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arXiv · 1311.6523

First Galaxy-Galaxy Lensing Measurement of Satellite Halo Mass in the CFHT Stripe-82 Survey

Ran Li·Huanyuan Shan·HouJun Mo·Jean-Paul Kneib·Xiaohu Yang·Wentao Luo·Frank C. van den Bosch·Thomas Erben·Bruno Moraes·Martin Makler
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Abstract

We select satellite galaxies from the galaxy group catalog constructed with the SDSS spectroscopic galaxies and measure the tangential shear around these galaxies with source catalog extracted from CFHT/MegaCam Stripe-82 Survey to constrain the mass of subhalos associated with them. The lensing signal is measured around satellites in groups with masses in the range [10^{13}, 5x10^{14}]h^{-1}M_{sun}, and is found to agree well with theoretical expectation. Fitting the data with a truncated NFW profile, we obtain an average subhalo mass of log M_{sub}= 11.68 \pm 0.67 for satellites whose projected distances to central galaxies are in the range [0.1, 0.3] h^{-1}Mpc, and log M_{sub}= 11.68 \pm 0.76 for satellites with projected halo-centric distance in [0.3, 0.5] h^{-1}Mpc. The best-fit subhalo masses are comparable to the truncated subhalo masses assigned to satellite galaxies using abundance matching and about 5 to 10 times higher than the average stellar mass of the lensing satellite galaxies.

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Ran Li, Huanyuan Shan, HouJun Mo, Jean-Paul Kneib, Xiaohu Yang, Wentao Luo, Frank C. van den Bosch, Thomas Erben, Bruno Moraes, Martin Makler. 2013-12-12. First Galaxy-Galaxy Lensing Measurement of Satellite Halo Mass in the CFHT Stripe-82 Survey. https://doi.org/10.1093/mnras%2Fstt2395

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