利用MERLIN在旋涡星系NGC3351内和周围进行亚弧秒射电连续谱测绘
Sub-arcsecond radio continuum mapping in and around the spiral galaxy NGC3351 using MERLIN
摘要：
我们报告的亚弧秒尺度的无线电连续观测场的35 22弧分中心的NGC3351获得的多元无线电链接干涉仪网络（MERLIN）。我们在这个区域发现了23个射电源，其中6个投射在星系的D $_{25}$等照度线内，3个位于中心半径100弧秒内。这三个中的两个显著延长，而第三个相对紧凑。这是唯一一个在其他波长上有先前探测到的对应物的源，并且可能构成年轻超新星遗迹的无线电对应物。另外两个可能与背景活动星系核的喷流有关。我们无法在星系的中心区域（$r<600$ pc）探测到单个超新星或SNRs。这可能意味着，环核恒星形成区（CNSFR）的电离人口太年轻（不到几百万年），不适合容纳超新星。此外，相对论电子在ISM中的扩散长度与SN从以前的恒星形成的事件似乎是大于我们的最大分辨率为50 pc的半径。探测环核HII区的热韧致辐射可能需要更深入的观测。
英文摘要：
We report sub-arcsecond scale radio continuum observations of a field of 35 by 22 arcmin centred in NGC3351 obtained with the Multi-Element Radio Linked Interferometer Network (MERLIN). We found 23 radio sources in this field, 6 of which are projected within the D$_{25}$ isophote of the galaxy, and 3 are located inside the central 100 arcsec in radius. Two of these three are significantly extended, while the third one is relatively compact. This one is the only source with a previously detected counterpart at other wavelengths and could constitute the radio counterpart of a young supernova remnant. The other two are probably related to jets from a background AGN. We are not able to detect individual supernovae or SNRs in the central region ($r<600$ pc) of the galaxy. This could imply that the ionising populations of the circumnuclear star-forming regions (CNSFRs) are too young (less than a few Myr) to host supernovae. Also the diffusion length of the relativistic electrons in the ISM associated with the SN from previous events of star formation seems to be larger than our maximum resolution of 50 pc in radius. Detecting the thermal bremsstrahlung emission from the circumnuclear HII regions probably requires deeper observations.
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