New ammonia masers towards NGC 6334I

A. J. Walsh; S. N. Longmore; S. Thorwirth; J. S. Urquhart; C. R. Purcell

doi:10.1111/j.1745-3933.2007.00384.x

New ammonia masers towards NGC 6334I

A. J. Walsh^*, S. N. Longmore, S. Thorwirth, J. S. Urquhart, C. R. Purcell

^*Corresponding author for this work

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

18 Citations (Scopus)

Abstract

We report the detection of new ammonia masers in the non-metastable (8,6) and (11,9) transitions towards the massive star-forming region NGC 6334I. Observations were made with the Australia Telescope Compact Array interferometer and the emitting region appears unresolved in the 2.7 × 0.8 arcsec² beam, with deconvolved sizes less than an arcsecond. We estimate peak brightness temperatures of 7.8 × 10⁵ and l.2 × 10⁵ K for the (8,6) and (11,9) transitions, respectively. The masers appear coincident both spatially and in velocity with a previously detected ammonia (6,6) maser. We also suggest that emission in the (10,9), (9,9) and (7,6) transitions may also be masers, based on the small linewidths and overlapping velocity ranges with the above masers, as observed with the single-dish Mopra radio telescope.

Original language	English
Pages (from-to)	L35–L38
Number of pages	4
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	382
Issue number	1
DOIs	https://doi.org/10.1111/j.1745-3933.2007.00384.x
Publication status	Published - Nov 2007
Externally published	Yes

Keywords

ISM: molecules
Masers
Stars: formation
Techniques: high angular resolution

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10.1111/j.1745-3933.2007.00384.x

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@article{e1ea28c5c5594af0a0d6c7f0ef2ecde6,

title = "New ammonia masers towards NGC 6334I",

abstract = "We report the detection of new ammonia masers in the non-metastable (8,6) and (11,9) transitions towards the massive star-forming region NGC 6334I. Observations were made with the Australia Telescope Compact Array interferometer and the emitting region appears unresolved in the 2.7 × 0.8 arcsec2 beam, with deconvolved sizes less than an arcsecond. We estimate peak brightness temperatures of 7.8 × 105 and l.2 × 105 K for the (8,6) and (11,9) transitions, respectively. The masers appear coincident both spatially and in velocity with a previously detected ammonia (6,6) maser. We also suggest that emission in the (10,9), (9,9) and (7,6) transitions may also be masers, based on the small linewidths and overlapping velocity ranges with the above masers, as observed with the single-dish Mopra radio telescope.",

keywords = "ISM: molecules, Masers, Stars: formation, Techniques: high angular resolution",

author = "Walsh, {A. J.} and Longmore, {S. N.} and S. Thorwirth and Urquhart, {J. S.} and Purcell, {C. R.}",

year = "2007",

month = nov,

doi = "10.1111/j.1745-3933.2007.00384.x",

language = "English",

volume = "382",

pages = "L35–L38",

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

issn = "1745-3925",

publisher = "Oxford University Press",

number = "1",

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TY - JOUR

T1 - New ammonia masers towards NGC 6334I

AU - Walsh, A. J.

AU - Longmore, S. N.

AU - Thorwirth, S.

AU - Urquhart, J. S.

AU - Purcell, C. R.

PY - 2007/11

Y1 - 2007/11

N2 - We report the detection of new ammonia masers in the non-metastable (8,6) and (11,9) transitions towards the massive star-forming region NGC 6334I. Observations were made with the Australia Telescope Compact Array interferometer and the emitting region appears unresolved in the 2.7 × 0.8 arcsec2 beam, with deconvolved sizes less than an arcsecond. We estimate peak brightness temperatures of 7.8 × 105 and l.2 × 105 K for the (8,6) and (11,9) transitions, respectively. The masers appear coincident both spatially and in velocity with a previously detected ammonia (6,6) maser. We also suggest that emission in the (10,9), (9,9) and (7,6) transitions may also be masers, based on the small linewidths and overlapping velocity ranges with the above masers, as observed with the single-dish Mopra radio telescope.

AB - We report the detection of new ammonia masers in the non-metastable (8,6) and (11,9) transitions towards the massive star-forming region NGC 6334I. Observations were made with the Australia Telescope Compact Array interferometer and the emitting region appears unresolved in the 2.7 × 0.8 arcsec2 beam, with deconvolved sizes less than an arcsecond. We estimate peak brightness temperatures of 7.8 × 105 and l.2 × 105 K for the (8,6) and (11,9) transitions, respectively. The masers appear coincident both spatially and in velocity with a previously detected ammonia (6,6) maser. We also suggest that emission in the (10,9), (9,9) and (7,6) transitions may also be masers, based on the small linewidths and overlapping velocity ranges with the above masers, as observed with the single-dish Mopra radio telescope.

KW - ISM: molecules

KW - Masers

KW - Stars: formation

KW - Techniques: high angular resolution

UR - http://www.scopus.com/inward/record.url?scp=41449102709&partnerID=8YFLogxK

U2 - 10.1111/j.1745-3933.2007.00384.x

DO - 10.1111/j.1745-3933.2007.00384.x

M3 - Letter

AN - SCOPUS:41449102709

VL - 382

SP - L35–L38

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 1

ER -

New ammonia masers towards NGC 6334I

Abstract

Keywords

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