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Amanda J Moffett - One of the best experts on this subject based on the ideXlab platform.

  • eco and resolve galaxy disk growth in Environmental Context
    The Astrophysical Journal, 2015
    Co-Authors: Amanda J Moffett, Sheila J Kannappan, Andreas A Berlind, Kathleen D Eckert, David V Stark, David Hendel, Mark A Norris, Norman A Grogin
    Abstract:

    We study the relationships between galaxy environments and galaxy properties related to disk (re)growth, considering two highly complete samples that are approximately baryonic mass limited into the high-mass dwarf galaxy regime, the Environmental Context catalog (data release herein) and the B-semester region of the REsolved Spectroscopy Of a Local VolumE survey. We quantify galaxy environments using both group identification and smoothed galaxy density field methods. We use by-eye and quantitative morphological classifications plus atomic gas content measurements and estimates. We find that blue early-type (E/S0) galaxies, gas-dominated galaxies, and UV-bright disk host galaxies all become distinctly more common below group halo mass $\sim {10}^{11.5}\;{M}_{\odot }$, implying that this low group halo mass regime may be a preferred regime for significant disk growth activity. We also find that blue early-type and blue late-type galaxies inhabit environments of similar group halo mass at fixed baryonic mass, consistent with a scenario in which blue early-types can regrow late-type disks. In fact, we find that the only significant difference in the typical group halo mass inhabited by different galaxy classes is for satellite galaxies with different colors, where at fixed baryonic mass red early- and late-types have higher typical group halo masses than blue early- and late-types. More generally, we argue that the traditional morphology–environment relation (i.e., that denser environments tend to have more early-types) can be largely attributed to the morphology-galaxy mass relation for centrals and the color–environment relation for satellites.

  • eco and resolve galaxy disk growth in Environmental Context
    arXiv: Astrophysics of Galaxies, 2015
    Co-Authors: Amanda J Moffett, Sheila J Kannappan, Andreas A Berlind, Kathleen D Eckert, David V Stark, David Hendel, Mark A Norris, Norman A Grogin
    Abstract:

    We study the relationships between galaxy environments and galaxy properties related to disk (re)growth, considering two highly complete samples that are approximately baryonic mass limited into the high-mass dwarf galaxy regime, the Environmental Context (ECO) catalog (data release herein) and the B-semester region of the REsolved Spectroscopy Of a Local VolumE (RESOLVE) survey. We quantify galaxy environments using both group identification and smoothed galaxy density field methods. We use by-eye and quantitative morphological classifications plus atomic gas content measurements and estimates. We find that blue early-type (E/S0) galaxies, gas-dominated galaxies, and UV-bright disk host galaxies all become distinctly more common below group halo mass ~10^11.5 Msun, implying that this low group halo mass regime may be a preferred regime for significant disk growth activity. We also find that blue early-type and blue late-type galaxies inhabit environments of similar group halo mass at fixed baryonic mass, consistent with a scenario in which blue early types can regrow late-type disks. In fact, we find that the only significant difference in the typical group halo mass inhabited by different galaxy classes is for satellite galaxies with different colors, where at fixed baryonic mass red early and late types have higher typical group halo masses than blue early and late types. More generally, we argue that the traditional morphology-environment relation (i.e., that denser environments tend to have more early types) can be largely attributed to the morphology-galaxy mass relation for centrals and the color-environment relation for satellites.

Norman A Grogin - One of the best experts on this subject based on the ideXlab platform.

  • eco and resolve galaxy disk growth in Environmental Context
    The Astrophysical Journal, 2015
    Co-Authors: Amanda J Moffett, Sheila J Kannappan, Andreas A Berlind, Kathleen D Eckert, David V Stark, David Hendel, Mark A Norris, Norman A Grogin
    Abstract:

    We study the relationships between galaxy environments and galaxy properties related to disk (re)growth, considering two highly complete samples that are approximately baryonic mass limited into the high-mass dwarf galaxy regime, the Environmental Context catalog (data release herein) and the B-semester region of the REsolved Spectroscopy Of a Local VolumE survey. We quantify galaxy environments using both group identification and smoothed galaxy density field methods. We use by-eye and quantitative morphological classifications plus atomic gas content measurements and estimates. We find that blue early-type (E/S0) galaxies, gas-dominated galaxies, and UV-bright disk host galaxies all become distinctly more common below group halo mass $\sim {10}^{11.5}\;{M}_{\odot }$, implying that this low group halo mass regime may be a preferred regime for significant disk growth activity. We also find that blue early-type and blue late-type galaxies inhabit environments of similar group halo mass at fixed baryonic mass, consistent with a scenario in which blue early-types can regrow late-type disks. In fact, we find that the only significant difference in the typical group halo mass inhabited by different galaxy classes is for satellite galaxies with different colors, where at fixed baryonic mass red early- and late-types have higher typical group halo masses than blue early- and late-types. More generally, we argue that the traditional morphology–environment relation (i.e., that denser environments tend to have more early-types) can be largely attributed to the morphology-galaxy mass relation for centrals and the color–environment relation for satellites.

  • eco and resolve galaxy disk growth in Environmental Context
    arXiv: Astrophysics of Galaxies, 2015
    Co-Authors: Amanda J Moffett, Sheila J Kannappan, Andreas A Berlind, Kathleen D Eckert, David V Stark, David Hendel, Mark A Norris, Norman A Grogin
    Abstract:

    We study the relationships between galaxy environments and galaxy properties related to disk (re)growth, considering two highly complete samples that are approximately baryonic mass limited into the high-mass dwarf galaxy regime, the Environmental Context (ECO) catalog (data release herein) and the B-semester region of the REsolved Spectroscopy Of a Local VolumE (RESOLVE) survey. We quantify galaxy environments using both group identification and smoothed galaxy density field methods. We use by-eye and quantitative morphological classifications plus atomic gas content measurements and estimates. We find that blue early-type (E/S0) galaxies, gas-dominated galaxies, and UV-bright disk host galaxies all become distinctly more common below group halo mass ~10^11.5 Msun, implying that this low group halo mass regime may be a preferred regime for significant disk growth activity. We also find that blue early-type and blue late-type galaxies inhabit environments of similar group halo mass at fixed baryonic mass, consistent with a scenario in which blue early types can regrow late-type disks. In fact, we find that the only significant difference in the typical group halo mass inhabited by different galaxy classes is for satellite galaxies with different colors, where at fixed baryonic mass red early and late types have higher typical group halo masses than blue early and late types. More generally, we argue that the traditional morphology-environment relation (i.e., that denser environments tend to have more early types) can be largely attributed to the morphology-galaxy mass relation for centrals and the color-environment relation for satellites.

Emma J Reeves - One of the best experts on this subject based on the ideXlab platform.

  • phylogenetic and Environmental Context of a tournaisian tetrapod fauna
    Nature Ecology and Evolution, 2017
    Co-Authors: Jennifer A Clack, Carys E Bennett, David K Carpenter, Sarah J Davies, Nicholas N Fraser, Timothy I Kearsey, J E A Marshall, D Millward, Benjamin K A Otoo, Emma J Reeves
    Abstract:

    The end-Devonian to mid-Mississippian time interval has long been known for its depauperate palaeontological record, especially for tetrapods. This interval encapsulates the time of increasing terrestriality among tetrapods, but only two Tournaisian localities previously produced tetrapod fossils. Here we describe five new Tournaisian tetrapods (Perittodus apsconditus, Koilops herma, Ossirarus kierani, Diploradus austiumensis and Aytonerpeton microps) from two localities in their Environmental Context. A phylogenetic analysis retrieved three taxa as stem tetrapods, interspersed among Devonian and Carboniferous forms, and two as stem amphibians, suggesting a deep split among crown tetrapods. We also illustrate new tetrapod specimens from these and additional localities in the Scottish Borders region. The new taxa and specimens suggest that tetrapod diversification was well established by the Tournaisian. Sedimentary evidence indicates that the tetrapod fossils are usually associated with sandy siltstones overlying wetland palaeosols. Tetrapods were probably living on vegetated surfaces that were subsequently flooded. We show that atmospheric oxygen levels were stable across the Devonian/Carboniferous boundary, and did not inhibit the evolution of terrestriality. This wealth of tetrapods from Tournaisian localities highlights the potential for discoveries elsewhere.

  • Phylogenetic and Environmental Context of a Tournaisian tetrapod fauna
    Nature Ecology & Evolution, 2016
    Co-Authors: Jennifer A Clack, Carys E Bennett, David K Carpenter, Sarah J Davies, Timothy I Kearsey, J E A Marshall, D Millward, Benjamin K A Otoo, Nicholas C. Fraser, Emma J Reeves
    Abstract:

    The end-Devonian to mid-Mississippian time interval has long been known for its depauperate palaeontological record, especially for tetrapods. This interval encapsulates the time of increasing terrestriality among tetrapods, but only two Tournaisian localities previously produced tetrapod fossils. Here we describe five new Tournaisian tetrapods ( Perittodus   apsconditus , Koilops   herma , Ossirarus   kierani , Diploradus   austiumensis and Aytonerpeton   microps ) from two localities in their Environmental Context. A phylogenetic analysis retrieved three taxa as stem tetrapods, interspersed among Devonian and Carboniferous forms, and two as stem amphibians, suggesting a deep split among crown tetrapods. We also illustrate new tetrapod specimens from these and additional localities in the Scottish Borders region. The new taxa and specimens suggest that tetrapod diversification was well established by the Tournaisian. Sedimentary evidence indicates that the tetrapod fossils are usually associated with sandy siltstones overlying wetland palaeosols. Tetrapods were probably living on vegetated surfaces that were subsequently flooded. We show that atmospheric oxygen levels were stable across the Devonian/Carboniferous boundary, and did not inhibit the evolution of terrestriality. This wealth of tetrapods from Tournaisian localities highlights the potential for discoveries elsewhere. Romer’s Gap describes the period with few known fossils when early tetrapods were becoming increasingly terrestrial. Here, five new species, three stem tetrapods and two stem amphibians, are described from a location in Scotland shedding light on the phylogeny and environment of this period.

Jennifer A Clack - One of the best experts on this subject based on the ideXlab platform.

  • phylogenetic and Environmental Context of a tournaisian tetrapod fauna
    Nature Ecology and Evolution, 2017
    Co-Authors: Jennifer A Clack, Carys E Bennett, David K Carpenter, Sarah J Davies, Nicholas N Fraser, Timothy I Kearsey, J E A Marshall, D Millward, Benjamin K A Otoo, Emma J Reeves
    Abstract:

    The end-Devonian to mid-Mississippian time interval has long been known for its depauperate palaeontological record, especially for tetrapods. This interval encapsulates the time of increasing terrestriality among tetrapods, but only two Tournaisian localities previously produced tetrapod fossils. Here we describe five new Tournaisian tetrapods (Perittodus apsconditus, Koilops herma, Ossirarus kierani, Diploradus austiumensis and Aytonerpeton microps) from two localities in their Environmental Context. A phylogenetic analysis retrieved three taxa as stem tetrapods, interspersed among Devonian and Carboniferous forms, and two as stem amphibians, suggesting a deep split among crown tetrapods. We also illustrate new tetrapod specimens from these and additional localities in the Scottish Borders region. The new taxa and specimens suggest that tetrapod diversification was well established by the Tournaisian. Sedimentary evidence indicates that the tetrapod fossils are usually associated with sandy siltstones overlying wetland palaeosols. Tetrapods were probably living on vegetated surfaces that were subsequently flooded. We show that atmospheric oxygen levels were stable across the Devonian/Carboniferous boundary, and did not inhibit the evolution of terrestriality. This wealth of tetrapods from Tournaisian localities highlights the potential for discoveries elsewhere.

  • Phylogenetic and Environmental Context of a Tournaisian tetrapod fauna
    Nature Ecology & Evolution, 2016
    Co-Authors: Jennifer A Clack, Carys E Bennett, David K Carpenter, Sarah J Davies, Timothy I Kearsey, J E A Marshall, D Millward, Benjamin K A Otoo, Nicholas C. Fraser, Emma J Reeves
    Abstract:

    The end-Devonian to mid-Mississippian time interval has long been known for its depauperate palaeontological record, especially for tetrapods. This interval encapsulates the time of increasing terrestriality among tetrapods, but only two Tournaisian localities previously produced tetrapod fossils. Here we describe five new Tournaisian tetrapods ( Perittodus   apsconditus , Koilops   herma , Ossirarus   kierani , Diploradus   austiumensis and Aytonerpeton   microps ) from two localities in their Environmental Context. A phylogenetic analysis retrieved three taxa as stem tetrapods, interspersed among Devonian and Carboniferous forms, and two as stem amphibians, suggesting a deep split among crown tetrapods. We also illustrate new tetrapod specimens from these and additional localities in the Scottish Borders region. The new taxa and specimens suggest that tetrapod diversification was well established by the Tournaisian. Sedimentary evidence indicates that the tetrapod fossils are usually associated with sandy siltstones overlying wetland palaeosols. Tetrapods were probably living on vegetated surfaces that were subsequently flooded. We show that atmospheric oxygen levels were stable across the Devonian/Carboniferous boundary, and did not inhibit the evolution of terrestriality. This wealth of tetrapods from Tournaisian localities highlights the potential for discoveries elsewhere. Romer’s Gap describes the period with few known fossils when early tetrapods were becoming increasingly terrestrial. Here, five new species, three stem tetrapods and two stem amphibians, are described from a location in Scotland shedding light on the phylogeny and environment of this period.

Anouk Scheres - One of the best experts on this subject based on the ideXlab platform.

  • When unfamiliarity matters: changing Environmental Context between study and test affects recognition memory for unfamiliar stimuli.
    Journal of Experimental Psychology: Learning Memory and Cognition, 1999
    Co-Authors: Riccardo Russo, Geoffrey D Ward, Hilde M. Geurts, Anouk Scheres
    Abstract:

    Performance in recognition memory has been shown to be relatively insensitive to the effect of Environmental Context changes between study and test. Recent evidence (P. Dalton, 1993) showed that Environmental Context changes between study and test affected recognition memory discrimination for unfamiliar stimuli (faces). The present study presented 2 experiments that replicated this finding, refined the experimental methodology, and extended the findings to unfamiliar verbal material (nonwords). Finally, a 3rd experiment showed that Contextual changes did not affect recognition memory discrimination for familiar verbal material (words). Overall, the present study provides evidence in favor of Context-dependent recognition when the material to be remembered is unfamiliar