On stability of galactic disks in the modified dynamics and the distribution of their mean surface brightness

1989 ◽  
Vol 338 ◽  
pp. 121 ◽  
Author(s):  
Mordehai Milgrom
Keyword(s):  
Surface Brightness ◽  
Galactic Disks ◽  
Modified Dynamics

scholarly journals 5.11. Dense molecular gas in nearby galaxies

1998 ◽  
Vol 184 ◽  
pp. 231-233 ◽  
Author(s):  
Y. Gao ◽  
P.M. Solomon
Keyword(s):  
Dipole Moment ◽  
Surface Brightness ◽  
Galactic Nuclei ◽  
Molecular Gas ◽  
Galactic Disks ◽  
Central Regions ◽  
Nearby Galaxies ◽  
Gas Properties

HCN, one of the most abundant high dipole-moment molecules (traces molecular gas at densities ≳ 3 × 104 cm−3 whereas CO traces at ∼ 500 cm−3), has only been detected in ∼ 25 galaxies, primarily towards the galactic nuclei (Solomon et al. 1992; Nguyen-Q-Rieu et al. 1992; Helfer & Blitz 1993; Aalto et al. 1995). Dense molecular gas properties in “normal” galactic disks, as compared to the centers of “normal” spirals, starbursts, and luminous IR galaxies are not clear. As part of a large HCN survey in 60 galaxies (Gao 1996; Gao & Solomon 1997), we present here HCN observations in central regions of a few nearby galaxies. HCN was mapped at least along the major axes in the inner disks to determine the total HCN luminosity, the distribution with radius of HCN emission, and of the surface brightness ratio of SBR ≡ IHCN/ICO.

Variation of the amount of hydrogen along the galactic ridge

1967 ◽  
Vol 31 ◽  
pp. 171-172
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Surface Brightness ◽  
Milky Way ◽  
Neutral Hydrogen ◽  
Line Of Sight ◽  
Optical Surface ◽  
Hydrogen Density ◽  
Continuous Radiation ◽  
Galactic Longitude

The integralNHof neutral-hydrogen density along the line of sight is determined from the Kootwijk and Sydney surveys. The run ofNHwith galactic longitude agrees well with that of thermal continuous radiation and that of the optical surface brightness of the Milky Way.

Surface Brightness Scale of Galactic Cepheids

1999 ◽  
Vol 190 ◽  
pp. 561-562
Author(s):  
G. P. Di Benedetto
Keyword(s):  
Surface Brightness ◽  
Variable Stars ◽  
Giant Stars ◽  
Near Ir

An accurate calibration of the surface brightness scaleSVas a function of the near-IR color (V–K) has been recently measured for non-variable Galactic dwarf and giant stars. It can be shown that this correlation can be applied to theSVscale of Galactic Cepheid variable stars, which are of major cosmological interest.

[CII] synthetic emission maps of simulated galactic disks

2015 ◽  
Vol 75-76 ◽  
pp. 385-386
Author(s):  
A. Franeck ◽  
S. Walch ◽  
S.C.O. Glover ◽  
D. Seifried ◽  
P. Girichidis ◽  
...  
Keyword(s):  
Galactic Disks

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
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