Central Bureau for Astronomical Telegrams
IAUC 7130: 1999au, 1999av, 1999aw, 1999ax, 1999ay
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Circular No. 7130
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVAE 1999au, 1999av, 1999aw, 1999ax, 1999ay
Five new supernova discoveries have been reported -- two by A.
Gal-Yam and D. Maoz (on behalf of the Wise Observatory Optical
Transients Search, at the Wise 1-m reflector; cf. IAUC 7055), and
three on Mar. 9 by L. G. Strolger and R. C. Smith (on behalf of the
Supernova Cosmology Project, at the Kitt Peak 0.9-m telescope; cf.
IAUC 7125, 7128).
SN 1999 UT R.A. (2000.0) Decl. R Offset
1999au Mar. 9 8 58 58.01 - 7 22 09.9 19.2 near center
1999av Mar. 9 10 55 49.70 - 9 20 22.9 18.6 near center
1999aw Mar. 9 11 01 36.37 - 6 06 31.6 17.6 ?
1999ax Mar. 20 14 03 57.92 +15 51 09.2 18.5: 2".9 W, 2".3 N
1999ay Mar. 21 14 44 43.86 +58 55 42.3 18.0: 2".8 W, 2".1 S
CCD spectra of SNe 1999au and 1999aw were obtained by A. Goobar, T.
Dahlen, and I. Hook on Mar. 16 UT at the Nordic Optical Telescope,
from which P. E. Nugent identifies SN 1999au as a type-Ia event
(redshift about 0.124) that is likely to be slightly subluminous,
resembling the type-Ia SN 1986G (SN 1999au was observed about 1
week before peak brightness, apparently near the center of a faint
elliptical galaxy); SN 1999aw is also of type Ia, observed < 1 week
after maximum brightness (redshift about 0.04). Based on spectra
of SN 1999aw obtained by Strolger and Smith on Mar. 17 at the Cerro
Tololo 4-m telescope, M. Phillips suggests that this is likely a
luminous, slow-declining type-Ia supernova; no host is apparent in
the discovery images. C. Lidman obtained a CCD spectrum of SN
1999av on Mar. 13 at the European Southern Observatory 3.6-m
telescope, which shows it to be a type-Ia event at redshift about
0.05, observed 1 week after peak brightness; it is slightly offset
from the core of an elliptical galaxy.
SN 1999ax, in the field of Abell 1852 (z = 0.181), was
invisible in images obtained on 1998 June 25 (limiting mag R about
22.0). A spectrum (range 330-930 nm) of SN 1999ax obtained by G.
Aldering at the Cerro Tololo 4-m reflector on Mar. 22.31 shows a
blue continuum with numerous absorption features (widths about 2000
km/s); Nugent and S. Deustua classify the spectrum as that of a
very early type-II supernova (yielding z = 0.10, which makes it a
foreground object with regard to the galaxy cluster Abell 1852),
similar to that of SN 1979C at 7 days past maximum light. Three
strong features in the spectrum are present at 380, 475, and 518
nm. SN 1999ay, which is in the field of Abell 1966 (z = 0.151),
was confirmed on CCD images taken on Mar. 22 but was invisible in
images obtained on 1998 July 27 (limiting mag R about 21.0).
(C) Copyright 1999 CBAT
1999 March 24 (7130) Daniel W. E. Green
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