IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8707: 2006bq, 2006bu, 2006by, 2006bz, 2006ca

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 8706  SEARCH Read IAUC 8708

View IAUC 8707 in .dvi, .ps or .PDF format.
IAUC number


                                                  Circular No. 8707
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVAE 2006bq, 2006bu, 2006by, 2006bz, 2006ca
     Three additional supernovae have been found in LOSS/KAIT images
(cf. IAUC 8705) by E. Lee, R. Chornock, J. Burket, M. Baek, and W.
Li:

SN      2006 UT     R.A.  (2000.0)  Decl.    Mag.     Offset
2006by  May 3.31   13 26 09.12  +35 55 58.0  18.2  0".1 E, 5".7 S
2006bz  May 4.30   13 00 43.38  +27 57 41.8  17.5  7".0 E, 5".9 S
2006ca  May 4.49   18 22 54.15  +12 26 03.2  16.4  14".0 E, 17".3 N

Additional magnitudes for 2006by in NGC 5149:  Feb. 9.50 UT, [19.0;
May 4.31, 18.2.  Additional magnitudes for 2006bz in PGC 44809 (in
Abell Cluster 1656):  Jan. 13.46, [18.5; Feb. 5.43, [18.0; May 5.37,
17.1.  Additional magnitudes for 2006ca in UGC 11214:  2005 Oct.
5.19, [19.0; 2006 Apr. 14.53, [17.0; May 5.40, 16.1.  Additional
KAIT magnitudes for 2006bq (cf. IAUC 8705):  2005 Oct. 5.20, [19.5;
2006 May 4.52, 16.8; 5.40, 17.0.
     R. J. Foley, J. M. Silverman, M. Moore, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD
spectra (range 330-1040 nm), obtained on May 5 UT with the Lick 3-m
telescope (+ Kast), shows that SNe 2006bq and 2006bu (cf. IAUC 8705)
are of type Ia at about 20 and 0 days past maximum brightness,
respectively.  Spectra of SNe 2006by and 2006ca reveal they are both
of type II.  The spectrum of SN 2006ca shows a very blue continuum
with weak Balmer absorption lines, indicating that it is a young
object.  After removing the recession velocity of 5680 and 2670 km/s
determined from narrow emission lines, the minima of the H_alpha
P-Cyg absorption is seen to have velocities of 7600 and 17200 km/s
for SNe 2006by and 2006ca, respectively.  A spectrum of SN 2006bz
shows it to be of type Ia, resembling SN 1991bg (Filippenko et al.
1992, A.J. 104, 1543) at maximum light; removing the host-galaxy
recession velocity of 8366 km/s (Caldwell et al. 1992, A.J. 106,
473), the minimum of the Si II 6150 absorption is measured to be
10800 km/s.
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis,
Harvard-Smithsonian Center for Astrophysics, report that a
spectrum (range 350-740 nm) of 2006bu, obtained on May 5.19 UT by
W. Peters with the Mt. Hopkins 1.5-m telescope (+ FAST), shows it
to be a type-Ia supernova with a spectral-feature age (Riess et al.
1997, A.J. 114, 722) of 2 days past maximum.  Cross-correlation
with a library of type-Ia-supernova spectra indicates that 2006bw
is at a redshift of cz approximately 25000 km/s.  Adopting this
recession velocity for the supernova, the maximum absorption in the
Si II line (rest 635.5 nm) is blueshifted by 11500 km/s.

                      (C) Copyright 2006 CBAT
2006 May 5                     (8707)            Daniel W. E. Green

Read IAUC 8706  SEARCH Read IAUC 8708

View IAUC 8707 in .dvi, .ps or .PDF format.


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!