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Title: The stellar halo of isolated central galaxies in the Hyper Suprime-Cam imaging survey

Abstract

We study the faint stellar halo of isolated central galaxies, by stacking galaxy images in the HSC survey and accounting for the residual sky background sampled with random points. The surface brightness profiles in HSC r band are measured for a wide range of galaxy stellar masses (9.2 < log 10M */M < 11.4) and out to 120 kpc. Failing to account for the stellar halo below the noise level of individual images will lead to underestimates of the total luminosity by ≤15%. Splitting galaxies according to the concentration parameter of their light distributions, we find that the surface brightness profiles of low-concentration galaxies drop faster between 20 and 100 kpc than those of high-concentration galaxies. Albeit the large galaxy-to-galaxy scatter, we find a strong self-similarity of the stellar halo profiles. They show unified forms once the projected distance is scaled by the halo virial radius. The colour of galaxies is redder in the centre and bluer outside, with high-concentration galaxies having redder and more flattened colour profiles. There are indications of a colour minimum, beyond which the colour of the outer stellar halo turns red again. This colour minimum, however, is very sensitive to the completeness in maskingmore » satellite galaxies. We also examine the effect of the extended PSF in the measurement of the stellar halo, which is particularly important for low-mass or low-concentration galaxies. The PSF-corrected surface brightness profile can be measured down to ~31 magarcsec -2 at 3σ significance. PSF also slightly flattens the measured colour profiles.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3];  [1]; ORCiD logo [1];  [4];  [5];  [6];  [6];  [7];  [1];  [1];  [1]; ORCiD logo [8];  [1];  [6];  [9]
  1. Univ. of Tokyo, Kashiwa (Japan)
  2. Shanghai Jiao Tong Univ., Shanghai (China); Univ. of Tokyo, Kashiwa (Japan)
  3. Leiden Univ. (Netherlands); Univ. of Tokyo, Kashiwa (Japan)
  4. Shanghai Jiao Tong Univ., Shanghai (China)
  5. Inter-Univ. Centre for Astronomy and Astrophysics, Ganeshkhind (India); Univ. of Tokyo, Kashiwa (Japan)
  6. Princeton Univ., NJ (United States)
  7. Stanford Univ., CA (United States)
  8. Univ. of California, Santa Cruz, CA (United States)
  9. National Astronomical Observatory of Japan, Tokyo (Japan); Graduate University for Advanced Studies (SOKENDAI), Tokyo (Japan)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1546792
Grant/Contract Number:  
AC02-76SF00515; JP17K14271
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 487; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Galaxy: halo; dark matter

Citation Formats

Wang, Wenting, Han, Jiaxin, Sonnenfeld, Alessandro, Yasuda, Naoki, Li, Xiangchong, Jing, Yipeng, More, Surhud, Price, Paul A., Lupton, Robert, Rykoff, Eli S., Stark, David V., Lan, Ting-Wen, Takada, Masahiro, Huang, Song, Luo, Wentao, Bahcall, Neta A., and Komiyama, Yutaka. The stellar halo of isolated central galaxies in the Hyper Suprime-Cam imaging survey. United States: N. p., 2019. Web. doi:10.1093/mnras/stz1339.
Wang, Wenting, Han, Jiaxin, Sonnenfeld, Alessandro, Yasuda, Naoki, Li, Xiangchong, Jing, Yipeng, More, Surhud, Price, Paul A., Lupton, Robert, Rykoff, Eli S., Stark, David V., Lan, Ting-Wen, Takada, Masahiro, Huang, Song, Luo, Wentao, Bahcall, Neta A., & Komiyama, Yutaka. The stellar halo of isolated central galaxies in the Hyper Suprime-Cam imaging survey. United States. doi:10.1093/mnras/stz1339.
Wang, Wenting, Han, Jiaxin, Sonnenfeld, Alessandro, Yasuda, Naoki, Li, Xiangchong, Jing, Yipeng, More, Surhud, Price, Paul A., Lupton, Robert, Rykoff, Eli S., Stark, David V., Lan, Ting-Wen, Takada, Masahiro, Huang, Song, Luo, Wentao, Bahcall, Neta A., and Komiyama, Yutaka. Thu . "The stellar halo of isolated central galaxies in the Hyper Suprime-Cam imaging survey". United States. doi:10.1093/mnras/stz1339.
@article{osti_1546792,
title = {The stellar halo of isolated central galaxies in the Hyper Suprime-Cam imaging survey},
author = {Wang, Wenting and Han, Jiaxin and Sonnenfeld, Alessandro and Yasuda, Naoki and Li, Xiangchong and Jing, Yipeng and More, Surhud and Price, Paul A. and Lupton, Robert and Rykoff, Eli S. and Stark, David V. and Lan, Ting-Wen and Takada, Masahiro and Huang, Song and Luo, Wentao and Bahcall, Neta A. and Komiyama, Yutaka},
abstractNote = {We study the faint stellar halo of isolated central galaxies, by stacking galaxy images in the HSC survey and accounting for the residual sky background sampled with random points. The surface brightness profiles in HSC r band are measured for a wide range of galaxy stellar masses (9.2 < log10M*/M⊙ < 11.4) and out to 120 kpc. Failing to account for the stellar halo below the noise level of individual images will lead to underestimates of the total luminosity by ≤15%. Splitting galaxies according to the concentration parameter of their light distributions, we find that the surface brightness profiles of low-concentration galaxies drop faster between 20 and 100 kpc than those of high-concentration galaxies. Albeit the large galaxy-to-galaxy scatter, we find a strong self-similarity of the stellar halo profiles. They show unified forms once the projected distance is scaled by the halo virial radius. The colour of galaxies is redder in the centre and bluer outside, with high-concentration galaxies having redder and more flattened colour profiles. There are indications of a colour minimum, beyond which the colour of the outer stellar halo turns red again. This colour minimum, however, is very sensitive to the completeness in masking satellite galaxies. We also examine the effect of the extended PSF in the measurement of the stellar halo, which is particularly important for low-mass or low-concentration galaxies. The PSF-corrected surface brightness profile can be measured down to ~31 magarcsec-2 at 3σ significance. PSF also slightly flattens the measured colour profiles.},
doi = {10.1093/mnras/stz1339},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 487,
place = {United States},
year = {2019},
month = {5}
}

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