we propose to study the c ii emission line of 3 quasar absorption line systems toward s4 0248+43, pks 0038-019 and pks 1327-206. their corres- ponding redshifts are 0.0515, 0.0177 and 0.0175, respectively. the ab- sorption line system toward s4 0248+43 has been identified with a nearby starburst galaxy. these 3 absorber galaxies offer excellent sites to study the starburst and normal star formation activity at low redshifts. since they are at low redshift, optical and radio wavelength spectrosco- py, optical and near-ir imaging and iras observations provide a great deal of direct information about the physical properties of the absorber galaxies. toward these 3 sources (and almost 2 dozen other absorption line systems at different redshifts), we have obtained detections or li- mits on the co (and in some instances, c i) emission at radio wave- lengths. we also have programs at several radio telescopes to observe c ii toward high-z galaxies. the absorbers toward s4 0248+43, pks 0038-019 and pks 1327-206 are among the most luminous co emitters in our millimeter-wave survey of low redshift quasar absorption line systems, and will be good candidates for further mm- and sub-mm work. here we propose to obtain the redshifted 158 um c ii emission line spectrum to enable a comparison of these systems with other quasar absorption line systems at higher z. the lws data will complement the radio obser- vations to give a more complete picture of the physical conditions in these galaxies. from the c ii emission line measurements in associ- ation with complementary observations, we will be able to study the chemical abundance, molecular content, uv radiation field and dust-to- gas ratio of the ism in the absorber galaxies. in particular, from the c ii/co ratio we will be able to determine whether any of the ab- sorption line systems are undergoing a starburst.
Instrument
LWS02
Temporal Coverage
1997-06-13T07:30:53Z/1997-09-05T06:17:51Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, WALKER et al., 1998, '[C II] EMISSION AS A PROBE OF STARFORMATION IN ABSORPTION LINE SYSTEMS A STUDY OF STARFORMATION AT INTERMEDIATE LOOK-BACK TIMES', 1.0, European Space Agency, https://doi.org/10.5270/esa-5izlbcm
