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We compare atomic gas, molecular gas, and the recent star formation rate (SFR) inferred from HЮБ in the Small Magellanic Cloud (SMC). ... This allows us to disentangle conversion factor effects from the impact of metallicity on the formation and star formation efficiency of molecular gas. ... At a fixed total gas surface density the SMC has a 5-10 times lower molecular gas fraction (and star formation rate) than large spiral galaxies. ...

... A universal physical relation for quasars . ... Harvey Tananbaum and his collaborators have first observed a relation between the soft X-ray and the optical/ultraviolet emission in AGN in 1979. Such relation is nonlinear, and it is usually parameterized as dependence between the logarithm of the monochromatic luminosities at 2500 †Е ( L 2500†Е ) and 2 keV ( L 2keV ) . ... Yet, the dispersion along the L 2500†Е тАУ L 2keV relationship is found to be rather high, typically ~0.35тАУ0.4 in log units. ...

... Most of the spirals discussed in the following are well-known starburst galaxies (M 82, NGC 253, etc.) In addition to their nuclear activity, which makes them so popular, the selected galaxies have several other phenomena in common, such as bars, gas outflow, and possibly nuclear rings. ... I will show that the gas dynamics in the outer and inner parts of these galaxies are strongly related to their starburst activity. ... NGC 253 . ... The peculiar galaxy NGC 4258: A black hole candidate. ...

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Mars . ... Previously understood that magnetic fields were directly related to rotation, so when I read that Mars, like Venus, didn't have one, my understanding crumbled. What exactly causes magnetic fields in planets? ... RELATED TOPICS: MAGNETIC FIELD . Planetary magnetic fields are definitely related to rotation, but directly not so much. ... Get instant access to subscriber content on Astronomy.com! ...

A comparative study of type I and type II supernovae . ... Sternberg State Astronomical Institute, Moscow, U.S.S.R. (Received 26 November, 1985) . ... No significant difference between SNe I and SNe II has been found in their radial distribution and frequency of outbursts in spiral galaxies. ... The radial distribution of type Ia SNe in spiral galaxies is only slightly steeper than the one for SNe II, while SNe Ib/c are more concentrated towards the central regions. ...

... Scaling relations of galaxies: . ... 2007) . ... This research is now being extended to other clusters such as Hydra and Centaurus, by Ingo Misgeld . ... 2007 , Misgeld et al. 2008 and 2009 ) support a picture where the scaling relations of dwarf galaxies are shaped more by internal than external agents, given that colour-magnitude and magnitude-surface brightness relations agree quite well between the low-density Local Group environment and dense clusters like Fornax and Hydra. Misgeld et al. ...

Do LIRGs follow the Tully-Fisher relation? ... For a small we can say majority of investigate i Conclusion number of galaxies in our sample, that the T-F relation holds. ... The purpose of this research was to study the LIRGs (Luminous Infrared Galaxies) and see if they follow the Tully-Fisher relation. The LIRGs are different to normal galaxies in the fact that they emit 90% of their light in infrared. ... The faster the galaxy rotates, the wider is the emission line in velocity. ...

... Mindful of these biases, I can now explore the relations between the measured rotation periods and various other observables. The hypothesis behind monitoring stellar variability is that active stars have asymmetric spot distributions on their photospheres. ... They found that only stars with rotation periods greater than seven days show variations greater than 0.4 magnitudes at I. Bouvier et al . ... 1993a) demonstrated a relation between X--ray flux and spectral type in ZAMS stars. ...

PEGASE: Project de'Etude des Galaxies par Synthese Evolutive (by Damien Le Borgne and Brigitte Rocca-Volmerange) . Galaxy colours (by Robin Stevens) . ... Images of radio galaxies and quasars mapped at VLA . Atlas of radio galaxies in 3CRR sample (images, description, classification, etc.) Radio Galaxy and Quasar Images at Other Sites by A.Bridle . ... Radio galaxies in Abell clusters . ... Digitized Sky Survey images . Faint Images of Radio Survey at Twenty-cm at VLA . ...

... Here comes the SKA. ... HI Gas and Star Formation neutral atomic hydrogen gas cloud (HI) molecular gas cloud (H2) star formation Redshift, Observing the Past The Expanding Universe Hubble`s Law redshift velocity related to distance ... (due to light travel time) Hubble`s Law redshift velocity related to distance distance related to age (due to light travel time) Atmospheric Transmission optical gamma rays, X-rays ultravio let infrared radio ...

... Extended ~ 10 pc scales low density ~ 102-103cm-3 1% 10 pc 1 kpc Krumholz+10 Sunday , October 6, 2013 star formation (IR-CO) relations at high redshifts Challenges: · Size measurements are difficult · CO-to-H2 gas mass conversion dubious Extended ~ 10 pc scales low density ~ 10 -10 cm · · · · · Greve+05 (12 SMGs + LIRGs ): Iono+09 (SMGs+ LIRGs , CO(3-2) only): Genzel+10 (10 SMGs + LIRGs ): Bothwell+13 ( 30 SMGs + ... 2010) Sunday, October 6, 2013 Observed (100hrs). ...