SIMBAD references

2009ApJ...706..553B - Astrophys. J., 706, 553-570 (2009/November-3)

Star-forming or starbursting? The ultraviolet conundrum.

BOQUIEN M., CALZETTI D., KENNICUTT R., DALE D., ENGELBRACHT C., GORDON K.D., HONG S., LEE J.C. and PORTOUW J.

Abstract (from CDS):

Compared to starburst galaxies, normal star-forming galaxies have been shown to display a much larger dispersion of the dust attenuation at fixed reddening through studies of the IRX-β diagram (the IR/UV ratio "IRX" versus the UV color "β"). To investigate the causes of this larger dispersion and attempt to isolate second parameters, we have used GALEX UV, ground-based optical, and Spitzer infrared imaging of eight nearby galaxies, and examined the properties of individual UV and 24 µm selected star-forming regions. We concentrated on star-forming regions, in order to isolate simpler star formation histories than those that characterize whole galaxies. We find that (1) the dispersion is not correlated with the mean age of the stellar populations; (2) a range of dust geometries and dust extinction curves are the most likely causes for the observed dispersion in the IRX-β diagram, (3) together with some potential dilution of the most recent star-forming population by older unrelated bursts, at least in the case of star-forming regions within galaxies; and (4) we also recover some general characteristics of the regions, including a tight positive correlation between the amount of dust attenuation and the metal content. Although generalizing our results to whole galaxies may not be immediate, the possibility of a range of dust extinction laws and geometries should be accounted for in the latter systems as well.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - infrared: galaxies - ultraviolet: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/706/553): table1.dat table4.dat>

Nomenclature: Table 4: [BCK2009b] NGC NNNN-A-NN N=324.

Status in Simbad:  will not be processed

Simbad objects: 10

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2009ApJ...706..553B and select 'bookmark this link' or equivalent in the popup menu


2020.01.27-01:44:52

© Université de Strasbourg/CNRS

    • Contact