Two peculiar fast transients in a strongly lensed host galaxy

Rodney, S. A.; Balestra, I.; Bradac, M.; Brammer, G.; Broadhurst, T.; Caminha, G. B.; Chirivi, G.; Diego, J. M.; Filippenko, A. V.; Foley, R. J.; Graur, O.; Grillo, C.; Hemmati, S.; Hjorth, J.; Hoag, A.; Jauzac, M.; Jha, S. W.; Kawamata, R.; Kelly, P. L.; McCully, C.; Mobasher, B.; Molino, A.; Oguri, M.; Richard, J.; Riess, A. G.; Rosati, P.; Schmidt, K. B.; Selsing, J.; Sharon, K.; Strolger, L. -G.; Suyu, S. H.; Treu, T.; Weiner, B. J.; Williams, L. L. R.; Zitrin, A.

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Autor(es): Mostrar menos -	Rodney, S. A. ^[1] ; Balestra, I. ^[2] ; Bradac, M. ^[3] ; Brammer, G. ^[4] ; Broadhurst, T. ^{[5, 6]} ; Caminha, G. B. ^{[7, 8]} ; Chirivi, G. ^[9] ; Diego, J. M. ^[10] ; Filippenko, A. V. ^{[11, 12]} ; Foley, R. J. ^[13] ; Graur, O. ^{[14, 15, 16]} ; Grillo, C. ^{[17, 18]} ; Hemmati, S. ^[19] ; Hjorth, J. ^[18] ; Hoag, A. ^[3] ; Jauzac, M. ^{[20, 21, 22]} ; Jha, S. W. ^[23] ; Kawamata, R. ^[24] ; Kelly, P. L. ^{[25, 11]} ; McCully, C. ^{[26, 27]} ; Mobasher, B. ^[28] ; Molino, A. ^{[29, 30]} ; Oguri, M. ^{[31, 32, 33]} ; Richard, J. ^[34] ; Riess, A. G. ^{[35, 4]} ; Rosati, P. ^[8] ; Schmidt, K. B. ^{[26, 36]} ; Selsing, J. ^[18] ; Sharon, K. ^[37] ; Strolger, L. -G. ^[4] ; Suyu, S. H. ^{[9, 38, 39]} ; Treu, T. ^[40] ; Weiner, B. J. ^[41] ; Williams, L. L. R. ^[25] ; Zitrin, A. ^[42] Número total de Autores: 35
Afiliação do(s) autor(es): Mostrar menos -	^[1] Univ South Carolina, Dept Phys & Astron, Columbia, SC 29208 - USA ^[2] Univ Observ Munich, Munich - Germany ^[3] Univ Calif Davis, Dept Phys, Davis, CA 95616 - USA ^[4] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 - USA ^[5] Euskal Herriko Unibertsitatea UPV EHU, Fis Teorikoa, Zientzia & Teknol Fak, Leioa - Spain ^[6] Ikerbasque, Basque Fdn Sci, Alameda, CA - Spain ^[7] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen - Netherlands ^[8] Univ Ferrara, Dipartimento Fis & Sci Terra, Ferrara - Italy ^[9] Max Planck Inst Astrophys, Garching - Germany ^[10] Inst Fis Cantabria UC CSIC, IFCA, Santander - Spain ^[11] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 - USA ^[12] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 - USA ^[13] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 - USA ^[14] Amer Museum Nat Hist, Dept Astrophys, New York, NY 10024 - USA ^[15] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 - USA ^[16] NYU, Ctr Cosmol & Particle Phys, New York, NY - USA ^[17] Univ Milan, Dipartimento Fis, Milan - Italy ^[18] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Copenhagen - Denmark ^[19] CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA - USA ^[20] Univ Durham, Dept Phys, Ctr Extragalact Astron, Durham - England ^[21] Univ Durham, Inst Computat Cosmol, Durham - England ^[22] Univ KwaZulu Natal, Sch Math Sci, Astrophys & Cosmol Res Unit, Durban - South Africa ^[23] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ - USA ^[24] Univ Tokyo, Grad Sch Sci, Dept Astron, Tokyo - Japan ^[25] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 - USA ^[26] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 - USA ^[27] Las Cumbres Observ Global Telescope Network, Goleta, CA - USA ^[28] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 - USA ^[29] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo - Brazil ^[30] CSIC, Inst Astrofis Andalucia, Granada - Spain ^[31] Univ Tokyo, Dept Phys, Tokyo - Japan ^[32] Univ Tokyo, Res Ctr Early Universe, Tokyo - Japan ^[33] Univ Tokyo, Kavli Inst Phys & Math Universe Kavli IPMU, WPI, Kashiwa, Chiba - Japan ^[34] Univ Lyon1, Univ Lyon, Ens Lyon, CNRS, Ctr Rech Astrophys Lyon UMR5574, F-69230 St Genis Laval - France ^[35] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 - USA ^[36] Leibniz Inst Astrophys Potsdam AIP, Potsdam - Germany ^[37] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 - USA ^[38] Acad Sinica, Inst Astron & Astrophys, Taipei - Taiwan ^[39] Tech Univ Munich, Phys Dept, Garching - Germany ^[40] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA - USA ^[41] Univ Arizona, Dept Astron, Tucson, AZ - USA ^[42] Ben Gurion Univ Negev, Beer Sheva - Israel Número total de Afiliações: 42
Tipo de documento:	Artigo Científico
Fonte:	NATURE ASTRONOMY; v. 2, n. 4, p. 324-333, APR 2018.
Citações Web of Science:	5
Resumo
A 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. (AU)

Processo FAPESP:	14/11806-9 - Desafios para a nova geração de mapeamentos fotométricos de grande campo como o J-PAS
Beneficiário:	Alberto Molino Benito
Linha de fomento:	Bolsas no Brasil - Pós-Doutorado

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