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1,660 results on '"Bailey, Martin"'

4. The Extremely Metal-poor SN 2023ufx: A Local Analog to High-redshift Type II Supernovae

Author

Michael A. Tucker, Jason Hinkle, Charlotte R. Angus, Katie Auchettl, Willem B. Hoogendam, Benjamin Shappee, Christopher S. Kochanek, Chris Ashall, Thomas de Boer, Kenneth C. Chambers, Dhvanil D. Desai, Aaron Do, Michael D. Fulton, Hua Gao, Joanna Herman, Mark Huber, Chris Lidman, Chien-Cheng Lin, Thomas B. Lowe, Eugene A. Magnier, Bailey Martin, Paloma Mínguez, Matt Nicholl, Miika Pursiainen, S. J. Smartt, Ken W. Smith, Shubham Srivastav, Brad E. Tucker, and Richard J. Wainscoat

Subjects
Nucleosynthesis, Metallicity, Interacting binary stars, Type II supernovae, Stellar jets, Stellar winds, Astrophysics, QB460-466
Abstract

We present extensive observations of the Type II supernova (SN II) SN 2023ufx, which is likely the most metal-poor SN II observed to date. It exploded in the outskirts of a low-metallicity ( Z _host ∼ 0.1 Z _⊙ ) dwarf ( M _g = −13.39 ± 0.16 mag, r _proj ∼ 1 kpc) galaxy. The explosion is luminous, peaking at M _g ≈ −18.5 mag, and shows rapid evolution. The r -band (pseudobolometric) light curve has a shock-cooling phase lasting 20 (17) days followed by a 19 (23) day plateau. The entire optically thick phase lasts only ≈55 days following explosion, indicating that the red supergiant progenitor had a thinned H envelope prior to explosion. The early spectra obtained during the shock-cooling phase show no evidence for narrow emission features and limit the preexplosion mass-loss rate to $\dot{M}\lesssim {10}^{-3}$ M _⊙ yr ^−1 . The photospheric-phase spectra are devoid of prominent metal absorption features, indicating a progenitor metallicity of ≲0.1 Z _⊙ . The seminebular (∼60–130 days) spectra reveal weak Fe ii , but other metal species typically observed at these phases (Ti ii , Sc ii , and Ba ii ) are conspicuously absent. The late-phase optical and near-infrared spectra also reveal broad (≈10 ^4 km s ^−1 ) double-peaked H α , P β , and P γ emission profiles suggestive of a fast outflow launched during the explosion. Outflows are typically attributed to rapidly rotating progenitors, which also prefer metal-poor environments. This is only the second SN II with ≲0.1 Z _⊙ and both exhibit peculiar evolution, suggesting a sizable fraction of metal-poor SNe II have distinct properties compared to nearby metal-enriched SNe II. These observations lay the groundwork for modeling the metal-poor SNe II expected in the early Universe.

Published
2024
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11. Spatial and temporal variability in length, weight and lipid content at age of the lesser sandeel Ammodytes marinus Raitt in the northern North Sea and adjacent waters

Author

Bailey, Martin C.

Subjects
590, Zoology
Abstract

In order to investigate the spatial variability in length and weight at age seen in Ammodytes marinus during the period 1974-1977 (Anon. 1978), samples of A. marinus were collected during 1991 from Shetland, Fair Isle, the Fisher Bank, the Skagerrak and Rona. The samples were collected from the five sites during July when the peak in summer growth rate would have passed and any spatial differences resulting would be most marked. Greatest differences in length, weight and total lipid content were found to exist between fish from Shetland and the Fisher Bank. At the Fisher Bank fish were significantly longer, heavier and contained more lipid than fish of the same age at Shetland. Principal Component Analysis (PCA) was carried out on the 0 group and pooled 1 and 2+ group data. 82.5% (0-group) and 72.0% (1 and 2+ group) of the variance within the data was explained by the first two principal components. Plots of the scores of the first two principal components from the respective PCA's supported the spatial differences revealed in the analysis of the length, weight and lipid data. Sea temperatures and zooplankton biomass were suggested as factors influencing the spatial differences in size at age. Samples of A. marinus were also collected from Shetland and the Fisher Bank throughout the summer of 1991 to investigate differences in growth rate and lipid accumulation over a protracted period. Temporal differences in size at age could therefore be investigated. Over the four month study period fish of all age classes were found to be longer, heavier and containing more lipid at the Fisher Bank that at Shetland supporting the earlier analysis.

Published
1996

23. The Mysteries of Arles

Author

Bailey, Martin

Subjects
Gogh, Vincent Van -- Cases -- Biography, Self-mutilation -- Cases, Painters -- Cases -- Biography, Company legal issue, Arts, visual and performing
Abstract

Was Van Gogh arrested in Arles on the fateful night that he severed his own ear? Martin Bailey presents fresh evidence to suggest so, and looks back at a year [...]

Published
2016

30. 50 WAYS TO WORK FASTER.

Author

Collins, Barry, Danton, Tim, Athan, Jon, Bailey, Martin, Campbell, Geoff, McCool, Paul, Halsey, Mike, Johnson, John, Mellor, Si, Neuschul, Robert, Shifreen, Robert, Tömpsett, Gerald, and Wright, John

Subjects
ARTIFICIAL intelligence, SOFTWARE upgrades, ACHROMATISM, PDF (Computer file format), ELECTRONIC spreadsheets
Abstract

GOOGLE DOCS Auto-generate summaries It feels like this is a feature that will soon become commonplace with the advance of AI tools, but if you've got a long report in Google Docs and need a quick summary, Docs can do this for you, provided you're a Workspace subscriber. ENABLE FOREST Forest is a cross-platform app (plus a Chrome extension in Windows) that allows you to create a "blocklist" of apps to stop you from becoming distracted. A Google search will bring up a list of articles that cover the subject, but Bing's AI tool provides a shortlist of five candidates and provides nearby locations where you can buy them from. GENERATIVE AI Shorten search times There's a reason that Google's share value dropped by 10 percent when its AI demonstration went wrong: AI-powered search is the future. [Extracted from the article]

Published
2023

48. Discussion

Author

Bailey, Martin J., Minsky, Hyman P., and Hester, Donald D.

Published
1971

50. Discussion

Author

Eldridge, Douglas H., Bailey, Martin J., and Stubblebine, William Craig

Published
1966

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