The spatial distribution of radiation in the complex ISM of distant ultraluminous galaxies

David Golimowski changed the aperture for Visit 03, Exposure 02 from WFC2-MRAMPQ to WFC1-MRAMPQ. (STScI support for WFC2-MRAMPQ aperture has been dropped because of internal calibration limitations.) ----- Attempting Submission 1 (Mon Jun 16 23:06:50 GMT 2008) ----- Phase II Proposal 11582 (stsci (Autosaved).rtf.apt) successfully submitted. ----- Attempting Submission 2 (Fri Jun 27 20:29:58 GMT 2008) ----- Phase II Proposal 11582 (20junA.apt) successfully submitted. ----- Attempting Submission 3 (Thu Jul 10 17:53:15 GMT 2008) ----- Phase II Proposal 11582 (27jun.apt) successfully submitted. ----- Attempting Submission 4 (Fri Jul 11 21:20:25 GMT 2008) ----- ----- Attempting Submission 5 (Wed Oct 21 14:47:39 GMT 2009) ----- Wavelength warnings still there, but I think these are OK Storing a version Assigned ID: 61 ----- Attempting Submission 1 (Tue Mar 04 23:14:40 GMT 2008) ----- Phase I Proposal 61 (NB08.apt) successfully submitted. ----- Attempting Submission 4 (Fri Mar 07 22:44:19 GMT 2008) ----- The spatial distribution of radiation in the complex ISM of distant ultraluminous galaxies A significant fraction of energy emitted by galaxies at redshifts when their stars were forming most vigorously, and when their blackholes were growing most powerfully emerges at far-infrared (IR) wavelengths. The fraction of this energy generated by the most extreme and luminous objects is also much larger than the equivalent fraction at optical wavelengths. Many of the most luminous far-IR sources have been located precisely and unambiguously using deep radio, Spitzer and optical observations, and have spectroscopic identifications using the largest ground-based telescopes. Surprisingly, however, the spectra of most of these heavily dust-enshrouded galaxies show prominent Lyman-alpha emission. We propose to observe five of the brightest examples at z~2-3 in re-activated ACS ramp filters, to resolve the spatial distribution of this line emission on fine kpc scales, in order to contrast and compare with the underlying ultraviolet (UV) continuum. Precise spectroscopic redshifts and the unique rest-UV resolution of HST are both essential to reveal the escape and generation of Lyman-alpha photons in the dusty ISM of these extreme galaxies. There is no other way to trace the detailed spatial distirbution of the most excited gas in a galactic wind, along with emission from less-massive star-forming galaxies in associated groups. The targets have available HST-resolution ground-based near-IR AO imaging and arcsec-scale images in CO from ground-based mm-wave interferometers, which provide context for spatial structure of evolved stars and the ISM. The interplay between restframe UV emission and the ISM in these galaxies has important consequences for understanding the origin of the prodigous luminosity of these systems, and for future observations with JWST and ALMA.

Narrow-band ramp-filter imaging of redshifted Lyman alpha emission from ultraluminous, but heavily-obscured galaxies. Corresponding broad band images in overlapping filters will also be taken for the 5 target galaxies. None None None COSMOLOGY 12 false 0.0 0 false false false false false false SUPPORTED GALAXY ULTRALUMINOUS IR GAL J2000 16 36 50.4300 +40 57 34.50 J2000 GALAXY ULTRALUMINOUS IR GAL J2000 02 39 52.0000 -01 35 57.50 J2000 GALAXY ULTRALUMINOUS IR GAL J2000 22 17 26.1000 +00 12 39.00 J2000 GALAXY ULTRALUMINOUS IR GAL J2000 10 51 55.5000 +57 23 13.00 J2000 ACS/WFC RampFilter No No FR423N CLEAR1L ACS/WFC Imaging No No F435W ACS/WFC RampFilter No No FR462N CLEAR1L ACS/WFC Imaging No No F475W CLEAR1L ACS/WFC RampFilter No No FR462N CLEAR1L ACS/WFC Imaging No No F475W ACS/WFC RampFilter No No FR505N ACS/WFC Imaging No No F475W ACS/WFC RampFilter No No FR388N ACS/WFC Imaging No No F435W POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1

false

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