在VCC1249和M49相遇时作为新形成的HII区的燃料的汽提气：来自NGVS和GUViCS的统一图象
Stripped gas as fuel for newly formed HII regions in the encounter between VCC1249 and M49: a unified picture from NGVS and GUViCS
摘要：
背景：我们研究了位于室女座B子星系团核心的VCC 1249/M49这一特殊的相互作用星系系统。由于矮星系VCC 1249和gE M49的晕气体之间最近的相互作用，中性氢已经从矮星系的星际介质转移到室女座ICM中。观测还揭示了多个紧凑的恒星形成区域，这些区域嵌入在HI云中，预计在西北方向与VCC 1249的距离可达13 kpc。目的：最近的NUV成像的VCC 1249/M49系统，显示显着的正在进行/最近的恒星形成的紧凑的区域，我们的目标是约束这些边远的HII区域的起源与多波长的方法。研究方法：使用深光学（u，g，i，z）成像从NGVS和新的Halpha成像在圣佩德罗Martir天文台与凯克长缝光谱一起获得，我们表征的SFR，年龄和金属丰度的VCC 1249和其外围紧凑的区域。此外，我们还分析了该星系的颜色和光度轮廓，以研究其与M49的近期相互作用。结果如下：我们的新观测结果表明，VCC 1249经历了最近的相互作用与M49，其中既冲压压力剥离和潮汐相互作用发生。这两种机制的共同作用导致了HI气体从VCC 1249的ISM中移除，而引力潮汐则触发了VCC 1249的星尾和反尾。我们的SED分析显示，该星系中的恒星形成在大约2亿年前被截断，而外围的HII区域在大约1000万年前从矮星系中移除的预富集气体中原位诞生。这些观测还揭示了类似于VCC 1249/M49之间的中心星系和卫星星系之间的相互作用可能是将金属分散到大质量星系晕中的有效方式。
英文摘要：
Context: We study the peculiar interacting galaxy system of VCC1249/M49 located in the core of the Virgo B subcluster. Owing to a recent interaction between the dwarf galaxy VCC1249 and the halo gas of the gE M49, neutral hydrogen has been displaced from the interstellar medium of this dwarf into the Virgo ICM. Observations also reveal multiple compact star-forming regions that are embedded in this HI cloud, with a projected separation up to 13 kpc from VCC1249 in the northwest direction. Aims: Motivated by recent NUV imaging from GUViCS of the VCC1249/M49 system that shows significant ongoing/recent star formation in the compact regions, we aim to constrain the origin of these outlying HII regions with a multi-wavelength approach. Methods: Using deep optical (u, g, i, z) imaging from NGVS and new Halpha imaging obtained at the San Pedro Martir observatory together with Keck long-slit spectroscopy, we characterize the SFR, ages, and metallicity of VCC1249 and its outlying compact regions. Moreover, we analyze the color and luminosity profile of the galaxy to investigate its recent interaction with M49. Results: Our new observations indicate that VCC1249 underwent a recent interaction with M49 in which both ram-pressure stripping and tidal interaction occured. The joint action of the two mechanisms led to the removal of the HI gas from the ISM of VCC1249, while the gravitational tides triggered the stellar tail and counter-tail of VCC1249. Our SED analysis reveals that the star formation in this galaxy was truncated around 200 Myr ago and that the outlying HII regions were born in situ about 10 Myr ago out of pre-enriched gas removed from the dwarf galaxy. These observations also reveal that interactions between central and satellite galaxies similar to the one between VCC1249/M49 may be an effective way of dispersing metals into the halos of massive galaxies.
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。
