论文标题
在$ z = 2.3 $的杂质尘埃刺激的类星体W1835 $+4355 $ 4355周围的红色星系密度过高
An overdensity of red galaxies around the hyperluminous dust-obscured quasar W1835$+$4355 at $z=2.3$
论文作者
论文摘要
\ emph {宽阔的红外调查探险家} All-Sky调查发现了一系列新的热灰尘的星系（热狗），已被证实是尘土飞扬的类星体。先前的统计研究表明，在热狗周围，次数和IR选定的星系过剩，表明它们可能居住在密集的地区。在这里，我们在$ 7.5'\ times 7.5'$ field上介绍了近红外（$ j $和$ k_s $ bands）的观察值，该观察是以$ z \ sim 2.3 $使用Palomar 200英寸望远镜上的宽场红外相机。我们使用$ k_s <20 $的对象使用颜色标准$ j-k_s> 2.3 $，以选择遥远的红色星系（DRG）。我们发现W1835 $+$ 4355的DRG的数量密度过多，而三个对照场，大约2倍。左右的红色星系密度约为W1835 $+$ 4355，这与热狗的多波长环境是一致的，这表明热狗可能是一个很好的冰淇淋，对于高红色的红色红色，这是一个很好的冰淇淋。我们发现W1835 $+$ 4355并不居住在密集环境的最密集区域。一种可能的情况是W1835 $+$ 4355正在进行合并过程，这降低了周围地区星系的局部数量密度。
\emph{Wide-field Infrared Survey Explorer} all-sky survey has discovered a new population of hot dust-obscured galaxies (Hot DOGs), which has been confirmed to be dusty quasars. Previous statistical studies have found significant overdensities of sub-millimeter and mid-IR selected galaxies around Hot DOGs, indicating they may reside in dense regions. Here we present the near-infrared ($J$ and $K_s$ bands) observations over a $7.5'\times 7.5'$ field centered on a Hot DOG W1835$+$4355 at $z \sim 2.3$ using the wide-field infrared camera on the Palomar 200-inch telescope. We use the color criterion $J-K_s>2.3$ for objects with $K_s<20$, to select Distant Red Galaxies (DRGs). We find a significant excess of number density of DRGs in W1835$+$4355 field compared to three control fields, by a factor of about 2. The overdensity of red galaxies around W1835$+$4355 are consistent with the multi-wavelength environment of Hot DOGs, suggesting that Hot DOGs may be a good tracer for dense regions at high redshift. We find that W1835$+$4355 do not reside in the densest region of the dense environment traced by itself. A possible scenario is that W1835$+$4355 is undergoing merging process, which lowers the local number density of galaxies in its surrounding region.
