tokens: into comoving space. The underlying halos are the same. Left panels: a slice of the HCN temperature cube, in transverse (on-sky) directions. Middle panels: slices of the HCN and CO temperature cubes, with one axis along the line of sight. Note the difference in comoving volume and location. Right panels: a slice of the CO temperature cube, again in transverse directions. 2.3. Power Spectra from Observations We work with the spherically averaged, comoving 3D power spectrum P ( k ) and the average of all 2D sky angular power spectra from each frequency channel in the data cube. We calculate P ( k ) by calculating the full 3D power spectrum of the temperature cube in comoving space, binning it in radial “shells” of , and averaging the full spectrum in each bin. We obtain in each frequency channel through similar binning of the 2D power spectrum in space. As Figure 2 shows, the comoving volume is not perfectly rectangular, but we approximate it as such for P ( k ) calculations here. As in Li et al. ( 2016 ) and Breysse et al. ( 2015 ), we present the spherical 3D power spectra as and the averaged 2D power spectra in the conventional form, using a flat-sky approximation as in Chiang Chen ( 2012 ) and Breysse et al. ( 2015 ). While the 3D analog to is just P ( k ) rather than the rescaled , and the 2D analog to is the suitably rescaled rather than just , we use these rather disparate presentations to follow the conventions used in previous literature. 3. Results 3.1. Simulated Temperature Cubes For 496 different pairs of CO and HCN light cones, we generate temperature cubes for CO emission and HCN emission, which we then add together in observed voxels to obtain a simulated map for CO emission plus HCN contamination. Approximately halos in the CO light cones and approximately halos in the HCN light cones typically fall above the cutoff mass of 10 10 and within a patch. Since we used only 100 light cones populated with CO emitters and 100 light cones populated with HCN emitters, there is some redundancy in the light cones used. But since temperature maps were generated anew for each new pairing, even two maps from the same light cone are subject to some differences due to reapplication of halo-to-halo scatter in SFR and luminosity. On top of the halo-to-halo scatter in each light cone, sample variance in large-scale structure between light cones results in light cone–to–light cone scatter in temperature and power spectra. Figure 2 shows slices of a sample pair of temperature data cubes for a given pair of light cones. Note that these slices are generated with the fiducial model (the turnaround model with 0.3 dex log scatter in luminosity). The power-law model maps appear much sparser than maps from any of the other models, especially when only of sufficiently massive halos host emitters. Table 3 lists the mean line temperatures over each simulated CO map and HCN map. Variations in do not appear to significantly affect , and any differences present
ner_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Citation I-Citation I-Citation I-Citation I-Citation I-Citation O B-Citation I-Citation I-Citation I-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O O O O O O O O O B-Citation I-Citation I-Citation I-Citation I-Citation O B-Citation I-Citation I-Citation I-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O