SDSS-IV MaNGA: the nature of an off-galaxy Hα blob: a multiwavelength view of offset cooling in a merging galaxy group
| Autor: | Francesco Belfiore, Chien-Hsiu Lee, Joseph D. Gelfand, Dmitry Bizyaev, Stephen Gwyn, Diana M Worrall, Kevin Bundy, Matt Bothwell, David R. Law, José G. Fernández-Trincado, Sebastián F. Sánchez, Michał J. Michałowski, Lihwai Lin, Sébastien Peirani, Cheng Li, Hai Fu, Bau-Ching Hsieh, Alexei Moiseev, Ewan O'Sullivan, Song Huang, D. Stark, Hsi-An Pan, D. V. Oparin |
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| Přispěvatelé: | Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
cooling flows
galaxy groups (597) Brightness Active galactic nucleus Offset (computer science) 010504 meteorology & atmospheric sciences Astrophysics::High Energy Astrophysical Phenomena Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences chemistry.chemical_compound symbols.namesake Galaxy group 0103 physical sciences Compounds of carbon 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics chemistry.chemical_classification cooling flows (2028) galaxy groups galaxy interactions Balmer series Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy chemistry 13. Climate action Space and Planetary Science [SDU]Sciences of the Universe [physics] active galactic nuclei symbols galaxy interactions (600) Carbon monoxide active galactic nuclei (16) |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, American Astronomical Society, 2020, 903 (1), pp.16. ⟨10.3847/1538-4357/abb80c⟩ Pan, H-A, Worrall, D M, Peirani, S & al., E 2020, ' SDSS-IV MaNGA : The Nature of an Off-galaxy H$α$ Blob--A Multi-wavelength View of Offset Cooling in a Merging Galaxy Group ', Astrophysical Journal . https://doi.org/10.3847/1538-4357/abb80c |
| ISSN: | 0004-637X 1538-4357 |
| Popis: | Galaxies in dense environments, such as groups and clusters, experience various processes by which galaxies gain and lose gas. Using data from the SDSS-IV MaNGA survey, we previously reported the discovery of a giant (6 -- 8 kpc in diameter) H$\alpha$ blob, Totoro, about 8 kpc away from a pair of galaxies (Satsuki and Mei) residing in a galaxy group which is experiencing a group-group merger. Here, we combine interferometric $^{12}$CO(1--0) molecular gas data, new wide-field H$\alpha$, $u$-band data, and published X-ray data to determine the origin of the blob. Several scenarios are discussed to account for its multi-wavelength properties, including (1) H$\alpha$ gas being stripped from galaxy Satsuki by ram-pressure; (2) a separated low-surface-brightness galaxy; (3) gas being ejected or ionized by an active galactic nucleus (AGN); and (4) a cooling intra-group medium (IGM). Scenarios (1) and (2) are less favored by the present data. Scenario (3) is also less likely as there is no evidence for an active ongoing AGN in the host galaxy. We find that the CO (cold) and H$\alpha$ (warm) gas coexist with X-ray (hot) structures; moreover, the derived cooling time is within the regime where molecular and H$\alpha$ gas are expected. The coexistence of gas with different temperatures also agrees with that of cooling gas in other systems. Our multi-wavelength results strongly suggest that the CO and H$\alpha$ gas are the product of cooling from the IGM at its current location, i.e., cooling has occurred, and may be ongoing, well outside the host-galaxy core. Comment: 23 pages, 10 figures, Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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