The tully-fisher relation and its residuals for a broadly selected sample of galaxies

James Pizagno, Francisco Prada, David H. Weinberg, R. I X Hans-Walter, Richard W. Pogge, Eva K. Grebel, Daniel Harbeck, Michael Blanton, J. Brinkmann, James E. Gunn

    Research output: Contribution to journalArticle

    Abstract

    We measure the relation between galaxy luminosity and disk circular velocity (the Tully-Fisher [TF] relation), in the g, r, i, and z bands, for a broadly selected sample of galaxies from the Sloan Digital Sky Survey, with the goal of providing well-defined observational constraints for theoretical models of galaxy formation. The input sample of 234 galaxies hasaroughly fiat distribution of absolute magnitudes in the range-18.5 > Mr > -22, and our only morphological selection is an isophotal axis ratio cut b/a < 0.6 to allow accurate inclination corrections. Long-slit spectroscopy from the Calar Alto and MDM observatories yields usable Hα rotation curves for 162 galaxies (69%), with a representative color and morphology distribution. We define circular velocities V80 by evaluating the rotation curve at the radius containing 80% of the i-band light. Observational errors, including estimated distance errors due to peculiar velocities, are small compared to the intrinsic scatter of the TF relation. The slope of the forward TF relation steepens from -5.5 ± 0.2 mag (log10 km s-1) -1 in the g band to -6.6 ± 0.2 mag (log10 km s -1)-1 in the z band. The intrinsic scatter is σ ≈ 0.4 mag in all bands, and residuals from either the forward or inverse relations have an approximately Gaussian distribution. We discuss how Malmquist-type biases may affect the observed slope, intercept, and scatter. The scatter is not dominated by rare outliers or by any particular class of galaxies, although it drops slightly, to σ ≈ 0.36 mag, if we restrict the sample to nearly bulgeless systems. Correlations of TF residuals with other galaxy properties are weak: bluer galaxies are significantly brighter than average in the g-band TF relation but only marginally brighter in the i band; more concentrated (earlier type) galaxies are slightly fainter than average, and the TF residual is virtually independent of half-light radius, contrary to the trend expected for gravitationally dominant disks. The observed residual correlations do not account for most of the intrinsic scatter, implying that this scatter is instead driven largely by variations in the ratio of dark to luminous matter within the disk galaxy population.

    Original languageEnglish (US)
    Pages (from-to)945-972
    Number of pages28
    JournalAstronomical Journal
    Volume134
    Issue number3
    DOIs
    StatePublished - Sep 2007

    Fingerprint

    Tully-Fisher relation
    galaxies
    outlier
    observatory
    spectroscopy
    slopes
    radii
    distribution
    disk galaxies
    galactic evolution
    curves
    normal density functions
    inclination
    slits
    observatories
    luminosity
    trends
    color

    Keywords

    • Galaxies: kinematics and dynamics
    • Galaxies: structure

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Pizagno, J., Prada, F., Weinberg, D. H., Hans-Walter, R. I. X., Pogge, R. W., Grebel, E. K., ... Gunn, J. E. (2007). The tully-fisher relation and its residuals for a broadly selected sample of galaxies. Astronomical Journal, 134(3), 945-972. https://doi.org/10.1086/519522

    The tully-fisher relation and its residuals for a broadly selected sample of galaxies. / Pizagno, James; Prada, Francisco; Weinberg, David H.; Hans-Walter, R. I X; Pogge, Richard W.; Grebel, Eva K.; Harbeck, Daniel; Blanton, Michael; Brinkmann, J.; Gunn, James E.

    In: Astronomical Journal, Vol. 134, No. 3, 09.2007, p. 945-972.

    Research output: Contribution to journalArticle

    Pizagno, J, Prada, F, Weinberg, DH, Hans-Walter, RIX, Pogge, RW, Grebel, EK, Harbeck, D, Blanton, M, Brinkmann, J & Gunn, JE 2007, 'The tully-fisher relation and its residuals for a broadly selected sample of galaxies', Astronomical Journal, vol. 134, no. 3, pp. 945-972. https://doi.org/10.1086/519522
    Pizagno J, Prada F, Weinberg DH, Hans-Walter RIX, Pogge RW, Grebel EK et al. The tully-fisher relation and its residuals for a broadly selected sample of galaxies. Astronomical Journal. 2007 Sep;134(3):945-972. https://doi.org/10.1086/519522
    Pizagno, James ; Prada, Francisco ; Weinberg, David H. ; Hans-Walter, R. I X ; Pogge, Richard W. ; Grebel, Eva K. ; Harbeck, Daniel ; Blanton, Michael ; Brinkmann, J. ; Gunn, James E. / The tully-fisher relation and its residuals for a broadly selected sample of galaxies. In: Astronomical Journal. 2007 ; Vol. 134, No. 3. pp. 945-972.
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