Central Bureau for Astronomical Telegrams
IAUC 3202: 1978c; MCG -5-23-16; MCG -6-30-15
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Read IAUC 3203
Circular No. 3202
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK Telex: 921428
Telephone: (617) 864-5758
COMET BRADFIELD (1978c)
E. P. Ney and D. A. Brodzik, University of Minnesota, report
infrared magnitudes (average values) obtained at the O'Brien Observatory
on Mar. 16.7 and 17.7 UT with a diaphragm 27" in diameter (cf.
IAUC 3189): 1.6 um, 7.2; 2.2 um, 5.9; 3.6 um, 2.8; 4.8 um, 0.9; 8.5 um,
-1.8; 10.6 um, -2.3; 12.5 um, -2.6; 18 um, -3.5.
Total visual magnitude estimates: Mar. 16.52 UT, 5.8 (P. L.
Collins, Tucson, Arizona, 11 x 80 binoculars; 1o tail in p.a. 280o);
20.41, 5.2 (J. Bortle, Brooks Observatory, 10 x 50 binoculars);
25.49, 5.5 (P. Maley, San Antonio, Texas, 13-cm refractor).
MCG -5-23-16
M. Davis, J. Huchra, J. Tonry and D. Latham, Center for Astrophysics,
report spectroscopic observations of MCG -5-23-16 (not MCG
5-23-16 as given on IAUC 3190 and 3194), the galaxy at the SAS-3
position for 4U 0945-30 and 2A 0946-310. The galaxy has a redshift
of 2466 +/- 12 km/s (heliocentric) and Mpg = -20. Sharp,
intermediate-strength emission lines of [O III], [N II] and H-alpha are seen
along with strong Mg, Fe and Ca absorption features characteristic
of a normal blue stellar continuum in a galactic nucleus. Because
of the normal appearance of this spectrum and the high probability
of association with the x-ray source, observations of possible
variability are urged. An observation of the faint star alongside the
galaxy does not show abnormal features.
MCG -6-30-15
F. Pineda, J. Delvaille, J. Huchra and M. Davis, Center for
Astrophysics, report the detection of x-ray emission from a 0'.8-radius
(90-percent confidence) region containing the galaxy MCG
-6-30-15. The 2-10-keV flux is ~ 3.6 x 10**-11 erg cm**-2 s**-1. The
galaxy lies within the error box quoted for 4U 1325-31 but is not
within the 2A 1326-31 error box. SAS-3 rmc data obtained in June
1976 yield the x-ray position R.A. = 13h33m00s.7, Decl. = -34o02'26" (equinox
1950.0); the position of MCG -6-30-15 is R.A. = 13h33m01s.48 +/- 0s.1,
Decl. = -34o02'30".4 +/- 1".0. Recent measurements with the digital
spectrograph on the Mt. Hopkins 155-cm reflector indicate that the
galaxy has spectral characteristics of a type 1 Seyfert, apparent
magnitude 15.5 and redshift 1800 +/- 200 km/s. The x-ray luminosity at
the redshift distance of 36 Mpc is ~ 5.3 x 10**42 erg/s.
1978 March 29 (3202) Brian G. Marsden
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