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Abstract
The assembly of galaxies can be described by the distribution of their star formation as a function of cosmic time. Thanks to the WFC3 grism on the Hubble Space Telescope (HST) it is now possible to measure this beyond the local Universe. Here we present the spatial distribution of H alpha emission for a sample of 54 strongly star-forming galaxies at z similar to 1 in the 3D-HST Treasury survey. By stacking the H alpha emission, we find that star formation occurred in approximately exponential distributions at z similar to 1, with a median Sersic index of n = 1.0 +/- 0.2. The stacks are elongated with median axis ratios of b/a = 0.58 +/- 0.09 in H alpha consistent with (possibly thick) disks at random orientation angles. Keck spectra obtained for a subset of eight of the galaxies show clear evidence for rotation, with inclination corrected velocities of 90-330 km s(-1). The most straightforward interpretation of our results is that star formation in strongly star-forming galaxies at z similar to 1 generally occurred in disks. The disks appear to be "scaled-up" versions of nearby spiral galaxies: they have EW(H alpha) similar to 100 angstrom out to the solar orbit and they have star formation surface densities above the threshold for driving galactic scale winds.
Keywords
INTEGRAL FIELD SPECTROSCOPY, GREATER-THAN 1, MASSIVE GALAXIES, FORMING, GALAXIES, SINS SURVEY, MILKY-WAY, KINEMATICS, DISKS, EVOLUTION, DYNAMICS, galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: kinematics and dynamics, galaxies: star formation, galaxies: structure

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MLA
Nelson, Erica June, Pieter G van Dokkum, Ivelina Momcheva, et al. “The Radial Distribution of Star Formation in Galaxies at z ∼ 1 from the 3D-HST Survey.” ASTROPHYSICAL JOURNAL LETTERS 763.1 (2013): n. pag. Print.
APA
Nelson, E. J., van Dokkum, P. G., Momcheva, I., Brammer, G., Lundgren, B., Skelton, R. E., Whitaker, K. E., et al. (2013). The radial distribution of star formation in galaxies at z ∼ 1 from the 3D-HST Survey. ASTROPHYSICAL JOURNAL LETTERS, 763(1).
Chicago author-date
Nelson, Erica June, Pieter G van Dokkum, Ivelina Momcheva, Gabriel Brammer, Britt Lundgren, Rosalind E Skelton, Katherine E Whitaker, et al. 2013. “The Radial Distribution of Star Formation in Galaxies at z ∼ 1 from the 3D-HST Survey.” Astrophysical Journal Letters 763 (1).
Chicago author-date (all authors)
Nelson, Erica June, Pieter G van Dokkum, Ivelina Momcheva, Gabriel Brammer, Britt Lundgren, Rosalind E Skelton, Katherine E Whitaker, Elisabete Da Cunha, Natascha Foerster Schreiber, Marijn Franx, Mattia Fumagalli, Mariska Kriek, Ivo Labbe, Joel Leja, Shannon Patel, Hans-Walter Rix, Kasper B Schmidt, Arjen van der Wel, and Stijn Wuyts. 2013. “The Radial Distribution of Star Formation in Galaxies at z ∼ 1 from the 3D-HST Survey.” Astrophysical Journal Letters 763 (1).
Vancouver
1.
Nelson EJ, van Dokkum PG, Momcheva I, Brammer G, Lundgren B, Skelton RE, et al. The radial distribution of star formation in galaxies at z ∼ 1 from the 3D-HST Survey. ASTROPHYSICAL JOURNAL LETTERS. 2013;763(1).
IEEE
[1]
E. J. Nelson et al., “The radial distribution of star formation in galaxies at z ∼ 1 from the 3D-HST Survey,” ASTROPHYSICAL JOURNAL LETTERS, vol. 763, no. 1, 2013.
@article{8573017,
  abstract     = {The assembly of galaxies can be described by the distribution of their star formation as a function of cosmic time. Thanks to the WFC3 grism on the Hubble Space Telescope (HST) it is now possible to measure this beyond the local Universe. Here we present the spatial distribution of H alpha emission for a sample of 54 strongly star-forming galaxies at z similar to 1 in the 3D-HST Treasury survey. By stacking the H alpha emission, we find that star formation occurred in approximately exponential distributions at z similar to 1, with a median Sersic index of n = 1.0 +/- 0.2. The stacks are elongated with median axis ratios of b/a = 0.58 +/- 0.09 in H alpha consistent with (possibly thick) disks at random orientation angles. Keck spectra obtained for a subset of eight of the galaxies show clear evidence for rotation, with inclination corrected velocities of 90-330 km s(-1). The most straightforward interpretation of our results is that star formation in strongly star-forming galaxies at z similar to 1 generally occurred in disks. The disks appear to be "scaled-up" versions of nearby spiral galaxies: they have EW(H alpha) similar to 100 angstrom out to the solar orbit and they have star formation surface densities above the threshold for driving galactic scale winds.},
  articleno    = {L16},
  author       = {Nelson, Erica June and van Dokkum, Pieter G and Momcheva, Ivelina and Brammer, Gabriel and Lundgren, Britt and Skelton, Rosalind E and Whitaker, Katherine E and Da Cunha, Elisabete and Schreiber, Natascha Foerster and Franx, Marijn and Fumagalli, Mattia and Kriek, Mariska and Labbe, Ivo and Leja, Joel and Patel, Shannon and Rix, Hans-Walter and Schmidt, Kasper B and van der Wel, Arjen and Wuyts, Stijn},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keywords     = {INTEGRAL FIELD SPECTROSCOPY,GREATER-THAN 1,MASSIVE GALAXIES,FORMING,GALAXIES,SINS SURVEY,MILKY-WAY,KINEMATICS,DISKS,EVOLUTION,DYNAMICS,galaxies: evolution,galaxies: formation,galaxies: high-redshift,galaxies: kinematics and dynamics,galaxies: star formation,galaxies: structure},
  language     = {eng},
  number       = {1},
  pages        = {6},
  title        = {The radial distribution of star formation in galaxies at z ∼ 1 from the 3D-HST Survey},
  url          = {http://dx.doi.org/10.1088/2041-8205/763/1/L16},
  volume       = {763},
  year         = {2013},
}

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