Galaxy-galaxy weak lensing in the Sloan Digital Sky Survey: Intrinsic alignments and shear calibration errors

Christopher M. Hirata, Rachel Mandelbaum, Uroš Seljak, Jacek Guzik, Nikhil Padmanabhan, Cullen Blake, Jonathan Brinkmann, Tamas Budávari, Andrew Connolly, Istvan Csabai, Ryan Scranton, Alexander S. Szalay

Research output: Contribution to journalArticle

113 Citations (Scopus)

Abstract

Galaxy-galaxy lensing has emerged as a powerful probe of the dark matter haloes of galaxies, but is subject to contamination if intrinsically aligned satellites of the lens galaxy are used as pan of the source sample. We present a measurement of this intrinsic shear using 200 747 lens galaxies from the Sloan Digital Sky Survey (SDSS) spectroscopic sample and a sample of satellites selected using photometric redshifts. The mean intrinsic shear at transverse separations of 30-446 h-1 kpc is constrained to be -0.0062 < Δγ < +0.0066 (99.9 per cent confidence, including identified systematics), which limits contamination of the galaxy-galaxy lensing signal to at most ∼15 per cent on these scales. We present these limits as a function of transverse separation and lens luminosity. We furthermore investigate shear calibration biases in the SDSS, which can also affect galaxy-galaxy lensing, and conclude that the shear amplitude is calibrated to better than 18 per cent. This includes noise-induced calibration biases in the ellipticity, which are small for the sample considered here, but which can be more important if low signal-to-noise ratio or poorly resolved source galaxies are used.

Original languageEnglish
Pages (from-to)529-549
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume353
Issue number2
DOIs
Publication statusPublished - Sep 11 2004

Keywords

  • Galaxies: haloes
  • Gravitational lensing

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Galaxy-galaxy weak lensing in the Sloan Digital Sky Survey: Intrinsic alignments and shear calibration errors'. Together they form a unique fingerprint.

  • Cite this

    Hirata, C. M., Mandelbaum, R., Seljak, U., Guzik, J., Padmanabhan, N., Blake, C., Brinkmann, J., Budávari, T., Connolly, A., Csabai, I., Scranton, R., & Szalay, A. S. (2004). Galaxy-galaxy weak lensing in the Sloan Digital Sky Survey: Intrinsic alignments and shear calibration errors. Monthly Notices of the Royal Astronomical Society, 353(2), 529-549. https://doi.org/10.1111/j.1365-2966.2004.08090.x