The Three-mm Ultimate Mopra Milky Way Survey. II. Cloud and Star Formation Near the Filamentary Ministarburst RCW 106

Abstract

We report here a study of gas, dust and star formation rates (SFRs) in the molecular cloud complexes (MCCs) surrounding the giant H$\mathrm{II}$ region RCW106 using ${}^{12}$CO and ${}^{13}$CO(1-0) data from the Three-mm Ultimate Mopra Milky way Survey (ThrUMMS) and archival data. We separate the emission in the Galactic Plane around $l=330^{\circ }$-$335^{\circ }$ and $b=-1^{\circ }$-$1^{\circ }$ into two main MCCs: the RCW106 (V${}_{\mathrm{LSR}}=-48$kms${}^{-1}$) complex and the MCC331-90(V${}_{\mathrm{LSR}}=-90$kms${}^{-1}$) complex. While RCW106 (M$\sim 5.9\times 10^6$M${}_{\odot }$) is located in the Scutum-Centaurus arm at a distance of 3.6kpc, MCC331-90 (M$\sim 2.8\times 10^6$M${}_{\odot }$) is in the Norma arm at a distance of 5kpc. Their molecular gas mass surface densities are $\sim 220$ and $\sim 130$M${}_{\odot }$ pc${}^{-2}$, respectively. For RCW106 complex, using the 21cm continuum fluxes and dense clump counting, we obtain an immediate past ($\sim$-0.2Myr) and an immediate future ($\sim$+0.2Myr) SFRs of $0.25_{-0.023}^{+0.09}$M${}_{\odot },{\mathrm{yr}}^{-1}$ and $0.12\pm 0.1$M${}_{\odot }{\mathrm{yr}}^{-1}$. This results in an immediate past SFR density of $9.5_{-0.9}^{+3.4}$M${}_{\odot }{\mathrm{yr}}^{-1}{\mathrm{kpc}}^{-2}$ and an immediate future SFR density of $4.8_{-3.8}^{+3.8}$M${}_{\odot }{\mathrm{yr}}^{-1}{\mathrm{kpc}}^{-2}$. As both SFRs in this cloud are higher than the ministarburst threshold, they must be undergoing a ministarburst event although burst peak has already passed. We conclude that this is one of the most active star forming complexes in the southern sky, ideal for further investigations of massive star formation and potentially shedding light on the physics of high-redshift starbursts.

17 pages, 11 figures, 3 tables, accepted for publication in ApJ

References in corpus (23)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• The earliest phases of high-mass star formation: a 3 square degree millimeter continuum mapping of Cygnus X
• The Dynamics of Radiation Pressure-Dominated HII Regions
• Kinematic Distances to Molecular Clouds identified in the Galactic Ring Survey
• Intrinsically Red Sources observed by Spitzer in the Galactic Mid-Plane
• The most massive stars in the Arches cluster
• Gas flow models in the Milky Way embedded bars
• Variations of the stellar initial mass function in the progenitors of massive early-type galaxies and in extreme starburst environments
• Intermediate to low-mass stellar content of Westerlund 1
• The RMS Survey: Radio observations of candidate massive YSOs in the southern hemisphere
• The Arches Cluster Mass Function
• The Three-mm Ultimate Mopra Milky Way Survey. I. Survey Overview, Initial Data Releases, and First Results
• The W43-MM1 mini-starburst ridge, a test for star formation efficiency models
• The formation of the W43 complex: constraining its atomic-to-molecular transition and searching for colliding clouds
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - III. Multi-molecular line mapping
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - II. Column density and dynamical state of the clumps
• A multi-wavelength view of the Galactic center dust ridge reveals little star formation
• Newly confirmed and high quality candidate Galactic SNRs uncovered from the AAO/UKST HAlpha survey
• Colliding Filaments and a Massive Dense Core in the Cygnus OB 7 Molecular Cloud
• Detection of SiO emission from a massive dense cold core
• Radio and infrared recombination studies of the southern massive star-forming region G333.6-0.2
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - IV. Ammonia towards dust emission

Cited by in corpus (13)

• The Three-mm Ultimate Mopra Milky Way Survey. I. Survey Overview, Initial Data Releases, and First Results
• Infall Signatures in a Prestellar Core embedded in the High-Mass 70 $\mu$m Dark IRDC G331.372-00.116
• Star formation towards the Galactic HII region RCW120
• The scaling relations and star formation laws of ministarburst complexes
• Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane
• The Massive Star-Forming Regions Omnibus X-Ray Catalog, Second Installment
• High-resolution APEX/LAsMA ${}^{12}$CO and ${}^{13}$CO (3-2) observation of the G333 giant molecular cloud complex : I. Evidence for gravitational acceleration in hub-filament systems
• Tracing Multi-Scale Magnetic Field Structure Using Multiple Chemical Tracers in Giant Molecular Clouds
• Wavelet-based cross-correlation analysis of structure scaling in turbulent clouds
• High-resolution APEX/LAsMA ${}^{12}$CO and ${}^{13}$CO (3-2) observation of the G333 giant molecular cloud complex : II. Survival and gravitational collapse of dense gas structures under feedback
• Searching for Magnetar Binaries Disrupted by Core-Collapse Supernovae
• Multiwavelength study of the G345.5+1.5 region
• Magnetic stability of massive star forming clumps in RCW 106