@misc{10481/93518,
year = {2024},
month = {6},
url = {https://hdl.handle.net/10481/93518},
abstract = {Tidal dwarf galaxies (TDGs) form in the debris of galaxy mergers, making them ideal testbeds for investigating star formation in an extreme environment. We present radio continuum EVLA observations spanning 1–2 GHz of the interacting system Arp 94, which contains the TDG J1023 + 1952. We detect extended radio continuum emission from the disc of the TDG’s putative parent galaxy, the spiral NGC 3227. The TDG lies in front of the spiral disc, partially o v erlapping in projection. This challenging alignment complicates the separation of the respective contributions of radio emission from the TDG and disc. Ho we ver, we show that the radio continuum appears more prominent around the TDG’s location, suggesting the detection of emission from the TDG. Quantifying this argument, we derive an upper limit of 2.2 mJy for the whole TDG’s emission. Our derived inband spectral index map of the system generally shows the expected behaviour of combined thermal and synchrotron radio emission in a galaxy disc, except for a region at the periphery of the disc and the TDG with a flat spectrum (spectral index ∼−0.4) unrelated to regions with high H αemission. We speculate that at this location –which coincides with the intersection of faint tidal tails –the collision of gas clouds produces shocks which re-accelerate cosmic ray electrons, and thereby enhance the radio emission. Overall, this study provides new insights about the Arp 94 system and expands the sample of TDGs studied at radio frequencies, with only two confirmed detections so far.},
organization = {Astrofísica de Canarias under the IAC 2021 International Scholarships Program},
organization = {project PID2020-114414GB-I00 financed by the Spanish Ministerio de Ciencia e Innovación(MCIN/AEI/10.13039/501100011033), and the Junta de Andalucía (Spain) grant FQM108},
organization = {PID2022-138560NB- I00, funded by the Spanish Ministerio de Ciencia e Innovación and the European Regional Development Funds (FEDER)(MCIN/AEI/10.13039/501100011033/FEDER, EU)},
organization = {National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Asso- ciated Universities},
publisher = {Oxford academic},
keywords = {galaxies: dwarf},
keywords = {galaxies: interactions},
keywords = {galaxies: star formation},
title = {Radio continuum emission from a tidal dwarf galaxy},
doi = {10.1093/mnras/stae1437},
author = {Moncada-Cuadri, Blanca M. and Lisenfeld, Ute and Miguel, Miguel and Mundell, Carole},
}