A Subaru Search for Lyα Blobs in and around the Protocluster Region At Redshift z = 3.1
A Subaru Search for Lyα Blobs in and around the Protocluster Region At Redshift z = 3.1
复制标题
DOI：
10.1086/422020
复制
发表时间：
2004-05
期刊：
影响因子：
--
通讯作者：
Y. Matsuda;T. Yamada;T. Hayashino;H. Tamura;R. Yamauchi;M. Ajiki;S. Fujita;T. Murayama;T. Nagao;K. Ohta;S. Okamura;M. Ouchi;K. Shimasaku;Y. Shioya;Y. Taniguchi
中科院分区：
文献类型：
--
作者：
Y. Matsuda;T. Yamada;T. Hayashino;H. Tamura;R. Yamauchi;M. Ajiki;S. Fujita;T. Murayama;T. Nagao;K. Ohta;S. Okamura;M. Ouchi;K. Shimasaku;Y. Shioya;Y. Taniguchi
我们报告的属性35强劲的候选人Lyαblob(实验室),这是大于16 arcsec2 isophotal面积和比0.7×10到16 cm-2尔格的s - 1文件,坐落在protocluster地区红移z = 3.1 Steidel等人发现在SSA22领域,基于广角(31 '×23 ')和深度窄带(NB497; 4977年,应用77 A)和宽带(B、V和R)与斯巴鲁望远镜上的主焦点相机拍摄的图像。在我们的调查中，两个已知的巨型实验室是最明亮和最大的，体积为1.3 × 105 mp3。我们揭示了两个巨大实验室的内部结构，并发现了一些气泡状的特征，这表明过去这些物体中发生了密集的星暴和星系超风现象。其他33个实验室的等高面积为~ 16-78 arcsec2，通量为（0.7-7）× 10-16 ergs -1 cm-2。这35个实验室显示出等等面面积和发射线通量的连续分布。平均表面亮度和形貌分布广泛，从相对致密的高表面亮度物体到非常分散的低表面亮度物体。这些实验室的物理起源可能是：(1)大质量恒星或活动星系核的光电离，或(2)重力加热气体的冷却辐射，或(3)星暴驱动的星系超风的激波加热。假设Salpeter初始质量函数，三分之一的实验室显然与足以产生Lyα辐射的紫外线连续源无关。在这些实验室中，90%位于我们之前研究中选择的283个相对紧凑和强的Lyα发射体的高表面密度区域内。这表明这些实验室可能是与高红移的密集环境有关的现象。
We report the properties of 35 robust candidate Lyα blobs (LABs), which are larger than 16 arcsec2 in isophotal area and brighter than 0.7 × 10-16 ergs s-1 cm-2, located in and around the protocluster region at redshift z = 3.1 discovered by Steidel et al. in the SSA22 field, based on wide-field (31′ × 23′) and deep narrowband (NB497; 4977 Å, FWHM 77 Å) and broadband (B, V, and R) images taken with the prime-focus camera on the Subaru Telescope. The two previously known giant LABs are the most luminous and the largest in our survey volume of 1.3 × 105 Mpc3. We reveal the internal structures of the two giant LABs and discover some bubble-like features, which suggest that intensive starburst and galactic superwind phenomena occurred in these objects in the past. The other 33 LABs have isophotal areas of ∼16–78 arcsec2 and flux of (0.7–7) × 10-16 ergs s-1 cm-2. These 35 LABs show a continuous distribution of isophotal area and emission-line flux. The distributions of average surface brightness and morphology are widespread from relatively compact high surface brightness objects to very diffuse low surface brightness ones. The physical origins of these LABs may be (1) photoionization by massive stars or active galactic nuclei, or (2) cooling radiation from gravitationally heated gas, or (3) shock heating by starburst-driven galactic superwind. One-third of the LABs are apparently not associated with ultraviolet continuum sources that are bright enough to produce Lyα emission, assuming a Salpeter initial mass function. Of these LABs 90% are located inside the high surface density region of the 283 relatively compact and strong Lyα emitters selected in our previous study. This suggests that these LABs may be phenomena related to a dense environment at high redshift.