تقرير
The (dark) halo-to-stellar mass ratio in the Spitzer Survey of Stellar Structure in Galaxies (S$^4$G)
| العنوان: | The (dark) halo-to-stellar mass ratio in the Spitzer Survey of Stellar Structure in Galaxies (S$^4$G) |
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| المؤلفون: | Díaz-García, Simón, Salo, Heikki, Laurikainen, Eija, Leaman, Ryan |
| سنة النشر: | 2016 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We use 3.6 $\mu$m photometry for 1154 disk galaxies ($i<65^{\circ}$) in the Spitzer Survey of Stellar Structure in Galaxies (S$^{4}$G, Sheth et al. 2010) to obtain the stellar component of the circular velocity. By combining the disk+bulge rotation curves with HI line width measurements from the literature, we estimate the ratio of the halo-to-stellar mass ($M_{\rm halo}/M_{\ast}$) within the optical disk, and compare it to the total stellar mass ($M_{\ast}$). We find the $M_{\rm halo}/M_{\ast}$-$M_{\ast}$ relation in good agreement with the best-fit model at z$\approx$0 in $\Lambda$CDM cosmological simulations (e.g. Moster et al. 2010), assuming that the dark matter halo within the optical radius comprises a constant fraction ($\sim4\%$) of its total mass. Comment: 6 pages, 2 figures, proceedings of the XII Scientific Meeting of the Spanish Astronomical Society held on July 18-22, 2016, in Bilbao, Spain. F. Figueras, A. S\'anchez-Lavega, S. P\'erez-Hoyos, A. Alonso Herrero, S. Arribas, C. Hern\'andez Monteagudo (eds.) |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1611.01844 |
| رقم الأكسشن: | edsarx.1611.01844 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |