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Where stars form : inside-out growth and coherent star formation from HST Hα maps of 3200 galaxies across the main sequence at 0.7 < z < 1.5

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Abstract
We present H alpha maps at 1 kpc spatial resolution for star-forming galaxies at z similar to 1, made possible by the Wide Field Camera 3 grism on Hubble Space Telescope (HST). Employing this capability over all five 3D-HST/CANDELS fields provides a sample of 3200 galaxies enabling a division into subsamples based on stellar mass and star formation rate (SFR). By creating deep stacked H alpha images, we reach surface brightness limits of 1 x 10(-18) erg s(-1) cm(-2) arc sec(-2), allowing us to map the distribution of ionized gas to similar to 10 kpc for typical L* galaxies at this epoch. We find that the spatial extent of the H alpha distribution increases with stellar mass as r(H alpha) = 1.5(M-*/10(10) M-circle dot)(0.23) kpc. The H alpha emission is more extended than the stellar continuum emission, consistent with inside-out assembly of galactic disks. This effect grows stronger with mass as r(H alpha)/r(*) = 1.1(M-*/10(10) M-circle dot)(0.054). We map the H alpha distribution as a function of SFR(IR+UV) and find evidence for "coherent star formation" across the SFR-M-* plane: above the main sequence (MS), H alpha is enhanced at all radii; below the MS, H alpha is depressed at all radii. This suggests that at all masses the physical processes driving the enhancement or suppression of star formation act throughout the disks of galaxies. At high masses (10(10.5) < M-*/M-circle dot < 10(11)), above the MS, H alpha is particularly enhanced in the center, potentially building bulges and/or supermassive black holes. Below the MS, a strong central dip in the EW(H alpha), as well as. the inferred specific SFR, appears. Importantly, though, across the entirety of the SFR-M-* plane, the absolute SFR as traced by H alpha is always centrally peaked, even in galaxies below the MS.
Keywords
SIMILAR-TO 2, HUBBLE-SPACE-TELESCOPE, SINS/ZC-SINF SURVEY, INTEGRAL, FIELD SPECTROSCOPY, LYMAN BREAK GALAXIES, ULTRA-DEEP FIELD, EXTRAGALACTIC LEGACY SURVEY, COMPACT QUIESCENT GALAXIES, MASS-METALLICITY RELATION, KILOPARSEC-SCALE CLUMPS, galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: star formation, galaxies: structure

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MLA
Nelson, Erica June et al. “Where Stars Form : Inside-out Growth and Coherent Star Formation from HST Hα Maps of 3200 Galaxies Across the Main Sequence at 0.7 < z < 1.5.” ASTROPHYSICAL JOURNAL 828.1 (2016): n. pag. Print.
APA
Nelson, E. J., van Dokkum, P. G., Foerster Schreiber, N. M., Franx, M., Brammer, G. B., Momcheva, I. G., Wuyts, S., et al. (2016). Where stars form : inside-out growth and coherent star formation from HST Hα maps of 3200 galaxies across the main sequence at 0.7 < z < 1.5. ASTROPHYSICAL JOURNAL, 828(1).
Chicago author-date
Nelson, Erica June, Pieter G van Dokkum, Natascha M Foerster Schreiber, Marijn Franx, Gabriel B Brammer, Ivelina G Momcheva, Stijn Wuyts, et al. 2016. “Where Stars Form : Inside-out Growth and Coherent Star Formation from HST Hα Maps of 3200 Galaxies Across the Main Sequence at 0.7 < z < 1.5.” Astrophysical Journal 828 (1).
Chicago author-date (all authors)
Nelson, Erica June, Pieter G van Dokkum, Natascha M Foerster Schreiber, Marijn Franx, Gabriel B Brammer, Ivelina G Momcheva, Stijn Wuyts, Katherine E Whitaker, Rosalind E Skelton, Mattia Fumagalli, Christopher C Hayward, Mariska Kriek, Ivo Labbe, Joel Leja, Hans-Walter Rix, Linda J Tacconi, Arjen van der Wel, Frank C van den Bosch, Pascal A Oesch, Claire Dickey, and Johannes Ulf Lange. 2016. “Where Stars Form : Inside-out Growth and Coherent Star Formation from HST Hα Maps of 3200 Galaxies Across the Main Sequence at 0.7 < z < 1.5.” Astrophysical Journal 828 (1).
Vancouver
1.
Nelson EJ, van Dokkum PG, Foerster Schreiber NM, Franx M, Brammer GB, Momcheva IG, et al. Where stars form : inside-out growth and coherent star formation from HST Hα maps of 3200 galaxies across the main sequence at 0.7 < z < 1.5. ASTROPHYSICAL JOURNAL. 2016;828(1).
IEEE
[1]
E. J. Nelson et al., “Where stars form : inside-out growth and coherent star formation from HST Hα maps of 3200 galaxies across the main sequence at 0.7 < z < 1.5,” ASTROPHYSICAL JOURNAL, vol. 828, no. 1, 2016.
@article{8567786,
  abstract     = {We present H alpha maps at 1 kpc spatial resolution for star-forming galaxies at z similar to 1, made possible by the Wide Field Camera 3 grism on Hubble Space Telescope (HST). Employing this capability over all five 3D-HST/CANDELS fields provides a sample of 3200 galaxies enabling a division into subsamples based on stellar mass and star formation rate (SFR). By creating deep stacked H alpha images, we reach surface brightness limits of 1 x 10(-18) erg s(-1) cm(-2) arc sec(-2), allowing us to map the distribution of ionized gas to similar to 10 kpc for typical L* galaxies at this epoch. We find that the spatial extent of the H alpha distribution increases with stellar mass as r(H alpha) = 1.5(M-*/10(10) M-circle dot)(0.23) kpc. The H alpha emission is more extended than the stellar continuum emission, consistent with inside-out assembly of galactic disks. This effect grows stronger with mass as r(H alpha)/r(*) = 1.1(M-*/10(10) M-circle dot)(0.054). We map the H alpha distribution as a function of SFR(IR+UV) and find evidence for "coherent star formation" across the SFR-M-* plane: above the main sequence (MS), H alpha is enhanced at all radii; below the MS, H alpha is depressed at all radii. This suggests that at all masses the physical processes driving the enhancement or suppression of star formation act throughout the disks of galaxies. At high masses (10(10.5) < M-*/M-circle dot < 10(11)), above the MS, H alpha is particularly enhanced in the center, potentially building bulges and/or supermassive black holes. Below the MS, a strong central dip in the EW(H alpha), as well as. the inferred specific SFR, appears. Importantly, though, across the entirety of the SFR-M-* plane, the absolute SFR as traced by H alpha is always centrally peaked, even in galaxies below the MS.},
  articleno    = {27},
  author       = {Nelson, Erica June and van Dokkum, Pieter G and Foerster Schreiber, Natascha M and Franx, Marijn and Brammer, Gabriel B and Momcheva, Ivelina G and Wuyts, Stijn and Whitaker, Katherine E and Skelton, Rosalind E and Fumagalli, Mattia and Hayward, Christopher C and Kriek, Mariska and Labbe, Ivo and Leja, Joel and Rix, Hans-Walter and Tacconi, Linda J and van der Wel, Arjen and van den Bosch, Frank C and Oesch, Pascal A and Dickey, Claire and Lange, Johannes Ulf},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {SIMILAR-TO 2,HUBBLE-SPACE-TELESCOPE,SINS/ZC-SINF SURVEY,INTEGRAL,FIELD SPECTROSCOPY,LYMAN BREAK GALAXIES,ULTRA-DEEP FIELD,EXTRAGALACTIC LEGACY SURVEY,COMPACT QUIESCENT GALAXIES,MASS-METALLICITY RELATION,KILOPARSEC-SCALE CLUMPS,galaxies: evolution,galaxies: formation,galaxies: high-redshift,galaxies: star formation,galaxies: structure},
  language     = {eng},
  number       = {1},
  pages        = {24},
  title        = {Where stars form : inside-out growth and coherent star formation from HST Hα maps of 3200 galaxies across the main sequence at 0.7 < z < 1.5},
  url          = {http://dx.doi.org/10.3847/0004-637X/828/1/27},
  volume       = {828},
  year         = {2016},
}

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