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arXiv 1104.4115astro-ph.CO
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多透镜星系HLSW-01的红移测定和CO线激发模型

Redshift Determination and CO Line Excitation Modeling for the Multiply-Lensed Galaxy HLSW-01

K. S. Scott, R. E. Lupu, J. E. Aguirre, R. Auld, H. Aussel, A. J. Baker, A. Beelen, J. Bock, C. M. Bradford, D. Brisbin, D. Burgarella, J. M. Carpenter, P. Chan… 展开作者

K. S. Scott, R. E. Lupu, J. E. Aguirre, R. Auld, H. Aussel, A. J. Baker, A. Beelen, J. Bock, C. M. Bradford, D. Brisbin, D. Burgarella, J. M. Carpenter, P. Chanial, S. C. Chapman, D. L. Clements, A. Conley, A. Cooray, P. Cox, C. D. Dowell, S. Eales, D. Farrah, A. Franceschini, D. T. Frayer, R. Gavazzi, J. Glenn, M. Griffin, A. I. Harris, E. Ibar, R. J. Ivison, J. Kamenetzky, S. Kim, M. Krips, P. R. Maloney, H. Matsuhara, A. M. J. Mortier, E. J. Murphy, B. J. Naylor, R. Neri, H. T. Nguyen, S. J. Oliver, A. Omont, M. J. Page, A. Papageorgiou, C. P. Pearson, I. Perez-Fournon, M. Pohlen, J. I. Rawlings, G. Raymond, D. Riechers, G. Rodighiero, I. G. Roseboom, M. Rowan-Robinson, D. Scott, N. Seymour, A. J. Smith, M. Symeonidis, K. E. Tugwell, M. Vaccari, J. D. Vieira, L. Vigroux, L. Wang, G. Wright, J. Zmuidzinas

摘要:

我们报告的红移测量和CO线激发的HERMES J105751.1+573027(HLSW-01),一个强透镜的亚毫米星系中发现的赫歇尔/SPIRE观测的一部分,赫歇尔多层河外巡天(HerMES)。HLSW-01是一个超亮星系,其固有远红外光度为1.4 × 10 ^(13)太阳光度,并被一个巨大的星系群透镜化成至少四张总放大率为10.9+/-0.7的图像。利用加州理工学院亚毫米波天文台的Z-Spec仪器的100 GHz瞬时带宽,我们使用四条CO发射线(J = 7-6,J = 8-7,J = 9-8和J = 10-9)的同时检测,稳健地确定了该源的红移z=2.958+/-0.007。结合这些高J转换的测量线通量与J = 1-0,J = 3-2和J = 5-4线通量测量的绿岸望远镜,毫米天文学研究组合阵列,和高原德布雷干涉仪,分别,我们模型的分子气体在这个星系的物理性质。我们发现,CO谱线的全谱线能量分布可以用温度为86-235 K,n(H2)=(1.1-3.5)× 10^3 cm^(-3)的温暖的中等密度气体来描述。然而,最高J跃迁有可能是追踪分子云核心中一小部分非常致密的气体,而包含Tkin ~ 200 K、n(H2)~ 10^5 cm^(-3)的温暖/致密分子气相的双组分模型也与这些数据一致。需要高光谱分辨率的J(上)> 7跃迁的更高信噪比测量,结合高空间分辨率的CO图,以提高我们对这个有趣的高红移星系的气体激发,形态和动力学的理解。

英文摘要:

We report on the redshift measurement and CO line excitation of HERMES J105751.1+573027 (HLSW-01), a strongly lensed submillimeter galaxy discovered in Herschel/SPIRE observations as part of the Herschel Multi-tiered Extragalactic Survey (HerMES). HLSW-01 is an ultra-luminous galaxy with an intrinsic far-infrared luminosity of 1.4x10^(13) solar luminosities, and is lensed by a massive group of galaxies into at least four images with a total magnification of 10.9+/-0.7. With the 100 GHz instantaneous bandwidth of the Z-Spec instrument on the Caltech Submillimeter Observatory, we robustly identify a redshift of z=2.958+/-0.007 for this source, using the simultaneous detection of four CO emission lines (J = 7-6, J = 8-7, J = 9-8, and J = 10-9). Combining the measured line fluxes for these high-J transitions with the J = 1-0, J = 3-2 and J = 5-4 line fluxes measured with the Green Bank Telescope, the Combined Array for Research in Millimeter Astronomy, and the Plateau de Bure Interferometer, respectively, we model the physical properties of the molecular gas in this galaxy. We find that the full CO spectral line energy distribution is well described by warm, moderate-density gas with Tkin = 86-235 K and n(H2) = (1.1-3.5)x10^3 cm^(-3). However, it is possible that the highest-J transitions are tracing a small fraction of very dense gas in molecular cloud cores, and two-component models that include a warm/dense molecular gas phase with Tkin ~ 200 K, n(H2) ~ 10^5 cm^(-3) are also consistent with these data. Higher signal-to-noise measurements of the J(upper) > 7 transitions with high spectral resolution, combined with high spatial resolution CO maps, are needed to improve our understanding of the gas excitation, morphology, and dynamics of this interesting high-redshift galaxy.

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。

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