OB Star Formation Across the Galaxy

Bronfman, L.; Nyman, L. Å.; May, J.; Faundez, S.; López, Carlos A.

doi:10.1007/978-3-642-18902-9_38

Cited by 275 publications

(452 citation statements)

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“…This core was detected in our 12 mm study, where it was referred to as Core 1. Towards this northern most core is an IRAS source, IRAS 17589−2312 (Bronfman, Nyman & May 1996), and we adopt the IRAS nomenclature. The dense CS core seen here is likely part of a molecular bridge connecting down towards the peak of the HESS J1801−233 TeV emission seen in Fig.…”

Section: Specific Discussion Of Regionsmentioning

confidence: 99%

A 7 mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources

Nicholas¹,

Rowell²,

Burton³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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We present 7 mm Mopra observations of the dense molecular gas towards the W28 supernova remnant (SNR) field, following a previous 12 mm line survey of this region. These observations take advantage of the 7 mm beam size to probe the dense and disrupted gas in the region at ∼1 arcmin scales. Our observations are focused towards the north-eastern (NE) HESS J1801−233 and southern HESS J1800−240 B TeV gamma-ray sources, with slightly less observations towards HESS J1800−240 A and C. Using the CS (1-0) transition we reveal multiple regions of dense gas, n H 2 ∼ 10 5 cm −3 . We report the discovery of dense gas towards HESS J1800−240 C, at the site of a 1720 MHz OH maser. The NE molecular cloud is known to be disrupted; many 1720 MHz OH masers and broad CO line emission are detected at the rim of W28. Here, we reveal this shock interaction region contains generally extended clumpy CS, as well as clumpy SiO and CH 3 OH emission with broad line profiles. The full width at half maximum (FWHM) of the molecular lines extend up to 18 km s −1 on the W28 side of the NE cloud. The detection of SiO towards maser clumps OH C, D, E and F provides further evidence of the shocked conditions in the NE cloud. Several other lines associated with star formation are also detected towards the southern source, notably the energetic H II complex G5.89−0.39. The spatial match of dense gas with the TeV emission further supports the cosmic ray (CR) origin for the gamma-rays. We estimate the mass of several extended dense clouds within the field and predict the TeV flux from the dense cloud components. The predicted fluxes are of the order of 10 −14 to 10 −13 photons cm −2 s −1 , which should be detectable and possibly resolved by a future TeV instrument, such as the Cherenkov Telescope Array.

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Section: Specific Discussion Of Regionsmentioning

confidence: 99%

A 7 mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources

Nicholas¹,

Rowell²,

Burton³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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“…The source does not meet the additional flux criteria set by Hughes & MacLeod (1989), F 100 ≥ 80 Jy which was designed to help filter out reflection nebulae and extragalactic objects. The source was included in a CS (2-1) survey by Bronfman, Nyman, & May (1996) and a methanol maser survey by Lyder & Galt (1997), but in both cases no detections were made.…”

Section: Iras 02171+6058 = Kmjbmentioning

confidence: 99%

A Submillimeter View of Star Formation near the HiiRegion KR 140

Kerton

Martín

Johnstone

et al. 2001

ApJ

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We present the results of 450 and 850 µm continuum mapping of the H II region KR 140 using the SCUBA instrument on the JCMT. KR 140 is a small (5.7 pc diameter) H II region at a distance of 2.3±0.3 kpc. Five of the six IRAS point sources near KR 140 were mapped in this study. Our analysis shows that two of these IRAS sources are embedded late B type stars lying well outside the H II region, two are a part of the dust shell surrounding the H II region, and one is the combined emission from an ensemble of smaller sources unresolved by IRAS. We have discovered a number of relatively cold submillimeter sources not visible in the IRAS data, ranging in size from 0.2 to 0.7 pc and in mass from 0.5 to 130 M. The distribution of masses for all sources is well characterized by a power law N (> M) ∝ M −α with α = 0.5 ± 0.04, in agreement with the typical mass function for clumped structures of this scale in molecular clouds. Several of the submillimeter sources are found at the H II-molecular gas interface and have probably been formed as the result of the expansion of the H II region. Many of the submillimeter sources we detect are gravitationally bound and most of these follow a mass-size relationship expected for objects in virial equilibrium with non-thermal pressure support. Upon the loss of non-thermal support they could be sites of star formation. Along with the two B stars that we have identified as possible cluster members along with VES 735, we argue that five nearby highly-reddened stars are in a pre-main-sequence stage of evolution.

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“…1) emission, chosen from the CS (2 ! 1) survey of Bronfman et al (1996) of IRAS sources with IR colors typical of compact H ii regions. The 1.2 mm emission was mapped within regions of $15 0 ; 10 0 centered on the IRAS sources.…”

Section: Introductionmentioning

confidence: 99%

Discovery of Four New Massive and Dense Cold Cores

Garay

Faundez

Mardones

et al. 2004

ApJ

115

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We report the identification, from a 1.2 mm dust continuum emission survey toward massive star-forming regions, of four strong 1.2 mm sources without counterparts at mid-infrared (Midcourse Space Experiment [MSX ]) and far-infrared (IRAS) wavelengths. They have radii in the range 0.2-0.3 pc, dust temperatures 17 K, masses in the range 4 ; 10 2 2 ; 10 3 M , and densities of $2 ; 10 5 cm À3. We suggest that these objects are massive and dense cold cores that will eventually collapse to form high-mass stars.

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OB Star Formation Across the Galaxy

Cited by 275 publications

References 0 publications

A 7 mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources

A 7 mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources

A Submillimeter View of Star Formation near the HiiRegion KR 140

Discovery of Four New Massive and Dense Cold Cores

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