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Title: THE MID-INFRARED LUMINOSITY FUNCTION AT z < 0.3 FROM 5MUSES: UNDERSTANDING THE STAR FORMATION/ACTIVE GALACTIC NUCLEUS BALANCE FROM A SPECTROSCOPIC VIEW

Abstract

We present rest-frame 15 and 24 {mu}m luminosity functions (LFs) and the corresponding star-forming LFs at z < 0.3 derived from the 5MUSES sample. Spectroscopic redshifts have been obtained for {approx}98% of the objects and the median redshift is {approx}0.12. The 5-35 {mu}m Infrared Spectrograph spectra allow us to estimate accurately the luminosities and build the LFs. Using a combination of starburst and quasar templates, we quantify the star formation (SF) and active galactic nucleus (AGN) contributions in the mid-IR spectral energy distribution. We then compute the SF LFs at 15 and 24 {mu}m, and compare with the total 15 and 24 {mu}m LFs. When we remove the contribution of AGNs, the bright end of the LF exhibits a strong decline, consistent with the exponential cutoff of a Schechter function. Integrating the differential LF, we find that the fractional contribution by SF to the energy density is 58% at 15 {mu}m and 78% at 24 {mu}m, while it goes up to {approx}86% when we extrapolate our mid-IR results to the total IR luminosity density. We confirm that the AGNs play more important roles energetically at high luminosities. Finally, we compare our results with work at z {approx} 0.7 and confirmmore » that evolution on both luminosity and density is required to explain the difference in the LFs at different redshifts.« less

Authors:
; ;  [1]; ;  [2];  [3];  [4];  [5];  [6]
  1. Infrared Processing and Analysis Center, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  2. Spitzer Science Center, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  3. Department of Physics and Astronomy, University of Wyoming, WY (United States)
  4. George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843-4242 (United States)
  5. Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)
  6. Irfu/Service d' Astrophysique, CEA Saclay (France)
Publication Date:
OSTI Identifier:
21576669
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 734; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/734/1/40; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ENERGY DENSITY; ENERGY SPECTRA; FUNCTIONS; GALAXIES; GALAXY NUCLEI; INFRARED SPECTRA; LUMINOSITY; RED SHIFT; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; SPECTRA

Citation Formats

Yanling, Wu, Yong, Shi, Helou, George, Armus, Lee, Stierwalt, Sabrina, Dale, Daniel A, Papovich, Casey, Rahman, Nurur, and Dasyra, Kalliopi. THE MID-INFRARED LUMINOSITY FUNCTION AT z < 0.3 FROM 5MUSES: UNDERSTANDING THE STAR FORMATION/ACTIVE GALACTIC NUCLEUS BALANCE FROM A SPECTROSCOPIC VIEW. United States: N. p., 2011. Web. doi:10.1088/0004-637X/734/1/40.
Yanling, Wu, Yong, Shi, Helou, George, Armus, Lee, Stierwalt, Sabrina, Dale, Daniel A, Papovich, Casey, Rahman, Nurur, & Dasyra, Kalliopi. THE MID-INFRARED LUMINOSITY FUNCTION AT z < 0.3 FROM 5MUSES: UNDERSTANDING THE STAR FORMATION/ACTIVE GALACTIC NUCLEUS BALANCE FROM A SPECTROSCOPIC VIEW. United States. https://doi.org/10.1088/0004-637X/734/1/40
Yanling, Wu, Yong, Shi, Helou, George, Armus, Lee, Stierwalt, Sabrina, Dale, Daniel A, Papovich, Casey, Rahman, Nurur, and Dasyra, Kalliopi. 2011. "THE MID-INFRARED LUMINOSITY FUNCTION AT z < 0.3 FROM 5MUSES: UNDERSTANDING THE STAR FORMATION/ACTIVE GALACTIC NUCLEUS BALANCE FROM A SPECTROSCOPIC VIEW". United States. https://doi.org/10.1088/0004-637X/734/1/40.
@article{osti_21576669,
title = {THE MID-INFRARED LUMINOSITY FUNCTION AT z < 0.3 FROM 5MUSES: UNDERSTANDING THE STAR FORMATION/ACTIVE GALACTIC NUCLEUS BALANCE FROM A SPECTROSCOPIC VIEW},
author = {Yanling, Wu and Yong, Shi and Helou, George and Armus, Lee and Stierwalt, Sabrina and Dale, Daniel A and Papovich, Casey and Rahman, Nurur and Dasyra, Kalliopi},
abstractNote = {We present rest-frame 15 and 24 {mu}m luminosity functions (LFs) and the corresponding star-forming LFs at z < 0.3 derived from the 5MUSES sample. Spectroscopic redshifts have been obtained for {approx}98% of the objects and the median redshift is {approx}0.12. The 5-35 {mu}m Infrared Spectrograph spectra allow us to estimate accurately the luminosities and build the LFs. Using a combination of starburst and quasar templates, we quantify the star formation (SF) and active galactic nucleus (AGN) contributions in the mid-IR spectral energy distribution. We then compute the SF LFs at 15 and 24 {mu}m, and compare with the total 15 and 24 {mu}m LFs. When we remove the contribution of AGNs, the bright end of the LF exhibits a strong decline, consistent with the exponential cutoff of a Schechter function. Integrating the differential LF, we find that the fractional contribution by SF to the energy density is 58% at 15 {mu}m and 78% at 24 {mu}m, while it goes up to {approx}86% when we extrapolate our mid-IR results to the total IR luminosity density. We confirm that the AGNs play more important roles energetically at high luminosities. Finally, we compare our results with work at z {approx} 0.7 and confirm that evolution on both luminosity and density is required to explain the difference in the LFs at different redshifts.},
doi = {10.1088/0004-637X/734/1/40},
url = {https://www.osti.gov/biblio/21576669}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 734,
place = {United States},
year = {Fri Jun 10 00:00:00 EDT 2011},
month = {Fri Jun 10 00:00:00 EDT 2011}
}