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

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [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)
+ Show Author Affiliations

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; JP17K14271
OSTI ID:
1546792
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 2; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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First results from the Dragonfly Telephoto Array: the apparent lack of a stellar halo in the massive spiral galaxy M101 text January 2014
Satellite abundances around bright isolated galaxies II: radial distribution and environmental effects text January 2014
Parametrizing the Stellar Haloes of Galaxies text January 2014
The influence of diffuse scattered light I. The PSF and its role to observations of the edge-on galaxy NGC 5907 text January 2014
Detection of a distinct metal-poor stellar halo in the early-type galaxy NGC 3115 text January 2014
A weak gravitational lensing recalibration of the scaling relations linking the gas properties of dark halos to their mass text January 2015
Strong bimodality in the host halo mass of central galaxies from galaxy-galaxy lensing text January 2015
Diverse Stellar Haloes in Nearby Milky Way-Mass Disc Galaxies text January 2016
Searches for New Milky Way Satellites from the First Two Years of Data of the Subaru/Hyper Suprime-Cam Survey: Discovery of Cetus~III text January 2017
The Hyper Suprime-Cam Software Pipeline text January 2017
An Investigation of intra-cluster light evolution using cosmological hydro-dynamical simulations text January 2018
Gaia Data Release 2: Photometric content and validation text January 2018
A Study of Two Diffuse Dwarf Galaxies in the Field text January 2018
The Outer Stellar Halos of Galaxies: how Radial Merger Mass Deposition, Shells and Streams depend on Infall-Orbit Configurations text January 2018
The mass of the Milky Way from satellite dynamics text January 2018
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Optical and Near-Infrared Color Profiles in Nearby Early-Type Galaxies and The Implied Age and Metallicity Gradients text January 2004
A concise reference to (projected) Sersic R^{1/n} quantities, including Concentration, Profile Slopes, Petrosian indices, and Kron Magnitudes text January 2005
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