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 The Lick Observatory Two Micron Camera

1995 ◽  
Vol 167 ◽  
pp. 79-80 ◽  
Author(s):  
K. Gilmore ◽  
D. Rank ◽  
P. Temi
Keyword(s):  
Star Formation ◽  
Focal Plane ◽  
Near Infrared ◽  
Narrow Band ◽  
Infrared Camera ◽  
Astronomical Imaging ◽  
New Instrument ◽  
Star Formation Regions ◽  
Infrared Sources

Lick Observatory has recently developed a near infrared camera for astronomical imaging. The new camera has been built around a Rockwell NICMOSII 256 × 256 HgCdTe focal plane array. The dewar and optics were manufactured by Infrared Laboratories in Tucson, Arizona while the electronics and data system were designed and fabricated at Lick Observatory.The new instrument was designed to image faint galaxies and other astronomical objects as well as embedded infrared sources in star formation regions. The camera has cold focal plane scales of 0.2, 0.4 and 0.6 arcseconds per pixel when used at the telescope. Standard H, J and K as well as narrow band special purpose filters are contained in two independent motorized filter wheels.The camera performance with different plate scales and filters as well as the mechanical, optical and electrical lay-out will be shown. M 42 will be used for characterization of the camera's performance.

scholarly journals Star-formation in NGC 4038/4039 from broad and narrow band photometry: cluster destruction?

2005 ◽  
Vol 443 (1) ◽  
pp. 41-60 ◽  
Author(s):  
S. Mengel ◽  
M. D. Lehnert ◽  
N. Thatte ◽  
R. Genzel
Keyword(s):  
Star Formation ◽  
Narrow Band

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.

scholarly journals The First Detection of Wolf-Rayet Stars in M31

1982 ◽  
Vol 99 ◽  
pp. 531-537
Author(s):  
Michael M. Shara ◽  
Anthony F. J. Moffat
Keyword(s):  
Star Formation ◽  
Narrow Band ◽  
Massive Stars ◽  
Weak Line ◽  
Band Filter ◽  
Narrow Band Filter ◽  
Rayet Star

A search to continuum magnitude B ∼ 21.5 (MB∼ −3) using a narrow band filter at λ4670å and a wide B-band filter has revealed 21 Wolf-Rayet star candidates in about half the giant Sb galaxy M31. Some weak-line WR stars, particularly WN subtypes, may have escaped detection. These numbers are compatible with the total number of luminous (i.e. massive) stars in M31. Eighteen of twenty confirmed candidate stars in M31 lie in the direction of 0B associations in the ring of prominent star formation 5–16 kpc from the center.

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.

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