Dust Deficiency in the Interacting Galaxy NGC 3077
  Using 70 $\mu$ m observations taken with the PACS instrument of the Herschel
space telescope, the dust content of the nearby and interacting spiral galaxy
NGC 3077 has been compared with the dust content of the isolated galaxies such
as NGC 2841, NGC 3184 and NGC 3351. The dust content has allowed us to derive
dust-to-gas ratios for the four spiral galaxies of our sample. We find that NGC
2841, NGC 3184 and NGC 3351 have dust masses of 6.5-9.1 $\times$ 10$^7$
M$\odot$, which are a factor of $\sim$10 higher than the value found for NGC
3077. This result shows that NGC 3077 is a dust deficient galaxy, as was
expected, because this galaxy is affected by tidal interactions with its
neighboring galaxies M81 and M82. NGC 3077 reveals a dust-to-gas ratio of
17.5%, much higher than the average ratio of 1.8% of the isolated galaxies,
evidencing that NGC 3077 is also deficient in H$_2$+HI gas. Therefore, it seems
that, in this galaxy, gas has been stripped more efficiently than dust.
