A NICMOS Survey of Early‐Type Galaxy Centers: The Relation Between Core Properties, Gas and Dust Content, and Environment | Zendy

Alice C. Quillen | Zendy; Gary Bower | Zendy; M. Stritzinger | Zendy

Open Access

A NICMOS Survey of Early‐Type Galaxy Centers: The Relation Between Core Properties, Gas and Dust Content, and Environment

Author(s) -

Alice C. Quillen,

Gary Bower,

M. Stritzinger

Publication year - 2000

Publication title -

the astrophysical journal supplement series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.546

H-Index - 277

eISSN - 1538-4365

pISSN - 0067-0049

DOI - 10.1086/313374

Subject(s) - physics , astrophysics , galaxy , luminosity , surface brightness , astronomy , star formation , elliptical galaxy , galaxy group , radius , stars , computer security , computer science

We present a NICMOS 1.6 micron imaging isophotal study of 27 early-typegalaxies. Our selected sample is not as biased against dusty galaxies as thevisible WFPC samples observed with HST. Core galaxies have reduced ellipticityand boxiness near and within their core or break radius. This supports a coreformation mechanism which mixes or scatters stars such as scattering caused bya binary black hole. We find no correlation between core properties and dustmass or X-ray luminosity, suggesting that processes determining the current gascontent (e.g., such as minor mergers and cooling flows) are unrelated toprocesses occurring during core formation. Core galaxies exist in a variety ofenvironments ranging from poor groups to large clusters. A combined samplesuggests that galaxy groups may harbor more luminous power law galaxies thanclusters such as Virgo and Fornax.Comment: Submitted to ApJS. Higher quality figures are available upon request: aquillen@as.arizona.ed

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