Photometry and dynamics of the minor mergers AM\,1228-260 and AM\,2058-381

Abstract

We investigate interaction effects on the dynamics and morphology of the galaxy pairs AM\,2058-381 and AM\,1228-260. This work is based on $r^{\prime }$ images and long-slit spectra obtained with the Gemini Multi-Object Spectrograph at the Gemini South Telescope. The luminosity ratio between the main (AM\,2058A) and secondary (AM\,2058B) components of the first pair is a factor of $\sim$ 5, while for the other pair, the main (AM\,1228A) component is 20 times more luminous than the secondary (AM\,1228B). The four galaxies have pseudo-bulges, with a Sérsic index $n<2$. Their observed radial velocities profiles (RVPs) present several irregularities. The receding side of the RVP of AM\,2058A is displaced with respect to the velocity field model, while there is a strong evidence that AM\,2058B is a tumbling body, rotating along its major axis. The RVPs for AM\,1228A indicate a misalignment between the kinematic and photometric major axes. The RVP for AM\,1228B is quite perturbed, very likely due to the interaction with AM\,1228A. NFW halo parameters for AM\,2058A are similar to those of the Milky Way and M\,31. The halo mass of AM\,1228A is roughly 10\% that of AM\,2058A. The mass-to-light (M/L) of AM\,2058 agrees with the mean value derived for late-type spirals, while the low M/L for AM\,1228A may be due to the intense star formation ongoing in this galaxy.

20 pages, 10 figures, accepted for publication in MNRAS

References in corpus (15)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• The effect of galaxy mass ratio on merger--driven starbursts
• The Structure of Classical Bulges And Pseudobulges: The Link Between Pseudobulges And Sersic Index
• The Metallicity of Galaxy Disks: Infall versus Outflow
• The long bar as seen by the VVV survey: I. Colour-magnitude diagrams
• Image Decomposition of Barred Galaxies and AGN Hosts
• Minor Galaxy Interactions: Star Formation Rates and Galaxy Properties
• Galaxy And Mass Assembly (GAMA): In Search of Milky-Way Magellanic Cloud Analogues
• Kinematic alignment of non-interacting CALIFA galaxies: Quantifying the impact of bars on stellar and ionised gas velocity field orientations
• Identikit 1: A Modeling Tool for Interacting Disk Galaxies
• Interaction effects on galaxy pairs with Gemini/GMOS- II: Oxygen abundance gradients
• Internal kinematics of modelled interacting disc galaxies
• Kinematics and physical properties of Southern interacting galaxies: the minor merger AM 2306-721
• Frequent Spin Reorientation of Galaxies due to Local Interactions

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