UBIQUITOUS GIANT Lyα NEBULAE AROUND THE BRIGHTEST QUASARS AT z ∼ 3.5 REVEALED WITH MUSE

By E. Borisova, S. Cantalupo, S. Lilly, R. Marino, Sofia G. Gallego, R. Bacon, Jérémy Blaizot, N. Bouch'e, J. Brinchmann, C. Carollo and 10 more. 2016

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Direct Lyα imaging of intergalactic gas at has recently revealed giant cosmological structures around quasars, e.g., the Slug Nebula. Despite their high luminosity, the detection rate of such systems in narrow-band and spectroscopic surveys is less than 10%, possibly encoding crucial information on the distribution of gas around quasars and the quasar emission properties. In this study, we use the MUSE integral-field instrument to perform a blind survey for giant nebulae around 17 bright radio-quiet quasars at that does not suffer from most of the limitations of previous surveys. After data reduction and analysis performed with specifically developed tools, we found that each quasar is surrounded by giant nebulae with projected sizes larger than 100 physical kiloparsecs and, in some cases, extending up to 320 kpc. The circularly averaged surface brightness profiles of the nebulae appear to be very similar to each other despite their different morphologies and are consistent with power laws with slopes . The similarity between the properties of all these nebulae and the Slug Nebula suggests a similar origin for all systems and that a large fraction of gas around bright quasars could be in a relatively “cold” (T ∼ 104 K) and dense phase. In addition, our results imply that such gas is ubiquitous within at least 50 kpc from bright quasars at independently of the quasar emission opening angle, or extending up to 200 kpc for quasar isotropic emission.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/c6c3eb0b025953adbe73d54399d54625e29b9388

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Citations in the corpus

The quest for dual and binary supermassive black holes: A multi-messenger view (2019, background): “For comparison, we note that other less extended and lower-luminosity nebulae (Borisova et al., 2016) and Lyα blobs (LABs) reported in literature do not contain multiple AGN.”
The realm of the galaxy protoclusters (2016, background): “…Geach et al., 2009; Yang et al., 2009; Fu & Stockton, 2009; Overzier et al., 2013; Bridge et al., 2013; Cantalupo et al., 2014; Hennawi et al., 2015; Borisova et al., 2016), star-forming galaxies (e.g., Ouchi et al., 2009; Colbert et al., 2011), and sometimes without a clearly identifiable source…”
The MUSE Hubble Ultra Deep Field Survey - VIII. Extended Lyman-α haloes around high-z star-forming galaxies (2017, background): “This scenario is usually invoked for giant Lyα nebulae, within which quasars are known to reside (Cantalupo et al. 2014; Borisova et al. 2016 and see Cantalupo 2017 for a review), as well as for compact dark galaxy sources (Cantalupo et al. 2012; Fumagalli et al. 2016; Marino et al. 2017).”
A characteristic scale for cold gas (2016, methodology): “While the origin of this cold gas is not known, the observations in Hennawi et al. (2015), Cantalupo et al. (2014), and Borisova et al. (2016) strongly suggest that the cloudlets are uniformly mixed with a virialized, pressure-supported CGM as is predicted in observations.”