The ALMA Survey of 70um dark High-mass clumps in Early Stages (ASHES). I. Pilot survey clump fragmentation. (2019)
Keywords :
Infrared dark clouds; Dust continuum emission; Star-forming regions; Massive stars; Star formation
Abstract:The ALMA Survey of 70{mu}m dark High-mass clumps in Early Stages (ASHES) is designed to systematically characterize the earliest stages and constrain theories of high-mass star formation. Twelve massive (>500M_{sun}_), cold (<=15K), 3.6-70{mu}m dark prestellar clump candidates, embedded in infrared dark clouds, were carefully selected in the pilot survey to be observed with the Atacama Large Millimeter/submillimeter Array (ALMA). We have mosaicked each clump (~1arcmin^2^) in continuum and line emission with the 12m, 7m, and Total Power (TP) arrays at 224GHz (1.34mm), resulting in ~1.2" resolution (~4800au, at the average source distance). As the first paper in the series, we concentrate on the continuum emission to
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For the ALMA Survey of 70{mu}m dark High-mass clumps in Early Stages
(ASHES) pilot survey, 11 infrared dark cloud (IRDC) clumps were
selected from the Millimetre Astronomy Legacy Team 90GHz Survey
(MALT90; Foster+ 2011, J/ApJS/197/25 and 2013PASA...30...38F ;
Jackson+ 2013PASA...30...57J). MALT90 was built on the ATLASGAL 870um
catalogs (Schuller+ 2009A&A...504..415S and Contreras+ 2013,
J/A+A/549/A45), from which a sample of 3246 high-mass clumps was
selected for follow-up in 16 spectral lines. Only 18 sources satisfy
all the selection conditions, and 11 were observed in this pilot
survey. The 12th target in the ASHES pilot survey is G028.273-00.167,
which is in the first quadrant and was not covered in MALT90. This
IRDC satisfies all requirements and has been well studied in the past
by Sanhueza+ (2012, J/ApJ/756/60 ; 2013ApJ...773..123S and
2017ApJ...841...97S).
Observations of the 12 IRDCs were carried out with ALMA on different
days during Cycle 3 (Project ID: 2015.1.01539.S; PI: Sanhueza) and a
resubmission for Cycle 4 (Project ID: 2016.1.01246.S; PI: Sanhueza).
The data sets consist of observations in band 6 (~224GHz; 1.34mm) with
the main 12m array, the Atacama Compact 7m Array (ACA; Morita Array),
and the total power (TP).
- J/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)
- J/A+A/430/137 : Close visual companions in Scorpius OB2 (Kouwenhoven+, 2005)
- J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)
- J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)
- J/ApJ/651/L125 : H2O masers associated with IR dark cloud cores (Wang+, 2006)
- J/A+A/462/L17 : Dense cores in interstellar molecular clouds (Alves+, 2007)
- J/A+A/505/405 : A catalogue of Spitzer dark clouds (Peretto+, 2009)
- J/ApJS/197/25 : MALT90 pilot survey (Foster+, 2011)
- J/A+A/530/A118 : G29.96-0.02 and G35.20-1.74 1mm and 3mm maps (Pillai+, 2011)
- J/MNRAS/424/1925 : Spectrocopic Binarity of O and B type stars (Chini+, 2012)
- J/ApJ/756/60 : A 3mm line survey in 37 IR dark clouds (Sanhueza+, 2012)
- J/A+A/544/A146 : ATLASGAL cold high-mass clumps with NH_3_ (Wienen+, 2012)
- J/A+A/549/A45 : ATLASGAL Compact Source Catalog
- J/ApJ/777/157 : 90GHz obs. of high-mass star-forming regions (Hoq+, 2013)
- J/ApJS/209/2 : The BGPS. X. Dense molecular gas (Shirley+, 2013)
- J/MNRAS/443/1555 : ATLASGAL massive star forming clump sample (Urquhart+, 2014)
- J/ApJ/780/85 : Molecular line study of IR dark clouds (Vasyunina+, 2014)
- J/A+A/565/A75 : ATLASGAL
- J/A+A/568/A41 : ATLASGAL Compact Source Catalog
- J/A+A/577/A30 : SDC335.579-0.292 6, 8, 23 and 25GHz images (Avison+, 2015)
- J/A+A/581/A119 : Starless gas clump IRDC 18310-4 images (Beuther+, 2015)
- J/ApJ/815/130 : High-mass molecular clumps from MALT90 (Guzman+, 2015)
- J/MNRAS/450/1926 : Infall motions in massive star-forming regions (He+, 2015)
- J/A+A/584/A91 : Cat. of dense cores in Aquila from Herschel (Konyves+, 2015)
- J/MNRAS/451/3089 : Young clumps embedded in IRDC (Traficante+, 2015)
- J/A+A/579/A91 : ATLASGAL Galaxy massive cold dust clumps (Wienen+, 2015)
- J/MNRAS/456/2041 : Fragmentation in filamentary mol. clouds (Contreras+ 2016)
- J/A+A/592/A21 : Are infrared dark clouds really quiescent? (Feng+, 2016)
- J/MNRAS/461/2288 : Infall motions in massive star-forming regions (He+, 2016)
- J/other/PASA/33.30 : MALT90 Catalogue (Rathborne+, 2016)
- J/ApJS/227/25 : 6 & 1.3cm deep VLA obs. toward high-mass SFRs (Rosero+, 2016)
- J/ApJ/824/29 : ATLASGAL clumps with IRAS & MALT90 data (Stephens+, 2016)
- J/A+A/599/A139 : ATLASGAL massive clumps dust characterization (Koenig+, 2017)
- J/A+A/600/L10 : Massive cluster progenitors from ATLASGAL (Csengeri+, 2017)
- J/AJ/154/140 : MALT90 kinematic dist. to molecular clumps (Whitaker+, 2017)
- J/A+A/617/A89 : G328.2551-0.5321 ALMA images (Csengeri+, 2018)
- J/A+A/615/A94 : ALMA massive protocluster gas clumps maps (Fontani+, 2018)
- J/ApJS/237/27 : Radio Ammonia Mid-plane Survey pilot survey (Hogge+, 2018)
- J/ApJ/867/94 : ALMA 1.3mm continuum flux data of C1-S core (Kong+, 2018)
- J/ApJ/862/105 : Core mass function across Gal. env. II. (Liu+, 2018)
- J/ApJS/243/13 : Massive star-forming clump from MALT90 (Li+, 2019)
- J/A+A/622/A99 : Starless MDCs of NGC6334 molecular spectra (Louvet+, 2019)
