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Title: Evidence for C ii diffuse line emission at redshift z ∼ 2.6

Abstract

ABSTRACT C ii is one of the brightest emission lines from star-forming galaxies and is an excellent tracer for star formation. Recent work measured the C ii emission line amplitude for redshifts 2 < z < 3.2 by cross-correlating Planck High Frequency Instrument emission maps with tracers of overdensity from the Baryon Oscillation Spectroscopic Sky Survey, finding $${I}_{{\text C}\,\rm {\small II}}=6.6^{+5.0}_{-4.8}\times {10}^{4}$$ Jy sr−1 at $$95\,{\text{per cent}}$$ confidence level. In this paper, we present a refinement of this earlier work by improving the mask weighting in each of the Planck bands and the precision in the covariance matrix. We report a detection of excess emission in the 545 GHz Planck band separate from the cosmic infrared background (CIB) present in the 353–857 GHz Planck bands. This excess is consistent with redshifted C ii emission, in which case we report $$b_{{\text C} \,\rm {\small II}}I_{{\text C} \,\rm {\small II}} =2.0^{+1.2}_{-1.1}\times 10^5$$ Jy sr−1 at $$95\ {\text {per cent}}$$ confidence level, which strongly favours many collisional excitation models of C ii emission. Our detection shows strong evidence for a model with a non-zero C ii parameter, though line intensity mapping observations at high spectral resolution will be needed to confirm this result.

Authors:
 [1];  [1];  [2]
  1. Center for Cosmology and Particle Physics, Department of Physics, New York University, 726 Broadway, New York, NY 10003, USA
  2. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1560910
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society: Letters
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society: Letters Journal Volume: 489 Journal Issue: 1; Journal ID: ISSN 1745-3925
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Yang, Shengqi, Pullen, Anthony R., and Switzer, Eric R. Evidence for C ii diffuse line emission at redshift z ∼ 2.6. United Kingdom: N. p., 2019. Web. doi:10.1093/mnrasl/slz126.
Yang, Shengqi, Pullen, Anthony R., & Switzer, Eric R. Evidence for C ii diffuse line emission at redshift z ∼ 2.6. United Kingdom. doi:10.1093/mnrasl/slz126.
Yang, Shengqi, Pullen, Anthony R., and Switzer, Eric R. Mon . "Evidence for C ii diffuse line emission at redshift z ∼ 2.6". United Kingdom. doi:10.1093/mnrasl/slz126.
@article{osti_1560910,
title = {Evidence for C ii diffuse line emission at redshift z ∼ 2.6},
author = {Yang, Shengqi and Pullen, Anthony R. and Switzer, Eric R.},
abstractNote = {ABSTRACT C ii is one of the brightest emission lines from star-forming galaxies and is an excellent tracer for star formation. Recent work measured the C ii emission line amplitude for redshifts 2 < z < 3.2 by cross-correlating Planck High Frequency Instrument emission maps with tracers of overdensity from the Baryon Oscillation Spectroscopic Sky Survey, finding ${I}_{{\text C}\,\rm {\small II}}=6.6^{+5.0}_{-4.8}\times {10}^{4}$ Jy sr−1 at $95\,{\text{per cent}}$ confidence level. In this paper, we present a refinement of this earlier work by improving the mask weighting in each of the Planck bands and the precision in the covariance matrix. We report a detection of excess emission in the 545 GHz Planck band separate from the cosmic infrared background (CIB) present in the 353–857 GHz Planck bands. This excess is consistent with redshifted C ii emission, in which case we report $b_{{\text C} \,\rm {\small II}}I_{{\text C} \,\rm {\small II}} =2.0^{+1.2}_{-1.1}\times 10^5$ Jy sr−1 at $95\ {\text {per cent}}$ confidence level, which strongly favours many collisional excitation models of C ii emission. Our detection shows strong evidence for a model with a non-zero C ii parameter, though line intensity mapping observations at high spectral resolution will be needed to confirm this result.},
doi = {10.1093/mnrasl/slz126},
journal = {Monthly Notices of the Royal Astronomical Society: Letters},
number = 1,
volume = 489,
place = {United Kingdom},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1093/mnrasl/slz126

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