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Title

Two peculiar fast transients in a strongly lensed host galaxy

AuthorsRodney, Steven A.; Balestra, I.; Bradac, Marusa; Brammer, Gabriel; Broadhurst, T.; Caminha, G. B.; Chirivì, G.; Diego, José María ; Filippenko, Alexei V.; Foley, Ryan J.; Graur, Or; Grillo, Claudio; Hemmati, S.; Hjorth, Jens; Hoag, A.; Jauzac, Mathilde; Jha, Saurabh W.; Kawamata, Ryota; Kelly, Patrick L.; McCully, Curtis; Mobasher, B.; Molino, Alberto ; Oguri, Masamune; Richard, Johan; Riess, Adam G.; Rosati, Piero; Schmidt, Kasper B.; Selsing, Jonatan; Sharon, Keren; Strolger, L.G.; Suyu, S.H.; Treu, Tommaso; Weiner, Benjamin J.; Williams, Liliya; Zitrin, Adi
Issue Date2018
PublisherNature Publishing Group
CitationNature Astronomy 2: 324-333 (2018)
AbstractA massive galaxy cluster can serve as a magnifying glass for distant stellar populations, as strong gravitational lensing magnifies background galaxies and exposes details that are otherwise undetectable. In time-domain astronomy, imaging programmes with a short cadence are able to detect rapidly evolving transients, previously unseen by surveys designed for slowly evolving supernovae. Here, we describe two unusual transient events discovered in a Hubble Space Telescope programme that combined these techniques with high-cadence imaging on a field with a strong-lensing galaxy cluster. These transients were faster and fainter than any supernovae, but substantially more luminous than a classical nova. We find that they can be explained as separate eruptions of a luminous blue variable star or a recurrent nova, or as an unrelated pair of stellar microlensing events. To distinguish between these hypotheses will require clarification of the cluster lens models, along with more high-cadence imaging of the field that could detect related transient episodes. This discovery suggests that the intersection of strong lensing with high-cadence transient surveys may be a fruitful path for future astrophysical transient studies.
DescriptionarXiv:1707.02434v1
Publisher version (URL)https://doi.org/10.1038/s41550-018-0405-4
URIhttp://hdl.handle.net/10261/170554
Identifiersdoi: 10.1038/s41550-018-0405-4
e-issn: 2397-3366
Appears in Collections:(IFCA) Artículos
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