Search Results - "MacLeod, G C"

The Extraordinary Outburst in the Massive Protostellar System NGC 6334I-MM1: Emergence of Strong 6.7 GHz Methanol Masers by Hunter, T. R., Brogan, C. L., MacLeod, G. C., Cyganowski, C. J., Chibueze, J. O., Friesen, R., Hirota, T., Smits, D. P., Chandler, C. J., Indebetouw, R.

“…We report the first sub-arcsecond VLA imaging of 6 GHz continuum, methanol maser, and excited-state hydroxyl maser emission toward the massive protostellar…”
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The Extraordinary Outburst in the Massive Protostellar System NGC 6334I-MM1: Flaring of the Water Masers in a North-South Bipolar Outflow Driven by MM1B by Brogan, C. L., Hunter, T. R., Cyganowski, C. J., Chibueze, J. O., Friesen, R. K., Hirota, T., MacLeod, G. C., McGuire, B. A., Sobolev, A. M.

“…We compare multi-epoch sub-arcsecond Very Large Array imaging of the 22 GHz water masers toward the massive protocluster NGC 6334I observed before and after…”
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A Multitransition Methanol Maser Study of the Accretion Burst Source G358.93–0.03-MM1 by Bayandina, O. S., Brogan, C. L., Burns, R. A., Chen, X., Hunter, T. R., Kurtz, S. E., MacLeod, G. C., Sobolev, A. M., Sugiyama, K., Val’tts, I. E., Yonekura, Y.

“…Abstract We present the most complete to date interferometric study of the centimeter-wavelength methanol masers detected in G358.93−0.03 at the burst and…”
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Synchronized periodic maser flares of multiple OH and CH3OH lines in G323.459–0.079 by MacLeod, G C, Smits, Derck P, Green, J A, van den Heever, S P

“…ABSTRACT The first confirmed periodically varying 6.031 and 6.035 GHz hydroxyl masers are reported here. They vary contemporaneously with the 6.7 GHz methanol…”
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Powerful bursts of water masers towards G25.65+1.05 by Volvach, L N, Volvach, A E, Larionov, M G, MacLeod, G C, van den Heever, S P, Wolak, P, Olech, M

“…ABSTRACT The results of long-term monitoring of the Galactic 22.2 GHz water masers associated with G25.65+1.05 using several telescopes are presented. We…”
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Two periods instead of one in a single 6.7 GHz methanol maser feature in G9.62+0.20E by MacLeod, G C, Yonekura, Y, Tanabe, Y, Baan, W A, Brogan, C L, Burns, R A, Chibueze, J O, Houde, M, Hunter, T R, Kurtz, S E, Rajabi, F, Smits, D P, Stecklum, B, Sugiyama, K

“…ABSTRACT The source G9.62+0.20E surprises yet again! Analysis of the associated methanol maser feature at vlsr = +8.8 km s−1 revealed a second period of P =…”
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Periodic variability of the mainline hydroxyl masers in G9.62+0.20E by Goedhart, S, van Rooyen, R, van der Walt, D J, Maswanganye, J P, Sanna, A, MacLeod, G C, van den Heever, S P

“…Abstract We present the results of a monitoring campaign using the KAT-7 and HartRAO 26 m telescopes, of hydroxyl, methanol, and water vapour masers associated…”
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A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar by Burns, R. A., Sugiyama, K., Hirota, T., Kim, Kee-Tae, Sobolev, A. M., Stecklum, B., MacLeod, G. C., Yonekura, Y., Olech, M., Orosz, G., Ellingsen, S. P., Hyland, L., Caratti o Garatti, A., Brogan, C., Hunter, T. R., Phillips, C., van den Heever, S. P., Eislöffel, J., Linz, H., Surcis, G., Chibueze, J. O., Baan, W., Kramer, B.

“…High-mass stars are thought to accumulate much of their mass via short, infrequent bursts of disk-aided accretion 1 , 2 . Such accretion events are rare and…”
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A masing event in NGC 6334I: contemporaneous flaring of hydroxyl, methanol, and water masers by MacLeod, G C, Smits, D P, Goedhart, S, Hunter, T R, Brogan, C L, Chibueze, J O, van den Heever, S P, Thesner, C J, Banda, P J, Paulsen, J D

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Detection of new methanol maser transitions associated with G358.93−0.03 by MacLeod, G C, Sugiyama, K, Hunter, T R, Quick, J, Baan, W, Breen, S L, Brogan, C L, Burns, R A, Caratti o Garatti, A, Chen, X, Chibueze, J O, Houde, M, Kaczmarek, J F, Linz, H, Rajabi, F, Saito, Y, Schmidl, S, Sobolev, A M, Stecklum, B, van den Heever, S P, Yonekura, Y

“…ABSTRACT We report the detection of new 12.178, 12.229, 20.347, and 23.121 GHz methanol masers in the massive star-forming region G358.93−0.03, which are…”
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Identifying Zeeman pairs of hydroxyl masers in NGC 6334I-MM3 via velocity drift by MacLeod, G C, Smits, D P, Hunter, T R, Brogan, C, Chibueze, J O, van den Heever, S P

“…ABSTRACT A new tool to identify possible Zeeman pairs is presented here: the right circularly polarized (RCP) and left circularly polarized (LCP) components of…”
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Monitoring a methanol maser flare associated with the massive star-forming region G358.93–0.03 by Volvach, A E, Volvach, L N, Larionov, M G, MacLeod, G C, van den Heever, S P, Sugiyama, K

“…ABSTRACT We report the earliest detection of the 19.967-GHz [transition 21–30E (t = 0)] methanol maser associated with the massive star-forming region…”
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Modelling of the multitransition periodic flaring in G9.62+0.20E by Rajabi, F, Houde, M, MacLeod, G C, Goedhart, S, Tanabe, Y, van den Heever, S P, Wyenberg, C M, Yonekura, Y

“…ABSTRACT We present detailed modelling of periodic flaring events in the 6.7 GHz and 12.2 GHz methanol lines as well as the OH 1665 MHz and 1667 MHz…”
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Ammonia masers towards G 358.931−0.030 by McCarthy, T P, Breen, S L, Kaczmarek, J F, Chen, X, Parfenov, S, Sobolev, A M, Ellingsen, S P, Burns, R A, MacLeod, G C, Sugiyama, K, Brierley, A L, van den Heever, S P

“…ABSTRACT We report the detection of ammonia masers in the non-metastable (6, 3), (7, 5), and (6, 5) transitions; the latter being the first unambiguous maser…”
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Discovery of periodic methanol masers associated with G323.46−0.08 by Proven-Adzri, E, MacLeod, G C, Heever, S P van den, Hoare, M G, Kuditcher, A, Goedhart, S

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Massive protocluster of a periodic maser source G188.95+0.89 by Mutie, M M, Chibueze, J O, El Bouchefry, K, MacLeod, G C, Morgan, J, Baki, P

“…ABSTRACT We report the results of ongoing monitoring of the 6.7 GHz CH3OH masers associated with G188.95+0.89. In these observations, five features are…”
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Systematic velocity drifts of methanol masers associated with G9.62+0.20E by MacLeod, G C, Chibueze, J O, Sanna, A, Paulsen, J D, Houde, M, van den Heever, S P, Goedhart, S

“…ABSTRACT The source G9.62+0.20E surprises again! Several of the associated 6.7- and 12.2-GHz methanol masers are experiencing contemporaneous and systematic…”
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Improved selection criteria for H ii regions, based on IRAS sources by Yan, Qing-Zeng, Xu, Ye, Walsh, A J, Macquart, J P, MacLeod, G C, Zhang, Bo, Hancock, P J, Chen, Xi, Tang, Zheng-Hong

“…Abstract We present new criteria for selecting H ii regions from the Infrared Astronomical Satellite (IRAS) Point Source Catalogue (PSC), based on an H ii…”
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A Keplerian disk with a four-arm spiral birthing an episodically accreting high-mass protostar by Burns, R. A., Uno, Y., Sakai, N., Blanchard, J., Rosli, Z., Orosz, G., Yonekura, Y., Tanabe, Y., Sugiyama, K., Hirota, T., Kim, Kee-Tae, Aberfelds, A., Volvach, A. E., Bartkiewicz, A., Caratti o Garatti, A., Sobolev, A. M., Stecklum, B., Brogan, C., Phillips, C., Ladeyschikov, D. A., Johnstone, D., Surcis, G., MacLeod, G. C., Linz, H., Chibueze, J. O., Brand, J., Eislöffel, J., Hyland, L., Uscanga, L., Olech, M., Durjasz, M., Bayandina, O., Breen, S., Ellingsen, S. P., van den Heever, S. P., Hunter, T. R., Chen, X.

“…High-mass protostars ( M ⋆  > 8 M ⊙ ) are thought to gain the majority of their mass via short, intense bursts of growth. This episodic accretion is thought to…”
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Detection of Methanol Maser Flares Near 19.9 and 20.9 GHz toward the Massive Source of Active Star Formation G358.931-0.030 by Volvach, A. E., Volvach, L. N., Larionov, M. G., MacLeod, G. C.

“…We have investigated the methanol CH 3 OH lines at frequencies of 19.967 GHz [2 1 -3 0 E( v t = 0) transition] and 20.971 GHz [10 1 - 11 2 E + ( v t = 1)…”
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