Intensity Variations of DW 1548+05 at 2.7, 6.6 and 10.6 GHz
Abstract
The 'flat-spectrum' radio source DW 1548 + 05 is shown to have varied significantly in intensity at 2.7 GHz, despite the lack of convincing evidence for variability at higher frequencies. The interpretation of such sources as inhomogeneous objects in which different regions become optically thick at different frequencies is not compromised by the apparent lack of high-frequency variability. The advantages of observing at frequencies below 5 GHz should not be overlooked when implementing monitoring programs intended to place constraints on source models.
- Publication:
-
Astrophysical Letters
- Pub Date:
- 1977
- Bibcode:
- 1977ApL....18..109B
- Keywords:
-
- Astronomical Models;
- Microwave Emission;
- Microwave Spectra;
- Radiant Flux Density;
- Radio Sources (Astronomy);
- Astronomical Spectroscopy;
- Optical Thickness;
- Radio Astronomy;
- Radio Spectroscopy;
- Superhigh Frequencies;
- Ultrahigh Frequencies;
- Astronomy