Pilot observations for malt-45: a Galactic plane survey at 7 mm

C. H. Jordan; A. J. Walsh; V. Lowe; N. Lo; C. R. Purcell; M. A. Voronkov; S. N. Longmore

doi:10.1093/mnras/sts350

Pilot observations for malt-45: a Galactic plane survey at 7 mm

C. H. Jordan^*, A. J. Walsh, V. Lowe, N. Lo, C. R. Purcell, M. A. Voronkov, S. N. Longmore

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We introduce the Millimetre Astronomer's Legacy Team - 45 GHz (MALT-45) Galactic plane survey and describe pilot survey results with the Australia Telescope Compact Array (ATCA). The pilot survey was conducted to test the instrumentation and observational technique of MALT-45, before commencing the full survey. We mapped two half-square degree regions within the southern Galactic plane around the G333 giant molecular cloud, using fast mosaic mapping. Using the new Compact Array Broad-band Backend on the ATCA, we were able to observe two 2048MHzspectral windows, centred on frequencies 43.2 and 48.2 GHz. Although only a coarse spectral resolution of around 7 km s^-1 was available to us, we detect widespread, extended emission in the CS (1-0) ground state transition.We also detect eight Class I CH₃OH masers at 44 GHz and three SiO masers in vibrationally excited (1-0) transitions. We also detect the H53α radio recombination line, non-vibrationally excited SiO (1-0) and emission in the CH₃OH 1₁-0₀ A⁺ line

Original language	English
Pages (from-to)	469-481
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	429
Issue number	1
DOIs	https://doi.org/10.1093/mnras/sts350
Publication status	Published - 2013
Externally published	Yes

Keywords

Galaxy: structure
Ism: molecules
Masers
Radio lines: Ism
Stars: formation
Surveys

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10.1093/mnras/sts350

Cite this

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title = "Pilot observations for malt-45: a Galactic plane survey at 7 mm",

abstract = "We introduce the Millimetre Astronomer's Legacy Team - 45 GHz (MALT-45) Galactic plane survey and describe pilot survey results with the Australia Telescope Compact Array (ATCA). The pilot survey was conducted to test the instrumentation and observational technique of MALT-45, before commencing the full survey. We mapped two half-square degree regions within the southern Galactic plane around the G333 giant molecular cloud, using fast mosaic mapping. Using the new Compact Array Broad-band Backend on the ATCA, we were able to observe two 2048MHzspectral windows, centred on frequencies 43.2 and 48.2 GHz. Although only a coarse spectral resolution of around 7 km s-1 was available to us, we detect widespread, extended emission in the CS (1-0) ground state transition.We also detect eight Class I CH3OH masers at 44 GHz and three SiO masers in vibrationally excited (1-0) transitions. We also detect the H53α radio recombination line, non-vibrationally excited SiO (1-0) and emission in the CH3OH 11-00 A+ line",

keywords = "Galaxy: structure, Ism: molecules, Masers, Radio lines: Ism, Stars: formation, Surveys",

author = "Jordan, {C. H.} and Walsh, {A. J.} and V. Lowe and N. Lo and Purcell, {C. R.} and Voronkov, {M. A.} and Longmore, {S. N.}",

year = "2013",

doi = "10.1093/mnras/sts350",

language = "English",

volume = "429",

pages = "469--481",

journal = "Monthly Notices of the Royal Astronomical Society",

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AU - Jordan, C. H.

AU - Walsh, A. J.

AU - Lowe, V.

AU - Lo, N.

AU - Purcell, C. R.

AU - Voronkov, M. A.

AU - Longmore, S. N.

PY - 2013

Y1 - 2013

N2 - We introduce the Millimetre Astronomer's Legacy Team - 45 GHz (MALT-45) Galactic plane survey and describe pilot survey results with the Australia Telescope Compact Array (ATCA). The pilot survey was conducted to test the instrumentation and observational technique of MALT-45, before commencing the full survey. We mapped two half-square degree regions within the southern Galactic plane around the G333 giant molecular cloud, using fast mosaic mapping. Using the new Compact Array Broad-band Backend on the ATCA, we were able to observe two 2048MHzspectral windows, centred on frequencies 43.2 and 48.2 GHz. Although only a coarse spectral resolution of around 7 km s-1 was available to us, we detect widespread, extended emission in the CS (1-0) ground state transition.We also detect eight Class I CH3OH masers at 44 GHz and three SiO masers in vibrationally excited (1-0) transitions. We also detect the H53α radio recombination line, non-vibrationally excited SiO (1-0) and emission in the CH3OH 11-00 A+ line

AB - We introduce the Millimetre Astronomer's Legacy Team - 45 GHz (MALT-45) Galactic plane survey and describe pilot survey results with the Australia Telescope Compact Array (ATCA). The pilot survey was conducted to test the instrumentation and observational technique of MALT-45, before commencing the full survey. We mapped two half-square degree regions within the southern Galactic plane around the G333 giant molecular cloud, using fast mosaic mapping. Using the new Compact Array Broad-band Backend on the ATCA, we were able to observe two 2048MHzspectral windows, centred on frequencies 43.2 and 48.2 GHz. Although only a coarse spectral resolution of around 7 km s-1 was available to us, we detect widespread, extended emission in the CS (1-0) ground state transition.We also detect eight Class I CH3OH masers at 44 GHz and three SiO masers in vibrationally excited (1-0) transitions. We also detect the H53α radio recombination line, non-vibrationally excited SiO (1-0) and emission in the CH3OH 11-00 A+ line

KW - Galaxy: structure

KW - Ism: molecules

KW - Masers

KW - Radio lines: Ism

KW - Stars: formation

KW - Surveys

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DO - 10.1093/mnras/sts350

M3 - Article

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SN - 0035-8711

VL - 429

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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Pilot observations for malt-45: a Galactic plane survey at 7 mm

Abstract

Keywords

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