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Title: The 2.4 μ m Galaxy Luminosity Function as Measured Using WISE. III. Measurement Results

Abstract

The Widefield Infrared Survey Explorer (WISE) satellite surveyed the entire sky multiple times in four infrared wavelengths (3.4, 4.6, 12, and 22 μm). The unprecedented combination of coverage area and depth gives us the opportunity to measure the luminosity function (LF) of galaxies, one of the fundamental quantities in the study of them, at 2.4 μm to an unparalleled level of formal statistical accuracy in the near-infrared. The big advantage of measuring LFs at wavelengths in the window of ≈2–3.5 μm is that it correlates more closely to the total stellar mass in galaxies than others. In this paper we report on the parameters of the 2.4 μm LF of galaxies obtained from applying the spectro-luminosity-functional-based methods to datasets from the previous papers in this series using the mean and covariance of 2.4 μm normalized spectral energy distributions (SEDs) from our previous work. In terms of the single Schechter function parameters evaluated at the present epoch, the combined result is: $${\phi }_{\star }=5.8\,\pm [{0.3}_{\mathrm{stat}},{0.4}_{\mathrm{sys}}]\times {10}^{-3}\,{\mathrm{Mpc}}^{-3}$$, $${L}_{\star }=6.4\pm [{0.1}_{\mathrm{stat}},{0.3}_{\mathrm{sys}}]\times {10}^{10}\,{L}_{2.4\mu {\rm{m}}\odot }$$ (M$$_{\star}$$ = -21.67 ± [0.02 stat, 0.05 sys] AB mag), and $α$ = -1.050 ± [0.004 stat, 0.04 sys]. The high statistical accuracy comes from combining public redshift surveys with the wide coverage from WISE, and the unevenness in statistical accuracy is a result of our efforts to work around biases of uncertain origin that affect resolved and marginally resolved galaxies. With further refinements, the techniques applied in this work promise to advance the study of the SED of the universe.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. Diego Portales, Santiago (Chile)
  3. Univ. of Cape Town, Cape Town (Republic of South Africa)
  4. NorthWest Research Associates, Redmond, WA (United States)
  5. Univ. of California, Davis, CA (United States)
  6. California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab.
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1545273
Grant/Contract Number:  
AC52-07NA27344; NAS5-26555; NNX13AC07G
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 866; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: evolution; galaxies: luminosity function, mass function; galaxies: statistics

Citation Formats

Lake, S. E., Wright, E. L., Assef, R. J., Jarrett, T. H., Petty, S., Stanford, S. A., Stern, D., and Tsai, C. -W. The 2.4 μ m Galaxy Luminosity Function as Measured Using WISE. III. Measurement Results. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aadd47.
Lake, S. E., Wright, E. L., Assef, R. J., Jarrett, T. H., Petty, S., Stanford, S. A., Stern, D., & Tsai, C. -W. The 2.4 μ m Galaxy Luminosity Function as Measured Using WISE. III. Measurement Results. United States. doi:10.3847/1538-4357/aadd47.
Lake, S. E., Wright, E. L., Assef, R. J., Jarrett, T. H., Petty, S., Stanford, S. A., Stern, D., and Tsai, C. -W. Wed . "The 2.4 μ m Galaxy Luminosity Function as Measured Using WISE. III. Measurement Results". United States. doi:10.3847/1538-4357/aadd47. https://www.osti.gov/servlets/purl/1545273.
@article{osti_1545273,
title = {The 2.4 μ m Galaxy Luminosity Function as Measured Using WISE. III. Measurement Results},
author = {Lake, S. E. and Wright, E. L. and Assef, R. J. and Jarrett, T. H. and Petty, S. and Stanford, S. A. and Stern, D. and Tsai, C. -W.},
abstractNote = {The Widefield Infrared Survey Explorer (WISE) satellite surveyed the entire sky multiple times in four infrared wavelengths (3.4, 4.6, 12, and 22 μm). The unprecedented combination of coverage area and depth gives us the opportunity to measure the luminosity function (LF) of galaxies, one of the fundamental quantities in the study of them, at 2.4 μm to an unparalleled level of formal statistical accuracy in the near-infrared. The big advantage of measuring LFs at wavelengths in the window of ≈2–3.5 μm is that it correlates more closely to the total stellar mass in galaxies than others. In this paper we report on the parameters of the 2.4 μm LF of galaxies obtained from applying the spectro-luminosity-functional-based methods to datasets from the previous papers in this series using the mean and covariance of 2.4 μm normalized spectral energy distributions (SEDs) from our previous work. In terms of the single Schechter function parameters evaluated at the present epoch, the combined result is: ${\phi }_{\star }=5.8\,\pm [{0.3}_{\mathrm{stat}},{0.4}_{\mathrm{sys}}]\times {10}^{-3}\,{\mathrm{Mpc}}^{-3}$, ${L}_{\star }=6.4\pm [{0.1}_{\mathrm{stat}},{0.3}_{\mathrm{sys}}]\times {10}^{10}\,{L}_{2.4\mu {\rm{m}}\odot }$ (M$_{\star}$ = -21.67 ± [0.02stat, 0.05sys] AB mag), and $α$ = -1.050 ± [0.004stat, 0.04sys]. The high statistical accuracy comes from combining public redshift surveys with the wide coverage from WISE, and the unevenness in statistical accuracy is a result of our efforts to work around biases of uncertain origin that affect resolved and marginally resolved galaxies. With further refinements, the techniques applied in this work promise to advance the study of the SED of the universe.},
doi = {10.3847/1538-4357/aadd47},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 866,
place = {United States},
year = {2018},
month = {10}
}

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