利用 CO 同素异形体计算银河系中央分子区的 CO-H2 转换系数

IF 2.2 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Japan Pub Date : 2024-05-22 DOI:10.1093/pasj/psae033

Mikito Kohno, Yoshiaki Sofue

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引用次数: 0

摘要

我们对12CO和13CO J = 1-0线强度进行了相关分析，以得出银河系中央分子区（CMZ）的CO-H2转换因子（XCO,iso）的变化情况。我们利用野边山45米望远镜获得的12CO和13CO档案巡天数据，绘制了新的分辨率为30″的高分辨率XCO,iso图和分辨率为2$ km s-1的经向速度图（LVD）。如果假设归一化值为 0.59 × 1020 cm-2 (K km s-1)-1，我们揭示了 CMZ 中 XCO,iso ∼ (0.2-1.3) × 1020 cm-2 (K km s-1)-1 范围内的变化。在银河系的 CMZ 中，平均值为 XCO,iso = (0.48 ± 0.15) × 1020 cm-2 (K km s-1)-1。

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The CO-to-H2 conversion factor in the Central Molecular Zone of the Milky Way using CO isotopologues

We performed correlation analyses between the 12CO and 13CO J = 1–0 line intensities in order to derive the variability of the CO-to-H2 conversion factor (XCO,iso) in the central molecular zone (CMZ) of our Galaxy. New high-resolution XCO,iso maps at a resolution of ∼30″ and a longitude–velocity diagram (LVD) at resolution ${\sim }{30^{\prime\prime}}\times 2$ km s−1 are presented using the 12CO and 13CO archival survey data obtained by the Nobeyama 45 m telescope. We revealed the variation of XCO,iso in the CMZ within the range of XCO,iso ∼ (0.2–1.3) × 1020 cm−2 (K km s−1)−1, if we assume a normalization value of 0.59 × 1020 cm−2 (K km s−1)−1. The mean value is obtained as XCO,iso = (0.48 ± 0.15) × 1020 cm−2 (K km s−1)−1 in the CMZ of our Galaxy.

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来源期刊

Publications of the Astronomical Society of Japan 地学天文-天文与天体物理

CiteScore

4.10

自引率

13.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.