Showing papers by "G. Neugebauer published in 1971"
TL;DR: In this paper, the reduced data of the Mariner 6 and 7 Infrared Radiometer Experiments are presented, along with a discussion of the reduction and calibration procedures, and evidence is presented showing that the surface of Mars is strongly nonhomogeneous in its thermal properties, on scales ranging from those of the classical light and dark areas to the limit of resolution of the radiometers.
Abstract: The reduced data of the Mariner 6 and 7 Infrared Radiometer Experiments are presented, along with a discussion of the reduction and calibration procedures. Evidence is presented showing that the surface of Mars is strongly nonhomogeneous in its thermal properties, on scales ranging from those of the classical light and dark areas to the limit of resolution of the radiometers. On the sunlit side, the mean thermal inertia, for admissible bolometric albedos, is 0.006 (cal cm^(-2) sec^(-1/2) °K^(-1)). The dark areas Syrtis Major and Mare Tyrrhenum, observed at night, require thermal inertias as high as 0.010. The temperatures measured over the circular basin Hellas require a bolometric albedo of 0.40 and also a high thermal inertia. The temperature measured over the south polar cap, 148° K, provides evidence that the major constituent of the frost deposit is CO_2.
161 citations
TL;DR: IR radiation sources, discussing intermediate and early stars, galactic nucleus and extragalactic sources as mentioned in this paper, were discussed in detail in this paper. But the authors did not discuss the galactic nucleus.
Abstract: IR radiation sources, discussing intermediate and early stars, galactic nucleus and extragalactic sources
31 citations
TL;DR: An extensive collection of observational data is presented which indicates that the recently discovered infrared object Maffei 1 is a highly reddened giant elliptical galaxy at a distance of about 1 Mpc, and thus is probably a new massive member of the Local Group as discussed by the authors.
Abstract: An extensive collection of observational data is presented which indicates that the recently discovered infrared object Maffei 1 is a highly reddened giant elliptical galaxy at a distance of about 1 Mpc, and thus is probably a new massive member of the Local Group.
23 citations
21 citations
Journal Article•
18 citations
TL;DR: In this paper, the infrared radiation from the nucleus of NGC 5128 has been measured from 1 to 10 microns and interpreted to indicate a small non-stellar infrared core superposed on an extended, reddened stellar component.
Abstract: Infrared radiation from the nucleus of NGC 5128 has been measured from 1 to 10 microns. Scans and aperture-size data show that there is only one bright infrared region within the central 1 min of the galaxy and that it is coincident to within 5 sec with the ?hot spot' of Kunkel and Bradt. The 3.5- and 2.2-micron radiation is more peaked toward the center than are the shorter wavelengths. The data are interpreted to indicate a small nonstellar infrared core superposed on an extended, reddened stellar component.
15 citations
7 citations
01 Jan 1971
TL;DR: The energy radiated by Mars in the wavelength bands 8-12 and 18-25 μ has been measured during the flyby of Mariner 1969 with linear resolution of 50 km at closest approach as mentioned in this paper.
Abstract: The energy radiated by Mars in the wavelength bands 8–12 and 18–25 μ has been measured during the flyby of Mariner 1969 with linear resolution of 50 km at closest approach. From the laboratory energy calibrations and assuming unit emissivity, the temperature of the surface materials has been derived. The main results are summarized as follows:
(a)
The temperatures near the equator (Mariner 6), as function of local time, on the average agree with the values expected on the basis of the gross thermophysical properties of the soil determined from ground-based measurements.
(b)
The temperature fluctuations around their mean seem to correspond to variations in albedo over the classical features of the planet, with the possible exception of one area.
(c)
The lowest temperatures measured by channel 2 of Mariner 7, during the polar swath, were 148 K, while at the edge of the polar cap the temperature was 230 K.