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    The Role Of Bulge Formation In The Homogenization Of Stellar Populations At Z Similar To 2 As Revealed By Internal Color Dispersion In CANDELS

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    2015_04_rolebulge.pdf (2.728Mb)
    Date
    2015-04
    Author
    Boada, Steven
    Tilvi, Vithal
    Papovich, Casey
    Quadri, R. F.
    Hilton, M.
    Finkelstein, Steven L.
    Guo, Y. C.
    Bond, N.
    Conselice, C.
    Dekel, Avishai
    Ferguson, H.
    Giavalisco, Mauro
    Grogin, N. A.
    Kocevski, D. D.
    Koekemoer, A. M.
    Koo, D. C.
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    Abstract
    We use data from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey to study how the spatial variation in the stellar populations of galaxies relates to the formation of galaxies at 1.5 < z < 3.5. We use the internal color dispersion (ICD), measured between the rest-frame UV and optical bands, which is sensitive to age (and dust attenuation) variations in stellar populations. The ICD shows a relation with the stellar masses and morphologies of the galaxies. Galaxies with the largest variation in their stellar populations as evidenced by high ICD have disk-dominated morphologies (with Sersic indexes < 2) and stellar masses between 10 < log (M/M-circle dot) < 11. There is a marked decrease in the ICD as the stellar mass and/or the Sersic index increases. By studying the relations between the ICD and other galaxy properties including size, total color, star formation rate, and dust attenuation, we conclude that the largest variations in stellar populations occur in galaxies where the light from newly, high star-forming clumps contrasts older stellar disk populations. This phase reaches a peak for galaxies only with a specific stellar mass range, 10 < log (M/M-circle dot) < 11, and prior to the formation of a substantial bulge/spheroid. In contrast, galaxies at higher or lower stellar masses and/or higher Sersic index (n > 2) show reduced ICD values, implying a greater homogeneity of their stellar populations. This indicates that if a galaxy is to have a quiescent bulge along with a star-forming disk, typical of Hubble sequence galaxies, this is most common for stellar masses 10 < log (M/M-circle dot) < 11 and when the bulge component remains relatively small (n < 2).
    Department
    Astronomy
    Subject
    galaxies: evolution
    galaxies: general
    galaxies: stellar content
    galaxies: structure
    star-forming galaxies
    ultra deep field
    spectral energy-distributions
    extragalactic legacy survey
    kiloparsec-scale clumps
    lyman break
    galaxies
    massive galaxies
    hubble sequence
    camera 3
    photometric
    redshifts
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34696
    Citation
    Boada, Steven, V. Tilvi, C. Papovich, R. F. Quadri, M. Hilton, S. Finkelstein, Yicheng Guo et al. "The Role of Bulge Formation in the Homogenization of Stellar Populations at z~ 2 as revealed by Internal Color Dispersion in CANDELS." The Astrophysical Journal, Vol. 803, No. 2 (Apr., 2015): 104.
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