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首页> 外文期刊>The Astrophysical journal >RADIO AND IRAS OBSERVATIONS OF TWO NEBULAE AROUND WO STARS: G2.4+1.4 IN THE GALAXY AND SANDAGE H Ⅱ REGION 3 IN IC 1613
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RADIO AND IRAS OBSERVATIONS OF TWO NEBULAE AROUND WO STARS: G2.4+1.4 IN THE GALAXY AND SANDAGE H Ⅱ REGION 3 IN IC 1613

机译：IC 1613中银河和砂砾HⅡ区3中围绕星云的两个星云的放射和IRAS观测：G2.4 + 1.4

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摘要

We present new VLA and IRAS observations of two H Ⅱ regions around WO stars: G2.4+1.4 associated with WR 102 in the Galaxy and the Sandage H Ⅱ region 3 around the WO star in the Local Group galaxy IC 1613. A radio image of G2.4+1.4 was made with a resolution of approximately 0.3 pc using the VLA at 1.49 GHz. The radio source shows a thin filamentary shell of 9 x 10 pc (wind-blown bubble) superposed on a more diffuse H Ⅱ region of about 13-14 pc; the radio shell extends farther to the N and W than indicated by previous radio observations. The radio morphology is in excellent agreement with the deep Hα images. The radio source has a thermal spectrum. The mass of the ionized gas in the shell is about 100 solar mass, and that of the diffuse H Ⅱ region is about 150-170 solar mass. IRAS FRESCO images show a prominent source G2.4+1.4 at all IRAS bands. The source at 60 and 100 μm agrees in shape and position with the bright part of the optical and radio shell. If we assign the IRAS flux densities to heated dust rather than atomic lines, the mass of inferred gas is in reasonable agreement with the values derived from the 1.49 GHz data. There is a large shell-like IR feature ~35 pc in size with G2.4+1.4 and WR 102 located at its brightest and hottest edge. A thermal radio source with the flux density ～0.6 mJy has been detected from the Sandage H Ⅱ region 3 around the WO star in IC 1613. With a mean density of 3.5 cm~(-3), an emission measure of 1.1 x 10~3 pc cm~(-6) cm, and a mass of ionized gas of 2.8 x 10~4 solar mass, this object is similar to many of the low-luminosity H Ⅱ regions in the LMC. The WO star could be the only source of ionization. IRAS FRESCO images of the galaxy IC 1613 show a giant complex of dust and gas 2-3 kpc in size. This complex includes a region of active star formation with a supernova remnant, all known WR stars, and the majority of the giant H Ⅱ regions in the galaxy. The southern component of the IR complex encompasses the WO nebula Sandage 3.
机译：我们提出了新的VLA和IRAS观测，观测了WO星附近的两个HⅡ区：银河中WR 102的G2.4 + 1.4和本地群星系IC 1613中WO星周围的Sandage HⅡ区域3。使用1.49 GHz的VLA以大约0.3 pc的分辨率制作了G2.4 + 1.4。无线电源显示出一个9 x 10 pc的细丝状外壳（风吹泡），重叠在约13-14 pc的更扩散的HⅡ区域上。无线电壳比以前的无线电观测所指示的延伸到N和W更远。无线电形态与深层Hα图像高度吻合。无线电源具有热频谱。壳中的离子化气体的质量约为100太阳质量，而扩散HⅡ区的质量约为150-170太阳质量。 IRAS FRESCO图像在所有IRAS频段上均显示了G2.4 + 1.4的突出来源。 60和100μm的光源的形状和位置与光学和无线电外壳的明亮部分一致。如果我们将IRAS通量密度分配给加热的尘埃而不是原子线，则推断气体的质量与从1.49 GHz数据得出的值在合理范围内一致。有一个大的类似于外壳的IR功能，大小约为35 pc，G2.4 + 1.4和WR 102位于其最亮和最热的边缘。在IC 1613中，从WO星周围的Sandage HⅡ区3探测到一个通量密度为〜0.6 mJy的热无线电源。其平均密度为3.5 cm〜（-3），发射量为1.1 x 10〜。 3 pc cm〜（-6）cm，质量为2.8 x 10〜4太阳质量的电离气体，该物体类似于LMC中的许多低发光HⅡ区。 WO星可能是电离的唯一来源。星系IC 1613的IRAS FRESCO图像显示了大小为2-3 kpc的巨大尘埃和气体复合物。这个复杂的区域包括一个活跃的恒星形成区域和一个超新星遗迹，所有已知的WR恒星，以及银河系中大部分的HⅡ大区域。红外复合体的南部部分包括WO星云Sandage 3。

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