Detection of the Winds from the Exciting Sources of Shell H II Regions in NGC 6334

We present results of high-sensitivity, high-resolution, multifrequency VLA observations toward the star-forming complex NGC 6334. We find that the H II region NGC 6334E, previously described as spherical, has a shell-like morphology. An additional shell-like radio source, G351.02+0.65, is mapped at 330 MHz. Four radio sources in the NGC 6334 complex present shell-like morphology; their diameters vary from 0.12 to 3.5 pc. Compact radio sources are detected at the center of the shells of NGC 6334E and NGC 6334A. These compact sources are believed to be associated with the exciting stars and are probably tracing ionized stellar winds. This is the first time for any H II region that both the shell and the central object are detected simultaneously in the radio. Two compact radio sources are detected toward the NGC 6334I(N) molecular core. One of them lies within 0.″3 of the position of a bright Class II methanol maser, suggesting that the radio source is associated with a young embedded massive star. This is the first detection of a radio continuum source in the NGC 6334I(N) region.

[1]  L. Testi,et al.  The Density Structure of Highly Compact H II Regions , 2000 .

[2]  W. Danchi,et al.  Star formation in NGC 6334 I and I(N) , 2000 .

[3]  S. Megeath,et al.  The Detection of Outflows in the Infrared-quiet Molecular Core NGC 6334/I(North). , 1999, The Astrophysical journal.

[4]  K. Kraemer,et al.  Photodissociation Regions and H II Regions in NGC 6334 , 1999 .

[5]  Garry Robinson,et al.  Studies of ultracompact H ii regions — II. High-resolution radio continuum and methanol maser survey , 1998 .

[6]  R. Williams,et al.  Cometary and bipolar ultracompact H ii regions , 1998 .

[7]  V. Slysh,et al.  VLA Imaging of Class I Methanol Masers at 7 Millimeters with Angular Resolution ~0.″2 , 1998 .

[8]  Luis F. Rodríguez,et al.  Detection of 7 Millimeter Sources near Cometary H II Regions , 1997 .

[9]  J. Caswell,et al.  COINCIDENCE OF MASER EMISSION FROM OH AT 6.035 GHZ AND METHANOL AT 6.668 GHZ , 1997 .

[10]  A. Bolatto,et al.  A 2000 M☉ Rotating Molecular Disk around NGC 6334A , 1997 .

[11]  G. García-Segura,et al.  From Ultracompact to Extended H II Regions , 1996 .

[12]  K. Kraemer,et al.  Molecular Gas in the NGC 6334 Star Formation Region , 1996 .

[13]  U. Leeds,et al.  CLUMPY ULTRACOMPACT HII REGIONS : II. CORES, SPHERES AND SHELLS FROM SUBSONIC FLOWS , 1996, astro-ph/9603002.

[14]  M. Redman,et al.  Clumpy Ultra Compact HII Regions - Part One - Fully Supersonic Wind-Blown Models , 1995, astro-ph/9507070.

[15]  H. R. Dickel,et al.  Rotation and Outflow in Compact H II Regions: VLA Observations of the Molecular and Ionized Gas in NGC 6334A and NGC 6334F , 1995 .

[16]  J. Whiteoak,et al.  Ammonia Observations of NGC 6334 I(N) , 1995 .

[17]  K. Kraemer,et al.  Shock-excited NH3 (3, 3) masers in the NGC 6334 star-forming region , 1995 .

[18]  E. Greisen,et al.  The NRAO VLA Sky Survey , 1996 .

[19]  J. Mangum,et al.  Formaldehyde as a probe of physical conditions in dense molecular clouds , 1993 .

[20]  R. N. Manchester,et al.  Catalog of 558 pulsars , 1993 .

[21]  R. Norris,et al.  Methanol masers at 12 GHz. , 1993 .

[22]  J. Moran,et al.  The large scattering disk of NGC 6334B , 1990 .

[23]  D. Breitschwerdt,et al.  Turbulent mixing in wind-blown HII regions , 1994 .

[24]  F. R. Harnden,et al.  The Einstein X-ray Observatory Catalog of O-type stars , 1989 .

[25]  K. Menten,et al.  Observations of various methanol maser transitions toward the NGC 6334 region , 1989 .

[26]  E. Churchwell,et al.  Massive stars embedded in molecular clouds - Their population and distribution in the galaxy , 1989 .

[27]  E. Churchwell,et al.  The morphologies and physical properties of ultracompact H II regions , 1989 .

[28]  J. Moran,et al.  The bipolar H II region NGC 6334A , 1988 .

[29]  Ralph A. Gaume,et al.  A study of the ground-state hydroxyl maser emission associated with 11 regions of star formation , 1987 .

[30]  P. Harvey,et al.  A near-infrared study of the NGC 6334-IV region , 1987 .

[31]  W. Peters,et al.  Ammonia Mapping of the Southern Molecular Cloud NGC 6334 , 1987, Publications of the Astronomical Society of Australia.

[32]  G. Fazio,et al.  Multiband far-infrared observations of the NGC 6334 complex , 1986 .

[33]  P. Conti,et al.  Mass loss in O-type stars - Parameters which affect it , 1984 .

[34]  H. Matthews,et al.  Shell structure in ultracompact H II regions. , 1984 .

[35]  I. Gatley,et al.  Infrared observations of OB star formation in NGC 6334 , 1983 .

[36]  D. Gezari.  The remarkable 400 micron source NGC 6334/I/North/ , 1982 .

[37]  J. Moran,et al.  Radio sources in NGC 6334 , 1982 .

[38]  J. Bieging,et al.  Mass loss from very luminous OB stars and the Cygnus superbubble , 1981 .

[39]  J. Shull.  Stellar winds in molecular clouds , 1980 .

[40]  J. Moran,et al.  Water-vapor masers and star formation in NGC 6334 , 1979 .

[41]  Glenn E. Miller,et al.  The Initial mass function and stellar birthrate in the solar neighborhood , 1979 .

[42]  E. Wright,et al.  Evidence for a variable far-infrared source in NGC 6334 , 1979 .

[43]  D. Gezari,et al.  1.0 millimeter continuum map of cool sources in the NGC 6334 complex , 1978 .

[44]  R. Weaver,et al.  Interstellar bubbles. II - Structure and evolution , 1977 .

[45]  H. R. Dickel,et al.  The detailed structure of CO in molecular cloud complexes. I - NGC 6334 , 1977 .

[46]  J. Ostriker,et al.  The development of compact dust-bounded H II regions. I. Their relation to infrared objects and maser sources , 1977 .

[47]  M. Harwit,et al.  Infrared and Radio Appearance of Cocoon Stars , 1967 .