%0 Generic %1 huang2017individual %A Huang, Song %A Leauthaud, Alexie %A Greene, Jenny %A Bundy, Kevin %A Lin, Yen-Ting %A Tanaka, Masayuki %A Miyazaki, Satoshi %A Komiyama, Yutaka %D 2017 %K galaxies halos massive stellar %T Individual Stellar Halos of Massive Galaxies Measured to 100 kpc at $0.3<z<0.5$ using Hyper Suprime-Cam %U http://arxiv.org/abs/1707.01904 %X Massive galaxies display extended light profiles that can reach several hundreds of kilo parsecs. These stellar halos provide a fossil record of galaxy assembly histories. Using data that is both wide (~100 square degree) and deep (i>28.5 mag/arcsec^2 in i-band), we present a systematic study of the stellar halos of a sample of more than 3000 galaxies at 0.3 < z < 0.5 with $łog M_\star/M_ødot > 11.4$. Our study is based on high-quality (0.6 arcsec seeing) imaging data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP), which enables us to individually estimate surface mass density profiles to 100 kpc without stacking. As in previous work, we find that more massive galaxies exhibit more extended outer profiles. When this extended light is not properly accounted for as a result of shallow imaging or inadequate profile modeling, the derived stellar mass function can be significantly underestimated at the highest masses. Across our sample, the ellipticity of outer light profiles increases substantially as we probe larger radii. We show for the first time that these ellipticity gradients steepen dramatically as a function of galaxy mass, but we detect no mass-dependence in outer color gradients. Our results support the two-phase formation scenario for massive galaxies in which outer envelopes are built up at late times from a series of merging events. We provide surface mass surface mass density profiles in a convenient tabulated format to facilitate comparisons with predictions from numerical simulations of galaxy formation.

@misc{huang2017individual, abstract = {Massive galaxies display extended light profiles that can reach several hundreds of kilo parsecs. These stellar halos provide a fossil record of galaxy assembly histories. Using data that is both wide (~100 square degree) and deep (i>28.5 mag/arcsec^2 in i-band), we present a systematic study of the stellar halos of a sample of more than 3000 galaxies at 0.3 < z < 0.5 with $\log M_{\star}/M_{\odot} > 11.4$. Our study is based on high-quality (0.6 arcsec seeing) imaging data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP), which enables us to individually estimate surface mass density profiles to 100 kpc without stacking. As in previous work, we find that more massive galaxies exhibit more extended outer profiles. When this extended light is not properly accounted for as a result of shallow imaging or inadequate profile modeling, the derived stellar mass function can be significantly underestimated at the highest masses. Across our sample, the ellipticity of outer light profiles increases substantially as we probe larger radii. We show for the first time that these ellipticity gradients steepen dramatically as a function of galaxy mass, but we detect no mass-dependence in outer color gradients. Our results support the two-phase formation scenario for massive galaxies in which outer envelopes are built up at late times from a series of merging events. We provide surface mass surface mass density profiles in a convenient tabulated format to facilitate comparisons with predictions from numerical simulations of galaxy formation.}, added-at = {2017-07-10T10:32:22.000+0200}, author = {Huang, Song and Leauthaud, Alexie and Greene, Jenny and Bundy, Kevin and Lin, Yen-Ting and Tanaka, Masayuki and Miyazaki, Satoshi and Komiyama, Yutaka}, biburl = {https://www.bibsonomy.org/bibtex/2a10ab06318cfc9a23c7e5fef88831aff/miki}, description = {[1707.01904] Individual Stellar Halos of Massive Galaxies Measured to 100 kpc at $0.3&lt;z&lt;0.5$ using Hyper Suprime-Cam}, interhash = {b027dd599ac8f430d58b9a5f87241ee2}, intrahash = {a10ab06318cfc9a23c7e5fef88831aff}, keywords = {galaxies halos massive stellar}, note = {cite arxiv:1707.01904Comment: Submitted to ApJ; 23 pages, 8 figures, 2 appendix; Data will be made available here: http://massivegalaxies.com/ once the paper is published}, timestamp = {2017-07-10T10:32:22.000+0200}, title = {Individual Stellar Halos of Massive Galaxies Measured to 100 kpc at $0.3<z<0.5$ using Hyper Suprime-Cam}, url = {http://arxiv.org/abs/1707.01904}, year = 2017 }