Central Bureau for Astronomical Telegrams
IAUC 5027: 1990K; 1989c1; HCN EMISSION FROM Mkn 231
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Read IAUC 5028
Circular No. 5027
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1990K IN NGC 150
M. M. Phillips, Cerro Tololo Interamerican Observatory,
telexes: "A spectrum of SN 1990K obtained on May 31 UT by R. E.
Williams with the CTIO 4-m telescope shows that this object is a
type-II supernova. The spectrum closely resembles that of SN 1987A
approximately 15-20 days after outburst, with strong H-alpha P-Cyg
emission and weaker lines due to H-beta, Fe II, Na I, and Ca II.
Notably weak is the Ba II 614.2-nm line, which was a strong
absorption feature in the spectrum of SN 1987A at this stage."
COMET AUSTIN (1989c1)
D. Despois, Observatoire de Bordeaux; D. Bockelee-Morvan,
Observatoire de Paris, Meudon; G. Paubert, Institut de Radio Astronomie
Millimetrique (IRAM); P. Colom, Centro Astronomico de Yebes;
and J. Crovisier, Observatoire de Paris, Meudon, report: "We have
detected methanol (CH3OH) in comet Austin on May 25 with the IRAM
30-m telescope. The groups of J(2-1) transitions at 96 GHz and
J(3-2) at 145 GHz were searched for. The 3(0)-2(0) A+ and 3(1)-2(1)
E lines were observed with areas of 0.23 +/- 0.05 and 0.11 +/- 0.04
K km sE-1, respectively. Several other lines may be present at the
2-sigma level."
HCN EMISSION FROM MARKARIAN 231
P. Solomon and J. Barrett, State University of New York, Stony
Brook; S. Radford and D. Downes, Institut de Radio Astronomie
Millimetrique (IRAM), Grenoble; and L. Sage, Max-Planck-Institut fur
Radioastronomie, Bonn, communicate: "We report the observation with the
IRAM 30-m telescope of emission from the HCN J(1-0) transition at a
rest frequency of 89 GHz from the Seyfert I galaxy Markarian 231.
The millimeter-wave emission line has a velocity cz = 12 640 +/- 10
km/s, an integrated intensity of 2.6 K km sE-1, and a FWHM linewidth
of 205 km/s. Markarian 231, the most luminous galaxy in the local
universe, has a far-infrared luminosity of 3 x 10E12 solar luminosities.
HCN emission traces very dense molecular gas with a molecular
hydrogen (H2) density of at least 10E4 cmE-3. The HCN luminosity of
Markarian 231 exceeds the CO luminosity of ordinary large spiral
galaxies like the Milky Way. We estimate that Markarian 231 contains
approximately 10E10 solar masses of dense molecular gas."
1990 May 31 (5027) Daniel W. E. Green
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