Pitch angles of distant spiral galaxies |
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Authors: | S S Savchenko V P Reshetnikov |
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Institution: | (1) Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany |
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Abstract: | We have studied the pitch angles of spiral arms for 31 distant galaxies at z ∼ 0.7 from three Hubble Deep Fields (HDF-N, HDF-S, HUDF). Using the pitch angle-rotation velocity relation calibrated from
nearby galaxies, we have estimated the rotation velocities of galaxies from the deep fields. These estimates have a low accuracy
(∼50 km s−1), but they allow low-mass and giant galaxies to be distinguished. The Tully-Fisher relation constructed using our velocity
estimates shows satisfactory agreement with the actually observed relations for distant galaxies and provides evidence for
the luminosity evolution of spiral galaxies. |
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Keywords: | |
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