Tidal interaction, star formation and chemical evolution in blue compact dwarf galaxy Mrk 22

Abstract

The optical spectroscopic and radio interferometric HI 21 cm-line observations of the blue compact dwarf galaxy Mrk 22 are presented. The Wolf-Rayet (WR) emission line features corresponding to high ionization lines of HeII $\lambda$4686 and CIV $\lambda$5808 from young massive stars are detected. The ages of two prominent star forming regions in the galaxy are estimated as $\sim$10 Myr and $\sim$ 4 Myr. The galaxy has non-thermal radio deficiency, which also indicates a young star-burst and lack of supernovae events from the current star formation activities, consistent with the detection of WR emission lines features. A significant N/O enrichment is seen in the fainter star forming region. The gas-phase metallicities [12 + log(O/H)] for the bright and faint regions are estimated as 7.98$\pm$0.07 and 7.46$\pm$0.09 respectively. The galaxy has a large diffuse HI envelop. The HI images reveal disturbed gas kinematics and HI clouds outside the optical extent of the galaxy, indicating recent tidal interaction or merger in the system. The results strongly indicate that Mrk 22 is undergoing a chemical and morphological evolution due to ongoing star formation, most likely triggered by a merger.

18 pages, 13 figures, 3 tables, accepted for publication in MNRAS

References in corpus (23)

• The Host Galaxies and Classification of Active Galactic Nuclei
• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• The Origin of the Galaxy Mass-Metallicity Relation and Implications for Galactic Outflows
• The Current Status of Galaxy Formation
• Galaxies with Wolf-Rayet signatures in the low-redshift Universe - A survey using the Sloan Digital Sky Survey
• A Local Clue to the Reionization of the Universe
• Formation of blue compact dwarf galaxies from merging and interacting gas-rich dwarfs
• Precision abundance analysis of bright HII galaxies
• Satellite Dwarf Galaxies in a Hierarchical Universe: The Prevalence of Dwarf-Dwarf Major Mergers
• Extremely metal-poor star-forming galaxies. New detections and general morphological and photometric properties
• Linking Ly-alpha and Low-Ionization Transitions at Low Optical Depth
• The interplay between ionized gas and massive stars in the HII galaxy IIZw70: integral field spectroscopy with PMAS
• HI and star formation in the most metal-deficient galaxies
• The Dissipative Merger Progenitors of Elliptical Galaxies
• VCC 2062: an old Tidal Dwarf Galaxy in the Virgo Cluster?
• How extreme are the Wolf-Rayet clusters in NGC3125?
• Search for Blue Compact Dwarf Galaxies During Quiescence
• Oxygen abundance variations in the system of the two blue compact dwarf galaxies SBS 0335-052E and SBS 0335-052W
• Metal-poor dwarf galaxies in the SIGRID galaxy sample. I. HII region observations and chemical abundances
• The HI Chronicles of LITTLE THINGS BCDs II: The Origin of IC 10's HI Structure
• Spectrophotometric investigations of Blue Compact Dwarf Galaxies: Markarian 35
• A Study on the Chemical Properties of Blue Compact Dwarf Galaxies
• On the properties of the interstellar medium in extremely metal-poor blue compact dwarf galaxies: GMOS-IFU spectroscopy and SDSS photometry of the double-knot galaxy HS 2236+1344

Cited by in corpus (1)

• HI imaging of dwarf star-forming galaxies: Masses, morphologies and gas deficiencies