Multiwavelength study of the radio emission from a tight galaxy pair Arp 143
arXiv:1407.7369 · doi:10.1093/mnras/stu1475
Abstract
We present results of the recent low-frequency radio observations of a tight galaxy pair Arp 143 at 234 and 612 MHz. These data are analysed together with the archive data at 1490, 4860, 8440, and 14940 MHz. From the analysis of the radio emission we derive constraints on the age of the radio emitting structures as well as on the properties of their magnetic field. We show that the collisional ring of NGC 2445 hosts strong magnetic fields (reaching 12 G in its northwestern part) manifesting as a steep--spectrum, nonthermal radiation at radio frequencies. The spectral age of this structure is higher than estimates derived for the star-forming regions from the H distribution, suggesting that the radio emission might have a different origin. The galactic core is of a very young spectral age, suggesting an ongoing starburst activity. Additionally we identify a possible ridge of emission between the ring galaxy and its elliptical companion NGC 2444.
arXiv comment10 pages, 5 figures, 4 tables. Accepted for publication in MNRAS
References in corpus (7)
- Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
- The Equipartition Magnetic Field Formula in Starburst Galaxies: Accounting for Pionic Secondaries and Strong Energy Losses
- Unusual magnetic fields in the interacting spiral NGC 3627
- Stellar disks of Collisional Ring Galaxies I. New multiband images, Radial intensity and color profiles, and confrontation with N-body simulations
- Intergalactic magnetic fields in Stephan's Quintet
- The magnetic fields of large Virgo cluster spirals: Paper II
- Powerful H Emission and Star Formation on the Interacting Galaxy System Arp 143: Observations with Spitzer and GALEX