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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.
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Posts
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portfolio
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publications
Chinese edition of A. Zee’s QFT in a nutshell
Published in USTC press, 2021
This is the Chinese translation edition of A. Zee's textbook quantum field theory in a nutshell
Recommended citation: Chaoli Translation Collaboration (2022). "Chinese translation of A. Zee's Quantum Field Theory in a Nutshell" USTC press https://chaoli.club/index.php/7118
Black-Hole-to-Halo Mass Relation From UNIONS Weak Lensing
Published in arxiv preprint. Submitted to AAS Journals, 2024
This letter presents, for the first time, direct constraints on the black-hole-to-halo-mass relation using weak gravitational lensing measurements. We construct type I and type II Active Galactic Nuclei (AGNs) samples from the Sloan Digital Sky Survey (SDSS), with a mean redshift of 0.4-0.1 for type I (type II) AGNs. This sample is cross-correlated with weak lensing shear from the Ultraviolet Near Infrared Northern Survey (UNIONS). We compute the excess surface mass density of the halos associated with 36,181 AGNs from 94,308,561 lensed galaxies and fit the halo mass in bins of black-hole mass. We find that more massive AGNs reside in more massive halos. We see no evidence of dependence on AGN type or redshift in the black-hole-to-halo-mass relationship when systematic errors in the measured black-hole masses are included. Our results are consistent with previous measurements for non-AGN galaxies. At a fixed black-hole mass, our weak-lensing halo masses are consistent with galaxy rotation curves, but significantly lower than galaxy clustering measurements. Finally, our results are broadly consistent with state-of-the-art hydro-dynamical cosmological simulations, providing a new constraint for black-hole masses in simulations.
Recommended citation: Li, Q., Kilbinger, M., Luo, W., et al.\ 2024, arXiv:2402.10740. doi:10.48550/arXiv.2402.10740 https://ui.adsabs.harvard.edu/abs/2024arXiv240210740L/abstract
talks
Undergraduate Academic Annual Conference: Dark Matter Halo Mass Measurement with Galaxy-galaxy Lensing
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This is a talk of Undergraduate Academic Annual Conference of Department of Astronomy, USTC. In this talk, I introduce basic principles of using galaxy-galaxy lensing to measure dark matter halo mass and some recent progress of two of my works, satellite lensing of SDSS and comparison between weak lensing mass and caustic mass.
2022 PKU-DoA Undergraduate Astronomy Symposium: Subhalo Properties from SDSS Weak Lensing
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This is a talk of 2022 PKU-DoA Undergraduate Astronomy Symposium. In this talk, I introduce my work on subhalo mass measurement from SDSS weak lensing. We use Luo et al. (2017) SDSS DR7 shape catalog to study subhaloes in Yang et al. (2006) group catalog. We find an unreported selection bias between host halo mass and separation between satellite galaxies and their central galaxies. We develop a weigting method to correct this bias. With a 2 free paramater model to describe excess surface density of subhalo, we fit the weighted lensing signal by MCMC. In this talk, I will first introduce galaxy-galaxy lensing method and subhalo density profile, then talk about the methods and main results of this work.
Cluster Seminar: Subhalo Properties in SDSS DR7 with Galaxy-galaxy Lensing
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This is a talk of cluster seminar of Department of Astronomy, Umich. In this talk, I will focus on our recent work about subhalo properties in Yang et al. (2007) 's group catalog based on SDSS DR7. We devide satellite galaxies into different stellar mass and BCG-center separation bins, then measure the lensing signals around these satellites. We discover an unreported selection effect between separation and host halo mass and use a weighting method to correct it. With a 2 free paramater model to describe excess surface density of subhalo, we fit the weighted lensing signal by MCMC. In this talk, I will first introduce galaxy-galaxy lensing method and subhalo density profile, then talk about the methods and main results of this work.