AzTEC 1.1 mm observations of high-z protocluster environments: SMG overdensities and misalignment between AGN jets and SMG distribution
AzTEC 1.1 mm observations of high-z protocluster environments: SMG overdensities and misalignment between AGN jets and SMG distribution
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DOI：
10.1093/mnras/sty1714
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发表时间：
2018-06
影响因子：
4.8
通讯作者：
M. Zeballos;I. Aretxaga;D. Hughes;A. Humphrey;G. Wilson;J. Austermann;J. Dunlop;H. Ezawa;D. Ferrusca;B. Hatsukade;R. Ivison;R. Kawabe;S. Kim;T. Kodama;K. Kohno;A. Montaña;K. Nakanishi;M. Plionis;D. S'anchez-Arguelles;J. Stevens;Y. Tamura;M. Velázquez;M. Yun
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作者：
M. Zeballos;I. Aretxaga;D. Hughes;A. Humphrey;G. Wilson;J. Austermann;J. Dunlop;H. Ezawa;D. Ferrusca;B. Hatsukade;R. Ivison;R. Kawabe;S. Kim;T. Kodama;K. Kohno;A. Montaña;K. Nakanishi;M. Plionis;D. S'anchez-Arguelles;J. Stevens;Y. Tamura;M. Velázquez;M. Yun
我们在1.1毫米波段对16个强射电星系和一个射电宁静类星体进行了观测，观测值为0.5<z<6.3，是用安装在JCMT和ASTE上的阿兹特克照相机获得的，目的是研究亚毫米波段星系向可能的原星系团区域的空间分布。该调查覆盖了1.01平方度的总面积，均方根深度为0.52 - 1.44 mJy，并检测到728个3西格玛以上的源。我们发现，在3个单独的字段（4C+23.56，PKS 1138 -262和MRC 0355 -037）的源计数的一个因素的超密度约200平方度。当结合所有的场时，源计数分析发现在S$_{\rm{1.1mm}} \ge 4$ mJy处有一个过密度达到3$，覆盖了以活动星系核为中心的半径为1.5弧分的区域。我们的地图的大尺寸使我们能够确定，超过1.5弧分的半径，SMG的径向表面密度福尔斯下降到一个空白字段。此外，我们还发现SMG有一种倾向，即SMG与强射电星系的射电喷流（73$+13 ^{-14}$度）垂直排列。这种错位是在4-20 Mpc的投影同向移动尺度上发现的，偏离完美对准（0度）约5西格玛，显然与SMG光度无关。假设阿兹特克源位于射电星系中心的红移处，则可以解释为SMG优先占据质量占优势的丝状漏斗物质，而这些丝状漏斗物质又是射电星系的母体结构。
We present observations at 1.1 mm towards 16 powerful radio galaxies and a radio-quiet quasar at 0.5<z<6.3 acquired with the AzTEC camera mounted at the JCMT and ASTE to study the spatial distribution of submillimeter galaxies towards possible protocluster regions. The survey covers a total area of 1.01 square degrees with rms depths of 0.52 - 1.44 mJy and detects 728 sources above 3sigma. We find overdensities of a factor of ~2 in the source counts of 3 individual fields (4C+23.56, PKS1138-262 and MRC0355-037) over areas of ~200 sq deg. When combining all fields, the source-count analysis finds an overdensity that reaches a factor $\gtrsim 3$ at S$_{\rm{1.1mm}} \ge 4$ mJy covering a 1.5-arcmin-radius area centred on the AGN. The large size of our maps allows us to establish that beyond a radius of 1.5 arcmin, the radial surface density of SMGs falls to that of a blank field. In addition, we find a trend for SMGs to align closely to a perpendicular direction with respect to the radio jets of the powerful central radio galaxies (73$_{+13}^{-14}$ degrees). This misalignment is found over projected co-moving scales of 4-20 Mpc, departs from perfect alignment (0 deg) by ~5sigma, and apparently has no dependence on SMG luminosity. Under the assumption that the AzTEC sources are at the redshift of the central radio galaxy, the misalignment reported here can be interpreted as SMGs preferentially inhabiting mass-dominant filaments funneling material towards the protoclusters, which are also the parent structures of the radio galaxies.