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Your search keyword '"COTTON, A. D."' showing total 36 results
Start Over Author "COTTON, A. D." Publisher edp sciences
36 results on '"COTTON, A. D."'

1. MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre.

Author

Bordiu, C., Filipović, M. D., Umana, G., Cotton, W. D., Buemi, C., Bufano, F., Camilo, F., Cavallaro, F., Cerrigone, L., Dai, S., Hopkins, A. M., Ingallinera, A., Jarrett, T., Koribalski, B., Lazarević, S., Leto, P., Loru, S., Lundqvist, P., Mackey, J., and Norris, R. P.

Subjects
CIRCUMSTELLAR matter, STELLAR winds, SUPERGIANT stars, MEERKAT, NICKNAMES
Abstract

We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed Kýklos (J1802–3353), with MeerKAT UHF and L-band observations. The radio ring, which resembles the recently discovered odd radio circles (ORCs), has a diameter of ∼80″ and is located just ∼6° from the Galactic plane. However, Kýklos exhibits an atypical thermal radio-continuum spectrum (α = −0.1 ± 0.3), which led us to explore different possible formation scenarios. We concluded that a circumstellar shell around an evolved massive star, possibly a Wolf-Rayet, is the most convincing explanation with the present data. [ABSTRACT FROM AUTHOR]

Published
2024
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2. A global view on star formation: The GLOSTAR Galactic plane survey. IX. Radio Source Catalog III: 2<28, 36<40, 56<60 and |b|<1, VLA B configuration

Author

Yang, A. Y., primary, Dzib, S. A., additional, Urquhart, J. S., additional, Brunthaler, A., additional, Medina, S.-N. X., additional, Menten, K. M., additional, Wyrowski, F., additional, Ortiz-León, G. N., additional, Cotton, W. D., additional, Gong, Y., additional, Dokara, R., additional, Rugel, M. R., additional, Beuther, H., additional, Pandian, J. D., additional, Csengeri, T., additional, Veena, V. S., additional, Roy, N., additional, Nguyen, H., additional, Winkel, B., additional, Ott, J., additional, Carrasco-Gonzalez, C., additional, Khan, S., additional, and Cheema, A., additional

Published
2023
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3. A global view on star formation: The GLOSTAR Galactic plane survey

Author

Gong, Y., primary, Ortiz-León, G. N., additional, Rugel, M. R., additional, Menten, K. M., additional, Brunthaler, A., additional, Wyrowski, F., additional, Henkel, C., additional, Beuther, H., additional, Dzib, S. A., additional, Urquhart, J. S., additional, Yang, A. Y., additional, Pandian, J. D., additional, Dokara, R., additional, Veena, V. S., additional, Nguyen, H., additional, Medina, S.-N. X., additional, Cotton, W. D., additional, Reich, W., additional, Winkel, B., additional, Müller, P., additional, Skretas, I., additional, Csengeri, T., additional, Khan, S., additional, and Cheema, A., additional

Published
2023
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4. A global view on star formation: The GLOSTAR Galactic plane survey

Author

Dokara, R., primary, Gong, Y., additional, Reich, W., additional, Rugel, M. R., additional, Brunthaler, A., additional, Menten, K. M., additional, Cotton, W. D., additional, Dzib, S. A., additional, Khan, S., additional, Medina, S.-N. X., additional, Nguyen, H., additional, Ortiz-León, G. N., additional, Urquhart, J. S., additional, Wyrowski, F., additional, Yang, A. Y., additional, Anderson, L. D., additional, Beuther, H., additional, Csengeri, T., additional, Müller, P., additional, Ott, J., additional, Pandian, J. D., additional, and Roy, N., additional

Published
2023
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5. A global view on star formation: The GLOSTAR Galactic plane survey

Author

Dzib, S. A., primary, Yang, A. Y., additional, Urquhart, J. S., additional, Medina, S.-N. X., additional, Brunthaler, A., additional, Menten, K. M., additional, Wyrowski, F., additional, Cotton, W. D., additional, Dokara, R., additional, Ortiz-León, G. N., additional, Rugel, M. R., additional, Nguyen, H., additional, Gong, Y., additional, Chakraborty, A., additional, Beuther, H., additional, Billington, S. J., additional, Carrasco-Gonzalez, C., additional, Csengeri, T., additional, Hofner, P., additional, Ott, J., additional, Pandian, J. D., additional, Roy, N., additional, and Yanza, V., additional

Published
2023
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6. A global view on star formation: The GLOSTAR Galactic plane survey

Author

Nguyen, H., primary, Rugel, M. R., additional, Murugeshan, C., additional, Menten, K. M., additional, Brunthaler, A., additional, Urquhart, J. S., additional, Dokara, R., additional, Dzib, S. A., additional, Gong, Y., additional, Khan, S., additional, Medina, S.-N. X., additional, Ortiz-León, G. N., additional, Reich, W., additional, Wyrowski, F., additional, Yang, A. Y., additional, Beuther, H., additional, Cotton, W. D., additional, and Pandian, J. D., additional

Published
2022
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7. Origin of the ring structures in Hercules A: Sub-arcsecond 144 MHz to 7 GHz observations

Author

European Commission, European Research Council, Ministerio de Ciencia e Innovación (España), Timmerman, R., van Weeren, R. J., Callingham, J. R., Cotton, W. D., Perley, R., Morabito, L. K., Gizani, N. A. B., Bridle, A. H., O'Dea, C.P., Baum, S. A., Tremblay, G. R., Kharb, P., Kassim, N. E., Röttgering, H. J. A., Botteon, A., Sweijen, F., Tasse, C., Brüggen, M., Moldón, Javier, Shimwell, T., Brunetti, G., European Commission, European Research Council, Ministerio de Ciencia e Innovación (España), Timmerman, R., van Weeren, R. J., Callingham, J. R., Cotton, W. D., Perley, R., Morabito, L. K., Gizani, N. A. B., Bridle, A. H., O'Dea, C.P., Baum, S. A., Tremblay, G. R., Kharb, P., Kassim, N. E., Röttgering, H. J. A., Botteon, A., Sweijen, F., Tasse, C., Brüggen, M., Moldón, Javier, Shimwell, T., and Brunetti, G.

Abstract

The prominent radio source Hercules A features complex structures in its radio lobes. Although it is one of the most comprehensively studied sources in the radio sky, the origin of the ring structures in the Hercules A radio lobes remains an open question. We present the first sub-arcsecond angular resolution images at low frequencies (<300 MHz) of Hercules A, made with the International LOFAR Telescope. With the addition of data from the Karl G. Jansky Very Large Array, we mapped the structure of the lobes from 144 MHz to 7 GHz. We explore the origin of the rings within the lobes of Hercules A, and test whether their properties are best described by a shock model, where shock waves are produced by the jet propagating in the radio lobe, or by an inner-lobe model, where the rings are formed by decelerated jetted plasma. From spectral index mapping our large frequency coverage reveals that the curvature of the different ring spectra increases with distance away from the central active galactic nucleus. We demonstrate that the spectral shape of the rings is consistent with synchrotron aging, which speaks in favor of an inner-lobe model where the rings are formed from the deposition of material from past periods of intermittent core activity. © R. Timmerman et al. 2022.

Published
2022

8. Origin of the ring structures in Hercules A

Author

Timmerman, R., primary, van Weeren, R. J., additional, Callingham, J. R., additional, Cotton, W. D., additional, Perley, R., additional, Morabito, L. K., additional, Gizani, N. A. B., additional, Bridle, A. H., additional, O’Dea, C. P., additional, Baum, S. A., additional, Tremblay, G. R., additional, Kharb, P., additional, Kassim, N. E., additional, Röttgering, H. J. A., additional, Botteon, A., additional, Sweijen, F., additional, Tasse, C., additional, Brüggen, M., additional, Moldon, J., additional, Shimwell, T., additional, and Brunetti, G., additional

Published
2022
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9. The MeerKAT Galaxy Cluster Legacy Survey

Author

Knowles, K., primary, Cotton, W. D., additional, Rudnick, L., additional, Camilo, F., additional, Goedhart, S., additional, Deane, R., additional, Ramatsoku, M., additional, Bietenholz, M. F., additional, Brüggen, M., additional, Button, C., additional, Chen, H., additional, Chibueze, J. O., additional, Clarke, T. E., additional, de Gasperin, F., additional, Ianjamasimanana, R., additional, Józsa, G. I. G., additional, Hilton, M., additional, Kesebonye, K. C., additional, Kolokythas, K., additional, Kraan-Korteweg, R. C., additional, Lawrie, G., additional, Lochner, M., additional, Loubser, S. I., additional, Marchegiani, P., additional, Mhlahlo, N., additional, Moodley, K., additional, Murphy, E., additional, Namumba, B., additional, Oozeer, N., additional, Parekh, V., additional, Pillay, D. S., additional, Passmoor, S. S., additional, Ramaila, A. J. T., additional, Ranchod, S., additional, Retana-Montenegro, E., additional, Sebokolodi, L., additional, Sikhosana, S. P., additional, Smirnov, O., additional, Thorat, K., additional, Venturi, T., additional, Abbott, T. D., additional, Adam, R. M., additional, Adams, G., additional, Aldera, M. A., additional, Bauermeister, E. F., additional, Bennett, T. G. H., additional, Bode, W. A., additional, Botha, D. H., additional, Botha, A. G., additional, Brederode, L. R. S., additional, Buchner, S., additional, Burger, J. P., additional, Cheetham, T., additional, de Villiers, D. I. L., additional, Dikgale-Mahlakoana, M. A., additional, du Toit, L. J., additional, Esterhuyse, S. W. P., additional, Fadana, G., additional, Fanaroff, B. L., additional, Fataar, S., additional, Foley, A. R., additional, Fourie, D. J., additional, Frank, B. S., additional, Gamatham, R. R. G., additional, Gatsi, T. G., additional, Geyer, M., additional, Gouws, M., additional, Gumede, S. C., additional, Heywood, I., additional, Hlakola, M. J., additional, Hokwana, A., additional, Hoosen, S. W., additional, Horn, D. M., additional, Horrell, J. M. G., additional, Hugo, B. V., additional, Isaacson, A. R., additional, Jonas, J. L., additional, Jordaan, J. D. B., additional, Joubert, A. F., additional, Julie, R. P. M., additional, Kapp, F. B., additional, Kasper, V. A., additional, Kenyon, J. S., additional, Kotzé, P. P. A., additional, Kotze, A. G., additional, Kriek, N., additional, Kriel, H., additional, Krishnan, V. K., additional, Kusel, T. W., additional, Legodi, L. S., additional, Lehmensiek, R., additional, Liebenberg, D., additional, Lord, R. T., additional, Lunsky, B. M., additional, Madisa, K., additional, Magnus, L. G., additional, Main, J. P. L., additional, Makhaba, A., additional, Makhathini, S., additional, Malan, J. A., additional, Manley, J. R., additional, Marais, S. J., additional, Maree, M. D. J., additional, Martens, A., additional, Mauch, T., additional, McAlpine, K., additional, Merry, B. C., additional, Millenaar, R. P., additional, Mokone, O. J., additional, Monama, T. E., additional, Mphego, M. C., additional, New, W. S., additional, Ngcebetsha, B., additional, Ngoasheng, K. J., additional, Ockards, M. T., additional, Otto, A. J., additional, Patel, A. A., additional, Peens-Hough, A., additional, Perkins, S. J., additional, Ramanujam, N. M., additional, Ramudzuli, Z. R., additional, Ratcliffe, S. M., additional, Renil, R., additional, Robyntjies, A., additional, Rust, A. N., additional, Salie, S., additional, Sambu, N., additional, Schollar, C. T. G., additional, Schwardt, L. C., additional, Schwartz, R. L., additional, Serylak, M., additional, Siebrits, R., additional, Sirothia, S. K., additional, Slabber, M., additional, Sofeya, L., additional, Taljaard, B., additional, Tasse, C., additional, Tiplady, A. J., additional, Toruvanda, O., additional, Twum, S. N., additional, van Balla, T. J., additional, van der Byl, A., additional, van der Merwe, C., additional, van Dyk, C. L., additional, Van Tonder, V., additional, Van Wyk, R., additional, Venter, A. J., additional, Venter, M., additional, Welz, M. G., additional, Williams, L. P., additional, and Xaia, B., additional

Published
2022
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10. A global view on star formation: The GLOSTAR Galactic plane survey

Author

Dokara, R., primary, Brunthaler, A., additional, Menten, K. M., additional, Dzib, S. A., additional, Reich, W., additional, Cotton, W. D., additional, Anderson, L. D., additional, Chen, C.-H. R., additional, Gong, Y., additional, Medina, S.-N. X., additional, Ortiz-León, G. N., additional, Rugel, M., additional, Urquhart, J. S., additional, Wyrowski, F., additional, Yang, A. Y., additional, Beuther, H., additional, Billington, S. J., additional, Csengeri, T., additional, Carrasco-González, C., additional, and Roy, N., additional

Published
2021
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11. A global view on star formation: The GLOSTAR Galactic plane survey

Author

Brunthaler, A., primary, Menten, K. M., additional, Dzib, S. A., additional, Cotton, W. D., additional, Wyrowski, F., additional, Dokara, R., additional, Gong, Y., additional, Medina, S.-N. X., additional, Müller, P., additional, Nguyen, H., additional, Ortiz-León, G. N., additional, Reich, W., additional, Rugel, M. R., additional, Urquhart, J. S., additional, Winkel, B., additional, Yang, A. Y., additional, Beuther, H., additional, Billington, S., additional, Carrasco-Gonzalez, C., additional, Csengeri, T., additional, Murugeshan, C., additional, Pandian, J. D., additional, and Roy, N., additional

Published
2021
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12. A global view on star formation: the GLOSTAR Galactic plane survey

Author

Ortiz-León, Gisela N., primary, Menten, Karl M., additional, Brunthaler, Andreas, additional, Csengeri, Timea, additional, Urquhart, James S., additional, Wyrowski, Friedrich, additional, Gong, Yan, additional, Rugel, Michael R., additional, Dzib, Sergio A., additional, Yang, Aiyuan, additional, Nguyen, Hans, additional, Cotton, William D., additional, Medina, Sac Nicté X., additional, Dokara, Rohit, additional, König, Carsten, additional, Beuther, Henrik, additional, Pandian, Jagadheep D., additional, Reich, Wolfgang, additional, and Roy, Nirupam, additional

Published
2021
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13. A global view on star formation: The GLOSTAR Galactic plane survey

Author

Nguyen, H., primary, Rugel, M. R., additional, Menten, K. M., additional, Brunthaler, A., additional, Dzib, S. A., additional, Yang, A. Y., additional, Kauffmann, J., additional, Pillai, T. G. S., additional, Nandakumar, G., additional, Schultheis, M., additional, Urquhart, J. S., additional, Dokara, R., additional, Gong, Y., additional, Medina, S-N. X., additional, Ortiz-León, G. N., additional, Reich, W., additional, Wyrowski, F., additional, Beuther, H., additional, Cotton, W. D., additional, Csengeri, T., additional, Pandian, J. D., additional, and Roy, N., additional

Published
2021
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14. A global view on star formation: the GLOSTAR Galactic plane survey III. 6.7 GHz methanol maser survey in Cygnus X

Author

Ortiz-León, Gisela N., Menten, Karl M., Brunthaler, Andreas, Csengeri, Timea, Urquhart, James S., Wyrowski, Friedrich, Gong, Yan, Rugel, Michael R., Dzib, Sergio A., Yang, Aiyuan, Nguyen, Hans, Cotton, William D., Medina, Sac Nicté X., Dokara, Rohit, König, Carsten, Beuther, Henrik, Pandian, Jagadheep D., Reich, Wolfgang, Roy, Nirupam, Ortiz-León, Gisela N., Menten, Karl M., Brunthaler, Andreas, Csengeri, Timea, Urquhart, James S., Wyrowski, Friedrich, Gong, Yan, Rugel, Michael R., Dzib, Sergio A., Yang, Aiyuan, Nguyen, Hans, Cotton, William D., Medina, Sac Nicté X., Dokara, Rohit, König, Carsten, Beuther, Henrik, Pandian, Jagadheep D., Reich, Wolfgang, and Roy, Nirupam

Abstract

The Cygnus X complex is covered by the Global View of Star Formation in the Milky Way (GLOSTAR) survey, an unbiased radio-wavelength Galactic plane survey, in 4–8 GHz continuum radiation and several spectral lines. The GLOSTAR survey observed the 6.7 GHz transition of methanol (CH\(_3\)OH), an exclusive tracer of high-mass young stellar objects. Using the Very Large Array in both the B and D configurations, we observed an area in Cygnus X of 7° × 3° in size and simultaneously covered the methanol line and the continuum, allowing cross-registration. We detected thirteen sources with Class II methanol maser emission and one source with methanol absorption. Two methanol maser sources are newly detected; in addition, we found four new velocity components associated with known masers. Five masers are concentrated in the DR21 ridge and W75N. We determined the characteristics of the detected masers and investigated the association with infrared, (sub)millimeter, and radio continuum emission. All maser sources are associated with (sub)millimeter dust continuum emission, which is consistent with the picture of masers tracing regions in an active stage of star formation. On the other hand, only five masers (38 ± 17%) have radio continuum counterparts seen with GLOSTAR within ~1″, testifying to their youth. Comparing the distributions of the bolometric luminosity and the luminosity-to-mass ratio of cores that host 6.7 GHz methanol masers with those of the full core population, we identified lower limits L\(_{Bol}\) ~ 200 L\(_⊙\) and L\(_{Bol}\)/M\(_{core}\) ~ 1 L\(_⊙\)M\(_⊙^{−1}\) for a dust source to host maser emission.

Published
2021

17. The Herschel Virgo Cluster Survey - VI. The far-infrared view of M 87 [Letter]

Author

Baes, Maarten, Clemens, M., Xilouris, E. M., Fritz, J., Cotton, W. D., Davies, Jonathan Ivor, Bendo, George J., Bianchi, S., Cortese, Luca, De Looze, I., Pohlen, Michael, Verstappen, J., Böhringer, H., Bomans, D. J., Boselli, A., Corbelli, E., Dariush, Aliakbar, di Serego Alighieri, S., Fadda, D., Garcia-Appadoo, D. A., Gavazzi, G., Giovanardi, C., Grossi, M., Hughes, Thomas Marcus, Hunt, L. K., Jones, A. P., Madden, S., Pierini, D., Sabatini, S., Smith, Matthew William L., Vlahakis, C., and Zibetti, S.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics, QB
Abstract

The origin of the far-infrared emission from the nearby radio galaxy M 87 remains a matter of debate. Some studies find evidence of a far-infrared excess due to thermal dust emission, whereas others propose that the far-infrared emission can be explained by synchrotron emission without the need for an additional dust emission component. We present Herschel PACS and SPIRE observations of M 87, taken as part of the science demonstration phase observations of the Herschel Virgo Cluster Survey. We compare these data with a synchrotron model based on mid-infrared, far-infrared, submm and radio data from the literature to investigate the origin of the far-infrared emission. Both the integrated SED and the Herschel surface brightness maps are adequately explained by synchrotron emission. At odds with previous claims, we find no evidence of a diffuse dust component in M 87, which is not unexpected in the harsh X-ray environment of this radio galaxy sitting at the core of the Virgo cluster.

Published
2010

19. TheHerschelVirgo Cluster Survey

Author

Baes, M., primary, Clemens, M., additional, Xilouris, E. M., additional, Fritz, J., additional, Cotton, W. D., additional, Davies, J. I., additional, Bendo, G. J., additional, Bianchi, S., additional, Cortese, L., additional, De Looze, I., additional, Pohlen, M., additional, Verstappen, J., additional, Böhringer, H., additional, Bomans, D. J., additional, Boselli, A., additional, Corbelli, E., additional, Dariush, A., additional, di Serego Alighieri, S., additional, Fadda, D., additional, Garcia-Appadoo, D. A., additional, Gavazzi, G., additional, Giovanardi, C., additional, Grossi, M., additional, Hughes, T. M., additional, Hunt, L. K., additional, Jones, A. P., additional, Madden, S., additional, Pierini, D., additional, Sabatini, S., additional, Smith, M. W. L., additional, Vlahakis, C., additional, and Zibetti, S., additional

Published
2010
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20. Parsec-scale dust distributions in Seyfert galaxies

Author

Tristram, K. R. W., primary, Raban, D., additional, Meisenheimer, K., additional, Jaffe, W., additional, Röttgering, H., additional, Burtscher, L., additional, Cotton, W. D., additional, Graser, U., additional, Henning, Th., additional, Leinert, Ch., additional, Lopez, B., additional, Morel, S., additional, Perrin, G., additional, and Wittkowski, M., additional

Published
2009
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27. Resolving the complex structure of the dust torus in the active nucleus of the Circinus galaxy

Author

Tristram, K. R. W., primary, Meisenheimer, K., additional, Jaffe, W., additional, Schartmann, M., additional, Rix, H.-W., additional, Leinert, Ch., additional, Morel, S., additional, Wittkowski, M., additional, Röttgering, H., additional, Perrin, G., additional, Lopez, B., additional, Raban, D., additional, Cotton, W. D., additional, Graser, U., additional, Paresce, F., additional, and Henning, Th., additional

Published
2007
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28. Resolving the innermost parsec of Centaurus A at mid-infrared wavelengths

Author

Meisenheimer, K., primary, Tristram, K. R. W., additional, Jaffe, W., additional, Israel, F., additional, Neumayer, N., additional, Raban, D., additional, Röttgering, H., additional, Cotton, W. D., additional, Graser, U., additional, Henning, Th., additional, Leinert, Ch., additional, Lopez, B., additional, Perrin, G., additional, and Prieto, A., additional

Published
2007
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29. Further VLBA observations of SiO masers toward Mira variable stars

Author

Cotton, W. D., primary, Vlemmings, W., additional, Mennesson, B., additional, Perrin, G., additional, Coudé du Foresto, V., additional, Chagnon, G., additional, Diamond, P. J., additional, van Langevelde, H. J., additional, Bakker, E., additional, Ridgway, S., additional, Mc Allister, H., additional, Traub, W., additional, and Ragland, S., additional

Published
2006
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30. The B3–VLA CSS sample

Author

Fanti, C., primary, Branchesi, M., additional, Cotton, W. D., additional, Dallacasa, D., additional, Fanti, R., additional, Gregorini, L., additional, Murgia, M., additional, Stanghellini, C., additional, and Vigotti, M., additional

Published
2004
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31. Mid-infrared sizes of circumstellar disks around Herbig Ae/Be stars measured with MIDI on the VLTI

Author

Leinert, Ch., primary, van Boekel, R., additional, Waters, L. B. F. M., additional, Chesneau, O., additional, Malbet, F., additional, Köhler, R., additional, Jaffe, W., additional, Ratzka, Th., additional, Dutrey, A., additional, Preibisch, Th., additional, Graser, U., additional, Bakker, E., additional, Chagnon, G., additional, Cotton, W. D., additional, Dominik, C., additional, Dullemond, C. P., additional, Glazenborg-Kluttig, A. W., additional, Glindemann, A., additional, Henning, Th., additional, Hofmann, K.-H., additional, de Jong, J., additional, Lenzen, R., additional, Ligori, S., additional, Lopez, B., additional, Meisner, J., additional, Morel, S., additional, Paresce, F., additional, Pel, J.-W., additional, Percheron, I., additional, Perrin, G., additional, Przygodda, F., additional, Richichi, A., additional, Schöller, M., additional, Schuller, P., additional, Stecklum, B., additional, van den Ancker, M. E., additional, von der Lühe, O., additional, and Weigelt, G., additional

Published
2004
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