Dust and Gas Correlations in the Region of the South Celestial Pole

1979 ◽  
Vol 3 (5) ◽  
pp. 315-316
Author(s):  
D. J. King ◽  
K. N. R. Taylor
Keyword(s):  
Surface Brightness ◽  
Galactic Plane ◽  
The South ◽  
Ob Stars ◽  
Low Surface Brightness ◽  
Celestial Pole ◽  
South Celestial Pole ◽  
Spiral Arm

About 20 years ago de Vaucouleurs (1955, 1960) drew attention to faint but extensive nebulosity in the region of the South Celestial Pole. He tentatively identified it as being emission nebulosity, excited by OB stars in the overlying galactic plane. The extent of these nebulae has become even more apparent in recent years on IIIa-J plates taken for the U.K. Schmidt survey of the southern sky. From a study of survey plates covering the sky south of declination 80° a map has been prepared of the nebulosity visible in the region. A study made of this ∽nebulosity suggests that it is predominantly reflection nebulosity, with the main source of illumination being integrated starlight of the overlying Carina spiral arm. The bulk of it is of very low surface brightness (fainter than about 26 mag. per square arcsec) and appears to be in the form of a broken layer underlying the local galactic plane at an altitude of ∽ 40–80 pc. There are a number of brighter nebulous patches and filaments, frequently highly structured on a scale of minutes of arc, and extending across several degrees, usually parallel to the galactic plane.

scholarly journals HI Searches in the Zone of Avoidance: Past and Present (and Future)

1997 ◽  
Vol 14 (1) ◽  
pp. 21-24 ◽  
Author(s):  
P. A. Henning
Keyword(s):  
Feasibility Study ◽  
Surface Brightness ◽  
The South ◽  
The North ◽  
Low Surface Brightness ◽  
Complete Survey ◽  
Zone Of Avoidance ◽  
Low Surface Brightness Galaxies

AbstractIn the regions of highest optical obscuration and infrared confusion, only 21-cm emission can be used to find galaxies in the Zone of Avoidance. A feasibility study conducted with the 300-ft telescope successfully uncovered galaxies which seem to be consistent with populations of optically-selected low surface brightness galaxies. A complete survey is currently being conducted in the north with the Dwingeloo telescope. The big breakthrough should come in the south, however, with the advent of the Parkes telescope multibeam system.

scholarly journals Detailed studies of IPHAS sources - III. The highly extinguished bipolar planetary nebula IPHASX J191104.8+060845

2020 ◽  
Author(s):  
J B Rodríguez-González ◽  
L Sabin ◽  
J A Toalá ◽  
S Zavala ◽  
G Ramos-Larios ◽  
...  
Keyword(s):  
Planetary Nebula ◽  
Surface Brightness ◽  
Galactic Plane ◽  
Optical Telescope ◽  
Isaac Newton ◽  
Near Ir ◽  
Low Surface Brightness ◽  
Isaac Newton Telescope ◽  
Dark Lane ◽  
Main Cavity

Abstract We present the first detailed study of the bipolar planetary nebula (PN) IPHASX J191104.8+060845 (PN G 040.6−01.5) discovered as part of the Isaac Newton Telescope Photometric Hα Survey of the Northern Galactic plane (IPHAS). We present Nordic Optical Telescope (NOT) narrow-band images to unveil its true morphology. This PN consists of a main cavity with two newly uncovered extended low-surface brightness lobes located towards the NW and SE directions. Using near-IR WISE images we unveiled the presence of a barrel like structure, which surrounds the main cavity, which would explain the dark lane towards the equatorial regions. We also use Gran Telescopio de Canarias (GTC) spectra to study the physical properties of this PN. We emphasise the potential of old PNe detected in IPHAS to study the final stages of the evolution of the circumstellar medium around solar-like stars.

scholarly journals Nebulosity in the region of the South Celestial Pole

1979 ◽  
Vol 188 (4) ◽  
pp. 719-726 ◽  
Author(s):  
D. J. King ◽  
K. N. R. Taylor ◽  
K. P. Tritton
Keyword(s):  
The South ◽  
Celestial Pole ◽  
South Celestial Pole

scholarly journals The 6C Survey

1977 ◽  
Vol 74 ◽  
pp. 3-7
Author(s):  
J. E. Baldwin
Keyword(s):  
Surface Brightness ◽  
Low Frequency ◽  
Radio Galaxies ◽  
Aperture Synthesis ◽  
Radio Sources ◽  
Source Density ◽  
The North ◽  
Low Surface Brightness ◽  
Celestial Pole ◽  
Frequency Survey

A new survey of radio sources at 151 MHz, which has not been described previously, is in progress at Cambridge. There are several of us working on it including Warner, Kenderdine, Waggett, Masson and Mayer. The results of the first observations are at present in a preliminary state but we hope that in time they will form the first part of the 6C survey. The purpose of the survey is not to reach the faintest sources detected so far in aperture synthesis observations but to study moderately faint sources at a low observing frequency and to cover a large part of the northern sky rapidly. The deepest survey made so far at a low frequency is that of Ryle and Neville (1962) at 178 MHz over a region of 50 square degrees near the north celestial pole. The faintest sources detected had flux densities of 0.25 Jy, corresponding to a source density of 104 sr−1. It is already 15 years since that survey, which was the first trial of aperture synthesis using the earth's rotation, and much more is now technically possible. One of the most interesting features of a low frequency survey is its ability to detect preferentially sources with steep radio spectra and to be sensitive to sources of very low surface brightness. We know that in many cases these two properties go together and are associated with old radio sources, or at least with those parts of sources which are old. Many of the weak radio galaxies in nearby clusters are obvious examples of this type of source while the final, and so far unidentified, stages of the development of the most powerful double sources may be exciting candidates for discovery.

A Survey for Low Surface Brightness Galaxies around M31. II. The Newly Discovered Dwarf Andromeda VI

1999 ◽  
Vol 118 (3) ◽  
pp. 1220-1229 ◽  
Author(s):  
Taft E. Armandroff ◽  
George H. Jacoby ◽  
James E. Davies
Keyword(s):  
Surface Brightness ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

Kinematics and Neutral Hydrogen Properties of the Giant Low Surface Brightness Galaxy UGC 2936

1999 ◽  
Vol 118 (2) ◽  
pp. 765-776 ◽  
Author(s):  
T. E. Pickering ◽  
J. H. van Gorkom ◽  
C. D. Impey ◽  
A. C. Quillen
Keyword(s):  
Surface Brightness ◽  
Neutral Hydrogen ◽  
Low Surface Brightness

Discovery of a Low Surface Brightness Object near Seyfert’s Sextet

2000 ◽  
Vol 119 (4) ◽  
pp. 1691-1694 ◽  
Author(s):  
Takashi Murayama ◽  
Shingo Nishiura ◽  
Tohru Nagao ◽  
Yasunori Sato ◽  
Yoshiaki Taniguchi ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Low Surface Brightness

scholarly journals Measurements of the 3.3 μm Diffuse Galactic Emission Feature with AROME

1990 ◽  
Vol 139 ◽  
pp. 212-213
Author(s):  
M. Giard ◽  
F. Pajot ◽  
J. M. Lamarre ◽  
G. Serra
Keyword(s):  
Surface Brightness ◽  
Galactic Plane ◽  
Elevation Angle ◽  
Emission Feature ◽  
Field Of View ◽  
Interstellar Matter ◽  
Galactic Emission ◽  
Polycyclic Aromatic ◽  
Hydrocarbon Molecules ◽  
Ir Emission

AROME∗ is a balloon-borne experiment which was built to carry out measurements of IR emission features in the diffuse galactic flux. The field of view is 0.5° and surface brightness gradients are detected through azimuthal scanning at a constant elevation angle. The detection of a feature is done by comparison of the fluxes measured in narrow and wide photometric bands centered on the feature's wavelength. Two flights have been performed (August 1987, October 1988), which detected a 3.3 μm feature in the direction of the galactic plane −6° < b < 6°, 60° > l > −50°. Since this feature is characteristic of aromatic C-H bonds, we assigned it to the emission of transiently heated polycyclic aromatic hydrocarbon molecules (PAHs). With this assumption, AROME measurements show that PAHs are an ubiquitous component of the interstellar matter which contain about 10% of the available cosmic carbon.

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