冲击增强[C ii]星系Arp 25的辐射

IF 4.8 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/acfca1

Dario Fadda, Jessica S. Sutter, Robert Minchin, Fiorella Polles

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引用次数: 0

摘要

摘要:我们利用HAWC+和FIFI-LS对特殊星系Arp 25(也被称为NGC 2276或UGC 3740)进行了SOFIA观测，该星系的形态受到NGC 2300星系群内部介质的影响而发生了变形。这些观测结果首次直接证明了[C ii]辐射的增强是由一群星系中的撞击压力引起的冲击引起的。通过比较银河系不同区域的[C ii]发射与紫外线衰减、尘埃发射、多环芳烃和CO发射，我们发现[C ii]发射沿撞击锋与群内介质明显过量。我们估计，仅假设由恒星辐射引起的激发，与预测的[C ii]发射相比，由群内介质撞击引起的激波使沿激波锋面的[C ii]发射增加了60%，使全球[C ii]发射增加约25%。这一结果表明，将[C ii]发射解释为与恒星形成直接相关是危险的，因为冲击和其他机制可以显著地促进星系群和星团的[C ii]总发射。

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Shock Enhanced [C ii] Emission from the Infalling Galaxy Arp 25 ^∗

Abstract We present SOFIA observations with HAWC+ and FIFI-LS of the peculiar galaxy Arp 25, also known as NGC 2276 or UGC 3740, whose morphology is deformed by its impact with the intragroup medium of the NGC 2300 galaxy group. These observations show the first direct proof of the enhancement of [C ii ] emission due to shocks caused by ram pressure in a group of galaxies. By comparing the [C ii ] emission to UV attenuation, dust emission, PAH, and CO emission in different regions of the galaxy, we find a clear excess of [C ii ] emission along the impact front with the intragroup medium. We estimate that the shock due to the impact with the intragroup medium increases the [C ii ] emission along the shock front by 60% and the global [C ii ] emission by approximately 25% with respect to the predicted [C ii ] emission assuming only excitation caused by stellar radiation. This result shows the danger of interpreting [C ii ] emission as directly related to star formation since shocks and other mechanisms can significantly contribute to the total [C ii ] emission from galaxies in groups and clusters.

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来源期刊

Astrophysical Journal 地学天文-天文与天体物理

CiteScore

8.40

自引率

30.60%

发文量

2854

审稿时长

1 months

期刊介绍： The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.