Radio detections of neutral hydrogen at redshift Z=3.4
Abstract
We have used the Very Large Array to search for ``21-cm'' narrow-band signals from neutral hydrogen at redshift Z=3.4. We detect absorption at Z=3.3968+/-0.0004 against a radio source that has been previously identified with a ``normal'' galaxy at Z=3.395+/-0.005. We detect emission at Z=3.3970+/-0.0003 separated from the absorption by 33' (7-24 Mpc, depending on the cosmological model). This narrow-band emission signal is due to about 3×1014 Msolar of neutral hydrogen as expected from a protocluster of galaxies. We identify it as the first example of a Zel'dovich ``pancake.''
- Publication:
-
Physical Review Letters
- Pub Date:
- 1991
- DOI:
- 10.1103/PhysRevLett.67.3328
- Bibcode:
- 1991PhRvL..67.3328U
- Keywords:
-
- 95.85.Bh;
- 98.60.Ac;
- 98.60.Eg;
- 98.80.Es;
- Radio microwave;
- Observational cosmology