NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-07-21 T06:40:55 PDT
Help | Comment | NED Home

For refcode 2014ApJ...782...22B:
There are 56144 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2014ApJ...782...22B Bulgeless Galaxies at Intermediate Redshift: Sample Selection, Color Properties, and the Existence of Powerful Active Galactic Nuclei Bizzocchi, Luca; Filho, Mercedes E.; Leonardo, Elvira; Grossi, Marco; Griffith, Roger L.; Afonso, Jose; Fernandes, Cristina; Retre, Joao; Anton, Sonia; Bell, Eric F.; Brinchmann, Jarle; Henriques, Bruno; Lobo, Catarina; Messias, Hugo Abstract. 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 <= z <= 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_sstarf_/M_sun_) > 10.5] bulgeless galaxies contribute to ~30% of the total galaxy population number density at z >= 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. Key words: catalogs, galaxies: evolution, galaxies: structure, X-rays: galaxies
There are 56144 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home