The Redshift Completeness of Local Galaxy Catalogs

Abstract

There is considerable interest in understanding the demographics of galaxies within the local universe (defined, for our purposes, as the volume within a radius of 200 Mpc or z<0.05). In this pilot paper, using supernovae (SNe) as signposts to galaxies, we investigate the redshift completeness of catalogs of nearby galaxies. In particular, type Ia SNe are bright and are good tracers of the bulk of the galaxy population, since they arise in both old and young stellar populations. Our input sample consists of SNe with redshift < 0.05, discovered by the flux-limited ASAS-SN survey. We define the redshift completeness fraction (RCF) as the number of SN host galaxies with known redshift prior to SN discovery, determined, in this case, via the NASA Extragalactic Database (NED), divided by the total number of newly discovered SNe. Using SNe Ia, we find RCF = 78 (+6, -7, 90% confidence interval) for z < 0.03. We examine the distribution of host galaxies with and without cataloged redshifts as a function of absolute magnitude and redshift, and, unsurprisingly, find that higher-z and fainter hosts are less likely to have a known redshift prior to the detection of the SN. However, surprisingly, some L* galaxies are also missing. We conclude with thoughts on the future improvement of RCF measurements that will be made possible from large SN samples resulting from ongoing and especially upcoming time-domain surveys.

Submitted to ApJ

References in corpus (13)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• Rates and properties of type Ia supernovae as a function of mass and star-formation in their host galaxies
• Updated Nearby Galaxy Catalog
• LOSS Revisited - II: The relative rates of different types of supernovae vary between low- and high-mass galaxies
• The Core Collapse Supernova Rate from the SDSS-II Supernova Survey
• The ASAS-SN Bright Supernova Catalog $-$ I. 2013$-$2014
• Pan-STARRS and PESSTO search for an optical counterpart to the LIGO gravitational wave source GW150914
• The ASAS-SN Bright Supernova Catalog $-$ II. 2015
• The unblinking eye on the sky
• iPTF Search for an Optical Counterpart to Gravitational Wave Trigger GW150914
• Color Me Intrigued: the Discovery of iPTF 16fnm, a Supernova 2002cx-like Object

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