Research Interest

My research lies at the intersection of galaxy formation and cosmology, with a focus on both theory and observations. Particularly, I work on improving our understanding of galaxies and cosmology through the analysis of large-scale structure galaxy surveys, like the Sloan Digital Sky Survey (SDSS). In the concordance Lambda cold dark matter cosmology model, collapsed structures of dark matter, so-called dark matter halos, constitute the seeds for gas to condense and form galaxies. Whereas dark matter halos are the subject of interest in cosmology, the relationship between them and galaxies, called the galaxy-halo relationship, is prime to our understanding of galaxy formation and evolution. My work in particular concentrates on the analysis of small scales where questions about cosmology and the galaxy-halo connection are closely connected. I employ a variety of different observational probes to explore these questions, including the clustering of galaxies, redshift-space distortions and galaxy-galaxy lensing.

More generally, I have a broad interest in many areas of astrophysical research. For example, I previously published work on the high-energy emission of gamma-ray bursts, the detectability of anisotropies in the diffuse gamma-ray background induced by dark matter annihilation and the rest-frame near-infrared emission of high-redshift galaxies.

Publications

  • Huang, S.; Leauthaud, A.; Bradshaw, C.; Hearin, A.; Behroozi, P.; Lange, J. ; Greene, J.; DeRose, J.; Speagle, J.S.; Xhakaj, E., 2021, “The Outer Stellar Mass of Massive Galaxies: A Simple Tracer of Halo Mass with Scatter Comparable to Richness and Reduced Projection Effects”, submitted to MNRAS
  • Xhakaj, E.; Leauthaud, A.; Lange, J.; Hearin, A.; Diemer, B.; Dalal, N., 2021, “Beyond Mass: Detecting Secondary Halo Properties with Galaxy-Galaxy Lensing”, submitted to MNRAS
  • Lange, J.U. et al., 2021, “Five-percent measurements of the growth rate from simulation-based modelling of redshift-space clustering in BOSS LOWZ”, submitted to MNRAS
  • Lange, J.U. et al., 2021, “On the halo-mass and radial scale dependence of the lensing is low effect”, MNRAS
  • Wang, K; Mao, Y.-Y.; Zentner, A.R.; Lange, J.U.; van den Bosch, F.C.; Wechsler, R.H. “Concentrations of dark haloes emerge from their merger histories”, MNRAS
  • Lange, J.U. et al., 2019, “Cosmological Evidence Modelling: a new simulation-based approach to constrain cosmology on non-linear scales”, MNRAS
  • van den Bosch, F.C.; Lange, J.U.; Zentner, A.R., 2019, “BASILISK: Bayesian Hierarchical Inference of the Galaxy-Halo Connection using Satellite Kinematics–I. Method and validation”, MNRAS
  • Lange, J.U. et al., 2019, “New perspectives on the BOSS small-scale lensing discrepancy for the Planck ΛCDM Cosmology”, MNRAS
  • Wang, K. et al., including Lange, J. U., 2019, “How to Optimally Constrain Galaxy Assembly Bias: Supplement Projected Correlation Functions with Count-in-cells Statistics “, MNRAS
  • Lange, J.U. et al., 2019, “Updated results on the galaxy-halo connection from satellite kinematics in SDSS”, MNRAS
  • Lange, J.U. et al., 2019, “Maturing satellite kinematics into a competitive probe of the galaxy-halo connection”, MNRAS
  • Zentner, A.R.; Hearin, A.; van den Bosch, F.C.; Lange, J.U.; Villarreal, A., 2019, “Constraints on assembly bias from galaxy clustering”, MNRAS
  • Campbell, D. et al., including Lange, J. U., 2018, “The galaxy clustering crisis in abundance matching”, MNRAS
  • Lange, J.U. et al., 2018, “Brightest galaxies as halo centre tracers in SDSS DR7”, MNRAS
  • Villareal, A. S. et al., including Lange, J. U., 2017, “The immitigable nature of assembly bias: the impact of halo definition on assembly bias”, MNRAS
  • Nelson, E. J. et al., including Lange, J. U., 2016, “Where Stars Form: Inside-out Growth and Coherent Star Formation from HST Hα Maps of 3200 Galaxies across the Main Sequence at 0.7 < z < 1.5”, ApJ
  • Momcheva, I. et al., including Lange, J. U., 2016, “The 3D-HST Survey: Hubble Space Telescope WFC3/G141 Grism Spectra, Redshifts, and Emission Line Measurements for ∼ 100,000 Galaxies”, ApJS
  • Lange, J. U. et al., 2016, “Evidence for Non-stellar Rest-frame Near-IR Emission Associated with Increased Star Formation in Galaxies at z ∼ 1”, ApJL
  • Lange, J. U.; Chu, M.-C., 2014, “Can galactic dark matter substructure contribute to the cosmic gamma-ray anisotropy?”, MNRAS
  • Lange, J.; Pohl, M., 2013, “The average GeV-band Emission from Gamma-Ray Bursts”, A&A

You can also find a list of my publications on ORDiD and ADS.