Jellyfish Galaxy Candidates at Low Redshift
Bianca M. Poggianti,G. Fasano,A. Omizzolo,Marco Gullieuszik,Daniela Bettoni,Alessia Moretti,A. Paccagnella,A. Paccagnella,Yara L. Jaffé,Benedetta Vulcani,Jacopo Fritz,Warrick J. Couch,Mauro D'Onofrio +12 more
TLDR
In this article, the authors conducted a systematic search for galaxies that are being stripped of their gas at low-z (z=0.04-0.07) in different environments, selecting galaxies with varying degrees of morphological evidence for stripping.Abstract:
Galaxies that are being stripped of their gas can sometimes be recognized from their optical appearance. Extreme examples of stripped galaxies are the so-called ``jellyfish galaxies'', that exhibit tentacles of debris material with a characteristic jellyfish morphology. We have conducted the first systematic search for galaxies that are being stripped of their gas at low-z (z=0.04-0.07) in different environments, selecting galaxies with varying degrees of morphological evidence for stripping. We have visually inspected B and V-band images and identified 344 candidates in 71 galaxy clusters of the OMEGAWINGS+WINGS sample and 75 candidates in groups and lower mass structures in the PM2GC sample. We present the atlas of stripping candidates and a first analysis of their environment and their basic properties, such as morphologies, star formation rates and galaxy stellar masses. Candidates are found in all clusters and at all clustercentric radii, and their number does not correlate with the cluster velocity dispersion sigma or X-ray luminosity L_X. Interestingly, convincing cases of candidates are also found in groups and lower mass haloes (10^{11}-10^{14} M_{sun}), although the physical mechanism at work needs to be securely identified. All the candidates are disky, have stellar masses ranging from log M/M_{sun} 11.5 and the majority of them form stars at a rate that is on average a factor of 2 higher (2.5 sigma) compared to non-stripped galaxies of similar mass. The few post-starburst and passive candidates have weak stripping evidence. We conclude that the stripping phenomenon is ubiquitous in clusters and could be present even in groups and low mass haloes. Further studies will reveal the physics of the gas stripping and clarify the mechanisms at work.read more
Citations
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Journal ArticleDOI
GASP. I. Gas Stripping Phenomena in Galaxies with MUSE
Bianca M. Poggianti,Alessia Moretti,Marco Gullieuszik,Jacopo Fritz,Yara L. Jaffé,Daniela Bettoni,Giovanni Fasano,Callum Bellhouse,Callum Bellhouse,George K. T. Hau,Benedetta Vulcani,Benedetta Vulcani,Andrea Biviano,Alessandro Omizzolo,Angela Paccagnella,Angela Paccagnella,Mauro D'Onofrio,Antonio Cava,Yun-Kyeong Sheen,Warrick J. Couch,Matt S. Owers,Matt S. Owers +21 more
TL;DR: GASP (GAs Stripping Phenomena in galaxies with MUSE) as discussed by the authors is a new integral field spectroscopic survey at the VLT aiming at studying gas removal processes in galaxies.
Journal ArticleDOI
GASP. IX. Jellyfish galaxies in phase-space: an orbital study of intense ram-pressure stripping in clusters
Yara L. Jaffé,Yara L. Jaffé,Bianca M. Poggianti,Alessia Moretti,Marco Gullieuszik,Rory Smith,Benedetta Vulcani,Benedetta Vulcani,Giovanni Fasano,Jacopo Fritz,Stephanie Tonnesen,Daniela Bettoni,George Hau,Andrea Biviano,Callum Bellhouse,Sean L. McGee +15 more
TL;DR: In this article, the authors investigated the orbital histories of jellyfish galaxies in clusters and reconstruct their stripping history through position vs. velocity phase-space diagrams, and found that the jellyfish with the longest gas tails reside very near the cluster cores and are moving at very high speeds, which coincides with the conditions of the most intense ram-pressure.
Journal ArticleDOI
Ram-pressure feeding of supermassive black holes
Bianca M. Poggianti,Yara L. Jaffé,Alessia Moretti,Marco Gullieuszik,Mario Radovich,Stephanie Tonnesen,Jacopo Fritz,Daniela Bettoni,Benedetta Vulcani,Benedetta Vulcani,Giovanni Fasano,Callum Bellhouse,Callum Bellhouse,George Hau,Alessandro Omizzolo +14 more
TL;DR: Analysis of the galactic position and velocity relative to the cluster strongly supports the first hypothesis, and puts forward ram pressure as another possible mechanism for feeding the central supermassive black hole with gas.
Journal ArticleDOI
GASP I: Gas stripping phenomena in galaxies with MUSE
Bianca M. Poggianti,Alessia Moretti,Marco Gullieuszik,Jacopo Fritz,Yara L. Jaffé,Daniela Bettoni,Giovanni Fasano,Callum Bellhouse,Callum Bellhouse,George K. T. Hau,Benedetta Vulcani,Benedetta Vulcani,Andrea Biviano,Alessandro Omizzolo,Angela Paccagnella,Angela Paccagnella,Mauro D'Onofrio,Antonio Cava,Yun-Kyeong Sheen,Warrick J. Couch,Matt S. Owers,Matt S. Owers +21 more
TL;DR: GASP (GAs Stripping Phenomena in galaxies with MUSE) as mentioned in this paper is a new integral field spectroscopic survey at the VLT aiming at studying gas removal processes in galaxies.
Journal ArticleDOI
Jellyfish galaxies with the IllustrisTNG simulations: I. Gas-stripping phenomena in the full cosmological context
Kiyun Yun,Annalisa Pillepich,Elad Zinger,Dylan Nelson,Martina Donnari,Gandhali D. Joshi,Vicente Rodriguez-Gomez,Shy Genel,Shy Genel,Rainer Weinberger,Mark Vogelsberger,Lars Hernquist +11 more
TL;DR: In this article, the authors use IllustrisTNG, a suite of gravity and MHD simulations, to study the demographics and properties of jellyfish galaxies in the full cosmological context.
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