Zobrazeno 1 - 10
of 687
pro vyhledávání: '"MacLeod G"'
Autor:
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., Garatti, A. Caratti o, 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., Heever, S. P. van den, Hunter, T. R., Chen, X.
High-mass protostars (M$_{\star} >$ 8 M$_{\odot}$) are thought to gain the majority of their mass via short, intense bursts of growth. This episodic accretion is thought to be facilitated by gravitationally unstable and subsequently inhomogeneous acc
Externí odkaz:
http://arxiv.org/abs/2304.14740
Autor:
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., Garatti, A. Caratti o, Brogan, C., Hunter, T. R., Phillips, C., Heever, S. P. van den, 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. Such accretion events are rare and difficult to observe directly but are known to drive enhanced maser emission. In this Letter we repo
Externí odkaz:
http://arxiv.org/abs/2304.14739
Autor:
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., Heever, S. P. van den
We report the detection of ammonia masers in the non-metastable (6, 3), (7, 5) and (6, 5) transitions, the latter is the first unambiguous maser detection of that transition ever made. Our observations include the first VLBI detection of ammonia mase
Externí odkaz:
http://arxiv.org/abs/2304.13222
Autor:
Rajabi, F., Houde, M., MacLeod, G. C., Goedhart, S., Tanabe, Y., Heever, S. P. van den, Wyenberg, C. M., Yonekura, Y.
We present detailed modeling 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 transitions observed in the G9.62+0.20E star-forming region. Our analysis is performed within the framework of
Externí odkaz:
http://arxiv.org/abs/2303.08793
Autor:
Bayandina, O. S., Brogan, C. L., Burns, R. A., Garatti, A. Caratti o, Chibueze, J. O., Heever, S. P. van den, Kurtz, S. E., MacLeod, G. C., Moscadelli, L., Sobolev, A. M., Sugiyama, K., Val'tts, I. E., Yonekura, Y.
Publikováno v:
A&A 664, A44 (2022)
The massive young stellar object (MYSO) G358.93-0.03-MM1 showed an extraordinary near-infrared- to (sub-)millimetre-dark and far-infrared-loud accretion burst, which is closely associated with flares of several class II methanol maser transitions, an
Externí odkaz:
http://arxiv.org/abs/2206.12119
Autor:
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.
Publikováno v:
The Astronomical Journal, 163:83 (16pp), 2022 February
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 post-burst epochs. A unique, NIR/(sub)mm-dark and FIR-loud MYSO accretion burst was recently discovered
Externí odkaz:
http://arxiv.org/abs/2201.12075
We report the results of ongoing monitoring of the 6.7 GHz CH$_3$OH masers associated with G188.95+0.89. In these observations five features are periodically varying and at least two exhibit evidence of velocity drifts. It is not clear the cause of t
Externí odkaz:
http://arxiv.org/abs/2107.05743
Autor:
Hunter, T. R., Brogan, C. L., De Buizer, J. M., Towner, A. P. M., Dowell, C. D., MacLeod, G. C., Stecklum, B., Cyganowski, C. J., El-Abd, S. J., McGuire, B. A.
In recent years, dramatic outbursts have been identified toward massive protostars via infrared and millimeter dust continuum and molecular maser emission. The longest lived outburst ($>6$ yr) persists in NGC6334I-MM1, a deeply-embedded object with n
Externí odkaz:
http://arxiv.org/abs/2104.05187
Autor:
Stecklum, B., Wolf, V., Linz, H., Garatti, A. Caratti o, Schmidl, S., Klose, S., Eislöffel, J., Fischer, Ch., Brogan, C., Burns, R., Bayandina, O., Cyganowski, C., Gurwell, M., Hunter, T., Hirano, N., Kim, K. -T., MacLeod, G., Menten, K. M., Olech, M., Orosz, G., Sobolev, A., Sridharan, T. K., Surcis, G., Sugiyama, K., van der Walt, J., Volvach, A., Yonekura, Y.
Publikováno v:
A&A 646, A161 (2021)
Class II methanol masers are signs of massive young stellar objects (MYSOs). Recent findings show that MYSO accretion bursts cause flares of these masers. Thus, maser monitoring can be used to identify such bursts. Burst-induced SED changes provide v
Externí odkaz:
http://arxiv.org/abs/2101.01812
Autor:
Burns, R. A., Orosz, G., Bayandina, O., Surcis, G., Olech, M., MacLeod, G., Volvach, A., Rudnitskii, G., Hirota, T., Immer, K., Blanchard, J., Marcote, B., van Langevelde, H. J., Chibueze, J. O., Sugiyama, K., Kim, Kee-Tae, Val`tts, I., Shakhvorostova, N., Kramer, B., Baan, W. A., Brogan, C., Hunter, T., Kurtz, S., Sobolev, A. M., Brand, J., Volvach, L.
This paper reports observations of a 22 GHz water maser `superburst' in the G25.65+1.05 massive star forming region, conducted in response to an alert from the Maser Monitoring Organisation (M2O). Very long baseline interferometry (VLBI) observations
Externí odkaz:
http://arxiv.org/abs/1911.12634