Extragalactic - High-z

Title: ESTIMATION OF MICROLENSING TIME SCALE FOR QUASARS

LENSING EVENTS

Ávila, Felipe

Felipe Ávila Vera(1), Verónica Motta(1), Alejandra Melo(1),Ramses Jerez(1), Juan Magaña

(1) Instituto de Física y Astronomía, Universidad de Valparaíso, Valparaíso, Chile

Abstract: We calculate the time scale occurrence of microlensing events of 187 strong lensed quasars. We use the Einstein radius of each system obtained by a systematic lens modeling process.

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Title: Study of the circumgalactic environment of the merger system J205724.14 at z ∼ 4.6 using ALMA

Fuentealba Fuentes Melissa

Fuentealba Fuentes Melissa, Lira Paulina

Department of Astronomy, Universidad de Chile

Abstract: The merger system J205724.14 at z∼4.6 was discovered by Nguyen et al. (2020) and it is composed of a quasar and a SMG galaxy. We are focusing our study on the extended debris material surrounding the quasar and the relation between this emission and the interaction of the two galaxies in the system. The preliminary results show that the extended emission is straight with a narrow velocity range. It is CII bright and no FIR continuum is detected. Our future work includes to test the possibility of this emission to be a tidal tail from the merger or the accretion of a cold stream from the circum/intergalactic medium.

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Title: A resolved Lyman-alpha profile at z~6.9

Moya-Sierralta,Cristóbal

C. Moya-Sierralta (PUC), J. González-López (LCO,UDP), L.Infante(LCO), L.F Barrientos (PUC)

Abstract: The profile of the Lyman-Alpha (Lya) line can be used to probe the escape mechanisms that allow ionizing radiation to leak into the IGM. To this end, we have begun an spectroscopic campaign to resolve Lya profiles at z~6.9, right at the Epoch of Reionization (EoR).We present new Magellan/FIRE spectroscopy of LAGER-CDFS1, a Lyman-Alpha Emitter (LAE) detected on the LAGER-CDFS field. A spectral line is detected at 𝜆∼9634 𝑛𝑚 consistent with Lya at z~6.9. No other lines are found within the data. The line profile presents a double peak. We compute the escape fraction of Lya and ionizing photons, concluding that CDFS1 is actively ionizing it’s surroundings. However, the small separation between the peaks and the spatial profile suggests that the double peak might not be purely due to radiative transfer effects.

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