2011ApJ...743...21S

Query : 2011ApJ...743...21S

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 ΩCIV 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 ΩCIV 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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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SDSS J000239.39+255034.8 QSO 00 02 39.403 +25 50 34.83           ~ 69 0
2 SDSS J081827.40+172251.8 QSO 08 18 27.399 +17 22 51.83   25.14 24.42     ~ 81 0
3 SDSS J083643.85+005453.3 QSO 08 36 43.8598536120 +00 54 53.233681320   26.19 24.17     ~ 170 0
4 SDSS J084035.08+562419.7 QSO 08 40 35.08848 +56 24 19.7712   24.95 23.93     ~ 65 0
5 SDSS J103027.09+052455.0 QSO 10 30 27.092 +05 24 55.02   26.15 25.44     ~ 303 0
6 SDSS J113717.72+354956.9 QSO 11 37 17.725 +35 49 56.92   25.31 24.29     ~ 66 0
7 SDSS J114816.64+525150.3 QSO 11 48 16.647 +52 51 50.31   25.73 25.04     ~ 487 0
8 SDSS J130608.25+035626.3 QSO 13 06 08.259 +03 56 26.19   25.59 24.81     ~ 176 0
9 SDSS J131911.29+095051.3 QSO 13 19 11.291 +09 50 51.49           ~ 110 0
10 SDSS J141111.27+121737.3 QSO 14 11 11.277 +12 17 37.31   24.79 23.82     ~ 83 0
11 CFHQS J150941-174926 QSO 15 09 41.77920 -17 49 26.7996           ~ 82 0
12 2MASS J16041571+4244258 LM* 16 04 15.7016050608 +42 44 25.805055300           M1V 4 0
13 SDSS J205407.92+005400.9 QSO 20 54 07.9276956600 +00 54 00.918861840   20.11 19.94     ~ 18 0

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