تقرير
Galaxy and Mass Assembly (GAMA): Small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies
| العنوان: | Galaxy and Mass Assembly (GAMA): Small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies |
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| المؤلفون: | Loveday, J., Christodoulou, L., Norberg, P., Peacock, J. A., Baldry, I. K., Bland-Hawthorn, J., Brown, M. J. I., Colless, M., Driver, S. P., Holwerda, B. W., Hopkins, A. M., Kafle, P. R., Liske, J., Lopez-Sanchez, A. R., Taylor, E. N. |
| سنة النشر: | 2017 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | The galaxy pairwise velocity dispersion (PVD) can provide important tests of non-standard gravity and galaxy formation models. We describe measurements of the PVD of galaxies in the Galaxy and Mass Assembly (GAMA) survey as a function of projected separation and galaxy luminosity. Due to the faint magnitude limit ($r < 19.8$) and highly-complete spectroscopic sampling of the GAMA survey, we are able to reliably measure the PVD to smaller scales ($r_\bot = 0.01$ Mpc/h) than previous work. The measured PVD at projected separations $r_\bot <~ 1$ Mpc/h increases near-monotonically with increasing luminosity from $\sigma \approx 200$ km/s at $M_r = -17$ mag to $\sigma \approx 600$ km/s at $M_r \approx -22$ mag. Analysis of the Gonzalez-Perez (2014) GALFORM semi-analytic model yields no such trend of PVD with luminosity: the model over-predicts the PVD for faint galaxies. This is most likely a result of the model placing too many low-luminosity galaxies in massive halos. Comment: Accepted for publication in MNRAS, 17 pages |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stx2971 |
| URL الوصول: | http://arxiv.org/abs/1711.05636 |
| رقم الأكسشن: | edsarx.1711.05636 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stx2971 |
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