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MALT-45: A 7 mm survey of the southern Galaxy - I. Techniques and spectral line data | | Christopher H. Jordan
; Andrew J. Walsh
; Vicki Lowe
; Maxim A. Voronkov
; Simon P. Ellingsen
; Shari L. Breen
; Cormac R. Purcell
; Peter J. Barnes
; Michael G. Burton
; Maria R. Cunningham
; Tracey Hill
; James M. Jackson
; Steven N. Longmore
; Nicolas Peretto
; James S.Urquhart
; | | Date: |
27 Jan 2015 | | 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 ($l =
330 - 335$, $b = pm0.5$) for spectral lines in the 7 mm band (42-44 and 48-49
GHz), including $ ext{CS}$ $(1-0)$, class I $ ext{CH}_3 ext{OH}$ masers in
the $7(0,7)-6(1,6)$ $ ext{A}^{+}$ transition and $ ext{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 $ ext{CH}_3 ext{OH}$ masers, of which 58 are new
detections, along with many sites of thermal and maser $ ext{SiO}$ emission
and thermal $ ext{CS}$. We found that 35 class I $ ext{CH}_3 ext{OH}$ masers
were associated with the published locations of class II
$ ext{CH}_3 ext{OH}$, $ ext{H}_2 ext{O}$ and $ ext{OH}$ masers but 42 have
no known masers within 60 arcsec. We compared the MALT-45 $ ext{CS}$ with
$ ext{NH}_3$ (1,1) to reveal regions of $ ext{CS}$ depletion and high
opacity, as well as evolved star-forming regions with a high ratio of
$ ext{CS}$ to $ ext{NH}_3$. All $ ext{SiO}$ masers are new detections, and
appear to be associated with evolved stars from the $it{Spitzer}$ Galactic
Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE). Generally, within
$ ext{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 $v=1$. | | Source: | arXiv, 1501.6650 | | Services: | Forum | Review | PDF | Favorites | |
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