Magnitude and size evolution of bulgeless galaxies

Abstract

We examine the magnitude and size evolution of bulgeless (discs with no-bulge or pseudo-bulge) galaxies up to z~0.9 in rest-frame B-band. Their evolution is compared to that of normal-discs (discs with classical-bulge). The study is done for luminous sources (M_B<=-20) in two equal-volume redshift-bins (0.4<=z<0.77 and 0.77<=z<1.0) and a local range (0.02<=z<0.05). The mean surface-brightness, from z_{mean}=0.89 to z_{mean}=0.04, shows a dimming of 0.79 mag for bulgeless galaxies and 1.16 mag for normal-discs. The characteristic magnitude, M_B^*, shows an increase of 0.55-mag for bulgeless galaxies and 0.95-mag for normal-discs. Both dimming and faintness observed since z~0.9 are more pronounced for the normal-discs by ~0.4-mag. The size-distribution is log-normal and both bulgeless and normal-discs show a slight increase in the mean value from z_{mean}=0.89 to z_{mean}=0.04. The proportion of bulgeless galaxies in the full disc sample undergoes a considerable decline with decrease in redshift. This along with the larger dimming and faintness seen for normal-discs suggests that some fraction of the bulgeless sources switch to the normal-disc morphology with time. To ascertain the validity of studying morphology in the optical, the properties of the galaxies observed in both rest-frame B and I-band are compared. The common sample is more luminous in the I-band but the sizes are larger in the B-band for more than 74 % of the sources. The variation in the sersic-index values of the galaxies in the two rest-bands is minor enough to have any affect on the morphological classification.

12 pages, 12 figures, accepted for publication in MNRAS

References in corpus (8)

• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• A primer on hierarchical galaxy formation: the semi-analytical approach
• The Structure of Classical Bulges And Pseudobulges: The Link Between Pseudobulges And Sersic Index
• Properties of Bars and Bulges in the Hubble Sequence
• The Kormendy relation of massive elliptical galaxies at z~1.5. Evidence for size evolution ?
• On the Origin of Exponential Galaxy Disks
• The Dependence of Galaxy Morphology and Structure on Environment and Stellar Mass
• The Size Function of Galaxy Disks out to z ~ 1 from the Canada-France-Hawaii-Telescope Legacy Survey

Cited by in corpus (11)

• Growth of bulges in disc galaxies since $z\sim 1$
• DGSAT: Dwarf Galaxy Survey with Amateur Telescopes II. A catalogue of isolated nearby edge-on disk galaxies and the discovery of new low surface brightness systems
• Survival of pure disk galaxies over the last 8 billion years
• The evolution of disc galaxies with and without classical bulges since z~1
• Environment, morphology and stellar populations of bulgeless low surface brightness galaxies
• Correlation of structure and stellar properties of galaxies in Stripe 82
• Formation of disc galaxies around z~2
• Red bulgeless galaxies in SDSS DR7. Are there any AGN hosts?
• Bright Compact Bulges (BCBs) at intermediate redshifts
• Redshift and stellar mass dependence of intrinsic shapes of disc-dominated galaxies from COSMOS observations below $z=1.0$
• COSMOS-Web: Galaxy Size and Surface Brightness Evolution at Rest-Frame 1.22 $\mu$m Since $z=3$