Molecular Gas in the z = 1.2 Ultraluminous Merger GOODS J123634.53+621241.3
Molecular Gas in the z = 1.2 Ultraluminous Merger GOODS J123634.53+621241.3
复制标题
z = 1.2 的分子气体 超发光合并货物 J123634.53 621241.3
DOI：
10.1086/589830
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
D. Woody
中科院分区：
文献类型：
--
作者：
D. Frayer;Jin Koda;A. Pope;Minh Huynh;R. Chary;D. Scott;M. Dickinson;D. C. Bock;John M. Carpenter;D. Hawkins;M. Hodges;James W. Lamb;R. Plambeck;M. Pound;S. Scott;N. Scoville;D. Woody
本文报道了在z = 1.2的超亮红外星系GOODS J123634.53+621241.3（也称为亚毫米星系GN 26）中探测到CO（2→1）辐射。这些观测代表了使用新的毫米波天文学研究组合阵列（CARMA）首次发现高红移CO发射。在GOODS-North视场内的所有高红移（z > 1）星系中，该源在斯皮策70和160 μm波段观测到的远红外（FIR）通量最大。CO的红移证实了源的光学识别，明亮的CO（2→1）线表明存在约7 × 1010 M的大分子气藏。L（IR）/L '（CO）= 80 ± 30 L（K km s-1 pc 2）-1的红外与CO光度比略小于局部ULIRG和高红移亚毫米星系中发现的平均比率。短的星星形成时间尺度约为7000万年，这与合并事件相关的恒星爆发相一致，并且比螺旋星系的时间尺度和根据B − z和z − K颜色选择的高红移星系的时间尺度短得多。
We report the detection of CO(2→1) emission from the z = 1.2 ultraluminous infrared galaxy (ULIRG) GOODS J123634.53+621241.3 (also known as the submillimeter galaxy GN 26). These observations represent the first discovery of high-redshift CO emission using the new Combined Array for Research in Millimeter-Wave Astronomy (CARMA). Of all high-redshift (z > 1) galaxies within the GOODS-North field, this source has the largest far-infrared (FIR) flux observed in the Spitzer 70 and 160 μm bands. The CO redshift confirms the optical identification of the source, and the bright CO(2→1) line suggests the presence of a large molecular gas reservoir of about 7 × 1010 M☉. The infrared-to-CO luminosity ratio of L(IR)/L′(CO) = 80 ± 30 L☉ (K km s−1 pc2)−1 is slightly smaller than the average ratio found in local ULIRGs and high-redshift submillimeter galaxies. The short star formation timescale of about 70 Myr is consistent with a starburst associated with the merger event and is much shorter than the timescales for spiral galaxies and estimates made for high-redshift galaxies selected on the basis of their B − z and z − K colors.