{"title":"福克德-菲格罗亚星系中形成核的证据","authors":"H. Dottori and R. J. Díaz","doi":"10.3847/1538-4357/ad79fd","DOIUrl":null,"url":null,"abstract":"We analyze data from the IRAS, Wide-field Infrared Survey Explorer, and Planck satellites, revealing an unresolved dust condensation at the center of the Fourcade–Figueroa galaxy (ESO270-G017), which may correspond to a forming nucleus. We model the condensation’s continuum spectrum in the spectral range from 3 to 1300 μm using the DUSTY code. The best-fit model, based on the chi-square test, indicates that the condensation is a shell with an outer temperature of Tout ≈ 12 K and an inner boundary temperature of Ti ≈ 500 K. The shell’s outer radius is ro = 86.2 pc, and the inner cavity radius is ri = 0.082 pc. The condensation produces an extinction AV = 50 mag, and its luminosity is Lc = 1.08 × 1034 W, which would correspond to a burst of massive star formation approximately similar to the central 5 pc of R 136 in the LMC and NGC 3603, the ionizing cluster of a giant Carina arm H ii region. The comparison with normal, luminous, and ultraluminous IR galaxies leads us to consider this obscured nucleus as the nearest and weakest object of this category.","PeriodicalId":501813,"journal":{"name":"The Astrophysical Journal","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Evidence of a Forming Nucleus in the Fourcade–Figueroa Galaxy\",\"authors\":\"H. Dottori and R. J. Díaz\",\"doi\":\"10.3847/1538-4357/ad79fd\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We analyze data from the IRAS, Wide-field Infrared Survey Explorer, and Planck satellites, revealing an unresolved dust condensation at the center of the Fourcade–Figueroa galaxy (ESO270-G017), which may correspond to a forming nucleus. We model the condensation’s continuum spectrum in the spectral range from 3 to 1300 μm using the DUSTY code. The best-fit model, based on the chi-square test, indicates that the condensation is a shell with an outer temperature of Tout ≈ 12 K and an inner boundary temperature of Ti ≈ 500 K. The shell’s outer radius is ro = 86.2 pc, and the inner cavity radius is ri = 0.082 pc. The condensation produces an extinction AV = 50 mag, and its luminosity is Lc = 1.08 × 1034 W, which would correspond to a burst of massive star formation approximately similar to the central 5 pc of R 136 in the LMC and NGC 3603, the ionizing cluster of a giant Carina arm H ii region. The comparison with normal, luminous, and ultraluminous IR galaxies leads us to consider this obscured nucleus as the nearest and weakest object of this category.\",\"PeriodicalId\":501813,\"journal\":{\"name\":\"The Astrophysical Journal\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-10-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Astrophysical Journal\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.3847/1538-4357/ad79fd\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Astrophysical Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3847/1538-4357/ad79fd","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
我们分析了来自IRAS、宽视场红外巡天探测器和普朗克卫星的数据,发现在福克多-费格罗亚星系(ESO270-G017)的中心有一个未解决的尘埃凝聚体,它可能相当于一个正在形成的星系核。我们利用 DUSTY 代码在 3 到 1300 μm 光谱范围内建立了这个凝聚体的连续光谱模型。基于卡方检验的最佳拟合模型表明,凝结体是一个外壳,其外部温度为 Tout ≈ 12 K,内部边界温度为 Ti ≈ 500 K。冷凝产生的消光为 AV = 50 mag,光度为 Lc = 1.08 × 1034 W,这相当于一次大质量恒星形成的爆发,与 LMC 中 R 136 的中心 5 pc 和巨型卡丽娜臂 H ii 区域的电离团 NGC 3603 大致相似。通过与正常、发光和超发光红外星系的比较,我们认为这个被遮挡的星核是这一类星系中最接近也是最弱的天体。
Evidence of a Forming Nucleus in the Fourcade–Figueroa Galaxy
We analyze data from the IRAS, Wide-field Infrared Survey Explorer, and Planck satellites, revealing an unresolved dust condensation at the center of the Fourcade–Figueroa galaxy (ESO270-G017), which may correspond to a forming nucleus. We model the condensation’s continuum spectrum in the spectral range from 3 to 1300 μm using the DUSTY code. The best-fit model, based on the chi-square test, indicates that the condensation is a shell with an outer temperature of Tout ≈ 12 K and an inner boundary temperature of Ti ≈ 500 K. The shell’s outer radius is ro = 86.2 pc, and the inner cavity radius is ri = 0.082 pc. The condensation produces an extinction AV = 50 mag, and its luminosity is Lc = 1.08 × 1034 W, which would correspond to a burst of massive star formation approximately similar to the central 5 pc of R 136 in the LMC and NGC 3603, the ionizing cluster of a giant Carina arm H ii region. The comparison with normal, luminous, and ultraluminous IR galaxies leads us to consider this obscured nucleus as the nearest and weakest object of this category.