The VLT LBG Redshift Survey* – II. Interactions between galaxies and the IGM at z∼ 3
The VLT LBG Redshift Survey* – II. Interactions between galaxies and the IGM at z∼ 3
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VLT LBG 红移巡天* – II. 星系与 IGM 在 z~ 3 处的相互作用
DOI：
10.1111/j.1365-2966.2011.17247.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
G. Worseck
中科院分区：
文献类型：
--
作者：
N. Crighton;R. Bielby;R. Bielby;T. Shanks;L. Infante;C. Bornancini;Nicolas Bouché;D. Lambas;J. Lowenthal;D. Minniti;Simon L. Morris;Nelson Padilla;C. Péroux;P. Petitjean;T. Theuns;T. Theuns;P. Tummuangpak;P. Weilbacher;L. Wisotzki;G. Worseck
我们测量了9个VLT VIMOS LBG红移巡天区的243个z 3类星体的红移，每个巡天区都以一个已知的亮类星体为中心。利用这些类星体的光谱，我们测量的交叉相关中性氢气导致的Ly森林和1020莱曼break星系在z 3。我们发现，在5小时1百万秒差距的星系中性氢吸收的增加与Adelberger等人（2003，2005）的结果一致。Ly-LBG互相关可以通过在大于3 h-1 Mpc的尺度上的幂律来描述。当考虑星系速度弥散时，我们在较小尺度（< 2 h 1 Mpc）的结果也与Adelberger等人（2005）的结果非常一致。几乎没有直接的迹象表明，一个地区的传输尖峰以上的平均IGM值，这可能表明存在的恒星形成反馈。为了测量星系的速度色散，包括内在的LBG速度色散和红移误差，我们使用了Bielby等人（2010）的LBG-LBG红移空间失真测量。我们发现Adelberger等人（2003）的结果中所暗示的红移-空间传输尖峰太窄，在可能存在LBG速度色散的情况下不可能是物理的，而可能是统计的uke。然而，无论是我们还是以前的数据都不能排除存在一个狭窄的，真实空间的传输尖峰，考虑到LBG周围的Ly吸收增加的证据，这可以掩盖尖峰的存在时，与现实的LBG速度色散卷积。最后，我们确定了176 Civ系统的类星体光谱和ND的LBG-Civ相关强度的尺度为10小时1 Mpc的关系在Mpc尺度测量一致。
We have measured redshifts for 243 z 3 quasars in nine VLT VIMOS LBG redshift survey areas, each of which is centred on a known bright quasar. Using spectra of these quasars, we measure the cross-correlation between neutral hydrogen gas causing the Ly forest and 1020 Lyman-break galaxies at z 3. We nd an increase in neutral hydrogen absorption within 5 h 1 Mpc of a galaxy in agreement with the results of Adelberger et al. (2003, 2005). The Ly -LBG cross-correlation can be described by a power-law on scales larger than 3h 1 Mpc. When galaxy velocity dispersions are taken into account our results at smaller scales (< 2 h 1 Mpc) are also in good agreement with the results of Adelberger et al. (2005). There is little immediate indication of a region with a transmission spike above the mean IGM value which might indicate the presence of star-formation feedback. To measure the galaxy velocity dispersions, which include both intrinsic LBG velocity dispersion and redshift errors, we have used the LBG-LBG redshift space distortion measurements of Bielby et al. (2010). We nd that the redshift-space transmission spike implied in the results of Adelberger et al. (2003) is too narrow to be physical in the presence of the likely LBG velocity dispersion and is likely to be a statistical uke. Nevertheless, neither our nor previous data can rule out the presence of a narrow, real-space transmission spike, given the evidence of the increased Ly absorption surrounding LBGs which can mask the spike’s presence when convolved with a realistic LBG velocity dispersion. Finally, we identify 176 Civ systems in the quasar spectra and nd an LBG-C iv correlation strength on scales of 10 h 1 Mpc consistent with the relation measured at Mpc scales.