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1980AJ....85...363Landau+

Variable radio sources: 90-GHz flux densities

Landau R., Epstein E.E., Rather J.D.G.

Abstract

Fifty-five variable radio sources have been observed at 90 GHz, 22 of them for first time. The sources typically have flat spectra between 5 and 90 GHz. The dispersion of the spectral indices of the BL Lacertids is narrower than the dispersion for other objects. The variability of those sources previously observed is somewhat greater than observed by Owen et al. (1978); some sources exhibited the lowest flux densities ever recorded at 90 GHz. An upper limit of 0.14 Jy was measured for SS433 in July 1979.

Observations

Observations were made with the NRAO 11-m telescope at Kitt Peak. The adopted 90-GHz flux density of DR21 is 17.7 Jy and is based on a 90-GHz brightness temperature of 183.4+-3.4 K for Jupiter (Ulich 1978).

References


a Kellermann & Pauliny-Toth (1971)
b Fogarty+ (1971)
c Conklin+ (1972)
d Hobbs & Dent (1977)
e Owen & Dent (1977)
f Elias+ (1978)
g Owen+ (1978)
h Schnopper+ (1978)
i Purschell+ (1979) 

Table 1. 90-GHz flux density measurements
				       |-----  Previous measurements  ----------------|
(1)        (2)       (3)       (4)       (5)   Previous measurements  (6)
name      Synonym   S_90+-mJy S_90+-mJy  S_90+-mJy               S_90 err
		    S_min 7/79      12/78      S_max  Date Ref          S_max
Date Ref
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9
0007+10  III Zw 2   1.6 0.1   2.6 0.4    6.9 0.7     (01/78 h)    2.7 0.4      (12/75 h)
0048-09             0.8 0.1   1.2 0.3    0.7 0.2     (12/69 a)
0133+47  DA55       2.1 0.2   2.1 0.3    2.3 0.3     (01/77 g)    2.7 0.8      (12/7