Two-Point Velocity and Spatial Correlation Functions of the C IV Absorption Systems toward the Tololo Quasar Group: Evidence for Superclustering at Z 2

Dinshaw, N.; Impey, C. D.

doi:10.1086/176794

Cited by 33 publications

(42 citation statements)

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“…In addition, the shape of the broadest component has changed. This variability is confirmed in a MMT spectrum taken in 1994 (Dinshaw & Impey 1996). We do not see any variation in the relative position of the different components suggesting that acceleration is small.…”

Section: Variabilitysupporting

confidence: 75%

“…Within this uncertainty we cannot ascertain the variation in the covering factor between the two epochs. Also there is no statistically significant difference in the covering factor of C iv absorption between UVES data and MMT data of Dinshaw & Impey (1996). It is possible that the relative increase in the C iv column density between years 1994 and 2000, ≥1.2, corresponds to a change of the C iv/C ratio and therefore a change in the ionization parameter.…”

Section: Variabilitymentioning

confidence: 86%

“…Whether the gas is associated with the QSO or with an intervening absorption complex is unclear however (see Jakobsen et al 1986;Ulrich & Perryman 1986;Cristiani et al 1987;Robertson 1987;Sargent & Steidel 1987;Dinshaw & Impey 1996;Lespine & Petitjean 1997). Absorption profiles of highionization lines are shown in Fig.…”

Section: Z Abs = 2 082mentioning

confidence: 99%

“…However the nature and origin of these common absorption systems are still unclear. There are arguments as well as counter arguments for (i) the absorption being produced by a super−cluster sitting in front of the two quasars and (ii) part of the systems being intrinsically associated with the QSOs (see Jakobsen et al 1986;Ulrich & Perryman 1986;Cristiani et al 1987;Robertson 1987;Sargent & Steidel 1987;Dinshaw & Impey 1996;Lespine & Petitjean 1997).…”

Section: Introductionmentioning

confidence: 99%

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A near-solar metallicity damped Lyman-αsystem toward the BAL quasar Tol 1037-2703

Srianand

Petitjean

2001

A&A

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Abstract.We report the detection of a Broad Absorption Line (BAL) outflow in the spectrum of the zem (Mg ii) = 2.201 QSO Tol 1037−2703 with three main BALs at 36 000, 25 300 and 22 300 km s −1 outflow velocities. Although the overall flow is dominated by high ionization lines like N v and C iv, the gas of highest velocity shows absorption from Mg i, Mg ii and Fe ii. Covering factor arguments suggest that the absorbing complexes are physically associated with the QSO and have transverse dimensions smaller than that of the UV continuum emitting region (r < 0.1 pc). We show that the C iv absorption at z abs = 2.082 has a covering factor fc ∼ 0.86 and the absorption profile has varied over the last four years. The detection of absorption from excited fine structure levels of C ii and Si ii in narrow components embedded in the C iv trough reveals large density inhomogeneities. IR pumping is the most likely excitation process. The z abs = 2.139 system is a moderately damped Lyman-α system with log N(H i) ∼ 19.7. The weakness of the metal lines together with the high quality of the data make the metallicity measurements particularly reliable. The absolute metallicity is close to solar with −0.27, −0.49, −0.30). Lines from C i are detected but H2 is absent with a molecular to neutral hydrogen fraction less than 8×10 −6 . From the ionization state of the gas, we argue that the system is situated ∼few Mpc away from the QSO. High metallicity and low nitrogen abundance, [N/Zn] = −1.40, favor the idea that metals have been released by massive stars during a starburst of less than 0.5 Gyr of age. Using the upper limit on the C i * column density in two components, we obtain upper limits on the background temperature of 16.2 and 13.2 K respectively.

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Section: Variabilitysupporting

confidence: 75%

Section: Variabilitymentioning

confidence: 86%

Section: Z Abs = 2 082mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A near-solar metallicity damped Lyman-αsystem toward the BAL quasar Tol 1037-2703

Srianand

Petitjean

2001

A&A

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“…These applications include the construction of the real-space two-point correlation function of various objects such as galaxies (e.g. Yoshii, Peterson, & Takahara 1993) and QSO absorption systems (Williger et al 1996;Dinshaw & Impey 1996), as well as studies of the effect of local sources of ionizing radiation on their surrounding intergalactic medium (e.g Fernández-Soto et al 1995). The latter application actually requires knowledge of not only the distance between two objects but also of the redshift experienced by a photon travelling from one object to another.…”

Section: Introductionmentioning

confidence: 99%

On the cosmological distance and redshift between any two objects

Liske

2000

Monthly Notices of the Royal Astronomical Society

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Evidence for Large Scale Structure in the Ly $\alpha$ Forest at z > 2.6

Williger

Smette

Hazard

et al.

Eso Astrophysics Symposia

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We present a search for spatial and redshift correlations in a 2Å resolution spectroscopic survey of the Lyα forest at 2.15 < z < 3.37 toward ten QSOs concentrated within a 1 • diameter field. We find a signal at 2.7σ significance for correlations of the Lyα absorption line wavelengths between different lines of sight over the whole redshift range. The significance rises to 3.2σ if we restrict the redshift range to 2.60 < z < 3.37, and to 4.0σ if we further restrict the sample to lines with rest equivalent width 0.1 ≤ W 0 /Å < 0.9. We conclude that a significant fraction of the Lyα forest arises in structures whose correlation length extends at least over 30 arcmin (∼ 26 h −1 comoving Mpc at z = 2.6 for H 0 ≡ 100h km s −1 Mpc −1 , Ω = 1.0, Λ = 0). We have also calculated the three dimensional two point correlation function for Lyα absorbers; we do not detect any significant signal in the data. However, we note that line blending prevents us from detecting the signal produced by a 100% overdensity of Lyα absorbers in simulated data. We find that the Lyα forest redshift distribution provides

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Two-Point Velocity and Spatial Correlation Functions of the C IV Absorption Systems toward the Tololo Quasar Group: Evidence for Superclustering at Z 2

Cited by 33 publications

References 0 publications

A near-solar metallicity damped Lyman-αsystem toward the BAL quasar Tol 1037-2703

A near-solar metallicity damped Lyman-αsystem toward the BAL quasar Tol 1037-2703

On the cosmological distance and redshift between any two objects

Evidence for Large Scale Structure in the Ly $\alpha$ Forest at z > 2.6

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