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Date and Time of the Query: 2019-07-20 T11:23:24 PDT
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For refcode 2000A&A...354..836L:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2000A&A...354..836L Young massive star clusters in nearby spiral galaxies. III. Correlations between cluster populations and host galaxy properties. LARSEN S.S., RICHTLER T. Received 16 August 1999/Accepted 22 December 1999 Abstract: We present an analysis of correlations between integrated properties of galaxies and their populations of young massive star clusters. Data for 21 nearby galaxies presented by Larsen & Richtler (1999) are used together with literature data for 10 additional galaxies, spanning a range in specific U-band cluster luminosity T_L_(U) from 0 to 15. We find that T_L_(U) correlates with several observable host galaxy parameters, in particular the ratio of Far-Infrared (FIR) to B-band flux and the surface brightness. Taking the FIR luminosity as an indicator of the star formation rate (SFR), it is found that T_L_(U) correlates very well with the SFR per unit area. A similar correlation is seen between T_L_(U) and the atomic hydrogen surface density. The cluster formation efficiency seems to depend on the SFR in a continuous way, rather than being related to any particularly violent mode of star formation. We discuss fundamental features of possible scenarios for cluster formation. One possibility is that the correlation between T_L_(U) and SFR is due to a common controlling parameter, most probably the high density of the ISM. Another scenario conceives a high T_L_(U) as resulting from the energy input from many massive stars in case of a high SFR. Key words: galaxies: general - galaxies: spiral - galaxies: starburst - galaxies: star clusters - stars: formation
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