Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7881t&link_type=abstract
HST Proposal ID #7881
Computer Science
Hst Proposal Id #7881 Galaxies
Scientific paper
We propose to perform deep NICMOS imaging in the F110W and F160W bands of the Blue Compact / Dwarf Irregular galaxies NGC1569 and NGC1705 to trace their major star formation episodes over a Hubble time. These two galaxies are among the closest starbursting dwarfs and therefore among those very few in which old, i.e. faint, stars can be resolved and measured, if present. They therefore provide an optimal opportunity to verify directly from individual star detection whether or not some starbursting galaxies have started to form stars only in relatively recent epochs {as suggested for IZw18}. If so, their contribution to galaxy count samples at early epochs {i.e. high redshifts} would be quite lower than estimated by extrapolating their current/local features. The only instrument capable of achieving this goal is NICMOS on HST, whose NIC2 camera provides the angular resolution and the magnitude limits necessary to reach and resolve with the required accuracy individual stars at the tip of the red giant branch {i.e. with age between 1 and 15 Gyr}. These stars have proven to be unreachable in the optical bands. Infrared color- magnitude diagrams {J, J-H} will allow us to evaluate the mass and the age of these stars. Combined with the available optical data and with our method of a theoretical interpretation based on synthetic color-magnitude diagrams, these data will firmly establish at what epochs these galaxies have formed stars.
No associations
LandOfFree
Starbursts: The First Generation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Starbursts: The First Generation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Starbursts: The First Generation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-896357