Paulina Lira

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Although the numbers of known quasars and active galactic nuclei (AGN) have grown considerably in the past decade, a vast amount of discovery space remains to be explored with much larger and deeper samples. LSST will revolutionize our understanding of the growth of supermassive black holes with cosmic time, AGN fueling mechanisms, the detailed physics of(More)
We develop a method for estimating the host galaxy dust extinction for type Ia supernovae based on an observational coincidence first noted by Lira (1995), who found that the B − V evolution during the period from 30–90 days after V maximum is remarkably similar for all events, regardless of light curve shape. This fact is used to calibrate the dependence(More)
We describe the results of an extremely deep, 0.28 deg survey for z = 3.1 Lyα emission-line galaxies in the Extended Chandra Deep Field South. By using a narrow-band 5000 Å filter and complementary broadband photometry from the MUSYC survey, we identify a statistically complete sample of 162 galaxies with monochromatic fluxes brighter than 1.5×10 ergs cm s(More)
We present first results of a spectroscopic survey targeting K-selected galaxies at z = 2.0 − 2.7 using the GNIRS instrument on Gemini-South. We obtained near-infrared spectra with a wavelength coverage of 1.0–2.5 μm for 26 K-bright galaxies (K < 19.7) selected from the MUSYC survey using photometric redshifts. We successfully derived spectroscopic(More)
We present a family of six BVI template light curves for SNe Ia for days -5 and +80, based on high-quality data gathered at CTIO. These templates display a wide range of light curve morphologies, with initial decline rates of their B light curves between ∆m15(B)=0.87 m and 1.93. We use these templates to study the general morphology of SNe Ia light curves.(More)
We present simultaneous X-ray and optical B and V band light curves of the Seyfert Galaxy NGC 3783 spanning 2 years. The flux in all bands is highly variable and the fluctuations are significantly correlated. As shown before by Stirpe et al. the optical bands vary simultaneously, with a delay of less than 1.5 days but both B and V bands lag the X-ray(More)
Using the Gemini Near-InfraRed Spectrograph (GNIRS), we have completed a near-infrared spectroscopic survey for K-bright galaxies at z ∼ 2.3, selected from the MUSYC survey. We derived spectroscopic redshifts from emission lines or from continuum features and shapes for all 36 observed galaxies. The continuum redshifts are driven by the Balmer/4000 Å break,(More)
We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6181 unique X-ray sources are significantly detected with XMM-Newton (>5σ) and Chandra (>4.5σ). This catalog release includes data from XMM-Newton cycle AO 13, which(More)
The advanced capabilities of the Chandra and XMMNewton observatories mean that, for the first time, the detailed study of the brightest point-like X-ray sources in nearby galaxies outside of the local group is a realistic aim. Here, we present the results of a Chandra ACIS-S study of two of the nearest and brightest sources in the rare ultraluminous (LX >(More)
Based on recent results on the frequency of Mg II absorption-line systems in the spectra of QSO behind RCS clusters (QbC), we analyse the effects of the cluster environment on the sizes of baryonic haloes around galaxies. We use two independent models: (i) an empirical halo occupation model which fits current measurements of the clustering and luminosity(More)