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Autor(en) / Beteiligte
Titel
BULGELESS GALAXIES AT INTERMEDIATE REDSHIFT: SAMPLE SELECTION, COLOR PROPERTIES, AND THE EXISTENCE OF POWERFUL ACTIVE GALACTIC NUCLEI
Ist Teil von
  • The Astrophysical journal, 2014-02, Vol.782 (1), p.1-20
Ort / Verlag
United States
Erscheinungsjahr
2014
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
  • We present a catalog of bulgeless galaxies, which includes 19,225 objects selected in four of the deepest, largest multi-wavelength data sets available-COSMOS, AEGIS, GEMS, and GOODS-at intermediate redshift (0.4 [< or =, slant] z [< or =, slant] 1.0). The morphological classification was provided by the Advanced Camera for Surveys General Catalog (ACS-GC), which used publicly available data obtained with the ACS instrument on the Hubble Space Telescope. Rest-frame photometric quantities were derived using kcorrect. We analyze the properties of the sample and the evolution of pure-disk systems with redshift. Very massive [log(M sub(*)/M sub([middot in circle])) > 10.5] bulgeless galaxies contribute to ~30% of the total galaxy population number density at z [> or =, slanted] 0.7, but their number density drops substantially with decreasing redshift. We show that only a negligible fraction of pure disks appear to be quiescent systems, and red sequence bulgeless galaxies show indications of dust-obscured star formation. X-ray catalogs were used to search for X-ray emission within our sample. After visual inspection and detailed parametric morphological fitting we identify 30 active galactic nuclei (AGNs) that reside in galaxies without a classical bulge. The finding of such peculiar objects at intermediate redshift shows that while AGN growth in merger-free systems is a rare event (0.2% AGN hosts in this sample of bulgeless galaxies), it can indeed happen relatively early in the history of the universe.
Sprache
Englisch
Identifikatoren
ISSN: 0004-637X
eISSN: 1538-4357
DOI: 10.1088/0004-637X/782/1/22
Titel-ID: cdi_osti_scitechconnect_22348056

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