Kavli Affiliate: James J. Bock
| First 5 Authors: Richard M. Feder, James J. Bock, Yun-Ting Cheng, Asantha Cooray, Phillip M. Korngut
| Summary:
We present new anisotropy measurements in the near-infrared (NIR) for angular
multipoles $300<ell<10^5$ using imaging data at 1.1 $mu$m and 1.8 $mu$m from
the fourth flight of the Cosmic Infrared Background ExpeRiment (CIBER). Using
improved analysis methods and higher quality fourth flight data, we detect
surface brightness fluctuations on scales $ell<2000$ with CIBER auto-power
spectra at $sim14sigma$ and 18$sigma$ for 1.1 and 1.8 $mu$m, respectively,
and at $sim10sigma$ in cross-power spectra. The CIBER measurements pass
internal consistency tests and represent a $5-10times$ improvement in power
spectrum sensitivity on several-arcminute scales relative to that of existing
studies. Through cross-correlations with tracers of diffuse galactic light
(DGL), we determine that scattered DGL contributes $<10%$ to the observed
fluctuation power at high confidence. On scales $theta > 5’$, the CIBER auto-
and cross-power spectra exceed predictions for integrated galactic light (IGL)
and integrated stellar light (ISL) by over an order of magnitude, and are
inconsistent with our baseline IGL+ISL+DGL model at high significance. We
cross-correlate two of the CIBER fields with 3.6 $mu$m and 4.5 $mu$m mosaics
from the Spitzer Deep Wide-Field Survey and find similar evidence for
departures from Poisson noise in Spitzer-internal power spectra and CIBER
$times$ Spitzer cross-power spectra. A multi-wavelength analysis indicates
that the auto-power of the fluctuations at low-$ell$ is bluer than the Poisson
noise from IGL and ISL; however, for $1′ <theta < 10’$, the cross-correlation
coefficient $r_{ell}$ of nearly all band combinations decreases with
increasing $theta$, disfavoring astrophysical explanations that invoke a
single correlated sky component.
| Search Query: ArXiv Query: search_query=au:”James J. Bock”&id_list=&start=0&max_results=3