Infrared emission and the HI content of low-luminosity galaxies

Details Infrared emission and the HI content of low-luminosity galaxies Infrared emission and the HI content of low-luminosity galaxies

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..160o&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 160-160

Astronomy and Astrophysics

Astronomy

Scientific paper

The rotation curves of spiral galaxies can be described by a function that depends on the galaxy's luminosity only. Persic et al. (1996, MNRAS 281, 27), when grouping spirals into samples having approximately the same luminosity (and rotation curve), show that the low-luminosity galaxies have rotation curves that are still rising at their optical radius and beyond. Dark matter and non-Newtonian dynamics (MOND) have often been pointed out as the cause for this. However it is possible that these galaxies contain more gas than is usually claimed, if one considers that the emission is not optically thin and the spin temperature of the hydrogen is about 50 K. In this work we study a sample of the low-luminosity galaxies of Persic et al. to obtain a relationship between the HI and the infrared fluxes. The mid-infrared fluxes collected during the IRAS survey can be used to estimate the total amount of gas, especially in the cases where the 21-cm emission is near the optically thick regime. We find that these galaxies do not show significant infrared excesses in the IRAS bands and their HI integral flux does not deviate significantly from what is expected of Freeman's law for galactic disks.

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