Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-07-18
Astronomy and Astrophysics
Astrophysics
AAS Latex + PS Figures. This paper could be of some interest to people working on ISOCAM data. However, it is not extremely ex
Scientific paper
We consider 9 fields of low ecliptic latitude observed at 12 microns centered on QSOs. In these fields we detect 7 additional background sources at the level of 0.4-4mJy in 70 square arcminutes. 4 of these sources correspond to galaxies seen in the Digitized Sky Survey. 3 of these sources are not observed in this survey. The 4 sources with optical counterparts are low redshift objects with low infrared to optical flux ratios and so low inferred infrared luminosities L_FIR <~ 10^9 L_solar. Statistical arguments suggest that the unidentified sources are more likely to be distant L_FIR > 10^10 L_solar starbursting galaxies, rather than asteroids or late-type stars. 2 of our QSO fields are likely to have starbursting galaxies at moderately high redshift near the QSO (in angular scale). Since the lensing optical depth towards these QSOs is expected to peak at moderate redshift there is some possibility that these galaxies are in clusters that lense the QSOs. If none of our sources are asteroids then the number of small (km) sized main belt asteroids cannot be larger than 500,000 per absolute magnitude bin.
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