BASILISK II. Improved Constraints on the Galaxy-Halo Connection from Satellite Kinematics in SDSS
arXiv:2409.03105 · doi:10.1093/mnras/stae2030
Abstract
Basilisk is a novel Bayesian hierarchical method for inferring the galaxy-halo connection, including its scatter, using the kinematics of satellite galaxies extracted from a redshift survey. In this paper, we introduce crucial improvements, such as updated central and satellite selection, advanced modelling of impurities and interlopers, extending the kinematic modelling to fourth order by including the kurtosis of the line-of-sight velocity distribution, and utilizing satellite abundance as additional constraint. This drastically enhances Basilisk's performance, resulting in an unbiased recovery of the full conditional luminosity function (central and satellite) and with unprecedented precision. After validating Basilisk's performance using realistic mock data, we apply it to the SDSS-DR7 data. The resulting inferences on the galaxy-halo connection are consistent with, but significantly tighter than, previous constraints from galaxy group catalogues, galaxy clustering and galaxy-galaxy lensing. Using full projected phase-space information, Basilisk breaks the mass-anisotropy degeneracy, thus providing precise global constraint on the average orbital velocity anisotropy of satellite galaxies across a wide range of halo masses. Satellite orbits are found to be mildly radially anisotropic, in good agreement with the mean anisotropy for subhaloes in dark matter-only simulations. Thus, we establish Basilisk as a powerful tool that is not only more constraining than other methods on similar volumes of data, but crucially, is also insensitive to halo assembly bias which plagues the commonly used techniques like galaxy clustering and galaxy-galaxy lensing.
25+4 pages, 17+3 figures
References in corpus (35)
- The NumPy array: a structure for efficient numerical computation
- The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
- A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
- Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
- Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
- Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering
- Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
- A universal model for halo concentrations
- Galaxy Groups in the SDSS DR4: II. halo occupation statistics
- Disruption of Dark Matter Substructure: Fact or Fiction?
- Towards a Concordant Model of Halo Occupation Statistics
- Dark Matter Substructure in Numerical Simulations: A Tale of Discreteness Noise, Runaway Instabilities, and Artificial Disruption
- The relation between velocity dispersion and mass in simulated clusters of galaxies: dependence on the tracer and the baryonic physics
- On the efficiency and reliability of cluster mass estimates based on member galaxies
- Splashback in accreting dark matter halos
- Lensing is Low: Cosmology, Galaxy Formation, or New Physics?
- The origin of scatter in the stellar mass - halo mass relation of central galaxies in the EAGLE simulation
- Evolution in the Halo Masses of Isolated Galaxies between z~1 and z~0: From DEEP2 to SDSS
- The virialized mass of dark matter haloes
- Shaken and Stirred: The Milky Way's Dark Substructures
- The universal distribution of halo interlopers in projected phase space. Bias in galaxy cluster concentration and velocity anisotropy?
- Building disc structure and galaxy properties through angular momentum: The DARK SAGE semi-analytic model
- Assessing Colour-dependent Occupation Statistics Inferred from Galaxy Group Catalogues
- Physical properties underlying observed kinematics of satellite galaxies
- Galaxy Cluster Mass Reconstruction Project: II. Quantifying scatter and bias using contrasting mock catalogues
- Spatial Clustering of Dark Matter Halos: Secondary Bias, Neighbor Bias, and the Influence of Massive Neighbors on Halo Properties
- The distribution function of dark matter in massive haloes
- Satellite Kinematics I: A New Method to Constrain the Halo Mass-Luminosity Relation of Central Galaxies
- The nature of assembly bias - I. Clues from a LCDM cosmology
- Galaxy Cluster Mass Reconstruction Project: III. The impact of dynamical substructure on cluster mass estimates
- Massive Dark Matter Halos around Bright Isolated Galaxies in the 2dFGRS
- Color Dependence in the Spatial Distribution of Satellite Galaxies
- Evidence of Galaxy Assembly Bias in SDSS DR7 Galaxy Samples from Count Statistics
- The impact of galaxy selection on the splashback boundaries of galaxy clusters
- Dynamical analysis of clusters of galaxies from cosmological simulations