Central Bureau for Astronomical Telegrams
IAUC 8071: 2003ap; 2003af, 2003ag
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 8072
.dvi or
.ps format.
Circular No. 8071
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)
SUPERNOVA 2003ap
Further to IAUC 8067, W. M. Wood-Vasey, G. Aldering, and P.
Nugent report the discovery of an apparent supernova (mag 16.7) on
unfiltered NEAT images taken with the Palomar 1.2-m Schmidt
telescope on Feb. 9.31, 9.33, and 9.35 UT. SN 2003ap is located at
R.A. = 9h50m52s.83, Decl. = -21o51'10".1 (equinox 2000.0), which is
0".7 west and 0".9 south of the center of the apparent host galaxy.
No point source is visible at this location on NEAT images from
2002 Jan. 1, 2, and 2003 Jan. 12 (limiting mag 19.5).
N. Suntzeff, Cerro Tololo Interamerican Observatory (CTIO),
reports that a CCD spectrogram (range 570-750 nm) of SN 2003ap,
obtained with the CTIO 1.5-m telescope on Feb. 11.20 UT, reveals a
supernova spectrum (consistent with a type-Ia supernova roughly
near or before maximum) that is superimposed on an active-galaxy
spectrum showing a single broad absorption feature that is probably
the Si II doublet at 636 nm, blueshifted by 10400 km/s (in the
frame of the host galaxy). The galaxy redshift is z = 0.030, based
on H-alpha and [S II] 672-nm nuclear emission.
SUPERNOVAE 2003af AND 2003ag
T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm)
of SN 2003af (cf. IAUC 8066), obtained by P. Berlind on Feb. 9.37
UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-Ia supernova near maximum.
Narrow emission lines superposed on the spectrum of the supernova
indicate a recession velocity of 6100 km/s for the host galaxy.
Using this value, the supernova expansion velocity is about 12000
km/s for Si II (rest 635.5 nm). The spectral-feature age of the
supernova is 1 +/- 2 days after maximum light.
Matheson et al. also report that a spectrum of SN 2003ag (cf.
IAUC 8067), obtained as above on Feb. 9.39 UT, shows it to be a
type-Ia supernova near maximum. Adopting the NASA/IPAC
Extragalactic Database recession velocity of 6777 km/s for the host
galaxy, the supernova expansion velocity is 11500 km/s for Si II
(rest 635.5 nm). The spectral-feature age of the supernova is 3
+/- 2 days before maximum light.
Suntzeff adds that a CCD spectrum (range 570-750 nm) of SN
2003ag, obtained at CTIO as above on Feb. 11.25 UT, is consistent
with a type-Ia supernova roughly near maximum light, based on the
strong absorption feature at 625.5 nm. Associating this with the
Si II doublet at 636 nm, the rest-frame expansion velocity of the
supernova would be 11400 km/s.
(C) Copyright 2003 CBAT
2003 February 12 (8071) Daniel W. E. Green
Read IAUC 8072
.dvi or
.ps format.
Our Web policy. Index to the CBAT/MPC/ICQ pages.
