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JOR15 - MALT-45: a 7 mm survey of the southern Galaxy - I. Techniques and spectral line data

Short title: Jordan et al. (2015)
Authors: Jordan, Christopher H. Walsh, Andrew J. Lowe, Vicki Voronkov, Maxim A. Ellingsen, Simon P. Breen, Shari L. Purcell, Cormac R. Barnes, Peter J. Burton, Michael G. Cunningham, Maria R. Hill, Tracey Jackson, James M. Longmore, Steven N. Peretto, Nicolas Urquhart, James S.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 448, Issue 3, p.2344-2361
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Abstract
We present the first results from the MALT-45 (Millimetre Astronomer's Legacy Team-45 GHz) Galactic Plane survey. We have observed 5 square degrees (l = 330°-335°, b = ±0.5°) for spectral lines in the 7 mm band (42-44 and 48-49 GHz), including CS (1-0), class I CH₃OH masers in the 7(0,7)-6(1,6) A⁺ transition and SiO (1-0) v = 0, 1, 2, 3. MALT-45 is the first unbiased, large-scale, sensitive spectral line survey in this frequency range. In this paper, we present data from the survey as well as a few intriguing results rigorous analyses of these science cases are reserved for future publications. Across the survey region, we detected 77 class I CH₃OH masers, of which 58 are new detections, along with many sites of thermal and maser SiO emission and thermal CS. We found that 35 class I CH₃OH masers were associated with the published locations of class II CH₃OH, H₂O and OH masers but 42 have no known masers within 60 arcsec. We compared the MALT-45 CS with NH₃ (1,1) to reveal regions of CS depletion and high opacity, as well as evolved star-forming regions with a high ratio of CS to NH₃. All SiO masers are new detections, and appear to be associated with evolved stars from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE). Generally, within SiO regions of multiple vibrational modes, the intensity decreases as v = 1, 2, 3, but there are a few exceptions where v = 2 is stronger than v = 1. eprintid: arXiv:1501.06650

Abstract

We present the first results from the MALT-45 (Millimetre Astronomer's Legacy Team-45 GHz) Galactic Plane survey. We have observed 5 square degrees (l = 330°-335°, b = ±0.5°) for spectral lines in the 7 mm band (42-44 and 48-49 GHz), including CS (1-0), class I CH₃OH masers in the 7(0,7)-6(1,6) A⁺ transition and SiO (1-0) v = 0, 1, 2, 3. MALT-45 is the first unbiased, large-scale, sensitive spectral line survey in this frequency range. In this paper, we present data from the survey as well as a few intriguing results rigorous analyses of these science cases are reserved for future publications. Across the survey region, we detected 77 class I CH₃OH masers, of which 58 are new detections, along with many sites of thermal and maser SiO emission and thermal CS. We found that 35 class I CH₃OH masers were associated with the published locations of class II CH₃OH, H₂O and OH masers but 42 have no known masers within 60 arcsec. We compared the MALT-45 CS with NH₃ (1,1) to reveal regions of CS depletion and high opacity, as well as evolved star-forming regions with a high ratio of CS to NH₃. All SiO masers are new detections, and appear to be associated with evolved stars from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE). Generally, within SiO regions of multiple vibrational modes, the intensity decreases as v = 1, 2, 3, but there are a few exceptions where v = 2 is stronger than v = 1. eprintid:

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IRAS source	IRAS coordinates (RA, Dec)	IRAS flux density (F12,F25,F60,F100)
2MASS source	2MASS coordinates (RA, Dec)	2MASS magnituted (J,H,K)

Variable star	Variable star parameters	Star Formation Region name	Star Formation Region parameters
WISE source	WISE coordinates (RA, Dec)	WISE magnitudes (w1, w2, w3, w4)
Akari IRC source	Akari IRC coordinates (RA, Dec)	Akari IRC fluxes (S09, S18)
Akari FIS source	Akari FIS coordinates (RA, Dec)	Akari FIS fluxes (S65, S90, S140, S160)

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DSS (optical)	2MASS (JHK)	WISE (4-22 um)	IRAC (3-8 um)	GLIMPSE 360 (3.6-4.5 um)	PACS color (70-160 um)	SPIRE color (250-500 um)
AKARI color (60-160 um)	NVSS (1.4 GHz)	SDSS (optical+NIR)	Image size: arcsec (default is 120 arcsec)
			Image size: arcsec (default is 120 arcsec)

Position of H₂O maser detection

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	NVSS (1.4GHz)
UKIDSS K	2MASS K

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JOR15 - MALT-45: a 7 mm survey of the southern Galaxy - I. Techniques and spectral line data

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Detection table from Jordan et al. (2015)