Abstract
view Abstract Citations (12) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A VLA Search for Cosmological H I at Z = 3.3 Hardy, Eduardo ; Noreau, Louis Abstract The authors used the new P band (327 MHz) line receiver at the Very Large Array in the D configuration to look for the 21 cm line emitted by primordial galaxy protoclusters and superclusters at z ≈ 3.3. Two fields centered at α = 13h7m, δ = 29°40arcmin and α = 12h, δ = 29° were surveyed, the first of which contains quasar candidates near this redshift. No line emission was detected for any reasonable binning of the data. The total bandpass surveyed per field was 6.25 MHz, and the authors achieved mean H I mass detection sensitivities ranging from ≡(7.5±1.5)×1014 to ≡(4±1)×1015M_sun; for Ω = 1 and 0.1, respectively. The interception probability for protoclusters was near unity. This is the most sensitive search so far at this redshift and suggests that, if the universe is closed (i.e., Ω ≥ 1), either the total number of protoclusters in the universe (in the Sunyaev-Zel'dovich sense) is lower than ≡2×105 or that at z ≈ 3.5 most of the H I had already coalesced. Publication: The Astronomical Journal Pub Date: December 1987 DOI: 10.1086/114579 Bibcode: 1987AJ.....94.1469H Keywords: Galactic Clusters; Galactic Evolution; Hydrogen; Quasars; Radio Astronomy; Very Large Array (Vla); Astronomical Spectroscopy; Calibrating; Centimeter Waves; Cosmology; Red Shift; Universe; Astronomy; COSMOLOGY full text sources ADS | data products SIMBAD (10) NED (9)
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