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ZFIRE : similar stellar growth in Hα-emitting cluster and field galaxies at z ∼ 2

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Abstract
We compare galaxy scaling relations as a function of environment at z similar to 2 with our ZFIRE survey(12) where we have measured Ha fluxes for 90 star-forming galaxies selected from a mass-limited (log(M-star/M-circle dot) > 9) sample based on ZFOURGE.(13) The cluster galaxies (37) are part of a confirmed system at z = 2.095 and the field galaxies (53) are at 1.9 < z < 2.4; all are in the COSMOS legacy field. There is no statistical difference between H alpha-emitting cluster and field populations when comparing their star formation rate (SFR), stellar mass (M-star), galaxy size (r(eff)), SFR surface density (Sigma(H alpha(star))), and stellar age distributions. The only difference is that at fixed stellar mass, the Ha-emitting cluster galaxies are log(r(eff)) similar to 0.1 larger than in the field. Approximately 19% of the Ha emitters in the cluster and 26% in the field are IR-luminous (L-IR > 2 x 10(11) L-circle dot). Because the luminous IR galaxies in our combined sample are similar to 5 times more massive than the low-IR galaxies, their radii are similar to 70% larger. To track stellar growth, we separate galaxies into those that lie above, on, or below the Ha star-forming main sequence (SFMS) using Delta SFR(M-star) = +/- 0.2 dex. Galaxies above the SFMS (starbursts) tend to have higher Ha SFR surface densities and younger light-weighted stellar ages than galaxies below the SFMS. Our results indicate that starbursts (+SFMS) in the cluster and field at z similar to 2 are growing their stellar cores. Lastly, we compare to the (SFR-M-star) relation from RHAPSODY-G cluster simulations and find that the predicted slope is nominally consistent with the observations. However, the predicted cluster SFRs tend to be too low by a factor of similar to 2, which seems to be a common problem for simulations across environment.
Keywords
STAR-FORMING GALAXIES, HUBBLE-SPACE-TELESCOPE, LUMINOUS INFRARED, GALAXIES, FORMATION-DENSITY RELATION, MASS-METALLICITY RELATION, FORMATION RATES, MOSDEF SURVEY, SPECTROSCOPIC SURVEY, QUIESCENT, GALAXIES, DUST ATTENUATION, galaxies: evolution, galaxies: starburst, galaxies: star formation

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MLA
Tran, Kim-Vy H, Leo Y Alcorn, Glenn G Kacprzak, et al. “ZFIRE : Similar Stellar Growth in Hα-emitting Cluster and Field Galaxies at z ∼ 2.” ASTROPHYSICAL JOURNAL 834.2 (2017): n. pag. Print.
APA
Tran, K.-V. H., Alcorn, L. Y., Kacprzak, G. G., Nanayakkara, T., Straatman, C., Yuan, T., Cowley, M., et al. (2017). ZFIRE : similar stellar growth in Hα-emitting cluster and field galaxies at z ∼ 2. ASTROPHYSICAL JOURNAL, 834(2).
Chicago author-date
Tran, Kim-Vy H, Leo Y Alcorn, Glenn G Kacprzak, Themiya Nanayakkara, Caroline Straatman, Tiantian Yuan, Michael Cowley, et al. 2017. “ZFIRE : Similar Stellar Growth in Hα-emitting Cluster and Field Galaxies at z ∼ 2.” Astrophysical Journal 834 (2).
Chicago author-date (all authors)
Tran, Kim-Vy H, Leo Y Alcorn, Glenn G Kacprzak, Themiya Nanayakkara, Caroline Straatman, Tiantian Yuan, Michael Cowley, Romeel Dave, Karl Glazebrook, Lisa J Kewley, Ivo Labbe, Davide Martizzi, Casey Papovich, Ryan Quadri, Lee R Spitler, and Adam Tomczak. 2017. “ZFIRE : Similar Stellar Growth in Hα-emitting Cluster and Field Galaxies at z ∼ 2.” Astrophysical Journal 834 (2).
Vancouver
1.
Tran K-VH, Alcorn LY, Kacprzak GG, Nanayakkara T, Straatman C, Yuan T, et al. ZFIRE : similar stellar growth in Hα-emitting cluster and field galaxies at z ∼ 2. ASTROPHYSICAL JOURNAL. 2017;834(2).
IEEE
[1]
K.-V. H. Tran et al., “ZFIRE : similar stellar growth in Hα-emitting cluster and field galaxies at z ∼ 2,” ASTROPHYSICAL JOURNAL, vol. 834, no. 2, 2017.
@article{8582604,
  abstract     = {We compare galaxy scaling relations as a function of environment at z similar to 2 with our ZFIRE survey(12) where we have measured Ha fluxes for 90 star-forming galaxies selected from a mass-limited (log(M-star/M-circle dot) > 9) sample based on ZFOURGE.(13) The cluster galaxies (37) are part of a confirmed system at z = 2.095 and the field galaxies (53) are at 1.9 < z < 2.4; all are in the COSMOS legacy field. There is no statistical difference between H alpha-emitting cluster and field populations when comparing their star formation rate (SFR), stellar mass (M-star), galaxy size (r(eff)), SFR surface density (Sigma(H alpha(star))), and stellar age distributions. The only difference is that at fixed stellar mass, the Ha-emitting cluster galaxies are log(r(eff)) similar to 0.1 larger than in the field. Approximately 19% of the Ha emitters in the cluster and 26% in the field are IR-luminous (L-IR > 2 x 10(11) L-circle dot). Because the luminous IR galaxies in our combined sample are similar to 5 times more massive than the low-IR galaxies, their radii are similar to 70% larger. To track stellar growth, we separate galaxies into those that lie above, on, or below the Ha star-forming main sequence (SFMS) using Delta SFR(M-star) = +/- 0.2 dex. Galaxies above the SFMS (starbursts) tend to have higher Ha SFR surface densities and younger light-weighted stellar ages than galaxies below the SFMS. Our results indicate that starbursts (+SFMS) in the cluster and field at z similar to 2 are growing their stellar cores. Lastly, we compare to the (SFR-M-star) relation from RHAPSODY-G cluster simulations and find that the predicted slope is nominally consistent with the observations. However, the predicted cluster SFRs tend to be too low by a factor of similar to 2, which seems to be a common problem for simulations across environment.},
  articleno    = {101},
  author       = {Tran, Kim-Vy H and Alcorn, Leo Y and Kacprzak, Glenn G and Nanayakkara, Themiya and Straatman, Caroline and Yuan, Tiantian and Cowley, Michael and Dave, Romeel and Glazebrook, Karl and Kewley, Lisa J and Labbe, Ivo and Martizzi, Davide and Papovich, Casey and Quadri, Ryan and Spitler, Lee R and Tomczak, Adam},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {STAR-FORMING GALAXIES,HUBBLE-SPACE-TELESCOPE,LUMINOUS INFRARED,GALAXIES,FORMATION-DENSITY RELATION,MASS-METALLICITY RELATION,FORMATION RATES,MOSDEF SURVEY,SPECTROSCOPIC SURVEY,QUIESCENT,GALAXIES,DUST ATTENUATION,galaxies: evolution,galaxies: starburst,galaxies: star formation},
  language     = {eng},
  number       = {2},
  pages        = {14},
  title        = {ZFIRE : similar stellar growth in Hα-emitting cluster and field galaxies at z ∼ 2},
  url          = {http://dx.doi.org/10.3847/1538-4357/834/2/101},
  volume       = {834},
  year         = {2017},
}

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