Integral field spectroscopy of 23 spiral bulges

D. Batcheldor, D. Axon, D. Merritt, M. A. Hughes, A. Marconi, J. Binney, A. Capetti, M. Merrifield, C. Scarlata, W. Sparks

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We have obtained integral-field spectroscopy for 23 spiral bulges using INTEGRAL on the William Herschel Telescope and SPIRAL on the Anglo-Australian Telescope. This is the first two-dimensional survey directed solely at the bulges of spiral galaxies. Eleven galaxies of the sample do not have previous measurements of the stellar velocity dispersion (σ*). These data are designed to complement our Space Telescope Imaging Spectrograph program for estimating black hole masses in the range 106-108 M using gas kinematics from nucleated disks. These observations will serve to derive the stellar dynamical bulge properties using the traditional Mg b and Ca II triplets. We use both cross-correlation and maximum penalized likelihood to determine projected σ* in these systems and present radial velocity fields, major axis rotation curves, curves of growth, and σ* fields. Using cross-correlation to extract the low-order two-dimensional stellar dynamics we generally see coherent radial rotation and irregular velocity dispersion fields suggesting that is a nontrivial parameter to estimate.

Original languageEnglish (US)
Pages (from-to)76-86
Number of pages11
JournalAstrophysical Journal, Supplement Series
Volume160
Issue number1
DOIs
StatePublished - Sep 2005

Keywords

  • Galaxies: kinematics and dynamics
  • Galaxies: spiral
  • Stellar dynamics
  • Techniques: spectroscopic

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