SIMBAD references

2011ApJ...743...21S - Astrophys. J., 743, 21 (2011/December-2)

Constraints on the universal C IV mass density at z ∼ 6 from early infrared spectra obtained with the Magellan FIRE spectrograph.

SIMCOE R.A., COOKSEY K.L., MATEJEK M., BURGASSER A.J., BOCHANSKI J., LOVEGROVE E., BERNSTEIN R.A., PIPHER J.L., FORREST W.J., McMURTRY C., FAN X. and O'MEARA J.

Abstract (from CDS):

We present a new determination of the intergalactic C IV mass density at 4.3 < z < 6.3. Our constraints are derived from high signal-to-noise spectra of seven quasars at z > 5.8 obtained with the newly commissioned Folded-Port Infrared Echellette (FIRE) spectrograph on the Magellan Baade telescope, coupled with six observations of northern objects taken from the literature. We confirm the presence of a downturn in the C IV abundance at = 5.66 by a factor of 4.1 relative to its value at = 4.96, as measured in the same sight lines. In the FIRE sample, a strong system previously reported in the literature as C IV at z = 5.82 is re-identified as Mg II at z = 2.78, leading to a substantial downward revision in Ω_CIV for these prior studies. Additionally, we confirm the presence of at least two systems with low-ionization C II, Si II, and O I absorption but relatively weak signal from C IV. The latter systems may be of interest if the downward trend in Ω_CIV at high redshift is driven in part by ionization effects.

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Journal keyword(s): galaxies: high-redshift - intergalactic medium - quasars: absorption lines

Nomenclature: Table 2: [SCM2011] SDSS JHHMM+DDMM abs N.NNNNN N=17, [SCM2011] SDSS JHHMM+DDMM abs N.NNN N=1, [SCM2011] ULAS J1319+0905 abs N.NNNNN N=2, [SCM2011] CFHQS J1509-1749 abs N.NNNNN N=6.

Simbad objects: 13

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