Physical Properties, Star Formation, and Active Galactic Nucleus Activity in Balmer Break Galaxies at 0 < z < 1

Abstract

We present a spectroscopic study with the derivation of the physical properties of 37 Balmer break galaxies, which have the necessary lines to locate them in star-forming-AGN diagnostic diagrams. These galaxies span a redshift range from 0.045 to 0.93 and are somewhat less massive than similar samples of previous works. The studied sample has multiwavelength photometric data coverage from the ultraviolet to MIR Spitzer bands. We investigate the connection between star formation and AGN activity via optical, mass-excitation (MEx) and MIR diagnostic diagrams. Through optical diagrams, 31 (84%) star-forming galaxies, 2 (5%) composite galaxies and 3 (8%) AGNs were classified, whereas from the MEx diagram only one galaxy was classified as AGN. A total of 19 galaxies have photometry available in all the IRAC/Spitzer bands. Of these, 3 AGN candidates were not classified as AGN in the optical diagrams, suggesting they are dusty/obscured AGNs, or that nuclear star formation has diluted their contributions. Furthermore, the relationship between SFR surface density (Σ_{SFR}) and stellar mass surface density per time unit (Σ_{M_{\ast}/τ}) as a function of redshift was investigated using the [OII] \lambda3727, 3729, Hα\lambda6563 luminosities, which revealed that both quantities are larger for higher redshift galaxies. We also studied the SFR and SSFR versus stellar mass and color relations, with the more massive galaxies having higher SFR values but lower SSFR values than less massive galaxies. These results are consistent with previous ones showing that, at a given mass, high-redshift galaxies have on average larger SFR and SSFR values than low-redshift galaxies. Finally, bluer galaxies have larger SSFR values than redder galaxies and for a given color the SSFR is larger for higher redshift galaxies.

preprint version, 36 pages, 17 figures, 3 tables, accepted for publication in the Astrophysical Journal

References in corpus (21)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Host Galaxies and Classification of Active Galactic Nuclei
• The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
• A New Sample of Low-mass Black Holes in Active Galaxies
• The Subaru/XMM-Newton Deep Survey (SXDS) - II. Optical Imaging and Photometric Catalogs
• The Coincidence of Nuclear Star Clusters and Active Galactic Nuclei
• Optical spectroscopy and X-ray detections of a sample of quasars and AGN selected in the mid-infrared from two Spitzer wide-area surveys
• Chandra and Spitzer unveil heavily obscured quasars in the SWIRE/Chandra Survey
• The Subaru/XMM-Newton Deep Survey (SXDS): III. X-Ray Data
• Effects of AGN feedback on LCDM galaxies
• The Detection of a Red Sequence of Massive Field Galaxies at z~2.3 and its Evolution to z~0
• The role of AGN in the colour transformation of galaxies at redshifts z~1
• Measuring the Average Evolution of Luminous Galaxies at z<3: The Rest-frame Optical Luminosity Density, Spectral Energy Distribution, and Stellar Mass Density
• AEGIS: Demographics of X-ray and Optically Selected AGNs
• AGN and Starburst Classification from Spitzer Mid-Infrared Spectra for High Redshift SWIRE Sources
• Physical properties of galaxies and their evolution in the VIMOS VLT Deep Survey. I. The evolution of the mass-metallicity relation up to z~0.9
• The evolution of early and late type galaxies in the COSMOS up to z~1.2
• The XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS)
• Low-Mass Seyfert 2 Galaxies in the Sloan Digital Sky Survey
• Elusive AGN in the XMM-Newton bright serendipitous survey
• Host Galaxies of Hard X-ray Selected Type-2 Active Galactic Nuclei at Intermediate Redshifts

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• AGN Emission Line Diagnostics and the Mass-Metallicity Relation up to Redshift z~2: the Impact of Selection Effects and Evolution
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• The Subaru-XMM-Newton Deep Survey (SXDS) VIII.: Multi-wavelength Identification, Optical/NIR Spectroscopic Properties, and Photometric Redshifts of X-ray Sources
• The Obscured Fraction of Quasars at Cosmic Noon
• Star formation activity in Balmer break galaxies at $z$ < 1.5
• Physical properties of distant red galaxies in the COSMOS/UltraVISTA field