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The Kinematics and the Origin of the Ionized Gas in NGC 4036

from Part 5 - Bulge Phenomenology

Published online by Cambridge University Press:  10 November 2010

By
E.M. Corsini ,
F. Bertola ,
M. Sarzi ,
P. Cinzano ,
H.-W. Rix  and
W.W. Zeilinger
Edited by
C. Marcella Carollo ,
Henry C. Ferguson  and
Rosemary F. G. Wyse
E.M. Corsini
Affiliation:
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
F. Bertola
Affiliation:
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
M. Sarzi
Affiliation:
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
P. Cinzano
Affiliation:
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
H.-W. Rix
Affiliation:
Steward Observatory, University of Arizona, Tucson AZ-85721, USA
W.W. Zeilinger
Affiliation:
Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria
C. Marcella Carollo
Affiliation:
Columbia University, New York
Henry C. Ferguson
Affiliation:
Space Telescope Science Institute, Baltimore
Rosemary F. G. Wyse
Affiliation:
The Johns Hopkins University
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Summary

The kinematics of stars and ionized gas has been studied near the center of the SO galaxy NGC 4036. Dynamical models based both on stellar photometry and kinematics have been built in order to derive the gravitational potential in which the gas is expected to orbit. The observed gas rotation curve falls short of the circular velocity curve inferred from these models. Inside 10″ the observed gas velocity dispersion is found to be comparable to the predicted circular velocity, showing that the gas cannot be considered on circular orbits. The understanding of the observed gas kinematics is improved by models based on the Jeans Equations, which assume the ionized gas as an ensemble of collisionless cloudlets distributed in a spheroidal and in a disk component.

Introduction

NGC 4036 has been classified S03(8)/Sa in RSA (Sandage & Tammann 1981) and S0− in RC3 (de Vaucouleurs et al. 1991). Its total apparent magnitude is VT = 10.66 mag (RC3). This corresponds to a total luminosity Lv = 4.2 · 1010 at the assumed distance of d = V0/H0 = 30.2 Mpc, where V0 = 1509 ± 50 km s−1 (RSA) and assuming H0 = 50 km s−1 Mpc−1. At this distance the scale is 146 pc arcsec−1.

We measured the kinematics of stars and ionized gas along the galaxy major axis and derived their distribution in the nuclear regions by means of ground-based V-band and HST narrow-band imaging respectively.

Type
Chapter
Information
The Formation of Galactic Bulges , pp. 170 - 174
Publisher: Cambridge University Press
Print publication year: 2000

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  • The Kinematics and the Origin of the Ionized Gas in NGC 4036
    • By E.M. Corsini, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, F. Bertola, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, M. Sarzi, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, P. Cinzano, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, H.-W. Rix, Steward Observatory, University of Arizona, Tucson AZ-85721, USA, W.W. Zeilinger, Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria
  • Edited by C. Marcella Carollo, Columbia University, New York, Henry C. Ferguson, Space Telescope Science Institute, Baltimore, Rosemary F. G. Wyse, The Johns Hopkins University
  • Book: The Formation of Galactic Bulges
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564611.028
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  • The Kinematics and the Origin of the Ionized Gas in NGC 4036
    • By E.M. Corsini, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, F. Bertola, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, M. Sarzi, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, P. Cinzano, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, H.-W. Rix, Steward Observatory, University of Arizona, Tucson AZ-85721, USA, W.W. Zeilinger, Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria
  • Edited by C. Marcella Carollo, Columbia University, New York, Henry C. Ferguson, Space Telescope Science Institute, Baltimore, Rosemary F. G. Wyse, The Johns Hopkins University
  • Book: The Formation of Galactic Bulges
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564611.028
Available formats
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Save book to Google Drive

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  • The Kinematics and the Origin of the Ionized Gas in NGC 4036
    • By E.M. Corsini, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, F. Bertola, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, M. Sarzi, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, P. Cinzano, Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, H.-W. Rix, Steward Observatory, University of Arizona, Tucson AZ-85721, USA, W.W. Zeilinger, Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria
  • Edited by C. Marcella Carollo, Columbia University, New York, Henry C. Ferguson, Space Telescope Science Institute, Baltimore, Rosemary F. G. Wyse, The Johns Hopkins University
  • Book: The Formation of Galactic Bulges
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564611.028
Available formats
×