A search for extragalactic H₂O maser emission towards IRAS galaxies – II. Discovery of an H₂O maser in the type 1 Seyfert galaxy NGC 4051     

Yoshiaki Hagiwara  Philip J. Diamond  Makoto Miyoshi  Emmanouel Rovilos  Willem Baan 《Monthly notices of the Royal Astronomical Society》2003,344(4):L53-L57

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The 18-cm light curves of the luminous radio supernova candidates in Arp 220     

E. Rovilos  P. J. Diamond  C. J. Lonsdale  H. E. Smith  C. J. Lonsdale 《Monthly notices of the Royal Astronomical Society》2005,359(3):827-834

We present multi-epoch observations of Arp 220 with the VLBA and focus on the continuum emission from the luminous radio supernovae (RSNe) whose 1.6-GHz light curves are shown. The supernovae seem to be generally stable or only slowly decaying in flux with time, a result which deviates from the model of Type IIn RSNe. Hints of new eruptions confirm that they are indeed new sources and not supernova remnants, which could be several hundred years old. The slow decay of the sources for which monitoring data were available forces us to reconsider the starburst model for Arp 220 and adopt a more modest value of 0.7 yr⁻¹ for the supernova rate based on these new eruptions. The starburst efficiency should also be modified accordingly which gives rise to the issue of an active nucleus once more. The question is raised whether it is the starburst which creates this active nucleus, something which could affect the evolution of starburst galaxies as a group.  相似文献   

Continuum and spectral line observations of the OH Megamaser galaxy Arp 220     

E. Rovilos  P. J. Diamond  C. J. Lonsdale  C. J. Lonsdale  H. E. Smith 《Monthly notices of the Royal Astronomical Society》2003,342(2):373-382

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