WFPC2 B-Band + Ly-Alpha Imaging of a Cluster of Young Galaxies at Z=2.40

Details WFPC2 B-Band + Ly-Alpha Imaging of a Cluster of Young Galaxies at Z=2.40 WFPC2 B-Band + Ly-Alpha Imaging of a Cluster of Young Galaxies at Z=2.40

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5985w&link_type=abstract

HST Proposal ID #5985

Computer Science

Hst Proposal Id #5985 Galaxies &Amp, Clusters

Scientific paper

We request 39 orbits (28 hr) with WFPC2 to obtain B- (F450W) and narrow-band redshifted Ly-Alpha imaging of a cluster of galaxies at z=2.40 recently discovered in deep WFPC2 V & I images. These contain two compact HST galaxies with spectroscopic z's=2.40, several candidates with excess light at 4120Angstrom in ground-based Ly-alpha-images, and several compact HST galaxies with blue continua and the UBVRIgriJHK colors of galaxies with zcge 2. The WFPC2 F410M-filter has exactly the right and DeltaLambda to image their Ly- alpha at z=2.40. The 10hr B-image will nearly match the existing V+I images in depth for blue galaxies, and be used to: (a) subtract the restframe UV-continuum to obtain a Ly- alpha-image at 0"pt 1 resolution; (b) study restframe UV- morphology and BVI color gradients to constrain stellar populations and dust at z=2.40; (c) do (b) for all foreground galaxies with z 1. The 18-hr Ly-alpha-image will be combined with deep ground-based Ly-alpha images to provide good S/N at 0.1---1.0" resolution, so that we can: (1) locate all Ly- Alpha emitting objects at z=2.40 within 3', determine their Ly -alpha fluxes and SFR; (2) study the sub-kpc starburst morphology of young star-forming galaxies at z=2.40, and locate their star-formation regions; (3) combined with CO- detections, determine the gas-to-stellar mass conversion rate and the efficiency of galaxy formation at z=2.40;

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