THE MILLIMETER ASTRONOMY LEGACY TEAM 90 GHz (MALT90) PILOT SURVEY

Foster, Jonathan B.; Jackson, James M.; Barnes, Peter J.; Barris, Elizabeth; Brooks, Kate; Cunningham, M. R.; Finn, Susanna C.; Fuller, G. A.; Longmore, S.; Mascoop, J. L.; Peretto, N.; Rathborne, Jill; Sanhueza, Patricio; Schüller, F.; Wyrowski, F.

doi:10.1088/0067-0049/197/2/25

Cited by 136 publications

(139 citation statements)

References 41 publications

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“…The 840 X-ray point sources (blue polygons show extraction apertures) have been removed to highlight diffuse X-ray emission. Locations of dense cloud coresfrom the MALT90 survey (Foster et al 2011) are marked by white circles.…”

Section: Ukidss Nir Photometrymentioning

confidence: 99%

“…As shown in Figure 4, no single cluster dominates the source distribution; instead the sources are generally concentrated near the IRDC filaments, as we found using FIA, with subclustering on smaller scales. The most prominent small subclusters visible in Figure 4 are all located in or near several compact, bright 24 μm nebulae or six dense molecular cores in the ACIS field cataloged by the MALT90 survey (Foster et al 2011). We compile basic properties of the MALT90 cores in Table 2.…”

Section: Spatial Distribution and Imprint Of Disk Evolutionmentioning

confidence: 99%

“…Properties of MALT90 Cores Within the M17 SWex ACIS Field (Foster et al 2011). b Dust temperatures, column densities, and masses were calculated using Herschel Hi-Gal data, as described in Hoq et al (2013).…”

Section: Tablementioning

confidence: 99%

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RAPID CIRCUMSTELLAR DISK EVOLUTION AND AN ACCELERATING STAR FORMATION RATE IN THE INFRARED DARK CLOUD M17 SWex

Povich

Townsley

Robitaille

et al. 2016

ApJ

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We present a catalog of 840 X-ray sources and first results from a 100 ks Chandra X-ray Observatory imaging study of the filamentary infrared (IR) dark cloud G014.225-00.506, which forms the central regions of a larger cloud complex known as the M17 southwest extension (M17 SWex). In addition to the rich population of protostars and young stellar objects with dusty circumstellar disks revealed by archival data from the Spitzer Space Telescope, we discover a population of X-ray-emitting, intermediate-mass pre-main-sequence stars that lack IR excess emission from circumstellar disks. We model the IR spectral energy distributions of this source population to measure its mass function and place new constraints on the destruction timescales for the inner dust disk for 2-8 M ☉ stars. We also place a lower limit on the star formation rate (SFR) and find that it is quite high (  M 0.007 M ☉ yr −1 ), equivalent to several Orion Nebula Clusters in G14.225-0.506 alone, and likely accelerating. The cloud complex has not produced a population of massive, O-type stars commensurate with its SFR. This absence of very massive (20 M ☉ ) stars suggests that either (1) M17 SWex is an example of a distributed mode of star formation that will produce a large OB association dominated by intermediate-mass stars but relatively few massive clusters, or (2) the massive cores are still in the process of accreting sufficient mass to form massive clusters hosting O stars.

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Section: Ukidss Nir Photometrymentioning

confidence: 99%

Section: Spatial Distribution and Imprint Of Disk Evolutionmentioning

confidence: 99%

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RAPID CIRCUMSTELLAR DISK EVOLUTION AND AN ACCELERATING STAR FORMATION RATE IN THE INFRARED DARK CLOUD M17 SWex

Povich

Townsley

Robitaille

et al. 2016

ApJ

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“…The Millimetre Astronomy Legacy Team 90 GHz (MALT90) Survey (Foster et al 2011, Jackson et al 2013 recently obtained small maps toward 2000 high-mass star forming clumps identified from the ATLASGAL compact source catalog (Contreras et al 2013). The survey was conducted using the 22 m Mopra telescope located in Australia, observing at 16 molecular lines simultaneously.…”

Section: Overviewmentioning

confidence: 99%

MALT90: tracing the chemistry and kinematics of molecular clumps within the central molecular zone

et al. 2013

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Abstract. The MALT90 survey targets more than 2000 high-mass star-forming clumps in the Galactic plane obtaining small maps around each of them, in 16 molecular lines at 90 GHz. By observing several thousand high-mass star forming clumps MALT90 aims to characterize their global chemical and physical evolution. Here we summarize the survey parameters and show examples of the MALT90 data toward three clumps in the central molecular zone.

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“…In this paper, we have analyzed 14 southern IRDCs using N2H + (1-0), HNC(1-0), HCO + (1-0), and HCN(1-0) molecular lines from the Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey (Foster et al 2011). N2H + , HNC, HCO + , and HCN are good tracers of dense gases.…”

Section: Introductionmentioning

confidence: 99%

A systemic study of 14 southern infrared dark clouds with N2H+, HNC, HCO+ and HCN lines

Liu

Wang

2013

Monthly Notices of the Royal Astronomical Society

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We have studied 14 southern infrared dark clouds (IRDCs) using the data taken from the Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey and the GLIMPSE and MIPSGAL mid-infrared survey of the inner Galaxy. The physical and chemical characteristics of the 14 IRDCs are investigated using N 2 H + (1-0), HNC(1-0), HCO + (1-0), and HCN(1-0) molecular lines. We find that the 14 IRDCs are in different evolutionary stages from the "starless" to the sources with an UCHII region. Three IRDCs are detected to have the star forming activities. The integrated intensity ratios I HCO + /HCN , I N2H + /HCN , and I HNC/HCN are all about 1.5, which is different from the previous measurements, suggesting that the integrated intensity ratios may be affected by the cloud environments. The integrated intensities of HNC, HCO + and HCN show a tight correlation for the 14 IRDCs, implying a close link to the chemical evolution of these three species in the IRDCs. The derived excitation temperature for each IRDC is less than 25 K. We estimate the abundances of the four molecules from 10 −11 to 10 −9 , and the average abundance ratios N HNC /N HCN = 1.47 ± 0.50, N HNC /N HCO + = 1.74 ± 0.22, N HCN /N HCO + = 1.21 ± 0.41.

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THE MILLIMETER ASTRONOMY LEGACY TEAM 90 GHz (MALT90) PILOT SURVEY

Cited by 136 publications

References 41 publications

RAPID CIRCUMSTELLAR DISK EVOLUTION AND AN ACCELERATING STAR FORMATION RATE IN THE INFRARED DARK CLOUD M17 SWex

RAPID CIRCUMSTELLAR DISK EVOLUTION AND AN ACCELERATING STAR FORMATION RATE IN THE INFRARED DARK CLOUD M17 SWex

MALT90: tracing the chemistry and kinematics of molecular clumps within the central molecular zone

A systemic study of 14 southern infrared dark clouds with N2H+, HNC, HCO+ and HCN lines

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