1. Cross-correlating Carbon Monoxide Line-intensity Maps with Spectroscopic and Photometric Galaxy Surveys
- Author
-
Chung, Dongwoo T., Viero, Marco P., Church, Sarah E., Wechsler, Risa H., Alvarez, Marcelo A., Bond, J. Richard, Breysse, Patrick C., Cleary, Kieran A., Eriksen, Hans K., Foss, Marie K., Gundersen, Joshua O., Harper, Stuart E., Ihle, Håvard T., Keating, Laura C., Murray, Norman, Padmanabhan, Hamsa, Stein, George F., and Wehus, Ingunn K.
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Line-intensity mapping (LIM or IM) is an emerging field of observational work, with strong potential to fit into a larger effort to probe large-scale structure and small-scale astrophysical phenomena using multiple complementary tracers. Taking full advantage of such complementarity means, in part, undertaking line-intensity surveys with galaxy surveys in mind. We consider the potential for detection of a cross-correlation signal between COMAP and blind surveys based on photometric redshifts (as in COSMOS) or based on spectroscopic data (as with the HETDEX survey of Lyman-$\alpha$ emitters). We find that obtaining $\sigma_z/(1+z)\lesssim0.003$ accuracy in redshifts and $\gtrsim10^{-4}$ sources per Mpc$^3$ with spectroscopic redshift determination should enable a CO-galaxy cross spectrum detection significance at least twice that of the CO auto spectrum. Either a future targeted spectroscopic survey or a blind survey like HETDEX may be able to meet both of these requirements., Comment: 19 pages + appendix (31 pages total), 16 figures, 6 tables; accepted for publication in ApJ
- Published
- 2018
- Full Text
- View/download PDF