Book contents
- Frontmatter
- Contents
- Preface
- List of Participants
- I INTRODUCTION
- II THE INNER PARSEC
- III THE CIRCUMNUCLEAR REGION
- IV GAS DYNAMICS AND STAR FORMATION IN BARRED AND NORMAL GALAXIES
- V NUCLEAR GAS AND LARGE-SCALE PROPERTIES OF AGN AND STARBURST HOSTS
- VI HOST GALAXY-AGN-NUCLEAR STARBURST CONNECTION
- VII GALAXY INTERACTIONS AND INDUCED ACTIVITY
- VIII GAS DYNAMICS IN ELLIPTICALS
- Cold Gas in Early–Type Galaxies (Invited paper)
- Gas Kinematics in the LINER Radio Elliptical Galaxy NGC 4278
- Environmental Induced Star Formation in Galactic Cooling Flows
- Photometry of a Complete Sample of Virgo Ellipticals (Poster paper)
- Discovery of Very Red Colors in GPS Radio Galaxies (Poster paper)
- Are All Elliptical Galaxies Active? (Poster paper)
- Habitat Segregation of Elliptical Galaxies (Poster paper)
- Nebular Properties and the Origin of the Interstellar Medium in Elliptical Galaxies (Poster paper)
- IX AGN AND STARBURST HOSTS AT LARGE REDSHIFTS
- X CONFERENCE SUMMARY
- Subject Index
- Object Index
- Author Index
Discovery of Very Red Colors in GPS Radio Galaxies (Poster paper)
Published online by Cambridge University Press: 05 May 2010
- Frontmatter
- Contents
- Preface
- List of Participants
- I INTRODUCTION
- II THE INNER PARSEC
- III THE CIRCUMNUCLEAR REGION
- IV GAS DYNAMICS AND STAR FORMATION IN BARRED AND NORMAL GALAXIES
- V NUCLEAR GAS AND LARGE-SCALE PROPERTIES OF AGN AND STARBURST HOSTS
- VI HOST GALAXY-AGN-NUCLEAR STARBURST CONNECTION
- VII GALAXY INTERACTIONS AND INDUCED ACTIVITY
- VIII GAS DYNAMICS IN ELLIPTICALS
- Cold Gas in Early–Type Galaxies (Invited paper)
- Gas Kinematics in the LINER Radio Elliptical Galaxy NGC 4278
- Environmental Induced Star Formation in Galactic Cooling Flows
- Photometry of a Complete Sample of Virgo Ellipticals (Poster paper)
- Discovery of Very Red Colors in GPS Radio Galaxies (Poster paper)
- Are All Elliptical Galaxies Active? (Poster paper)
- Habitat Segregation of Elliptical Galaxies (Poster paper)
- Nebular Properties and the Origin of the Interstellar Medium in Elliptical Galaxies (Poster paper)
- IX AGN AND STARBURST HOSTS AT LARGE REDSHIFTS
- X CONFERENCE SUMMARY
- Subject Index
- Object Index
- Author Index
Summary
ABSTRACT
We present r – i colors of GHz–Peaked Spectrum (GPS) Radio Galaxies. We find that most GPS radio galaxies have r – i colors in the range of 0.2 – 0.4, typical of passively evolving elliptical galaxies. However, several have much redder colors in the range 1–2. We suggest several possible explanations for the very red colors, including (1) large amounts of dust in the galaxy, (2) a significant post-starburst population, and (3) a highly reddened active galactic nucleus. The red colors are consistent with a hypothesis in which significant mass transfer has occurred, producing a dense, clumpy, and possibly dusty ISM in the GPS host galaxy.
INTRODUCTION
GPS radio galaxies are characterized by the following properties: (1) a simple, convex, radio spectrum, peaking near 1 GHz, (2) mostly compact (sub kpc) radio structure, (3) low radio and optical polarization, and (4) low variability. We (O'Dea, Baum, and Stanghellini 1991) have suggested that the GPS galaxies have a dense, clumpy ISM (probably acquired externally via cannibalism) that confines and depolarizes the radio source. Our r and i band optical imaging has shown that the GPS galaxies are often in strongly interacting systems (Stanghellini et al. 1993).
THE R – I COLORS
We find that most GPS radio galaxies have integrated r – i colors in the range of 0.2 – 0.4, typical of passively evolving elliptical galaxies. This suggests that most GPS galaxies are not currently undergoing a significant starburst (though they might have in the past), unless the starburst population is highly obscured. However, several galaxies have much redder r – i colors in the range 1–2.
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- Mass-Transfer Induced Activity in Galaxies , pp. 444 - 445Publisher: Cambridge University PressPrint publication year: 1994