Central Bureau for Astronomical Telegrams
IAUC 4357: X-RAY N 1354-64; QSO 1510-089; OH MEGAMASER IN IRAS 1525+3609
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Circular No. 4357
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
X-RAY NOVA 1354-64
H. Pedersen, European Southern Observatory; S. Ilovaisky,
Observatoire de Haute-Provence; and M. van der Klis, EXOSAT
Observatory, telex: "We have identified the optical counterpart of the
Ginga x-ray nova (cf. IAUC 4342). The object is seen on a 60-min
blue plate obtained by G. Pizarro on Mar. 28.3 UT using the ESO 1-m
Schmidt telescope, while it is not visible on the corresponding ESO
Quick Blue Survey plate. Its position derived from the pointing
coordinates at the 1.54-m Danish telescope at La Silla is R.A. =
13h54m28s, Decl. = -64 29'24" (equinox 1950.0, uncertainty 10"), within
the Ginga error circle. CCD photometry obtained with the same
telescope on Mar. 29.2 indicated V = 16.9. Measurements on the
following three nights show variations of > 0.1 mag in 8 hr. An
optical spectrum taken with the ESO 3.6-m telescope by J. Bergeron,
Institut d'Astrophysique, Paris, shows He II 468.6-nm emission."
QSO 1510-089
C. J. Salter and H. Steppe, Instituto de Radioastronomia
Milimetrica, report: "A strong outburst has occurred in the millimeter-
wave continuum emission from the optically-highly-polarized quasar
1510-089. We have measured the following flux densities at 90 GHz
with the IRAM 30-m telescope at Pico Veleta, Spain: 1985 June 2,
1.35 +/- 0.3 Jy; 1986 June 6, 2.6 +/- 0.1 Jy; 1987 Mar. 4, 4.0 +/- 0.3
Jy; Mar. 31, 6.2 +/- 0.4 Jy. On Mar. 31, the 226-GHz flux density
was 6.3 +/- 0.7 Jy, indicating a flat millimeter-wave spectrum."
OH MEGAMASER IN IRAS 1525+3609
L. Bottinelli, L. Gouguenheim, A. M. le Squeren, and J. M.
Martin, Observatoire de Paris, Meudon; M. Dennefeld, Institut
d'Astrophysique, Paris; and G. Paturel, Observatoire de Lyon, telex:
"The most distant OH megamaser (distance = 219 Mpc, assuming H = 75
km/s/Mpc) was discovered in the IRAS source 1525+3609 with the Nancay
radio telescope. The source has an infrared luminosity of 1.6 x 10E11
solar luminosities (L_o). The isotropic luminosity at 1667 MHz is
370 L_o and the L(1667 MHz)/L(1665 MHz) ratio has an unusually low value
of about 0.8. This is the first case in OH megamasers where L(1667 MHz)
is not predominant. Two emission peaks, separated by about 60 km/s,
are observed both at 1667 and 1665 MHz; these peaks have a 1667
MHz/1665 MHz line-ratio of about 1. No H I feature has been detected."
1987 April 2 (4357) Daniel W. E. Green
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