Several Star-Formation Regions in the Southern Hemisphere

Astrophysics ◽  
2021 ◽  
Author(s):  
A. L. Gyulbudaghian
Keyword(s):  
Star Formation ◽  
Southern Hemisphere ◽  
Star Formation Regions

scholarly journals Narrow-band $\rm{H}{\beta}$ images of star-formation regions in HII galaxies

2007 ◽  
Vol 476 (1) ◽  
pp. 89-96 ◽  
Author(s):  
P. Lagos ◽  
E. Telles ◽  
J. Melnick
Keyword(s):  
Star Formation ◽  
Narrow Band ◽  
Star Formation Regions

scholarly journals VELOCITY SEGREGATION IN A CLUMP-LIKE OUTFLOW WITH A NON-TOP HAT VELOCITY CROSS-SECTION

2021 ◽  
Vol 57 (2) ◽  
pp. 269-277
Author(s):  
A. Castellanos-Ramírez ◽  
A. C. Raga ◽  
J. Cantó ◽  
A. Rodríguez-González ◽  
L. Hernández-Martínez
Keyword(s):  
Star Formation ◽  
Simple Model ◽  
Radial Velocity ◽  
Cross Section ◽  
High Velocity ◽  
Planetary Nebulae ◽  
Young Stars ◽  
Working Surface ◽  
Star Formation Regions ◽  
Analytic Models

High velocity clumps joined to the outflow source by emission with a “Hubble law” ramp of linearly increasing radial velocity vs. distance are observed in some planetary nebulae and in some outflows in star formation regions. We propose a simple model in which a “clump” is ejected from a source over a period τ0, with a strong axis to edge velocity stratification. This non-top hat cross section results in the production of a highly curved working surface (initially being pushed by the ejected material, and later coasting along due to its inertia). From both analytic models and numerical simulations we find that this working surface has a linear velocity vs. position ramp, and therefore reproduces in a qualitative way the “Hubble law clumps” in planetary nebulae and outflows from young stars.

Optical Polarisation Studies of Star Formation Regions

1987 ◽  
pp. 161-165
Author(s):  
S. M. Scarrott ◽  
T. M. Gledhill ◽  
R. F. Warren-Smith
Keyword(s):  
Star Formation ◽  
Star Formation Regions ◽  
Optical Polarisation

scholarly journals Detection of new sources of 4765-MHz OH masing

2002 ◽  
Vol 206 ◽  
pp. 112-115
Author(s):  
Richard G. Dodson ◽  
Simon P. Ellingsen
Keyword(s):  
Star Formation ◽  
High Resolution ◽  
Ground State ◽  
Theoretical Models ◽  
Maser Emission ◽  
Circular Polarisation ◽  
Peak Flux ◽  
Star Formation Regions ◽  
Compact Array

We have used the Australia Telescope Compact Array (ATCA) to make a sensitive search for maser emission from the 4765-MHz transition of OH towards a sample of 55 star formation regions. Maser emission with peak flux densities in excess of 100 mJy were detected in 14 sites, with 10 of these being new discoveries. Unlike the ground-state OH transitions the 4765-MHz transition is not predicted to be circularly polarised and none of the masers observed have detectable levels of linear, or circular polarisation. Combining our results with those of previous high resolution observations of other OH transitions we are able to investigate various theoretical models for the pumping of OH masers.

Gas and Dust in CrA

1981 ◽  
Vol 4 (2) ◽  
pp. 247-250 ◽  
Author(s):  
K. N. R. Taylor ◽  
R. Llewellyn ◽  
P. Payne ◽  
R. A. Vaile ◽  
S. Sakellis
Keyword(s):  
Star Formation ◽  
Southern Hemisphere ◽  
Galactic Plane

Coronae Austrinae is one of the few star formation areas lying well away from the galactic plane (l = 360°, b = −17°) and is visible predominantly from the Southern Hemisphere.

scholarly journals Cygnus OB2 at all wavelengths

2003 ◽  
Vol 212 ◽  
pp. 505-514 ◽  
Author(s):  
Jürgen Knödlseder
Keyword(s):  
Star Formation ◽  
Gamma Ray ◽  
Current Knowledge ◽  
Radio Continuum ◽  
Electromagnetic Spectrum ◽  
Text Book ◽  
Nearby Star ◽  
X Ray ◽  
Stellar Cluster ◽  
Star Formation Regions

The Cygnus X region is one of the most nearby star formation regions within our Galaxy, that is recognised by prominent emission throughout the entire electromagnetic spectrum, from radio to gamma-ray waves. The centre is populated by the peculiar stellar cluster Cyg OB2, traditionally classified as OB association, but in the light of modern data more likely the prototype of a young globular cluster within our own Galaxy. Heavily shredded by dense molecular clouds this object has been less thoroughly studied than other, more distant star formation complexes in the Milky Way. I will review our current knowledge about this object, by exposing its properties and that of its environment throughout the entire electromagnetic spectrum. Particular emphasis will be given to infrared, radio-continuum, X-ray, and gamma-ray line observations that find in Cyg OB2 a text-book case for multiwavelength studies.

scholarly journals High Resolution Radio Continuum Observations of High Mass Star Formation Regions

2001 ◽  
Vol 205 ◽  
pp. 280-281
Author(s):  
S. Kurtz ◽  
P. Hofner ◽  
C. Vargas ◽  
W. Díaz-Merced
Keyword(s):  
Star Formation ◽  
Radio Continuum ◽  
High Mass ◽  
High Angular Resolution ◽  
Mass Star ◽  
High Quality ◽  
Very Large Array ◽  
Adverse Conditions ◽  
Star Formation Regions ◽  
Calibration Techniques

We present high angular resolution centimeter and millimeter continuum observations of several galactic massive star formation regions. Using calibration techniques pioneered at the Very Large Array, we are able to obtain high quality images even under adverse conditions of phase stability. Techniques such as these will be essential if future millimeter arrays are to obtain high quality and high precision images. We provide a current summary of our on-going survey, and present images and a brief discussion of several of the more intriguing sources.

Panoramic Spectroscopy of Galaxies with Star Formation Regions. A Study of SBS0750+603B

Astrophysics ◽  
2020 ◽  
Vol 63 (1) ◽  
pp. 45-55
Author(s):  
S. A. Hakopian ◽  
S. N. Dodonov ◽  
A. V. Moiseev ◽  
A. A. Smirnova
Keyword(s):  
Star Formation ◽  
Star Formation Regions
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