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High Metallicity, Photoionised Gas in Intergalactic Large-Scale Filaments
Astrophysics · Submitted 6 Dec 2005
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We conclude that the sight line pierces a filament of gas and galaxies feeding into these clusters.
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The abstract, sentence by sentence
We present high-resolution UV spectra of absorption-line systems toward the low-z QSO HS0624+6907 (z=0.3700). Coupled with spectroscopic galaxy redshifts, we find that many of these absorbers are integalactic gas clouds distributed within large-scale structures. The gas is cool (T<10^5 K) and has relatively high metallicity (Z/Z_sol>0.9). STIS data reveal a cluster of 13 HI Lyman alpha lines within a 1000 km/s interval at z=0.0635. We find 10 galaxies at this redshift with impact parameters ranging from 135 h^-1 kpc to 1.37 h^-1 Mpc. We attribute the HI Lya absorptions to intragroup medium gas, possibly from a large-scale filament viewed along its long axis. Remarkably, the metallicity is near-solar, [M/H] = -0.05 +/- 0.4 (2 sigma uncertainty), yet the nearest galaxy which might pollute the IGM is at least 135 h_70^-1 kpc away. Tidal stripping from nearby galaxies appears to be the most likely origin of this highly enriched, cool gas. More than six Abell galaxy clusters are found within 4 degree of the sight line suggesting that the QSO line of sight passes near a node in the cosmic web. At z~0.077, we find absorption systems as well as galaxies at the redshift of the nearby clusters Abell 564 and Abell 559. We conclude that the sight line pierces a filament of gas and galaxies feeding into these clusters. The absorber at z_abs = 0.07573 associated with Abell 564/559 also has a high metallicity with [C/H] > -0.6, but again the closest galaxy is relatively far from the sight line (293 h^-1 kpc).
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present high-resolution UV spectra of absorption-line systems toward the low-z QSO HS0624+6907 (z=0.3700). | contribution 0.91 | 0.96 | 0.02 | asserted 0.99 |
| s1 | Coupled with spectroscopic galaxy redshifts, we find that many of these absorbers are integalactic gas clouds distributed within large-scale structures. | result 0.91 | 0.94 | 0.18 | asserted 0.99 |
| s2 | The gas is cool (T<10^5 K) and has relatively high metallicity (Z/Z_sol>0.9). | result 1.00 | 0.87 | 0.09 | asserted 1.00 |
| s3 | STIS data reveal a cluster of 13 HI Lyman alpha lines within a 1000 km/s interval at z=0.0635. | result 0.98 | 0.92 | 0.03 | asserted 1.00 |
| s4 | We find 10 galaxies at this redshift with impact parameters ranging from 135 h^-1 kpc to 1.37 h^-1 Mpc. | result 0.99 | 0.95 | 0.03 | asserted 1.00 |
| s5 | We attribute the HI Lya absorptions to intragroup medium gas, possibly from a large-scale filament viewed along its long axis. | interpretation 1.00 | 0.83 | 0.20 | hedged possibility 0.92 |
| s6 | Remarkably, the metallicity is near-solar, [M/H] = -0.05 +/- 0.4 (2 sigma uncertainty), yet the nearest galaxy which might pollute the IGM is at least 135 h_70^-1 kpc away. | result 0.95 | 0.92 | 0.11 | asserted 1.00 |
| s7 | Tidal stripping from nearby galaxies appears to be the most likely origin of this highly enriched, cool gas. | interpretation 1.00 | 0.77 | 0.25 | hedged possibility 0.98 |
| s8 | More than six Abell galaxy clusters are found within 4 degree of the sight line suggesting that the QSO line of sight passes near a node in the cosmic web. | result 0.87 | 0.87 | 0.05 | hedged possibility 0.66 |
| s9 | At z~0.077, we find absorption systems as well as galaxies at the redshift of the nearby clusters Abell 564 and Abell 559. | result 1.00 | 0.95 | 0.05 | asserted 1.00 |
| s10 | We conclude that the sight line pierces a filament of gas and galaxies feeding into these clusters. | interpretation 0.97 | 0.82 | 0.76 | asserted 1.00 |
| s11 | The absorber at z_abs = 0.07573 associated with Abell 564/559 also has a high metallicity with [C/H] > -0.6, but again the closest galaxy is relatively far from the sight line (293 h^-1 kpc). | result 1.00 | 0.96 | 0.05 | asserted 1.00 |
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The paper
Original abstract
We present high-resolution UV spectra of absorption-line systems toward the low-z QSO HS0624+6907 (z=0.3700). Coupled with spectroscopic galaxy redshifts, we find that many of these absorbers are integalactic gas clouds distributed within large-scale structures. The gas is cool (T<10^5 K) and has relatively high metallicity (Z/Z_sol>0.9). STIS data reveal a cluster of 13 HI Lyman alpha lines within a 1000 km/s interval at z=0.0635. We find 10 galaxies at this redshift with impact parameters ranging from 135 h^-1 kpc to 1.37 h^-1 Mpc. We attribute the HI Lya absorptions to intragroup medium gas, possibly from a large-scale filament viewed along its long axis. Remarkably, the metallicity is near-solar, [M/H] = -0.05 +/- 0.4 (2 sigma uncertainty), yet the nearest galaxy which might pollute the IGM is at least 135 h_70^-1 kpc away. Tidal stripping from nearby galaxies appears to be the most likely origin of this highly enriched, cool gas. More than six Abell galaxy clusters are found within 4 degree of the sight line suggesting that the QSO line of sight passes near a node in the cosmic web. At z~0.077, we find absorption systems as well as galaxies at the redshift of the nearby clusters Abell 564 and Abell 559. We conclude that the sight line pierces a filament of gas and galaxies feeding into these clusters. The absorber at z_abs = 0.07573 associated with Abell 564/559 also has a high metallicity with [C/H] > -0.6, but again the closest galaxy is relatively far from the sight line (293 h^-1 kpc).
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