恒星形成与邻近潮汐流中的星际介质（SAINTS）
Star Formation and the Interstellar Medium in Nearby Tidal Streams (SAINTS)
摘要：
比较了斯蒂芬五重星系中SQ-A和SQ-B、Arp 105中Ambartzumian结、Arp 242-N3、Arp 87-N1、桥星形成区、NGC 5291 N和NGC 5291 S的Spitzer红外光谱观测结果。多环芳烃往往主要是中性颗粒，具有50 - 100个碳原子的典型尺寸。星际辐射场比典型的星暴星系更硬，类似于矮星系。氖线比率与最近的恒星形成事件相一致。我们在SQ-A、Arp 87 N1和SQ-B中检测到暖H2。使用我们14个相互作用系统的8 um图像，我们识别出62个潮汐星形成结（TSFK）。估计的恒星质量范围从超级星团（10^4-10^6 Msun）到TDG（~10^9 Msun）。恒星质量，有一些散射，与8微米的光度成比例，往往比KISS的恒星形成矮星样本小一个数量级。一个例外是Arp 242中更大的TSFK。TSFK在中红外颜色图中形成两个不同的团块。有38个红色TSFK具有[4.5] - [8.0] > 3和[3.6] - [4.5] < 0.4。这些人口显着增强了非恒星的排放，最有可能是由于多环芳烃和/或热尘埃。第二组21个源的颜色为1.2 < [4.5] - [8.0] < 3和[3.6] - [4.5] < 0.4，这些颜色类似于形成恒星的矮星系和旋涡星系。红色的[4.5] - [8.0]总体倾向于具有8-24 um SED上升的源，而蓝色总体倾向于包含SED下降的源。上升的SED是典型的螺旋星系和星暴星系，占主导地位的40 - 60 K的尘埃成分和下降的SED可能表明占主导地位的热尘埃成分。
英文摘要：
We compare Spitzer Infrared Spectrograph observations of SQ-A & SQ-B in Stephan's Quintet, Ambartzumian's knot in Arp 105, Arp 242-N3, Arp 87-N1, a bridge star forming region, NGC 5291 N and NGC 5291 S. The PAHs tend to be mainly neutral grains with a typical size of 50 - 100 carbon atoms. The interstellar radiation field is harder than typical starburst galaxies, being similar to that found in dwarf galaxies. The neon line ratios are consistent with a recent episode of star formation. We detect warm H2 in SQ-A, Arp 87N1 and SQ-B. Using our 8 um images of 14 interacting systems we identify 62 tidal star forming knots (TSFKs). The estimated stellar masses range from super star cluster (10^4-10^6 Msun) to TDG (~10^9 Msun) sizes. The stellar mass, with some scatter, scales with the 8 um luminosity and tends to be an order of magnitude smaller than the KISS sample of star forming dwarfs. An exception to this are the more massive TSFKs in Arp 242. The TSFKs, form two distinct clumps in a mid-infrared color diagram. There are 38 red-TSFKs with [4.5] - [8.0] > 3 and [3.6] - [4.5] < 0.4. This populations has significantly enhanced non-stellar emission, most likely due to PAHs and/or hot dust. The second group of 21 sources has 1.2 < [4.5] - [8.0] < 3 and [3.6] - [4.5] < 0.4, these colors are similar to star forming dwarf and spiral galaxies. The redder [4.5] - [8.0] population tends to have the sources with a rising 8-24 um SED while the blue population tends to contain the sources with a descending SED. The rising SED is typical of spiral and starburst galaxies with a dominant 40 - 60 K dust component and the declining SED probably indicates a dominant hot dust component.
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