NGC 5128 Research Articles

Observations at 9.1 CM of Taurus a, the Orion Nebula, Virgo a, Centaurus a, Sagittarius a, and the Omega Nebula, with a 2'.3 Fan Beam.

view Abstract Citations (18) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations at 9.1 CM of Taurus a, the Orion Nebula, Virgo a, Centaurus a, Sagittarius a, and the Omega Nebula, with a 2'.3 Fan Beam. Little, A. G. Abstract Fan-beam observations of several of the stronger radio sources have been made, using a wide-band parametric amplifier connected to the Stanford microwave spectroheliograph. All sources have been scanned in the east-west direction at meridian transit. For the two sources Taurus A and Virgo A the north-south antenna was used to provide two additional scanning directions. From these, the Taurus A source is found to be an ellipse 4.3 by 2 7, with the position angle of its major axis at 1490, while the Virgo A radiation comes from a narrow region 1 8 by less than 1' lying between 760 and 820 away from the position angle of the jet. The central source of Centaurus A is found to be split into two regions separated by 4 7 in the east- west direction, while the Orion Nebula and Sagittarius A are simple sources, 3.5 and 4 5 wide, respectively. The Omega Nebula is shown to have a weak source located at the optical center of the nebula and a strong source 4'.8 to the west. The observed transit times of the maxima are also given. Publication: The Astrophysical Journal Pub Date: January 1963 DOI: 10.1086/147493 Bibcode: 1963ApJ...137..164L full text sources ADS | data products NED (5)

THE RADIAL VELOCITY OF NGC 6940

THE RADIAL VELOCITY OF NGC 6940

Letter to the Editor: does NGC 2264 Contain Contracting F and G Stars?

Letter to the Editor: does NGC 2264 Contain Contracting F and G Stars?

S- AND C-TYPE STARS IN NGC 7789

S- AND C-TYPE STARS IN NGC 7789

POLARIZATION IN NGC2244

POLARIZATION IN NGC2244

Magnitudes and Colors in NGC 752.

Magnitudes and Colors in NGC 752.

Measures of the cluster NGC 6633

Measures of the cluster NGC 6633

An investigation of the cluster M 37 (NGC 2099) for proper-motion.

An investigation of the cluster M 37 (NGC 2099) for proper-motion.

Our Astronomical Column

THE U.S. NAVAL OBSERVATORY, WASHINGTON.—Under the title “Instruments and Publications of the United States Naval Observatory,” the superintendent has circulated a series of photographs of the instruments at present in use in that noble astronomical institution. They are taken by the heliotype process, and comprise (1) the mural circle, mounted in 1844, aperture 4.1 inch; the transit instrument, 5.33 inch aperture, mounted in the same year, and placed in the same room beside the mural circle; the smaller equatorial, mounted in 1844, with which so much good work has been performed, aperture 9.62 inch; the transit-circle, by Pistor and Martins, Berlin, which was mounted in 1860, the aperture of the object-glass 8.52 inch, and the focal length 12 feet 1 inch; a general view of the grand 26-inch refractor, of 32 feet 5.8 inch focal length, mounted in 1873, and one of the most powerful telescopes in the world; the clock-work, &c., of this magnificent instrument is shown on a separate plate. Brief descriptions accompany these heliotypes, and in addition are drawings made with the 26-inch equatorial of the nebula in Orion, the omega nebula, the annular nebula in Lyra, and the planet Saturn. Some account of the foundation of the observatory and a list of its publications from 1845–76 precede the brief description of the instruments of which views are presented.