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[vsnet-campaign-sn 205] SN 2001cj in UGC 8399
Dear SN watchers,
The KAIT discovered a bright SN Ia 2001cj. The host galaxy belongs
a "group" defined by the resemblance of the redshifts, and there is a
great concern of its distance.
SN 2001cj was discovered and confirmed on May 30.3 UT and 31.3 UT,
when SN was mag about 15.9 and 15.7. The position is R.A. =
13h21m44s.85, Decl. = +31o14'48".6 (2000.0), which is about 7" west
and 35" north of the nucleus of a barred-spiral (SB(r)b) galaxy UGC
8399. It is well outside of the disk of the galaxy, and no
neighbouring foreground star brighter than mag 18 are there around 1'
from the nucleus of UGC 8399. The spectrum of this SN indicates that
it is of type Ia before optical maximum (on June 1).
Interestringly, this galaxy is included by the famous "fan-shaped
figure" of the CfA redshift survey illustrated by Geller or Huchra,
and is one of the member of the "human-shaped" region. From the CfA
survey, Ramella, Geller and Huchra (1989, ApJ, 344, 57 and 1995, AJ,
109, 1458) suggest that UGC 8399 is a member of the "group 81" whose
mean v_r is about 7200 km/s. The expected maximum of typical SN Ia is
around mag 16.5, which is far dimmer than one at discovery.
Meanwhile, the same literature shows that the "group 82" (v_r = 5100
km/s) lies foreground of group 81. If the distance of SN 2001cj
corresponds to the recession velocity of group 82, the expected
maximum is mag about 15.7. It is quite important to determine whether
SN 2001cj is intrinsically bright (slow decliner) or is normal one.
It can probe the true distance of the group 81. The followup
photometry is very urged.
Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp
vsnet-adm@kusastro.kyoto-u.ac.jp
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