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Title: Search for CII emission on cosmological scales at redshift Z ~ 2.6

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [3];  [2];  [4]
  1. New York Univ. (NYU), New York, NY (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States); USA Academia Sinica Institute of Astronomy and Astrophysics, Taipei (Taiwan)
  4. California Inst. of Technology (CalTech), Pasadena, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We present a search for CII emission over cosmological scales at high redshifts. The CII line is a prime candidate to be a tracer of star formation over large-scale structure since it is one of the brightest emission lines from galaxies. Redshifted CII emission appears in the submillimeter regime, which means it could potentially be present in the higher frequency intensity data from the Planck satellite is used to measure the cosmic infrared background (CIB). We search for CII emission over redshifts z = 2–3.2 in the Planck 545 GHz intensity map by cross-correlating the three highest frequency Planck maps with spectroscopic quasars and CMASS galaxies from the Sloan Digital Sky Survey III, which we then use to jointly fit CII intensity, CIB parameters, and thermal Sunyaev–Zeldovich (SZ) emission. We report a measurement of an anomalous emission Iν = 6.6+5.0–4.8 × 104 Jy sr–1 at 95 percent confidence, which could be explained by CII emission, favouring collisional excitation models of CII emission that tend to be more optimistic than models based on CII luminosity scaling relations from local measurements; however, a comparison of Bayesian information criteria reveals that this model and the CIB & SZ model are equally plausible. Thus, more sensitive measurements will be needed to confirm the existence of a large-scale CII emission at high redshifts. Lastly, we forecast that intensity maps from Planck cross-correlated with quasars from the Dark Energy Spectroscopic Instrument would increase our sensitivity to CII emission by a factor of 5, while the proposed Primordial Inflation Explorer could increase the sensitivity further.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1492322
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 478, Issue 2; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (17)

Simulated multitracer analyses with H  i intensity mapping journal March 2019
Broadband Intensity Tomography: Spectral Tagging of the Cosmic UV Background journal June 2019
Optimally Mapping Large-scale Structures with Luminous Sources journal May 2019
Probing Cosmic Origins with CO and [C ii] Emission Lines journal January 2019
A Self-consistent Framework for Multiline Modeling in Line Intensity Mapping Experiments journal December 2019
Constraining the evolution of [C ii] intensity through the end stages of reionization journal July 2019
Predictions and sensitivity forecasts for reionization-era [C  ii ] line intensity mapping journal March 2019
Measuring the EoR Power Spectrum without Measuring the EoR Power Spectrum journal April 2019
User’s guide to extracting cosmological information from line-intensity maps journal December 2019
Line Intensity Mapping with [C ii] and CO(1-0) as Probes of Primordial Non-Gaussianity journal February 2019
Predictions and sensitivity forecasts for reionization-era [C II] line intensity mapping text January 2019
Probing Cosmic Origins with CO and [CII] Emission Lines text January 2018
Line intensity mapping with [CII] and CO(1-0) as probes of primordial non-Gaussianity text January 2018
Constraining the evolution of CII intensity through the end stages of reionization text January 2018
Measuring the EoR Power Spectrum Without Measuring the EoR Power Spectrum text January 2018
A Self-consistent Framework for Multiline Modeling in Line Intensity Mapping Experiments text January 2019
Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity Mapping text January 2019

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