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arXiv 0811.4058astro-ph
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邻近星系中心的CI和CO：明亮星系NGC1068（M77）、NGC2146、NGC3079、NGC4826（M64）和NGC7469

CI and CO in nearby galaxy centers: the bright galaxies NGC1068 (M77), NGC2146, NGC3079, NGC4826 (M64), and NGC7469

F. P. Israel

备注：
Accepted for publication by A&A. 15 pages, 9 figures, 7 tables
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摘要：

NGC 1068、NGC 2146、NGC 3079、NGC 4826和NGC 7469中心角分平方中J=1 - 0、J = 2 - 1、J=3-2、J=4-3 ~（12）CO、J=1-0、J=2-1和J=3-2 ~（13）CO谱线的图和测量结果，以及492 GHz [CI]地图在其中三个被用来模拟这些星系的环核分子气体。在所有五个对象中，明亮的CO浓度映射的线强度，需要两个不同的气体成分满意的拟合。分子气体的物理条件因星系而异。在NGC 2146和NGC 3079中出现125-150 K的高动力学温度。在NGC 2146、NGC 3079和NGC 7469中出现0.3-1.0 x 10**5 cm**-3的非常高的密度。CO到H2的转换因子X通常比太阳邻域中的“标准”值小一个数量级。分子气体被限制在距离原子核0.9至1.5 kpc的半径内。在这些半径内，H2的质量通常为1.2-2.5 x 10**8 M（太阳）。例外的是（相对较近的）合并NGC 4826，R=0.3 kpc，M = 3 x 10**7 M（太阳）。在所有五个星系中，H2质量通常约为同一区域动力学质量的1%。

英文摘要：

Maps and measurements of the J=1-0, J=2-1, J=3-2, J=4-3 12CO, the J=1-0, J=2-1, and J=3-2 13CO lines in the central arcminute squared of NGC1068, NGC2146, NGC3079, NGC4826, and NGC7469, as well as 492 GHz [CI] maps in three of these are used to model the circumnuclear molecular gas in these galaxies. In all five objects, the bright CO concentrations mapped have line intensities that require two distinct gas components for satisfactory fits. The physical condition of the molecular gas differs from galaxy to galaxy. High kinetic temperatures of 125-150 K occur in NGC2146 and NGC3079. Very high densities of 0.3-1.0 x 10**5 cm**-3 occur in NGC2146, NGC3079, and NGC7469. The CO to H2 conversion factor X is typically an order of magnitude less than the `standard' value in the Solar Neighborhood. The molecular gas is constrained within radii between 0.9 and 1.5 kpc from the nuclei. Within these radii, H2 masses are typically 1.2-2.5 x 10**8 M(sun). The exception is the (relatively nearby) merger NGC4826 with R=0.3 kpc, and M = 3 x 10**7 M(sun). In all five galaxies, the H2 mass is typically about one per cent of the dynamical mass in the same region.

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