The galaxy luminosity function and the Local Hole

Whitbourn, J.R.; Shanks, T.

Abstract

In a previous study Whitbourn & Shanks have reported evidence for a local void underdense by ≈15 per cent extending to 150–300 h−1 Mpc around our position in the Southern Galactic Cap (SGC). Assuming a local luminosity function they modelled K- and r-limited number counts and redshift distributions in the 6dFGS/2MASS and SDSS redshift surveys and derived normalized n(z) ratios relative to the standard homogeneous cosmological model. Here we test further these results using maximum likelihood techniques that solve for the galaxy density distributions and the galaxy luminosity function simultaneously. We confirm the results from the previous analysis in terms of the number density distributions, indicating that our detection of the ‘Local Hole’ in the SGC is robust to the assumption of either our previous, or newly estimated, luminosity functions. However, there are discrepancies with previously published K- and r-band luminosity functions. In particular the r-band luminosity function has a steeper faint end slope than the r0.1 results of Blanton et al. but is consistent with the r0.1 results of Montero-Dorta & Prada and Loveday et al.

Citation

Whitbourn, J., & Shanks, T. (2016). The galaxy luminosity function and the Local Hole. Monthly Notices of the Royal Astronomical Society, 459(1), 496-507. https://doi.org/10.1093/mnras/stw555

• Journal Article Type: Article
• Acceptance Date: Mar 4, 2016
• Online Publication Date: Mar 8, 2016
• Publication Date: Jun 11, 2016
• Deposit Date: May 30, 2016
• Publicly Available Date: May 31, 2016
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 459
• Issue: 1
• Pages: 496-507
• DOI: https://doi.org/10.1093/mnras/stw555