Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919805l&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #198.05; Bulletin of the American Astronomical Society,
Other
Scientific paper
Diffuse Interstellar Bands (DIBs) are hundreds of absorption features, typically associated with organic molecules, observed throughout the optical spectrum. There are only a handful of galaxies outside of the Milky Way with known DIB absorption. Understanding the source of the DIBs and the environments that are conducive for their appearance has implications in understanding galactic ISM. There are also possible implications in the likelihood of organic life arising in galaxies with an abundance of the DIB producing organic molecules as is theorized for our own Solar System.
We present our study of 7 damped Lyman-alpha (DLA) galaxies located from z 0.1 to z 0.5 as observed via background QSOs. Of the seven there are 6 non-detections with 3-sigma limits. There are multiple reasons why the DIBs could be unobservable in other galaxies when they are so readily seen in multiple sight-lines within the Milky Way. We discuss environmental factors that can inhibit or enhance DIB strengths assuming they are caused by organic molecules. These factors include metallicity, ionizing radiation, and dust content, as well as observer bias such as galaxy orientation. In the one detection of the 5780 Angstrom DIB along the QSO sight-line Q0235+164 the 4428 Angstrom DIB is previously known; furthermore, there is evidence that Q0235+164 has a significantly higher metallicity than the typical one-tenth solar common among DLAs at these redshifts.
Churchill Christopher W.
Ellison Sara L.
Johnson Rachel A.
Lawton Brandon L.
Ryan Sean G.
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