The Extraordinary Outburst in the Massive Protostellar System NGC 6334I-MM1: Flaring of the Water Masers in a North-South Bipolar Outflow Driven by MM1B

被引:48
作者
Brogan, C. L. [1 ]
Hunter, T. R. [1 ]
Cyganowski, C. J. [2 ]
Chibueze, J. O. [3 ,4 ,5 ]
Friesen, R. K. [1 ]
Hirota, T. [6 ]
MacLeod, G. C. [7 ,8 ]
McGuire, B. A. [1 ,10 ]
Sobolev, A. M. [9 ]
机构
[1] NRAO, 520 Edgemont Rd, Charlottesville, VA 22903 USA
[2] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland
[3] Univ Nigeria, Dept Phys & Astron, Carver Bldg,1 Univ Rd, Nsukka 410001, Nigeria
[4] SKA South Africa, 3rd Floor,Pk Rd, ZA-7405 Cape Town, South Africa
[5] North West Univ, Ctr Space Res, Phys Dept, ZA-2520 Potchefstroom, South Africa
[6] Natl Astron Observ Japan, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan
[7] Hartebeesthoek Radio Astron Observ, POB 443, ZA-1740 Krugersdorp, South Africa
[8] Univ Western Ontario, 1151 Richmond St, London, ON N6A 3K7, Canada
[9] Ural Fed Univ, Inst Nat Sci & Math, Astron Observ, Ekaterinburg 620000, Russia
[10] Natl Radio Astron Observ, Charlottesville, VA USA
基金
俄罗斯科学基金会;
关键词
ISM: individual objects (NGC 6334I); masers; radio continuum: ISM; stars: formation stars; protostars; submillimeter: ISM; STAR-FORMING REGIONS; II METHANOL MASERS; H2O MASERS; EPISODIC ACCRETION; MOLECULAR OUTFLOWS; PROPER MOTIONS; EVOLVED STARS; CEPHEUS-A; JET; MILLIMETER;
D O I
10.3847/1538-4357/aae151
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We compare multi-epoch sub-arcsecond Very Large Array imaging of the 22 GHz water masers toward the massive protocluster NGC6334I observed before and after the recent outburst of MM1B in (sub) millimeter continuum. Since the outburst, the water maser emission toward MM1 has substantially weakened. Simultaneously, the strong water masers associated with the synchrotron continuum point source CM2 have flared by a mean factor of 6.5 (to 4.2 kJy) with highly blueshifted features (up to 70 km s(-1) from the LSR) becoming more prominent. The strongest flaring water masers reside 3000 au north of MM1B and form a remarkable bow shock pattern whose vertex coincides with CM2 and tail points back to MM1B. Excited OH masers trace a secondary bow shock located similar to 120 au downstream. Atacama Large Millimeter Array images of CS (6-5) reveal a highly collimated north-south structure encompassing the flaring masers to the north and the nonflaring masers to the south seen in projection toward the MM3-UCHII region. Proper motions of the southern water masers over 5.3 years indicate a bulk projected motion of 117 km. s(-1) southward from MM1B with a dynamical time of 170 years. We conclude that CM2, the water masers, and many of the excited OH masers trace the interaction of the high-velocity bipolar outflow from MM1B with ambient molecular gas. The previously excavated outflow cavity has apparently allowed the radiative energy of the current outburst to propagate freely until terminating at the northern bow shock where it strengthened the masers. Additionally, water masers have been detected toward MM7 for the first time, and a highly collimated CS (6-5) outflow has been detected toward MM4.
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页数:15
相关论文
共 108 条
  • [1] ABRAHAM Z, 1981, ASTRON ASTROPHYS, V100, pL10
  • [2] ATCA 3mm observations of NGC6334I and I(N): dense cores, outflows, and an UCHII region
    Beuther, H.
    Walsh, A. J.
    Thorwirth, S.
    Zhang, Q.
    Hunter, T. R.
    Megeath, S. T.
    Menten, K. M.
    [J]. ASTRONOMY & ASTROPHYSICS, 2008, 481 (01) : 169 - 181
  • [3] THE STRUCTURE AND EVOLUTION OF RADIATIVELY COOLING JETS
    BLONDIN, JM
    FRYXELL, BA
    KONIGL, A
    [J]. ASTROPHYSICAL JOURNAL, 1990, 360 (02) : 370 - 386
  • [4] Water masers accompanying OH and methanol masers in star formation regions
    Breen, S. L.
    Caswell, J. L.
    Ellingsen, S. P.
    Phillips, C. J.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 406 (03) : 1487 - 1532
  • [5] THE MASSIVE PROTOSTELLAR CLUSTER NGC 6334I AT 220 au RESOLUTION: DISCOVERY OF FURTHER MULTIPLICITY, DIVERSITY, AND A HOT MULTI-CORE
    Brogan, C. L.
    Hunter, T. R.
    Cyganowski, C. J.
    Chandler, C. J.
    Friesen, R.
    Indebetouw, R.
    [J]. ASTROPHYSICAL JOURNAL, 2016, 832 (02)
  • [6] MASER TIME VARIATIONS
    BURKE, BF
    GIUFFRIDA, TS
    HASCHICK, AD
    [J]. ASTROPHYSICAL JOURNAL, 1978, 226 (01) : L21 - L24
  • [7] Trigonometric distance and proper motions of H2Omaser bowshocks in AFGL 5142
    Burns, R. A.
    Handa, T.
    Imai, H.
    Nagayama, T.
    Omodaka, T.
    Hirota, T.
    Motogi, K.
    van Langevelde, H. J.
    Baan, W. A.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017, 467 (02) : 2367 - 2376
  • [8] H2O masers in a jet-driven bow shock: episodic ejection from a massive young stellar object
    Burns, R. A.
    Handa, T.
    Nagayama, T.
    Sunada, K.
    Omodaka, T.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, 460 (01) : 283 - 290
  • [9] Carotti, 2017, NATPH, V13, P276
  • [10] Magnetic fields from OH maser maps at 6035 and 6030 MHz at Galactic sites 351.417+0.645 and 353.410-0.360
    Caswell, J. L.
    Kramer, B. Hutawarakorn
    Reynolds, J. E.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2011, 414 (03) : 1914 - 1926