Browsing by Author "Saez, C."

Now showing 1 - 9 of 9
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    An extragalactic spectroscopic survey of the SSA22 field
    (2015) Saez, C.; Lehmer, B. D.; Bauer, Franz Erik; Stern, D.; Gonzales, A.; Rreza, I.; Alexander, D. M.; Matsuda, Y.; Geach, J. E.; Harrison, F. A.
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    Independent Anti-Angiogenic Capacities of Coagulation Factors X and Xa
    (2014) Lange, S.; Gonzalez, I.; Pinto, M.; Arce, M.; Valenzuela Bassi, Rodrigo Andrés; Aranda, E.; Elliot, M.; Alvarez, M.; Henriquez, S.; Velasquez, Ever A.; Orge, F.; Oliva, B.; Gonzalez, P.; Villalón, Manuel J.; Cautivo Reyes, Kelly Margarita; Kalergis Parra, Alexis Mikes; Pereira, K.; Mendoza, C.; Saez, C.; Kato Cardemil, Sumie Rode; Cuello F., Mauricio; Parborell, F.; Irusta, G.; Palma, V.; Allende, M.; Owen, Gareth Ivor
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    MULTI-SIGHTLINE OBSERVATION OF NARROW ABSORPTION LINES IN LENSED QUASAR SDSS J1029+2623
    (2016) Misawa, T.; Saez, C.; Charlton, J.; Eracleous, M.; Chartas, G.; Bauer, Franz Erik; Inada, N.; Uchiyama, H.
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    Older adults with frailty syndrome present an altered platelet function and an increased level of circulating oxidative stress and mitochondrial dysfunction biomarker GDF-15
    (2020) Arauna, D.; Garcia, F.; Rodriguez-Manas, L.; Marrugat, J.; Saez, C.; Alarcon, M.; Wehinger, S.; Espinosa-Parrilla, Y.; Palomo, I.; Fuentes, E.
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    Performance evaluation of paediatric propofol pharmacokinetic models in healthy young children
    (OXFORD UNIV PRESS, 2011) Sepulveda, P.; Cortinez, L. I.; Saez, C.; Penna, A.; Solari, S.; Guerra, I.; Absalom, A. R.
    Background. The performance of eight currently available paediatric propofol pharmacokinetic models in target-controlled infusions (TCIs) was assessed, in healthy children from 3 to 26 months of age.
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    THE NuSTAR EXTRAGALACTIC SURVEY: A FIRST SENSITIVE LOOK AT THE HIGH-ENERGY COSMIC X-RAY BACKGROUND POPULATION
    (2013) Alexander, D. M.; Stern, D.; Del Moro, A.; Lansbury, G. B.; Assef, R. J.; Aird, J.; Ajello, M.; Ballantyne, D. R.; Bauer, F. E.; Boggs, S. E.; Brandt, W. N.; Christensen, F. E.; Civano, F.; Comastri, A.; Craig, W. W.; Elvis, M.; Grefenstette, B. W.; Hailey, C. J.; Harrison, F. A.; Hickox, R. C.; Luo, B.; Madsen, K. K.; Mullaney, J. R.; Perri, M.; Puccetti, S.; Saez, C.; Treister, E.; Urry, C. M.; Zhang, W. W.; Bridge, C. R.; Eisenhardt, P. R. M.; Gonzalez, A. H.; Miller, S. H.; Tsai, C. W.
    We report on the first 10 identifications of sources serendipitously detected by the Nuclear Spectroscopic Telescope Array (NuSTAR) to provide the first sensitive census of the cosmic X-ray background source population at greater than or similar to 10 keV. We find that these NuSTAR-detected sources are approximate to 100 times fainter than those previously detected at greater than or similar to 10 keV and have a broad range in redshift and luminosity (z = 0.020-2.923 and L10-40 keV approximate to 4 x 10(41)-5 x 10(45) erg s(-1)); the median redshift and luminosity are z approximate to 0.7 and L10-40 keV approximate to 3 x 10(44) erg s(-1), respectively. We characterize these sources on the basis of broad-band approximate to 0.5-32 keV spectroscopy, optical spectroscopy, and broad-band ultraviolet-to-mid-infrared spectral energy distribution analyses. We find that the dominant source population is quasars with L10-40 keV > 10(44) erg s(-1), of which approximate to 50% are obscured with N-H greater than or similar to 10(22) cm(-2). However, none of the 10 NuSTAR sources are Compton thick (N-H greater than or similar to 10(24) cm(-2)) and we place a 90% confidence upper limit on the fraction of Compton-thick quasars (L10-40 keV > 10(44) erg s(-1)) selected at greater than or similar to 10 keV of less than or similar to 33% over the redshift range z = 0.5-1.1. We jointly fitted the rest-frame approximate to 10-40 keV data for all of the non-beamed sources with L10-40 keV > 10(43) erg s(-1) to constrain the average strength of reflection; we find R < 1.4 for Gamma = 1.8, broadly consistent with that found for local active galactic nuclei (AGNs) observed at greater than or similar to 10 keV. We also constrain the host-galaxy masses and find a median stellar mass of approximate to 10(11) M-circle dot, a factor approximate to 5 times higher than the median stellar mass of nearby high-energy selected AGNs, which may be at least partially driven by the order of magnitude higher X-ray luminosities of the NuSTAR sources. Within the low source-statistic limitations of our study, our results suggest that the overall properties of the NuSTAR sources are broadly similar to those of nearby high-energy selected AGNs but scaled up in luminosity and mass.
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    The long-term X-ray variability of broad absorption line quasars
    (2012) Saez, C.; Bauer, Franz Erik
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    The Nustar Extragalactic Surveys: Overview and Catalog from the COSMOS Field
    (2015) Civano, Francesca; Bauer, Franz Erik; Luo, B.; Saez, C.; Treister, Ezequiel; Hickox, R. C.; Puccetti, S.; Comastri, A.; Mullaney, J.; Zappacosta, L.; LaMassa, Stephanie M.
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    The X-rays wind connection in PG 2112+059
    (2021) Saez, C.; Brandt, W. N.; Bauer, F. E.; Chartas, G.; Misawa, T.; Hamann, F.; Gallagher, S. C.
    We study the connection between the X-ray and ultraviolet (UV) properties of the broad absorption line (BAL) wind in the highly X-ray variable quasar PG 2112+059 by comparing Chandra-ACIS data with contemporaneous UV HST/STIS spectra in three different epochs. We observe a correlation whereby an increase in the equivalent widths (EWs) of the BALs is accompanied by a redder UV spectrum. The growth in the BAL EWs is also accompanied by a significant dimming in soft X-ray emission (less than or similar to 2keV), consistent with increased absorption. Variations in the hard X-ray emission (less than or similar to 2 keV) are only accompanied by minor spectral variations of the UV-BALs and do not show significant changes in the EWof BALs. These trends suggest a wind-shield scenario where the outflow inclination with respect to the line of sight is decreasing and/or the wind mass is increasing. These changes elevate the covering fraction and/or column densities of the BALs and are likely accompanied by a nearly contemporaneous increase in the column density of the shield.