37 GHz METHANOL MASERS : HORSEMEN OF THE APOCALYPSE FOR THE CLASS II METHANOL MASER PHASE?

Ellingsen, S. P.; Breen, S. L.; Соболев, А. М.; Voronkov, Maxim; Caswell, J. L.; Lo, Nadia

doi:10.1088/0004-637x/742/2/109

Cited by 42 publications

(108 citation statements)

References 57 publications

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“…The line of best fit for the full sample and those sources associated with excited-state OH masers have the same slope within the errors (0.84 ± 0.03 and 0.91 ± 0.13 for the full sample and excited-state OH-associated sample, respectively). In similar comparisons, Ellingsen et al (2011) and Breen et al (2012b) found that rarer methanol maser transitions (at 107-and 37.7-GHz) Figure 7. Peak luminosity of the 12.2-GHz maser emission versus the peak luminosity of the 6.7-GHz maser emission (units of Jy kpc 2 ) for 12.2-GHz methanol masers detected in the longitude range 186 • (through the Galactic Centre) to 60 • (Breen et al 2012a(Breen et al ,b, 2014, plus the current paper; black dots).…”

Section: Associations With Excited-state Oh Masersmentioning

confidence: 56%

12.2-GHz methanol maser MMB follow-up catalogue – IV. Longitude range 20°–60°

Breen

Ellingsen

Caswell

et al. 2016

Mon. Not. R. Astron. Soc.

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This is the fourth and final instalment of a series of catalogues presenting 12.2-GHz methanol maser observations made towards each of the 6.7-GHz methanol masers detected in the Methanol Multibeam (MMB) survey. This final portion of the survey covers the 20 • -60 • longitude range, increasing the 12.2-GHz follow-up range to the full MMB coverage of 186 • ≥ l ≤ 60 • and |b| ≤ 2 • . Towards a total of 260 6.7-GHz MMB methanol masers (we were unable to observe five of the MMB sources in this longitude range) we detect 116 12.2-GHz masers counterparts, 64 of which were discovered in this survey. Including data from the literature, we find that there are 12.2-GHz methanol masers towards 47.1 per cent of the 6.7-GHz methanol masers in this portion of the Galaxy. Across the entire MMB survey range, we find a detection rate of 45.3 per cent. We find that the detection rate of 12.2-GHz methanol masers as a function of Galactic longitude is not uniform and there is an excess of masers with broad velocity ranges at longitudes near 30 • and 330 • . Comparing the occurrence of 12.2-GHz methanol masers with MMB-targeted CO observations has shown that those outflows associated with a 12.2-GHz source have a larger average dynamical time-scale than those associated with only 6.7-GHz methanol masers, supporting the notion that the 12.2-GHz masers are associated with a later phase of high-mass star formation.

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Section: Associations With Excited-state Oh Masersmentioning

confidence: 56%

12.2-GHz methanol maser MMB follow-up catalogue – IV. Longitude range 20°–60°

Breen

Ellingsen

Caswell

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Other, rarer, maser transitions also have a special role to play -signposting physical conditions that Email: Shari.Breen@sydney.edu.au are less commonly found, or, perhaps more likely, associated with short-lived evolutionary phases in the star formation process (e.g. Ellingsen et al 2011Ellingsen et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

The 6-GHz Multibeam Maser Survey – III. Comparison between the MMB and HOPS

Breen

Contreras

Ellingsen

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We have compared the occurrence of 6.7-GHz and 12.2-GHz methanol masers with 22-GHz water masers and 6035-MHz excited-state OH masers in the 100 square degree region of the southern Galactic plane common to the Methanol Multibeam (MMB) and H 2 O southern Galactic Plane surveys (HOPS). We find the most populous star formation species to be 6.7-GHz methanol, followed by water, then 12.2-GHz and, finally, excited-state OH masers. We present association statistics, flux density (and luminosity where appropriate) and velocity range distributions across the largest, fully surveyed portion of the Galactic plane for four of the most common types of masers found in the vicinity of star formation regions.Comparison of the occurrence of the four maser types with far-infrared dust temperatures shows that sources exhibiting excited-state OH maser emission are warmer than sources showing any of the other three maser types. We further find that sources exhibiting both 6.7-GHz and 12.2-GHz methanol masers are warmer than sources exhibiting just 6.7-GHz methanol maser emission. These findings are consistent with previously made suggestions that both OH and 12.2-GHz methanol masers generally trace a later stage of star formation compared to other common maser types.

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“…Recent studies of methanol and water masers have further refined and quantified the maser-based timeline (e.g. Breen et al 2010aBreen et al , 2010bEllingsen et al 2011). The sensitive GASKAP study represents a unique opportunity to robustly test and refine the way that ground-state OH maser emission fits in the timeline.…”

Section: Dickey Et Almentioning

confidence: 99%

GASKAP—The Galactic ASKAP Survey

Dickey

McClure-Griffiths

Gibson

et al. 2013

Publ. Astron. Soc. Aust.

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A survey of the Milky Way disk and the Magellanic System at the wavelengths of the 21-cm atomic hydrogen (H i) line and three 18-cm lines of the OH molecule will be carried out with the Australian Square Kilometre Array Pathfinder * Hubble Fellow. telescope. The survey will study the distribution of H i emission and absorption with unprecedented angular and velocity resolution, as well as molecular line thermal emission, absorption, and maser lines. The area to be covered includes the Galactic plane (|b| < 10°) at all declinations south of δ = +40 • , spanning longitudes 167 • through 360 • to 79 • at b = 0 • , plus the entire area of the Magellanic Stream and Clouds, a total of 13 020 deg 2 . The brightness temperature sensitivity will be very good, typically σ T 1 K at resolution 30 arcsec and 1 km s −1 . The survey has a wide spectrum of scientific goals, from studies of galaxy evolution to star formation, with particular contributions to understanding stellar wind kinematics, the thermal phases of the interstellar medium, the interaction between gas in the disk and halo, and the dynamical and thermal states of gas at various positions along the Magellanic Stream.

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37 GHz METHANOL MASERS : HORSEMEN OF THE APOCALYPSE FOR THE CLASS II METHANOL MASER PHASE?

Cited by 42 publications

References 57 publications

12.2-GHz methanol maser MMB follow-up catalogue – IV. Longitude range 20°–60°

12.2-GHz methanol maser MMB follow-up catalogue – IV. Longitude range 20°–60°

The 6-GHz Multibeam Maser Survey – III. Comparison between the MMB and HOPS

GASKAP—The Galactic ASKAP Survey

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