6 results on '"Rebecca Kennedy"'
Search Results
2. Galaxy And Mass Assembly (GAMA): Galaxy colour gradients versus colour, structure, and luminosity
- Author
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Rebecca Kennedy, Benedetta Vulcani, Andrew M. Hopkins, Sarah Brough, Boris Häußler, Steven P. Bamford, Benne W. Holwerda, and Marina Vika
- Subjects
Physics ,education.field_of_study ,010308 nuclear & particles physics ,Population ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies ,01 natural sciences ,Galaxy ,Accretion (astrophysics) ,Bimodality ,Luminosity ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,education ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
Using single-component fits to SDSS/UKIDSS images of galaxies in the G09 region of the GAMA survey we study radial colour gradients across the galaxy population. We use the multiwavelength information provided by MegaMorph analysis of galaxy light profiles to calculate intrinsic colour gradients, and divide into six subsamples split by overall S\'{e}rsic index ($n$) and galaxy colour. We find a bimodality in the colour gradients of high- and low-$n$ galaxies in all wavebands, which varies with overall galaxy luminosity. Global trends in colour gradients therefore result from combining the contrasting behaviour of a number of different galaxy populations. The ubiquity of strong negative colour gradients supports the picture of inside-out growth through gas accretion for blue, low-$n$ galaxies, and through dry minor mergers for red, high-$n$ galaxies. An exception is the blue high-n population, with properties indicative of dissipative major mergers., Comment: 4 pages, 2 figures, accepted by A&A
- Published
- 2016
3. Galaxy And Mass Assembly (GAMA): the stellar mass budget by galaxy type
- Author
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Amanda J. Moffett, Simon P. Driver, Prajwal R. Kafle, Rebecca A. Lange, Stephen A. Ingarfield, U. Meštrić, Lee S. Kelvin, Ivan K. Baldry, Joss Bland-Hawthorn, Michelle E. Cluver, Rebecca Kennedy, Sarah Brough, Peder Norberg, Edward N. Taylor, Benne W. Holwerda, Andrew M. Hopkins, Luke J. M. Davies, Aaron S. G. Robotham, Mehmet Alpaslan, Science & Technology Facilities Council, and University of St Andrews. School of Physics and Astronomy
- Subjects
luminosity function, mass function [Galaxies] ,Stellar mass ,NDAS ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Galaxy merger ,elliptical and lenticular, cD [Galaxies] ,Disc galaxy ,01 natural sciences ,statistics [Galaxies] ,0103 physical sciences ,QB Astronomy ,Interacting galaxy ,010303 astronomy & astrophysics ,Lenticular galaxy ,QC ,Astrophysics::Galaxy Astrophysics ,QB ,spiral [Galaxies] ,Physics ,fundamental paramaters [Galaxies] ,010308 nuclear & particles physics ,Astronomy ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Dwarf spheroidal galaxy ,QC Physics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Elliptical galaxy ,Astrophysics::Earth and Planetary Astrophysics - Abstract
We report an expanded sample of visual morphological classifications from the Galaxy and Mass Assembly (GAMA) survey phase two, which now includes 7,556 objects (previously 3,727 in phase one). We define a local (z, 13 pages, 9 figures (high-resolution figures available in journal version), MNRAS accepted
- Published
- 2016
4. Galaxy And Mass Assembly (GAMA): the wavelength dependence of galaxy structure versus redshift and luminosity
- Author
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Steven P. Bamford, Amanda J. Moffett, Lee S. Kelvin, Ivan K. Baldry, Richard J. Tuffs, Marina Vika, Benedetta Vulcani, Edward N. Taylor, Andrew M. Hopkins, Rebecca A. Lange, Cristina C. Popescu, Boris Häußler, Rebecca Kennedy, and Benne W. Holwerda
- Subjects
Physics ,Effective radius ,Opacity ,media_common.quotation_subject ,FOS: Physical sciences ,Astronomy ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Redshift ,Galaxy ,Luminosity ,Wavelength ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Contrast (vision) ,Astrophysics::Galaxy Astrophysics ,media_common ,QB - Abstract
We study how the sizes and radial profiles of galaxies vary with wavelength, by fitting Sersic functions simultaneously to imaging in nine optical and near-infrared bands. To quantify the wavelength dependence of effective radius we use the ratio, $\mathcal{R}$, of measurements in two restframe bands. The dependence of Sersic index on wavelength, $\mathcal{N}$, is computed correspondingly. Vulcani et al. (2014) have demonstrated that different galaxy populations present sharply contrasting behaviour in terms of $\mathcal{R}$ and $\mathcal{N}$. Here we study the luminosity dependence of this result. We find that at higher luminosities, early-type galaxies display a more substantial decrease in effective radius with wavelength, whereas late-types present a more pronounced increase in Sersic index. The structural contrast between types thus increases with luminosity. By considering samples at different redshifts, we demonstrate that lower data quality reduces the apparent difference between the main galaxy populations. However, our conclusions remain robust to this effect. We show that accounting for different redshift and luminosity selections partly reconciles the size variation measured by Vulcani et al. with the weaker trends found by other recent studies. Dividing galaxies by visual morphology confirms the behaviour inferred using morphological proxies, although the sample size is greatly reduced. Finally, we demonstrate that varying dust opacity and disc inclination can account for features of the joint distribution of $\mathcal{R}$ and $\mathcal{N}$ for late-type galaxies. However, dust does not appear to explain the highest values of $\mathcal{R}$ and $\mathcal{N}$. The bulge-disc nature of galaxies must also contribute to the wavelength-dependence of their structure., 14 pages, 11 figures, accepted by MNRAS; v2 corrected to match journal version
- Published
- 2015
5. Galaxy And Mass Assembly (GAMA): $\mathcal{M_\star}-R_{\rm e}$ relations of $z=0$ bulges, discs and spheroids
- Author
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Cristina Popescu, Lee S. Kelvin, B. Häußler, Mehmet Alpaslan, Benne W. Holwerda, Amanda J. Moffett, Joss Bland-Hawthorn, Ivan K. Baldry, Steven Phillipps, Rebecca A. Lange, Michelle E. Cluver, A. H. Wright, Matthew Colless, Edward N. Taylor, Malcolm N. Bremer, Prajwal R. Kafle, Christopher J. Conselice, Jochen Liske, Claudia del P. Lagos, Berta Margalef-Bentabol, Rebecca Kennedy, Sarah Brough, Luke J. M. Davies, Aaron S. G. Robotham, Eelco van Kampen, Richard J. Tuffs, Andrew M. Hopkins, and Simon P. Driver
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Stellar mass ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,F500 ,Parameter space ,01 natural sciences ,Bulge ,0103 physical sciences ,Galaxy formation and evolution ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Physics ,010308 nuclear & particles physics ,Sigma ,Astronomy ,Astronomy and Astrophysics ,Radius ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Redshift ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We perform automated bulge + disc decomposition on a sample of $\sim$7500 galaxies from the Galaxy And Mass Assembly (GAMA) survey in the redshift range of 0.002$, Comment: 33 pages, 14 + 7 Figures, MNRAS accepted
6. Galaxy and Mass Assembly (GAMA): Morphological transformation of galaxies across the green valley
- Author
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Luke J. M. Davies, Malcolm N. Bremer, Steven P. Bamford, Edward N. Taylor, Lee S. Kelvin, Benne W. Holwerda, B. Häußler, Amanda J. Moffett, Susan M. Percival, Andrew M. Hopkins, Rebecca Kennedy, Jochen Liske, Steven Phillipps, R. De Propris, Phil A. James, Simon P. Driver, and University of St Andrews. School of Physics and Astronomy
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structure [Galaxies] ,Population ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,star formation [Galaxies] ,Morphological transformation ,bulges [Galaxies] ,Bulge ,0103 physical sciences ,QB Astronomy ,Astrophysics::Solar and Stellar Astrophysics ,education ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,QC ,QB ,Physics ,education.field_of_study ,ta115 ,010308 nuclear & particles physics ,Star formation ,Single component ,Astronomy and Astrophysics ,DAS ,evolution [Galaxies] ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,Redshift ,Early type ,QC Physics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,stellar content [Galaxies] ,Astrophysics::Earth and Planetary Astrophysics - Abstract
We explore constraints on the joint photometric and morphological evolution of typical low redshift galaxies as they move from the blue cloud through the green valley and onto the red sequence. We select GAMA survey galaxies with $10.25, Comment: MNRAS, in press
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