The mopra Southern galactic plane CO survey

Michael G. Burton, C. Braiding, C. Glueck, P. Goldsmith, J. Hawkes, D. J. Hollenbach, C. Kulesa, C. L. Martin, J. L. Pineda, G. Rowell, R. Simon, A. A. Stark, J. Stutzki, N. J H Tothill, J. S. Urquhart, Christopher K Walker, A. J. Walsh, M. Wolfire

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We present the first results from a new carbon monoxide (CO) survey of the southern Galactic plane being conducted with the Mopra radio telescope in Australia. The 12CO, 13CO, and C18O J = 1-0 lines are being mapped over the l = 305°-345° , b= ±0.5. portion of the fourth quadrant of the Galaxy, at 35 arcsec spatial and 0.1 km s -1 spectral resolution. The survey is being undertaken with two principal science objectives: (i) to determine where and how molecular clouds are forming in the Galaxy and (ii) to probe the connection between molecular clouds and the 'missing' gas inferred from gamma-ray observations.We describe the motivation for the survey, the instrumentation and observing techniques being applied, and the data reduction and analysis methodology. In this paper, we present the data from the first degree surveyed, l = 323°-324° , b= ±0.5°. We compare the data to the previous CO survey of this region and present metrics quantifying the performance being achieved; the rms sensitivity per 0.1 km s-1 velocity channel is ∼1.5 K for 12 CO and ∼0.7 K for the other lines.We also present some results from the region surveyed, including line fluxes, column densities, molecular masses, 12CO/13CO line ratios, and 12CO optical depths.We also examine how these quantities vary as a function of distance from the Sun when averaged over the 1 square degree survey area. Approximately 2 × 106 M of molecular gas is found along the G323 sightline, with an average H2 number density of n H2 ~ 1 cm-3 within the Solar circle. The CO data cubes will be made publicly available as they are published.

Original languageEnglish (US)
Article numbere044
JournalPublications of the Astronomical Society of Australia
Volume30
Issue number1
DOIs
StatePublished - 2013

Fingerprint

carbon monoxide
molecular clouds
galaxies
quadrants
radio telescopes
data reduction
molecular gases
spectral resolution
gas
optical thickness
optical depth
instrumentation
sun
probe
gamma rays
methodology
radio
probes
sensitivity
gases

Keywords

  • Galaxy: kinematics and dynamics
  • Galaxy: structure
  • ISM: clouds
  • ISM: molecules
  • radio lines: ISM
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Burton, M. G., Braiding, C., Glueck, C., Goldsmith, P., Hawkes, J., Hollenbach, D. J., ... Wolfire, M. (2013). The mopra Southern galactic plane CO survey. Publications of the Astronomical Society of Australia, 30(1), [e044]. https://doi.org/10.1017/pasa.2013.22

The mopra Southern galactic plane CO survey. / Burton, Michael G.; Braiding, C.; Glueck, C.; Goldsmith, P.; Hawkes, J.; Hollenbach, D. J.; Kulesa, C.; Martin, C. L.; Pineda, J. L.; Rowell, G.; Simon, R.; Stark, A. A.; Stutzki, J.; Tothill, N. J H; Urquhart, J. S.; Walker, Christopher K; Walsh, A. J.; Wolfire, M.

In: Publications of the Astronomical Society of Australia, Vol. 30, No. 1, e044, 2013.

Research output: Contribution to journalArticle

Burton, MG, Braiding, C, Glueck, C, Goldsmith, P, Hawkes, J, Hollenbach, DJ, Kulesa, C, Martin, CL, Pineda, JL, Rowell, G, Simon, R, Stark, AA, Stutzki, J, Tothill, NJH, Urquhart, JS, Walker, CK, Walsh, AJ & Wolfire, M 2013, 'The mopra Southern galactic plane CO survey', Publications of the Astronomical Society of Australia, vol. 30, no. 1, e044. https://doi.org/10.1017/pasa.2013.22
Burton MG, Braiding C, Glueck C, Goldsmith P, Hawkes J, Hollenbach DJ et al. The mopra Southern galactic plane CO survey. Publications of the Astronomical Society of Australia. 2013;30(1). e044. https://doi.org/10.1017/pasa.2013.22
Burton, Michael G. ; Braiding, C. ; Glueck, C. ; Goldsmith, P. ; Hawkes, J. ; Hollenbach, D. J. ; Kulesa, C. ; Martin, C. L. ; Pineda, J. L. ; Rowell, G. ; Simon, R. ; Stark, A. A. ; Stutzki, J. ; Tothill, N. J H ; Urquhart, J. S. ; Walker, Christopher K ; Walsh, A. J. ; Wolfire, M. / The mopra Southern galactic plane CO survey. In: Publications of the Astronomical Society of Australia. 2013 ; Vol. 30, No. 1.
@article{dba0384b25b14902a99a20420ee425f5,
title = "The mopra Southern galactic plane CO survey",
abstract = "We present the first results from a new carbon monoxide (CO) survey of the southern Galactic plane being conducted with the Mopra radio telescope in Australia. The 12CO, 13CO, and C18O J = 1-0 lines are being mapped over the l = 305°-345° , b= ±0.5. portion of the fourth quadrant of the Galaxy, at 35 arcsec spatial and 0.1 km s -1 spectral resolution. The survey is being undertaken with two principal science objectives: (i) to determine where and how molecular clouds are forming in the Galaxy and (ii) to probe the connection between molecular clouds and the 'missing' gas inferred from gamma-ray observations.We describe the motivation for the survey, the instrumentation and observing techniques being applied, and the data reduction and analysis methodology. In this paper, we present the data from the first degree surveyed, l = 323°-324° , b= ±0.5°. We compare the data to the previous CO survey of this region and present metrics quantifying the performance being achieved; the rms sensitivity per 0.1 km s-1 velocity channel is ∼1.5 K for 12 CO and ∼0.7 K for the other lines.We also present some results from the region surveyed, including line fluxes, column densities, molecular masses, 12CO/13CO line ratios, and 12CO optical depths.We also examine how these quantities vary as a function of distance from the Sun when averaged over the 1 square degree survey area. Approximately 2 × 106 M⊙ of molecular gas is found along the G323 sightline, with an average H2 number density of n H2 ~ 1 cm-3 within the Solar circle. The CO data cubes will be made publicly available as they are published.",
keywords = "Galaxy: kinematics and dynamics, Galaxy: structure, ISM: clouds, ISM: molecules, radio lines: ISM, surveys",
author = "Burton, {Michael G.} and C. Braiding and C. Glueck and P. Goldsmith and J. Hawkes and Hollenbach, {D. J.} and C. Kulesa and Martin, {C. L.} and Pineda, {J. L.} and G. Rowell and R. Simon and Stark, {A. A.} and J. Stutzki and Tothill, {N. J H} and Urquhart, {J. S.} and Walker, {Christopher K} and Walsh, {A. J.} and M. Wolfire",
year = "2013",
doi = "10.1017/pasa.2013.22",
language = "English (US)",
volume = "30",
journal = "Publications of the Astronomical Society of Australia",
issn = "1448-6083",
publisher = "Cambridge University Press",
number = "1",

}

TY - JOUR

T1 - The mopra Southern galactic plane CO survey

AU - Burton, Michael G.

AU - Braiding, C.

AU - Glueck, C.

AU - Goldsmith, P.

AU - Hawkes, J.

AU - Hollenbach, D. J.

AU - Kulesa, C.

AU - Martin, C. L.

AU - Pineda, J. L.

AU - Rowell, G.

AU - Simon, R.

AU - Stark, A. A.

AU - Stutzki, J.

AU - Tothill, N. J H

AU - Urquhart, J. S.

AU - Walker, Christopher K

AU - Walsh, A. J.

AU - Wolfire, M.

PY - 2013

Y1 - 2013

N2 - We present the first results from a new carbon monoxide (CO) survey of the southern Galactic plane being conducted with the Mopra radio telescope in Australia. The 12CO, 13CO, and C18O J = 1-0 lines are being mapped over the l = 305°-345° , b= ±0.5. portion of the fourth quadrant of the Galaxy, at 35 arcsec spatial and 0.1 km s -1 spectral resolution. The survey is being undertaken with two principal science objectives: (i) to determine where and how molecular clouds are forming in the Galaxy and (ii) to probe the connection between molecular clouds and the 'missing' gas inferred from gamma-ray observations.We describe the motivation for the survey, the instrumentation and observing techniques being applied, and the data reduction and analysis methodology. In this paper, we present the data from the first degree surveyed, l = 323°-324° , b= ±0.5°. We compare the data to the previous CO survey of this region and present metrics quantifying the performance being achieved; the rms sensitivity per 0.1 km s-1 velocity channel is ∼1.5 K for 12 CO and ∼0.7 K for the other lines.We also present some results from the region surveyed, including line fluxes, column densities, molecular masses, 12CO/13CO line ratios, and 12CO optical depths.We also examine how these quantities vary as a function of distance from the Sun when averaged over the 1 square degree survey area. Approximately 2 × 106 M⊙ of molecular gas is found along the G323 sightline, with an average H2 number density of n H2 ~ 1 cm-3 within the Solar circle. The CO data cubes will be made publicly available as they are published.

AB - We present the first results from a new carbon monoxide (CO) survey of the southern Galactic plane being conducted with the Mopra radio telescope in Australia. The 12CO, 13CO, and C18O J = 1-0 lines are being mapped over the l = 305°-345° , b= ±0.5. portion of the fourth quadrant of the Galaxy, at 35 arcsec spatial and 0.1 km s -1 spectral resolution. The survey is being undertaken with two principal science objectives: (i) to determine where and how molecular clouds are forming in the Galaxy and (ii) to probe the connection between molecular clouds and the 'missing' gas inferred from gamma-ray observations.We describe the motivation for the survey, the instrumentation and observing techniques being applied, and the data reduction and analysis methodology. In this paper, we present the data from the first degree surveyed, l = 323°-324° , b= ±0.5°. We compare the data to the previous CO survey of this region and present metrics quantifying the performance being achieved; the rms sensitivity per 0.1 km s-1 velocity channel is ∼1.5 K for 12 CO and ∼0.7 K for the other lines.We also present some results from the region surveyed, including line fluxes, column densities, molecular masses, 12CO/13CO line ratios, and 12CO optical depths.We also examine how these quantities vary as a function of distance from the Sun when averaged over the 1 square degree survey area. Approximately 2 × 106 M⊙ of molecular gas is found along the G323 sightline, with an average H2 number density of n H2 ~ 1 cm-3 within the Solar circle. The CO data cubes will be made publicly available as they are published.

KW - Galaxy: kinematics and dynamics

KW - Galaxy: structure

KW - ISM: clouds

KW - ISM: molecules

KW - radio lines: ISM

KW - surveys

UR - http://www.scopus.com/inward/record.url?scp=84893566398&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84893566398&partnerID=8YFLogxK

U2 - 10.1017/pasa.2013.22

DO - 10.1017/pasa.2013.22

M3 - Article

AN - SCOPUS:84893566398

VL - 30

JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

SN - 1448-6083

IS - 1

M1 - e044

ER -