Richard Sharp PhD

Richard Sharp


Publications:
2015
  Galaxy And Mass Assembly (GAMA): end of survey report and data release 2
Liske, J, Baldry, IK, Driver, P, Tuffs, RJ, Alpaslan, M, Andrae, E, Brough, S, Cluver, ME, Grootes, MW, Gunawardhana, MLP, Kelvin, LS, Loveday, J, Robotham, ASG, Taylor, EN, Bamford, SP, Bland-Hawthorn, J, Brown, MJI, Drinkwater, MJ, Hopkins, AM, Meyer, MJ, Norberg, P, Peacock, JA, Agius, NK, Andrews, SK, Bauer, AE, Ching, JHY, Colless, M, Conselice, CJ, Croom, SM, Davies, LJM, De Propris, R, Dunne, L, Eardley, EM, Ellis, S, Foster, C, Frenk, CS, Haessler, B, Holwerda, BW, Howlett, C, Ibarra, H, Jarvis, MJ, Jones, DH, Kafle, PR, Lacey, CG, Lange, R, Lara-Lopez, MA, Lopez-Sanchez, AR, Maddox, S, Madore, BF, McNaught-Roberts, T, Moffett, AJ, Nichol, RC, Owers, MS, Palamara, D, Penny, SJ, Phillipps, S, Pimbblet, KA, Popescu, CC, Prescott, M, Proctor, R, Sadler, EM, Sansom, AE, Seibert, M, Sharp, R, Sutherland, W, Vazquez-Mata, JA, van Kampen, E, Wilkins, SM, Williams, R & Wright, AH 2015, 'Galaxy And Mass Assembly (GAMA): end of survey report and data release 2' Monthly Notices of the Royal Astronomical Society, vol 452, no. 2, pp. 2087-2126. DOI: 10.1093/mnras/stv1436

The Galaxy And Mass Assembly (GAMA) survey is one of the largest contemporary spectroscopic surveys of low redshift galaxies. Covering an area of similar to 286 deg(2) (split among five survey regions) down to a limiting magnitude of r <19.8 mag, we have collected spectra and reliable redshifts for 238 000 objects using the AAOmega spectrograph on the Anglo-Australian Telescope. In addition, we have assembled imaging data from a number of independent surveys in order to generate photometry spanning the wavelength range 1 nm(-1) m. Here, we report on the recently completed spectroscopic survey and present a series of diagnostics to assess its final state and the quality of the redshift data. We also describe a number of survey aspects and procedures, or updates thereof, including changes to the input catalogue, redshifting and re-redshifting, and the derivation of ultraviolet, optical and near-infrared photometry. Finally, we present the second public release of GAMA data. In this release, we provide input catalogue and targeting information, spectra, redshifts, ultraviolet, optical and near-infrared photometry, single-component Sersic fits, stellar masses, H alpha-derived star formation rates, environment information, and group properties for all galaxies with r <19.0 mag in two of our survey regions, and for all galaxies with r <19.4 mag in a third region (72 225 objects in total). The data base serving these data is available at http://www.gama-survey.org/.


General Information
Organisations: School of Social and Political Science.
Authors: Liske, J., Baldry, I. K., Driver, P., Tuffs, R. J., Alpaslan, M., Andrae, E., Brough, S., Cluver, M. E., Grootes, M. W., Gunawardhana, M. L. P., Kelvin, L. S., Loveday, J., Robotham, A. S. G., Taylor, E. N., Bamford, S. P., Bland-Hawthorn, J., Brown, M. J. I., Drinkwater, M. J., Hopkins, A. M., Meyer, M. J., Norberg, P., Peacock, J. A., Agius, N. K., Andrews, S. K., Bauer, A. E., Ching, J. H. Y., Colless, M., Conselice, C. J., Croom, S. M., Davies, L. J. M., De Propris, R., Dunne, L., Eardley, E. M., Ellis, S., Foster, C., Frenk, C. S., Haessler, B., Holwerda, B. W., Howlett, C., Ibarra, H., Jarvis, M. J., Jones, D. H., Kafle, P. R., Lacey, C. G., Lange, R., Lara-Lopez, M. A., Lopez-Sanchez, A. R., Maddox, S., Madore, B. F., McNaught-Roberts, T., Moffett, A. J., Nichol, R. C., Owers, M. S., Palamara, D., Penny, S. J., Phillipps, S., Pimbblet, K. A., Popescu, C. C., Prescott, M., Proctor, R., Sadler, E. M., Sansom, A. E., Seibert, M., Sharp, R., Sutherland, W., Vazquez-Mata, J. A., van Kampen, E., Wilkins, S. M., Williams, R. & Wright, A. H..
Keywords: (surveys, galaxies: distances and redshifts, galaxies: fundamental parameters, galaxies: general, galaxies: photometry, galaxies: statistics, DIGITAL SKY SURVEY, STAR-FORMING GALAXIES, OSCILLATION SPECTROSCOPIC SURVEY, SPECTRAL ENERGY-DISTRIBUTION, REDSHIFT SURVEY, LUMINOSITY FUNCTION, STELLAR MASS, SDSS-III, ELLIPTIC GALAXIES, PHYSICAL-PROPERTIES. )
Number of pages: 40
Pages: 2087-2126
Publication Date: 11 Sep 2015
Publication Information
Category: Article
Journal: Monthly Notices of the Royal Astronomical Society
Volume: 452
Issue number: 2
ISSN: 0035-8711
Original Language: English
DOIs: 10.1093/mnras/stv1436
2007
  Electrophysiological Correlates of the Segmentation of Simple Events
Sharp, R, Zacks, JM & Donaldson, DI 2007, 'Electrophysiological Correlates of the Segmentation of Simple Events' 48th Annual Meeting for the Psychonomic Society, Long Beach, CA, United States, 15/11/07 - 18/11/07, .
Functional MRI studies have identified a network of brain regions sensitive to perceptually salient boundaries between events. We investigated the neural correlates of event segmentation using scalp-recorded eventrelated potentials. Participants viewed simple animations of randomly moving geometric objects. Top-down expectations were manipulated by instruction: Participants were told either that the objects were moving randomly or that they were performing a goal-directed activity (e.g., one object chasing the other). Participants viewed the movies passively, then segmented them into meaningful units at both a fine and a coarse temporal grain. During passive viewing, significant EEG responses were observed at points that participants later identified as event boundaries. Responses over frontal and parietal cortex were larger for coarse-grained boundaries than for fine-grained boundaries, consistent with the proposal that perceivers group smaller events into larger units. Responses to coarse-grained boundaries were affected more by top-down expectations, suggesting that grouping events depends differentially on top-down mechanisms.
General Information
Organisations: Neuroinformatics DTC.
Authors: Sharp, Richard, Zacks, Jeffery. M. & Donaldson, David I..
Publication Date: 1 Nov 2007
Publication Information
Category: Poster
Original Language: English
  Electrophysiological Correlates of Event Segmentation: How does the human mind process on-going activity?
Sharp, R & Donaldson, DI 2007, 'Electrophysiological Correlates of Event Segmentation: How does the human mind process on-going activity?' 14th Annual Meeting of the Cognitive Neuroscience Society, New York, United States, 5/05/07 - 8/05/07, .
Research using videos of everyday activities and fMRI has identified a network of brain regions that are sensitive to the perceptually salient boundaries between events (Zacks et al., 2001). Here we present an electrophysiological investigation into the neural correlates of event segmentation using scalp recorded Event-Related Potentials (ERPs). Three studies investigate the influence of top-down knowledge (e.g. activity goal) and bottom-up influences (e.g. object involvement), on event segmentation. Task knowledge levels were manipulated by showing participants videos of activities that were familiar (e.g. making the bed), unfamiliar (e.g. setting up a microscope), or recently learned (building a table). In each case participants were required to view the videos passively, and then to view whilst making coarse and fine grained segmentations. Segmentation points were extracted and overlaid onto passive viewing data to allow ERPs to be formed time-locked to the segmentation boundaries. Analysis of coarse grain segmentation revealed a modulation over right-frontal electrodes, relatively positive going during the processing of unfamiliar activities and negative going during the processing of familiar and recently learned activities. In addition, fine grained segmentation was associated with a modulation over left parietal electrodes, negative going during familiar and unfamiliar objects relative to recently learned. The ERP differences demonstrate the activation of topographically dissociable neural components associated with fine and course grained event segmentation. Moreover, these ERP components are differentially sensitive to the amount of knowledge and experience that participants have about the activities being viewed.
General Information
Organisations: Neuroinformatics DTC.
Authors: Sharp, Richard & Donaldson, David I..
Publication Date: 2007
Publication Information
Category: Poster
Original Language: English
  Electrophysiological Correlates of Event Segmentation: How does the human mind process information?
Sharp, R & Donaldson, DI 2007, 'Electrophysiological Correlates of Event Segmentation: How does the human mind process information?'.
General Information
Organisations: Neuroinformatics DTC.
Authors: Sharp, Richard & Donaldson, David I..
Publication Date: 2007
Publication Information
Category: Poster
Original Language: English

Research press coverage:
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Projects:
Neural correlates of event segmentation: How does the human mind process the information? (PhD)