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IAUC 8482: Poss. SN IN NGC 4945; 2005Q, 2005S, 2005Y, 2005Z, 2005ad; 2005R, 2005X,, 2005Y

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IAUC number 

                                                  Circular No. 8482
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)


POSSIBLE SUPERNOVA IN NGC 4945
     C. Jacques and E. Pimentel, Belo Horizonte, Brazil, report
their discovery of an apparent supernova (mag 12.8) on unfiltered
CCD images taken on Feb. 8.22 and 10.23 UT with a 0.30-m Schmidt-
Cassegrain reflector in the course of the CEAMIG/REA Supernovae
Search.  The new object is located at R.A. = 13h04m44s.06, Decl. =
-49o33'59".8 (equinox 2000.0), which is 407" west and 351" south of
the center of NGC 4945, but which also lies in a rather rich area
of foreground Milky Way stars in Centaurus.  Nothing in visible on
a CCD image taken by Jacques on 2004 June 20.93 (limiting mag 18.5)
or on a red Digitized Sky Survey plate from 1976.


SUPERNOVAE 2005Q, 2005S, 2005Y, 2005Z, 2005ad
     N. Morrell, M. Hamuy, and G. Folatelli, Carnegie Supernova
Project; and F. Olivares, University of Chile, report that spectra
(range 380-930 nm) were obtained on Feb. 4 and 8 UT with the Las
Campanas 2.5-m du Pont Telescope (+ WFCCD spectrograph), showing
that SNe 2005Q, 2005Y, 2005Z, and 2005ad (cf. IAUC 8473, 8476, 8479)
are all of type II.  SNe 2005ad, 2005Z, and 2005Q display blue
continua with strong P-Cyg profiles in the Balmer lines and He I
587.6-nm, indicative of young events.  SN 2005ad seems to be very
young, based on the very blue continuum.  SN 2005Y shows the Balmer
lines and the Fe II 516.9-nm absorption, implying a more evolved
event.  The expansion velocities, derived from the minimum of the
H_beta absorption (assuming for the parent galaxies the recession
velocities listed in the NED database) are:  2005Q, 11500 km/s;
2005Y, 6800; 2005Z, 11600; 2005ad, 7400.  A spectrum of SN 2005S
reveals it to be a type-Ia supernova, 2-3 weeks after maximum light.


SUPERNOVAE 2005R, 2005X, AND 2005Y
     R. J. Foley and A. V. Filippenko, University of California,
Berkeley, report that inspection of CCD spectra (range 500-1000 nm),
obtained on Feb. 11 UT with the Keck II 10-m telescope (+ DEIMOS),
shows that SN 2005R (IAUC 8473) is of type IIn; the broad H_alpha
emission line has a full-width-at-half-maximum of about 2400 km/s.
SN 2005X (IAUC 8476) is of type Ia, about 2 weeks past maximum
brightness; the redshift of its host galaxy is measured to be z =
0.0745.  SN 2005Y (IAUC 8476) is of type II, showing a prominent
H_alpha P-Cyg profile.  After removing the host-galaxy recession
velocity of 4900 km/s (from NED), the minimum of the broad H_alpha
absorption is measured to be -7400 km/s relative to its rest
wavelength.

                      (C) Copyright 2005 CBAT
2005 February 11               (8482)            Daniel W. E. Green

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