Star Formation Rate Distribution in the Galaxy NGC 1232
arXiv:1805.09911 · doi:10.3847/1538-3881/aab6b2
Abstract
NGC 1232 is a face-on spiral galaxy and a great laboratory for the study of star-formation due to its proximity. We obtained high spatial resolution Hα images of this galaxy, with adaptive optics, using the SAM instrument at the SOAR telescope, and used these images to study its H ii regions. These observations allowed us to produce the most complete H ii region catalog for it to date, with a total of 976 sources. This doubles the number of H ii regions previously found for this object. We used these data to construct the H ii luminosity function, and obtained a power-law index lower than the typical values found for Sc galaxies. This shallower slope is related to the presence of a significant number of high-luminosity H ii regions (logL>39 dex). We also constructed the size distribution function, verifying that, as for most galaxies, NGC 1232 follows an exponential law. We also used the Hα luminosity to calculate the star formation rate. An extremely interesting fact about this galaxy is that X-ray diffuse observations suggest that NGC 1232 recently suffered a collision with a dwarf galaxy. We found an absence of star formation around the region where the X-ray emission is more intense, which we interpret as a star formation quenching due to the collision. Along with that, we found an excess of star-forming regions in the northeast part of the galaxy, where the X-ray emission is less intense.
arXiv comment13 pages + table (27 pages), 8 figures
References in corpus (20)
- Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
- The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
- The Calibration of Mid-Infrared Star Formation Rate Indicators
- Comparison of H-alpha and UV Star Formation Rates in the Local Volume: Systematic Discrepancies for Dwarf Galaxies
- High Mass, OB Star Formation in M51 : HST Halpha and Palpha Imaging
- A VLT study of metal-rich extragalactic H II regions. I. Observations and empirical abundances
- Arm & Interarm Star Formation in Spiral Galaxies
- On the Form of the HII Region Luminosity Function
- Constraining corotation from shocks in tightly-wound spiral galaxies
- Characterizing spiral arm and interarm star formation
- Neutral Gas Distribution and Kinematics of the Nearly Face-on Spiral Galaxy NGC 1232
- Multiwavelength star formation indicators: Observations
- Statistical properties of HII regions in the disc of M100
- Spiral Galaxies with HST/NICMOS. II. Isophotal Fits and Nuclear Cusp Slopes
- Star formation in grand-design, spiral galaxies. Young, massive clusters in the near-infrared
- A Spectral Atlas of HII Galaxies in the Near-Infrared
- Properties of the HII region populations of M51 and NGC 4449 from Halpha images with ACS on HST
- Density waves and star formation in grand design spirals
- SOAR Adaptive Optics Observations of the Globular Cluster NGC6496
- X-ray discovery of a dwarf-galaxy galaxy collision