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AN EXTREMELY BRIGHT ECHO ASSOCIATED WITH SN 2002hh

机译:与SN 2002hh相关的极其明亮的回声

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We present new, very late time optical photometry and spectroscopy of the interesting Type Ⅱ-P supernova SN 2002hh, in NGC 6946. Gemini /GMOS-N has been used to acquire visible spectra at six epochs between 2004 August and 2006 July, following the evolution of the SN from age 661 to 1358 days. Few optical spectra of Type Ⅱ super-novae with ages greater than 1 yr exist. In addition, g', r', and i' images were acquired at all six epochs. The spectral and photometric evolution of SN 2002hh has been very unusual. Measures of the brightness of this SN, both in the R and I bands, as well as in the Hα emission flux, show no significant fading over an interval of nearly 2 years. The most straightforward explanation for this behavior is that the light being measured comes not only from the SN itself but also from an echo offnearby dust. Echoes have been detected previously around several SNe, but these echoes, at their brightest, were ~8 mag below the maximum brightness of the SN. At V ~ 21 mag, the putative echo dominates the light of SN 2002hh and is only ~4 mag below the outburst's peak brightness. There is an estimated 6 mag of total extinction in V toward SN 2002hh. The proposed explanation of a differential echo/SN absorption is inconsistent with the observed BVRI colors.
机译:我们在NGC 6946中提出了有趣的Ⅱ-P型超新星SN 2002hh的新的非常晚的光学测光和光谱学。在2004年8月至2006年7月之间,Gemini / GMOS-N已被用于获取六个时期的可见光谱。 SN从661岁到1358天的演变。年龄超过1年的Ⅱ型超新星光谱很少。另外,在所有六个时期都采集了g',r'和i'图像。 SN 2002hh的光谱和光度演变非常不寻常。在R和I波段以及在Hα发射通量中,测量该SN的亮度在近两年的时间间隔内都没有明显的衰减。对此行为最直接的解释是,所测量的光不仅来自SN本身,而​​且还来自附近灰尘的回声。先前已经在几个SNe周围检测到回波,但是这些回波最亮的位置比SN的最大亮度低约8 mag。在V〜21 mag时,假定的回波在SN 2002hh的光中占主导地位,并且仅比爆发的峰值亮度低〜4 mag。估计V向SN 2002hh完全灭绝了6 mag。所提出的差分回声/ SN吸收的解释与观察到的BVRI颜色不一致。

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