Bibcode
Muñoz-Tuñón, C.; Hinojosa Goñi, R.; Méndez Abreu, J.; Sánchez Alméida, J.
Bibliographical reference
Proceeding of the conference The Interplay between Local and Global Processes in Galaxies, Cozumel, Mexico, 2016-4, Eds. S. F. Sanchez, C. Morisset and G. Delgado-Inglada
Advertised on:
6
2016
Citations
0
Refereed citations
0
Description
The search for starbursts galaxies in COSMOS database by a tailored
procedure that uses the photometry from SUBARU, results in 220 targets
at z<0.5. The typical mass of the starburst is 10^8 and its
distribution is similar to that of the quiescent galaxies in the survey
at the same redshift range. From the detailed analysis of the galaxies
images using the HST, the star forming clumps are characterized. The
galaxies are of three different kinds, Snot, Snot and diffuse light and
multiple knots. The mass of the knots are typically one order of
magnitude below that of the host galaxy and the clumps in multiple knot
galaxies are bigger the closer they are to the center. The sSFR however
does not change with the particular position of the burst in their host
galaxy, which suggests a similar process independently of their
location. This result applies also to the galaxies at the largest z
range (0.9). Our interpretation is that the star formation is happening
at all possible locations on the galaxy discs, possibly from gas
accreted from the halo or the IGM, with clumps which grow as they spiral
and get to the centermost regions. Our previous work on nearby SF
-tadpole galaxies of similar mass reported metallicity drops coinciding
with the location of the burst what we have interpreted as SF driven by
cold flows. Our results in COSMOS would be consistent with a similar
interpretation and a scenario in which medium mass disks are growing by
gas accretion that show up as scattered starbursts knots.