1603.02277
[CII] emission in z~6 strongly lensed, star-forming galaxies
Knudsen, Richard, Kneib, Jauzac, Clement, Drouart, Egami, Lindroos
FIR fine-structure of [CII] at 1900.5 Ghz is one of the brightest cooling lines in local galaxies, and therefore suggested as an efficient tracer for star-formation in very high-redshift galaxies. A lowest L_[CII] = 8.3e6 Lsun detected in A383-5.1 (SFR of 3.2 Msun/yr and magnification of mu=11.4) for z>6. Results consistent with predictions for low-metallicity galaxies at z>6, but other effects could also play a role in terms of decreasing L_[CII]. The detection of A383-5.1 is encouraging and suggests that detections are possible, but much fainter than initially predicted.
1603.02356
Measuring the distance-redshift relation with the cross-correlation of gravitational wave standard sirens and galaxies
Oguri
GWs from inspiring compact binaries are known to be an excellent absolute distance indicator, yet it is unclear whether EM counterparts of these events are securely identified for measuring their redshifts, especially in the case of BH-BH mergers such as the one recently observed with Advanced LIGO. Propose to use the cross-correlation between spatial distributions of GW sources and galaxies with known redshifts are an alternative means of constraining the distance-redshift relation from GWs. In the analysis, explicitly include the modulation of the distribution of GW sources due to WL. Show that the cross-correlation analysis in next-generation observations will be able to tightly constrain the relation between the absolute distance and the redshift, and therefore constrain the Hubble constant as well as DE parameters.
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