تقرير
Non-parametric analysis of the rest-frame UV sizes and morphological disturbance amongst L* galaxies at 4
التفاصيل البيبلوغرافية
العنوان:
Non-parametric analysis of the rest-frame UV sizes and morphological disturbance amongst L* galaxies at 4
المؤلفون:
Curtis-Lake, E., McLure, R. J., Dunlop, J. S., Rogers, A. B., Targett, T., Dekel, A., Ellis, R. S., Faber, S. M., Ferguson, H. C., Grogin, N. A., Kocevski, D. D., Koekemoer, A. M., Lai, K., Mármol-Queraltó, E., Robertson, B. E.
المصدر:
MNRAS, 457, 440-464, 2016
سنة النشر:
2014
المجموعة:
Astrophysics
مصطلحات موضوعية:
Astrophysics - Astrophysics of Galaxies
الوصف:
We present the results of a study investigating the sizes and morphologies of redshift 4 < z < 8 galaxies in the CANDELS GOODS-S, HUDF and HUDF parallel fields. Based on non-parametric measurements and incorporating a careful treatment of measurement biases, we quantify the typical size of galaxies at each redshift as the peak of the log-normal size distribution, rather than the arithmetic mean size. Parameterizing the evolution of galaxy half-light radius as $r_{50} \propto (1+z)^n$, we find $n = -0.20 \pm 0.26$ at bright UV-luminosities ($0.3L_{*(z=3)} < L < L_*$) and $n = -0.47 \pm 0.62$ at faint luminosities ($0.12L_* < L < 0.3L_*$). Furthermore, simulations based on artificially redshifting our z~4 galaxy sample show that we cannot reject the null hypothesis of no size evolution. We show that this result is caused by a combination of the size-dependent completeness of high-redshift galaxy samples and the underestimation of the sizes of the largest galaxies at a given epoch. To explore the evolution of galaxy morphology we first compare asymmetry measurements to those from a large sample of simulated single S\'ersic profiles, in order to robustly categorise galaxies as either `smooth' or `disturbed'. Comparing the disturbed fraction amongst bright ($M_{UV} \leq -20$) galaxies at each redshift to that obtained by artificially redshifting our z~4 galaxy sample, while carefully matching the size and UV-luminosity distributions, we find no clear evidence for evolution in galaxy morphology over the redshift interval 4 < z < 8. Therefore, based on our results, a bright ($M_{UV} \leq -20$) galaxy at z~6 is no more likely to be measured as `disturbed' than a comparable galaxy at z~4, given the current observational constraints.
Comment: 29 pages, 25 figures, 4 tables, published in MNRAS
نوع الوثيقة:
Working Paper
DOI:
10.1093/mnras/stv3017
URL الوصول:
http://arxiv.org/abs/1409.1832
رقم الأكسشن:
edsarx.1409.1832
قاعدة البيانات:
arXiv
| العنوان: | Non-parametric analysis of the rest-frame UV sizes and morphological disturbance amongst L* galaxies at 4 |
|---|---|
| المؤلفون: | Curtis-Lake, E., McLure, R. J., Dunlop, J. S., Rogers, A. B., Targett, T., Dekel, A., Ellis, R. S., Faber, S. M., Ferguson, H. C., Grogin, N. A., Kocevski, D. D., Koekemoer, A. M., Lai, K., Mármol-Queraltó, E., Robertson, B. E. |
| المصدر: | MNRAS, 457, 440-464, 2016 |
| سنة النشر: | 2014 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present the results of a study investigating the sizes and morphologies of redshift 4 < z < 8 galaxies in the CANDELS GOODS-S, HUDF and HUDF parallel fields. Based on non-parametric measurements and incorporating a careful treatment of measurement biases, we quantify the typical size of galaxies at each redshift as the peak of the log-normal size distribution, rather than the arithmetic mean size. Parameterizing the evolution of galaxy half-light radius as $r_{50} \propto (1+z)^n$, we find $n = -0.20 \pm 0.26$ at bright UV-luminosities ($0.3L_{*(z=3)} < L < L_*$) and $n = -0.47 \pm 0.62$ at faint luminosities ($0.12L_* < L < 0.3L_*$). Furthermore, simulations based on artificially redshifting our z~4 galaxy sample show that we cannot reject the null hypothesis of no size evolution. We show that this result is caused by a combination of the size-dependent completeness of high-redshift galaxy samples and the underestimation of the sizes of the largest galaxies at a given epoch. To explore the evolution of galaxy morphology we first compare asymmetry measurements to those from a large sample of simulated single S\'ersic profiles, in order to robustly categorise galaxies as either `smooth' or `disturbed'. Comparing the disturbed fraction amongst bright ($M_{UV} \leq -20$) galaxies at each redshift to that obtained by artificially redshifting our z~4 galaxy sample, while carefully matching the size and UV-luminosity distributions, we find no clear evidence for evolution in galaxy morphology over the redshift interval 4 < z < 8. Therefore, based on our results, a bright ($M_{UV} \leq -20$) galaxy at z~6 is no more likely to be measured as `disturbed' than a comparable galaxy at z~4, given the current observational constraints. Comment: 29 pages, 25 figures, 4 tables, published in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stv3017 |
| URL الوصول: | http://arxiv.org/abs/1409.1832 |
| رقم الأكسشن: | edsarx.1409.1832 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stv3017 |
|---|