Abstract : We have observed the OMC-2 FIR 3/ 4 region with the NMA and ASTE telescope. Our results suggest that the presence of an interaction between the out flow driven by FIR 3 and the dense gas associated with FIR 4. Moreover we have first found that FIR 4 consists of 11 dusty cores at a scale of 2000 AU. We suggest that the interaction triggered the fragmentation into these dusty cores, and the next generation of the cluster formation in FIR 4.. 487.

(120)