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41 results on '"Adams, N.J."'

1. MIGHTEE-H i: the H i size-mass relation over the last billion years

Author

Rajohnson, S.H.A., Frank, B.S., Ponomare, A.A., Maddox, N., Kraan-Korteweg, R.C., Jarvis, M.J., Adams, E.A.K., Oosterloo, T., Baes, M., Spekkens, K., Adams, N.J., Glowacki, Marcin, Kurapati, S., Prandoni, I., Heywood, I., Collier, J.D., Sekhar, S., Taylor, R., Rajohnson, S.H.A., Frank, B.S., Ponomare, A.A., Maddox, N., Kraan-Korteweg, R.C., Jarvis, M.J., Adams, E.A.K., Oosterloo, T., Baes, M., Spekkens, K., Adams, N.J., Glowacki, Marcin, Kurapati, S., Prandoni, I., Heywood, I., Collier, J.D., Sekhar, S., and Taylor, R.

Abstract

We present the observed H i size-mass relation of 204 galaxies from the MIGHTEE Survey Early Science data. The high sensitivity of MeerKAT allows us to detect galaxies spanning more than 4 orders of magnitude in H i mass, ranging from dwarf galaxies to massive spirals, and including all morphological types. This is the first time the relation has been explored on a blind homogeneous data set that extends over a previously unexplored redshift range of 0 < z < 0.084, i.e. a period of around one billion years in cosmic time. The sample follows the same tight logarithmic relation derived from previous work, between the diameter (DHI) and the mass (MHI) of H i discs. We measure a slope of 0.501 ± 0.008, an intercept of -3.252+0.073-0.074, and an observed scatter of 0.057 dex. For the first time, we quantify the intrinsic scatter of 0.054 ± 0.003 dex (∼10 percent), which provides a constraint for cosmological simulations of galaxy formation and evolution. We derive the relation as a function of galaxy type and find that their intrinsic scatters and slopes are consistent within the errors. We also calculate the DHI-MHI relation for two redshift bins and do not find any evidence for evolution with redshift. These results suggest that over a period of one billion years in look-back time, galaxy discs have not undergone significant evolution in their gas distribution and mean surface mass density, indicating a lack of dependence on both morphological type and redshift.

Published
2022

4. Blood, sweat and tears: a review of non-invasive DNA sampling

Author

Lefort, M.C., primary, Cruickshank, R.H., additional, Descovich, K., additional, Adams, N.J., additional, Barun, A., additional, Emami-Khoyi, A., additional, Ridden, J., additional, Smith, V.R., additional, Sprague, R., additional, Waterhouse, B., additional, and Boyer, S., additional

Published
2018
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5. Maximum diving depths of Cape gannets

Author

Adams, N.J. and Walter, C. B.

Subjects
Sea birds -- Behavior, Biological sciences
Abstract

Maximum dive recorders were employed to measure the maximum diving depths of pursuit diving and plunge diving seabirds such as Cape gannets at Malgas Island. The average maximum diving depth was 5.9 meters. Nearly 30% of all dives was between a model depth of two and four meters. Foraging was observed very close to the surface, at a depth of five to 13 meters. . The African penguin, by contrast, can dive to a depth of 130 meters.

Published
1993

8. Methods of studying the functional ecology of protein and organ dynamics in birds

Author

Piersma, Theunis, Klaassen, Marcel, Adams, N.J., Slotow, R.H., Plant Animal Interactions - Animal Ecology, and Piersma group

Abstract

Birds are capable of adaptive responses to ecological challenges involving changes in body composition, including both body stores and functional tissues. These physiological adjustments may affect aspects of the birds’ ecology, such as choice of diet and microhabitat or susceptibility to aerial predators. Carcass analysis provides accurate data on body composition; however, ethical considerations apart, this method neither enables studies of temporal changes within individuals nor allows compositional analyses to be followed up by studies on the birds’ life history. Various non-terminal methods are available to quantify gross body composition in terms of fat, protein, and water. In addition, energy and mass (nitrogen) balance measurements in caged song birds and shorebirds provide sensitive and robust methods to estimate protein and fat contents of anabolised and catabolised body stores, albeit under laboratory conditions rather than in the field. The potential of new non-terminal methods (i.e. ultrasound, nuclear magnetic resonance imaging and computer tomography), which allow repeated size estimation of various organs, was evaluated in recent studies on shorebirds and swans. These methods probably have the greatest potential in break-through studies in the field of ecophysiological adaptation, because they allow non-invasive, repeated quantification of the size of different organs in individual birds.

Published
1999

15. Foraging patterns of polar penguins

Author

Adams, N.J., Slotow, R.H., Kooyman, G., Hull, C., Olsson, O., Robertson, G., Croxall, J., Davis, L., Adams, N.J., Slotow, R.H., Kooyman, G., Hull, C., Olsson, O., Robertson, G., Croxall, J., and Davis, L.

Published
1999

32. Race and local governance : theoretical reflections and examination of two case studies in the United Kingdom and South Africa: or #who said we weren't interested in justice, equality, democracy and freedom?'; emancipation in the ushering dusk of Black politics as White boys try to switch off the Enlightenment

Author

Adams, N.J.

Subjects
HM
Abstract

As the sub-title suggests, and, as I start to write, this might not turn out to be an ordinary thesis. And who ever said that contingent agency was the sole preserve of the "posties". This introduction is intended to be a digressive statement of annoyance/anger, condensation of the research's core theoretical themes, continuation of a theoretical project started in the '70s, an indication of areas that require further work, and thus, as that solidary prosaism would have it, "work-in-progress.

41. MIGHTEE: are giant radio galaxies more common than we thought?

Author

Emanuele Daddi, M. Brienza, S. L. Blyth, Cyril Tasse, Z. Randriamanakoto, Oleg Smirnov, Sarah V. White, A. R. Taylor, N. J. Adams, J. Delhaize, I. Delvecchio, Mattia Vaccari, I. H. Whittam, Jordan D. Collier, Isabella Prandoni, Martin J. Hardcastle, S. M. Randriamampandry, Matt J. Jarvis, Yiping Ao, Leah K. Morabito, L. Leeuw, C. L. Hale, Nick Seymour, Ian Heywood, Rebecca A. A. Bowler, Matthew Prescott, Lucia Marchetti, Fang Xia An, Jose Afonso, Kshitij Thorat, Natasha Maddox, Srikrishna Sekhar, Marcin Glowacki, Marcus Brüggen, Delhaize J., Heywood I., Prescott M., Jarvis M.J., Delvecchio I., Whittam I.H., White S.V., Hardcastle M.J., Hale C.L., Afonso J., Ao Y., Brienza M., Bruggen M., Collier J.D., Daddi E., Glowacki M., Maddox N., Morabito L.K., Prandoni I., Randriamanakoto Z., Sekhar S., An F., Adams N.J., Blyth S., Bowler R.A.A., Leeuw L., Marchetti L., Randriamampandry S.M., Thorat K., Seymour N., Smirnov O., Taylor A.R., Tasse C., Vaccari M., Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)

Subjects
Field (physics), Radio galaxy, galaxies: active, FOS: Physical sciences, Astrophysics, Poisson distribution, 01 natural sciences, law.invention, Telescope, symbols.namesake, law, 0103 physical sciences, Surface brightness, 010303 astronomy & astrophysics, Very large array, Physics, radio continuum: galaxies, Number density, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Redshift, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Astrophysics of Galaxies (astro-ph.GA), symbols
Abstract

We report the discovery of two new giant radio galaxies (GRGs) using the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey. Both GRGs were found within a 1 deg^2 region inside the COSMOS field. They have redshifts of z=0.1656 and z=0.3363 and physical sizes of 2.4Mpc and 2.0Mpc, respectively. Only the cores of these GRGs were clearly visible in previous high resolution VLA observations, since the diffuse emission of the lobes was resolved out. However, the excellent sensitivity and uv coverage of the new MeerKAT telescope allowed this diffuse emission to be detected. The GRGs occupy a unpopulated region of radio power - size parameter space. Based on a recent estimate of the GRG number density, the probability of finding two or more GRGs with such large sizes at z, 15 pages; 8 figures, accepted for publication in MNRAS on 2020 Dec 9

Published
2021

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