arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0807.0101astro-ph
收藏

斯巴鲁深场和斯隆数字巡天中z=0.24的恒星形成星系

Star-Forming Galaxies at z=0.24 in the Subaru Deep Field and the Sloan Digital Sky Survey

Taichi Morioka, Aki Nakajima, Yoshiaki Taniguchi, Yasuhiro Shioya, Takashi Murayama, Shunji S. Sasaki

摘要:

我们使用斯巴鲁望远镜获得的存档数据集在斯巴鲁深空(SDF)中搜索z=0.24的H α发射星系。我们在窄带滤波器NB 816中仔细选择了H α发射器,使用B,V,Rc,i '和z'宽带颜色。我们获得了一个样本的258个发射星系的观测等效宽度(H α +[NII] 6548,6584)大于12埃。我们还分析了从斯隆数字巡天(SDSS)的Halalpha发射器的样本,以约束Halalpha光度函数的发光端。使用相同的选择标准,为SDF,并排除AGN后,我们得到317 Halalpha发射恒星形成星系。结合在SDF和SDSS中发现的这两个H α发射体样本,我们得到了一个H α光度函数,其最佳拟合Schechter函数参数为α =-1.31 ^+0.17_-0.17,log phi^* =-2.46 ^+0.34_-0.40 Mpc^-3,log L^* = 41.99^+0.08_-0.07 ergs ^-1。经过消隐校正的H α光度密度为4.45^+2.96_-1.75 x 10^39尔格·s^-1 Mpc^-3。利用H α光度与恒星形成率之间的肯尼库特关系,测区中的恒星形成率密度估计为0.035^+0.024 -0.014 M_sun yr^-1 Mpc^-3。在z = 0.24时,H α发射体的角两点关联函数在875弧分^[2]范围内符合幂律形式,即w(θ)= 0.047^+0.017 -0.013 θ ^-0.66 +- 0.08,对应于关联函数xi(r)=(r/2.6^+1.0_-0.8 Mpc)^(-1.66 +- 0.08)。H α发射体的小相关长度可能意味着活跃的成星星系的弱成团。

英文摘要:

We make a search for Halpha emitting galaxies at z=0.24 in the Subaru Deep Field (SDF) using the archival data set obtained with the Subaru Telescope. We carefully select Halpha emitters in the narrowband filter NB816, using B, V, Rc, i', and z' broad-band colors. We obtain a sample of 258 emitting galaxies with observed equivalent widths of (Halpha+[NII]6548,6584) greater than 12 angstrom. We also analyze a sample of Halpha emitters taken from the Sloan Digital Sky Survey (SDSS) to constrain the luminous end of Halpha luminosity function. Using the same selection criteria as for the SDF, and after excluding AGNs, we obtain 317 Halpha emitting star-forming galaxies. Combining these two samples of Halpha emitters found in both SDF and SDSS, we derive a Halpha luminosity function with best-fit Schechter function parameters of alpha = -1.31^+0.17_-0.17, log phi^* = -2.46^+0.34_-0.40 Mpc^-3, log L^* = 41.99^+0.08_-0.07 ergs s^-1. An extinction-corrected Halpha luminosity density is 4.45^+2.96_-1.75 x 10^39 ergs s^-1 Mpc^-3. Using the Kennicutt relation between the Halpha luminosity and star formation rate, the star formation rate density in the survey volume is estimated as 0.035^+0.024_-0.014 M_sun yr^-1 Mpc^-3. The angular two-point correlation function of Halpha emitters over 875 arcmin^2 at z = 0.24 is well fitted by a power-law form with w(theta) = 0.047^+0.017_-0.013 theta^-0.66 +- 0.08, corresponding to the correlation function of xi(r) = (r/2.6^+1.0_-0.8 Mpc)^(-1.66 +- 0.08). The small correlation length of Halpha emitters may imply the weak clustering of active star-forming galaxies.

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。

↑