Abstract
The Astrophysical Journal
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Radio Morphology of Red Geysers
Namrata Roy1, Emily Moravec2, Kevin Bundy1,3, Martin J. Hardcastle4, Gülay Gürkan5, Ranieri Diego Baldi6, Sarah K. Leslie7, Karen Masters8, Joseph Gelfand9, Rogerio Riffel10,11Show full author list
Published 2021 December 1 • © 2021. The American Astronomical Society. All rights reserved.
The Astrophysical Journal, Volume 922, Number 2
Citation Namrata Roy et al 2021 ApJ 922 230
DOI 10.3847/1538-4357/ac24a0
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Abstract
We present 150 MHz, 1.4 GHz, and 3 GHz radio imaging (LoTSS, FIRST, and VLASS) and spatially resolved ionized gas characteristics (SDSS IV-MaNGA) for 140 local (z < 0.1) early-type red geyser galaxies. These galaxies have a low star formation activity (with a star formation rate, SFR, ∼ 0.01 M⊙ yr−1), but show unique extended patterns in spatially resolved emission-line maps that have been interpreted as large-scale ionized winds driven by active galactic nuclei (AGN). In this work, we confirm that red geysers host low-luminosity radio sources (L1.4GHz ∼ 1022WHz−1). Out of 42 radio-detected red geysers, 32 are spatially resolved in LoTSS and FIRST, with radio sizes varying between ∼5–25 kpc. Three sources have radio sizes exceeding 40 kpc. A majority display a compact radio morphology and are consistent with either low-power compact radio sources (FR0 galaxies) or radio-quiet quasars. They may be powered by small-scale AGN-driven jets that remain unresolved at the current 5'' resolution of radio data. The extended radio sources, not belonging to the "compact" morphological class, exhibit steeper spectra with a median spectral index of −0.67, indicating the dominance of lobed components. The red geysers hosting extended radio sources also have the lowest specific SFRs, suggesting they either have a greater impact on the surrounding interstellar medium or are found in more massive halos on average. The degree of alignment of the ionized wind cone and the extended radio features are either 0° or 90°, indicating possible interaction between the interstellar medium and the central radio AGN.
The American Astronomical Society, find out more.
The Institute of Physics, find out more.
A publishing partnership
Radio Morphology of Red Geysers
Namrata Roy1, Emily Moravec2, Kevin Bundy1,3, Martin J. Hardcastle4, Gülay Gürkan5, Ranieri Diego Baldi6, Sarah K. Leslie7, Karen Masters8, Joseph Gelfand9, Rogerio Riffel10,11Show full author list
Published 2021 December 1 • © 2021. The American Astronomical Society. All rights reserved.
The Astrophysical Journal, Volume 922, Number 2
Citation Namrata Roy et al 2021 ApJ 922 230
DOI 10.3847/1538-4357/ac24a0
DownloadArticle PDF DownloadArticle ePub
Figures
Tables
References
Article metrics
908 Total downloads
1616 total citations on Dimensions.
Permissions
Get permission to re-use this article
Share this article
Article and author information
Abstract
We present 150 MHz, 1.4 GHz, and 3 GHz radio imaging (LoTSS, FIRST, and VLASS) and spatially resolved ionized gas characteristics (SDSS IV-MaNGA) for 140 local (z < 0.1) early-type red geyser galaxies. These galaxies have a low star formation activity (with a star formation rate, SFR, ∼ 0.01 M⊙ yr−1), but show unique extended patterns in spatially resolved emission-line maps that have been interpreted as large-scale ionized winds driven by active galactic nuclei (AGN). In this work, we confirm that red geysers host low-luminosity radio sources (L1.4GHz ∼ 1022WHz−1). Out of 42 radio-detected red geysers, 32 are spatially resolved in LoTSS and FIRST, with radio sizes varying between ∼5–25 kpc. Three sources have radio sizes exceeding 40 kpc. A majority display a compact radio morphology and are consistent with either low-power compact radio sources (FR0 galaxies) or radio-quiet quasars. They may be powered by small-scale AGN-driven jets that remain unresolved at the current 5'' resolution of radio data. The extended radio sources, not belonging to the "compact" morphological class, exhibit steeper spectra with a median spectral index of −0.67, indicating the dominance of lobed components. The red geysers hosting extended radio sources also have the lowest specific SFRs, suggesting they either have a greater impact on the surrounding interstellar medium or are found in more massive halos on average. The degree of alignment of the ionized wind cone and the extended radio features are either 0° or 90°, indicating possible interaction between the interstellar medium and the central radio AGN.
| Original language | English |
|---|---|
| Pages (from-to) | 230 |
| Number of pages | 1 |
| Journal | The Astrophysical Journal |
| Volume | 922 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Dec 2021 |
Keywords
- 2134
- 1347
- 2033
- 16
- 429
- 572
- Astrophysics - Astrophysics of Galaxies
- Astrophysics - Cosmology and Nongalactic Astrophysics