11257(  1) - 03/30/07 11:11  - [  1]

                  HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11257

Version: 1    Check-in Time: 30-Mar-2007 15:11:33       STScI Edit Number: 0

Title
Dust lanes since z~1
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Type             Cycle     Parallel Pointing Tolerance
AR               16        <none>
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Investigators
                                                                                     Contact?
    PI: Dr. Benne Willem Holwerda         Space Telescope Science Institute
   CoI: Ms. Mirela Obric                  University of Washington                      N
   CoI: Dr. Julianne Dalcanton            University of Washington                      N
   CoI: Dr. Puragra Guhathakurta          University of California - Santa Cruz         N
   CoI: Dr. Anton Koekemoer               Space Telescope Science Institute             N

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Abstract

Dust lanes are an iconic part of edge-on spirals which predominantly occur in the
larger faster-rotating disks (V > 120 km/s). This observational fact has now been
well established and linked to the vertical gravitational stability of spiral disks:
the ISM in the massive disks collapses into the thin lanes. A survey of distant
(z<1) edge-on spirals in the Extended Groth Strip will give the corresponding
critical velocity at which dust lanes appear and the fraction of spirals that
display them. This will allow us to study the evolution in dust disks with redshift.
This survey will have implications for the number of massive HI-rich disks, the
balance between ISM and SFR in earlier disks and the Tully-Fisher relation.
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