Merger remnant in TXS 1033+026 - I: Hα and HI 21-cm observations suggest counter-rotating gas
Abstract
We conducted eMERLIN and Gemini integral field unit (IFU) observations towards TXS 1033+026, a post-merger ultraluminous infrared galaxy, to study the radio continuum and Hα and HI 21 cm lines at sub-kiloparsec scales. We find a symmetric, two-sided core- jet structure in both L-(≈ 1.4 GHz) and C-(≈ 4.8 GHz) band continuum images. The active galactic nucleus likely has a double-double radio morphology, indicating possible multiple episodes of activity. The Gemini IFU observations provided sub-arcsecond resolution. Results from these observations suggest the presence of a kiloparsec-scale circumnuclear, warped Hα disc that rotates around the core. The HI 21 cm maps reveal a complex kinematic structure, with indications of two counter-rotating gas components orbiting the core-jet axis; one of these components counter-rotates relative to the kiloparsec-scale Hα disc. However, the true morphology of this structure may be more complex than our interpretation suggests. We estimate a HI 21 cm velocity-integrated optical depth of 90 ± 3 km s−1. We note that these are the first results to probe Hα and cold neutral hydrogen gas in TXS 1033+026 at sub-kiloparsec scales.
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BibTeX
@misc{aditya2026merger,
title = {{Merger remnant in TXS 1033+026 - I: $\rm Hα$ and HI 21-cm observations suggest counter-rotating gas}},
author = {J. N. H. S. Aditya and Hyein Yoon and L. G. Dahmer-Hahn and Renzhi Su and Rajeshwari Dutta and Xiaolong Yang and Elaine Sadler and Matthew T. Whiting},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.03300},
eprint = {2610.03300},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.03300},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Merger remnant in TXS 1033+026 - I: Hα and HI 21-cm observations suggest counter-rotating gas
AU - J. N. H. S. Aditya
AU - Hyein Yoon
AU - L. G. Dahmer-Hahn
AU - Renzhi Su
AU - Rajeshwari Dutta
AU - Xiaolong Yang
AU - Elaine Sadler
AU - Matthew T. Whiting
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2610.03300
UR - https://arxiv.org/abs/2610.03300
AB - We conducted eMERLIN and Gemini integral field unit (IFU) observations towards TXS 1033+026, a post-merger ultraluminous infrared galaxy, to study the radio continuum and Hα and HI 21 cm lines at sub-kiloparsec scales. We find a symmetric, two-sided core- jet structure in both L-(≈ 1.4 GHz) and C-(≈ 4.8 GHz) band continuum images. The active galactic nucleus likely has a double-double radio morphology, indicating possible multiple episodes of activity. The Gemini IFU observations provided sub-arcsecond resolution. Results from these observations suggest the presence of a kiloparsec-scale circumnuclear, warped Hα disc that rotates around the core. The HI 21 cm maps reveal a complex kinematic structure, with indications of two counter-rotating gas components orbiting the core-jet axis; one of these components counter-rotates relative to the kiloparsec-scale Hα disc. However, the true morphology of this structure may be more complex than our interpretation suggests. We estimate a HI 21 cm velocity-integrated optical depth of 90 ± 3 km s^−1. We note that these are the first results to probe Hα and cold neutral hydrogen gas in TXS 1033+026 at sub-kiloparsec scales.
ER -