Nuclear concentration of molecular gas in the late-type spiral galaxy NGC 6946 - 300 parsec scale gaseous disk

1990 ◽  
Vol 355 ◽  
pp. 436 ◽  
Author(s):  
S. Ishizuki ◽  
R. Kawabe ◽  
M. Ishiguro ◽  
S. K. Okumura ◽  
K.-I. Morita ◽  
...  
Keyword(s):  
Spiral Galaxy ◽  
Molecular Gas ◽  
Late Type ◽  
Gaseous Disk ◽  
Ngc 6946

scholarly journals CO(1-0), CO(2-1), and Neutral Gas in NGC 6946: Molecular Gas in a Late-Type, Gas-Rich, Spiral Galaxy

2007 ◽  
Vol 134 (5) ◽  
pp. 1827-1842 ◽  
Author(s):  
Lucian P. Crosthwaite ◽  
Jean L. Turner
Keyword(s):  
Spiral Galaxy ◽  
Molecular Gas ◽  
Late Type ◽  
Neutral Gas ◽  
Ngc 6946

scholarly journals Spectroscopy of H II regions in the late-type spiral galaxy NGC 6946

2013 ◽  
Vol 68 (1) ◽  
pp. 40-52 ◽  
Author(s):  
A. S. Gusev ◽  
F. H. Sakhibov ◽  
S. N. Dodonov
Keyword(s):  
Spiral Galaxy ◽  
H Ii Regions ◽  
Late Type ◽  
Ngc 6946

scholarly journals Large Scale Dissociation of Molecular Gas and Star Formation in M83

1987 ◽  
Vol 115 ◽  
pp. 628-628
Author(s):  
R. J. Allen ◽  
P. D. Atherton ◽  
R.P.J. Tilanus
Keyword(s):  
Star Formation ◽  
Large Scale ◽  
Angular Resolution ◽  
Molecular Gas ◽  
Late Type ◽  
Ngc 6946 ◽  
Central Regions ◽  
Spiral Arm ◽  
Co Observations

Observations of the distribution of the CO-molecule in several prominent late-type galaxies indicate that the central HI depressions may very well be filled in with molecular gas. One such galaxy is M83 (NGC 5236) and, although the angular resolution of the CO-observations is insufficient to discern details on the scale of a spiral arm, it is known that CO is concentrated in the central regions within a radius of 1′. Furthermore, at a resolution of 50″, the CO profile at the position of the nucleus is as bright in M83 as it is for example in NGC 6946, IC 346 and M51.

scholarly journals Building up mass in the centers of late type galaxies

2007 ◽  
Vol 3 (S245) ◽  
pp. 169-172
Author(s):  
E. Schinnerer ◽  
T. Böker ◽  
E. Emsellem ◽  
U. Lisenfeld ◽  
D. Downes
Keyword(s):  
Star Formation ◽  
Gas Flow ◽  
Line Emission ◽  
Hii Regions ◽  
Small Scale ◽  
Molecular Gas ◽  
Late Type ◽  
Central Mass ◽  
Ngc 6946 ◽  
First Time

AbstractWe present highest angular resolution (~ 1″ and 0.35″) mm-interferometric observations of the HCN(1-0), 12CO(1-0) and 12CO(2-1) line emission in the central 300 pc of the late-type spiral galaxy NGC 6946. The data, obtained with the IRAM Plateau de Bure Interferometer (PdBI) shows for the first time a molecular gas spiral in the inner ~ 10″ (270 pc) with a large concentration of molecular gas ($M_{H_2} \sim\,1.6\times10^7\,M_{\odot}$) within the inner 60 pc, The gas distribution in the central 50 pc has been resolved and is consistent with a gas ring or spiral driven by a bar. Both the distribution of the molecular gas as well as its kinematics can be well explained by the influence of an inner stellar bar of about 400 pc length as tested via a qualitative model for the gas flow. NGC 6946 is a prime example of molecular gas kinematics being driven by a small-scale, secondary stellar bar.For the first time, it is possible to directly compare the location of (dense) giant molecular clouds with that of (optically) visible HII regions in space-based images. We use the 3 mm continuum and the HCN emission to estimate in the central 50 pc the star formation rates in young clusters that are still embedded in their parent clouds and hence are missed in optical and near-IR surveys of star formation. The amount of embedded star formation is about 1.6 times as high as that measured from HII regions alone, and appears roughly evenly split between ongoing dust-obscured star formation and very young giant molecular cloud cores that are just beginning to form stars. The build-up of central mass seems to have continued over the past ≥ 10 Myrs, to have occurred in an extended (albeit small) volume around the nucleus, and to be closely related to the presence of an inner bar.

scholarly journals Molecular gas properties of the giant molecular cloud complexes in the arms and inter-arms of the spiral galaxy NGC 6946

2013 ◽  
Vol 437 (2) ◽  
pp. 1434-1455 ◽  
Author(s):  
Selçuk Topal ◽  
Estelle Bayet ◽  
Martin Bureau ◽  
Timothy A. Davis ◽  
Wilfred Walsh
Keyword(s):  
Spiral Galaxy ◽  
Molecular Cloud ◽  
Molecular Gas ◽  
Giant Molecular Cloud ◽  
Ngc 6946 ◽  
Gas Properties

scholarly journals SOFIA/FIFI-LS Full-disk [C ii] Mapping and CO-dark Molecular Gas across the Nearby Spiral Galaxy NGC 6946

2020 ◽  
Vol 903 (1) ◽  
pp. 30
Author(s):  
F. Bigiel ◽  
I. de Looze ◽  
A. Krabbe ◽  
D. Cormier ◽  
A. T. Barnes ◽  
...  
Keyword(s):  
Spiral Galaxy ◽  
Molecular Gas ◽  
Ngc 6946 ◽  
Full Disk

scholarly journals 5.18. Molecular gas in the poststarburst galaxy NGC7331

1998 ◽  
Vol 184 ◽  
pp. 247-248
Author(s):  
T. Tosaki ◽  
Y. Shioya
Keyword(s):  
High Resolution ◽  
Spiral Galaxy ◽  
Stellar Populations ◽  
Optical Spectra ◽  
Molecular Gas ◽  
Early Type ◽  
Origin And Evolution ◽  
Co Observations

To understand the origin and evolution of starburst activity, we must study the full evolution of starburst; i.e., pre-, on-going, and post-starburst phases. It seems reasonable to suppose the numerous A-type stars indicate past starburst and they show strong Balmer absorption. NGC7331, nearby early-type spiral galaxy, is one of the poststarburst galaxies which show strong Balmer absorption. The optical spectra of NGC7331 were dominated by component of intermediate-age (5 × 109 years) stellar populations (Ohyama & Taniguchi 1996). We present the result of the high resolution CO observations of NGC7331 using Nobeyama Milimeter Array.

scholarly journals Studying the contribution of components and type of spiral galaxy NGC 6946 using digital image processing

2019 ◽  
Vol 13 (28) ◽  
pp. 27-32
Author(s):  
A. K. Ahmed
Keyword(s):  
Spiral Galaxy ◽  
Rough Sets ◽  
Essential Element ◽  
National Research Institute ◽  
Astronomical Image ◽  
Ngc 6946 ◽  
Time Required ◽  
Variable Precision Rough Sets ◽  
Source Of Information ◽  
Classified Image

NGC 6946 have been observed with BVRI filters, on October 15-18,2012, with the Newtonian focus of the 1.88m telescope, Kottamiaobservatory, of the National Research Institute of Astronomy andGeophysics, Egypt (NRIAG), then we combine the BVRI filters toobtain an astronomical image to the spiral galaxy NGC 6946 whichis regarded main source of information to discover the components ofthis galaxy, where galaxies are considered the essential element ofthe universe. To know the components of NGC 6946, we studied itwith the Variable Precision Rough Sets technique to determine thecontribution of the Bulge, disk, and arms of NGC 6946 according todifferent color in the image. From image we can determined thecontribution for each component and its percentage, then what is thepercentage mean. In this technique a good classified image resultand faster time required to done the classification process.

scholarly journals An exceptional population of late-type WC stars in the metal-rich spiral galaxy M 83

2004 ◽  
Vol 419 (2) ◽  
pp. L17-L20 ◽  
Author(s):  
P. A. Crowther ◽  
L. J. Hadfield ◽  
H. Schild ◽  
W. Schmutz
Keyword(s):  
Spiral Galaxy ◽  
Late Type
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