Infrared objects near to H2O masers in regions of active star formation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Astronomy, Interstellar Masers, Protostars, Star Formation, Water Masers, Astronomical Catalogs, Astronomical Photometry, Hydrogen Clouds

Scientific paper

Sources with (K)-(L) colors greater than 2 were found in a sample of 46 H2O masers using 3.6 micron photometric measurements. Many of these sources have near infrared energy distributions similar to known pre-main sequence objects; a number of infrared objects increases with the H2O maser distance and the (K)-(L) color indicates that the infrared and maser sources are related. Eleven of the infrared objects are coincident with the H2O masers; however, a statistical analysis of the observed angular separations shows that positional incidences may be involved in a larger sample of 18 objects, and that a distribution of the actual separations broader than a few arc-s is not likely.

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