arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2412.04436astro-ph.GA
收藏

热尘埃遮蔽星系周围莱曼断裂星系候选体的超密度

Overdensity of Lyman-Break Galaxy Candidates Around Hot Dust-Obscured Galaxies

Dejene Zewdie, Roberto J. Assef, Trystan Lambert, Chiara Mazzucchelli, S. Ilani Loubser, Manuel Aravena, Jorge González-López, Hyunsung D. Jun, Chao-Wei Tsai, D… 展开作者

Dejene Zewdie, Roberto J. Assef, Trystan Lambert, Chiara Mazzucchelli, S. Ilani Loubser, Manuel Aravena, Jorge González-López, Hyunsung D. Jun, Chao-Wei Tsai, Daniel Stern, Guodong Li, Román Fernández Aranda, Tanio Díaz-Santos, Peter R. M. Eisenhardt, Andrey Vayner, Lee R. Martin, Andrew W. Blain, Jingwen Wu

AI总结:

通过研究三个热尘埃遮蔽星系(Hot DOGs)附近莱曼断裂星系候选体的超密度,发现其周围存在显著集中的超密度,部分在约2 Mpc外急剧下降,暗示Hot DOGs可能是原星系团的优良示踪物及最亮团星系的早期阶段。

摘要:

热尘埃遮蔽星系(Hot DOGs)是一类超高光度、高度遮蔽的类星体。多项研究通过识别光学至远红外波长的伴星系,表明这些天体位于宇宙中显著的超密度区域。本文通过研究三个Hot DOGs附近莱曼断裂星系(LBG)候选体的表面密度,进一步表征其环境。其中两个目标WISE J041010.60-091305.2(红移z=3.631)和WISE J083153.25+014010.8(z=3.912)使用Baade/IMACS的深度观测识别LBG候选伴星系;第三个目标WISE J224607.56-052634.9(z=4.601)则重新分析先前发表的Gemini-S/GMOS-S数据。我们利用COSMOS2020目录优化了每个目标红移处的LBG光度选择标准。将这些Hot DOGs附近LBG候选体的密度与COSMOS2020目录比较后发现:W0410-0913、W0831+0140和W2246-0526周围的超密度(未校正/校正污染)分别为δ=1.83±0.08(δ'=7.49±0.68)、δ=4.67±0.21(δ'=29.17±2.21)和δ=2.36±0.25(δ'=11.60±1.96)。此外,超密度集中在每个Hot DOG周围。分析还显示,W0410-0913和W0831+0140周围区域的超密度在约2 Mpc物理尺度外急剧下降。若这些超密度演化至z=0时形成星系团,结果表明Hot DOG可能对应最亮团星系的早期形成阶段。由于GMOS-S观测视场较小,无法确定W2246-0526是否也是如此。研究结果暗示Hot DOGs可能是原星系团的优良示踪物。

英文摘要:

Hot dust-obscured galaxies (Hot DOGs), are a family of hyper-luminous, heavily obscured quasars. A number of studies have shown that these objects reside in significantly overdense regions of the Universe based on the identification of companions at optical through far-IR wavelengths. Here we present further characterization of their environments by studying the surface density of Lyman break galaxy (LBG) candidates in the vicinity of three Hot DOGs. For two of them, WISE J041010.60-091305.2 at z=3.631 and WISE J083153.25+014010.8 at z=3.912, we identify the candidate LBG companions using deep observations obtained with Baade/IMACS. For the third, WISE J224607.56-052634.9 at z=4.601, we re-analyse previously published data obtained with Gemini-S/GMOS-S. We optimise the LBG photometric selection criteria at the redshift of each target using the COSMOS2020 catalog. When comparing the density of LBG candidates found in the vicinity of these Hot DOGs with that in the COSMOS2020 catalog, we find overdensities of $δ=1.83\pm 0.08$ ($δ' = 7.49\pm 0.68$), $δ=4.67\pm 0.21$ ($δ' = 29.17\pm 2.21$), and $δ= 2.36\pm 0.25$ ($δ' = 11.60\pm 1.96$) around W0410-0913, W0831+0140, and W2246-0526, respectively, without (with) contamination correction. Additionally, we find that the overdensities are centrally concentrated around each Hot DOG. Our analysis also reveals that the overdensity of the fields surrounding W0410-0913 and W0831+0140 declines steeply beyond physical scales of $\sim$2 Mpc. If these overdensities evolve to clusters by z=0, these results suggest that the Hot DOG may correspond to the early formation stages of the brightest cluster galaxy. We were unable to determine if this is also the case for W2246-0526 due to the smaller field of view of the GMOS-S observations. Our results imply that Hot DOGs may be excellent tracers of protoclusters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑