Browsing by Subject "Quasars: absorption lines"

Now showing items 1-12 of 12

    • A VLT/MUSE galaxy survey towards QSO Q1410: looking for a WHIM traced by BLAs in inter-cluster filaments 
      Pessa, Ismael; Tejos, Nicolás; Barrientos, Luis; Werk, Jessica; Bielby, Richard; Padilla, Nelson; Morris, Simón; Prochaska, J.; López Morales, Sebastián; Hummels, Cameron (Oxford University Press, 2018)
      Cosmological simulations predict that a significant fraction of the low-z baryon budget resides in large-scale filaments in the form of a diffuse plasma at temperatures T similar to 10(5)-10(7) K. However, direct observation ...
    • A coronagraphic absorbing cloud reveals the narrow-line region and extended Lyman alpha emission of QSO J0823+0529 
      Fathivavsari, H.; Petitjean, P.; Noterdaeme, P.; Paris, I.; Finley, H.; López Morales, Sebastián; Srianand, R.; Sánchez, P. S. (Oxford Univ Press, 2015)
      We report long-slit spectroscopic observations of the quasar SDSS J082303.22+052907.6 (z(C IV) similar to 3.1875), whose broad-line region (BLR) is partly eclipsed by a strong damped Lyman alpha (DLA; logN(H I) = 21.7) ...
    • A coronagraphic absorbing cloud reveals the narrow-line region and extended Lyman α emission of QSO J0823+0529 
      Fathivavsari, H.; Petitjean, P.; Noterdaeme, P.; Paris, I.; Finley, H.; López Morales, Sebastián; Srianand, R.; Sánchez, Paula (Royal Astronomical Society, 2015)
      We report long-slit spectroscopic observations of the quasar SDSS J082303.22+052907.6 (zC IV ∼ 3.1875), whose broad-line region (BLR) is partly eclipsed by a strong damped Lyman α (DLA; logN(H I) = 21.7) cloud. This ...
    • H-2 molecular gas absorption-selected systems trace CO molecular gas-rich galaxy overdensities 
      Klitsch, Anne; Peroux, Celine; Zwaan, Martin A.; De Cia, Annalisa; Ledoux, Cedric; López Morales, Sebastián Víctor Claudio (Oxford, 2021)
      Absorption-selected galaxies offer an effective way to study low-mass galaxies at high redshift. However, the physical properties of the underlying galaxy population remain uncertain. In particular, the multiphase ...
    • On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4 
      Berg, T. A. M.; Ellison, S. L.; Prochaska, J. X.; Sánchez Ramírez, R.; López Morales, Sebastián; D'Odorico, V.; Becker, G.; Christensen, L.; Cupani, G.; Denney, K.; Worseck, G. (Oxford University Press, 2017-01)
      The XQ-100 survey provides optical and near-infrared coverage of 36 blindly selected, intervening damped Lyman alpha systems (DLAs) at 2 < z(abs) < 4, simultaneously covering the MgII doublet at lambda lambda 2796, 2803 ...
    • Sharpening quasar absorption lines with ESPRESSO? Temperature of warm gas at z ~2, constraints on the Mg ... 
      Noterdaeme, Pasquier; Balashev, S.; Ledoux, C.; Duchoquet, G.; López Morales, Sebastián; Telikova, K.; Boissé, P.; Krogager, J. K.; De Cia, A.; Bergeron, J. (EDP Sciences, 2021)
      Aims. We aim to study several key physical properties of quasar absorption-line systems that are subtly encoded in their absorption profiles and have not yet been thoroughly investigated or constrained.Methods. We analysed ...
    • Spotting high-z molecular absorbers using neutral carbon Results from a complete spectroscopic survey with the VLT 
      Noterdaeme, P.; Ledoux, C.; Petitjean, P.; Srianand, R.; Balashev, S.; Lopez, S.; Zou, S. (EDP Sciences S A, 2018)
      While molecular quasar absorption systems provide unique probes of the physical and chemical properties of the gas as well as original constraints on fundamental physics and cosmology, their detection remains challenging. ...
    • The cosmic ultraviolet baryon survey (CUBS) - III. Physical properties and elemental abundances of Lyman-limit ... 
      Zahedy, Fakhri S.; Chen, Hsiao-Wen; Cooper, Thomas M.; Boettcher, Erin; Johnson, Sean D.; Rudie, Gwen C.; Chen, Mandy C.; Cantalupo, Sebastiano; Cooksey, Kathy L.; Faucher Giguere, Claude-Andre; Greene, Jenny E.; López Morales, Sebastián Víctor Claudio; Mulchaey, John S.; Penton, Steven; Petitjean, Patrick; Putman, Mary E.; Rafelski, Marc; Rauch, Michael; Schaye, Joop; Simcoe, Robert A.; Walth, Gregory L. (Oxford, 2021)
      We present a systematic investigation of physical conditions and elemental abundances in four optically thick Lyman-limit systems (LLSs) at z = 0.36-0.6 discovered within the cosmic ultraviolet baryon survey (CUBS). Because ...
    • The cosmic ultraviolet baryon survey (CUBS) IV: The complex multiphase circumgalactic medium as revealed ... 
      Cooper, Thomas J.; Rudie, Gwen C.; Chen, Hsiao-Wen; Johnson, Sean D.; Zahedy, Fakhri S.; Chen, Mandy C.; Boettcher, Erin; Walth, Gregory L.; Cantalupo, Sebastiano; Cooksey, Kathy L.; Faucher Giguere, Claude Andre; Greene, Jenny E.; López Morales, Sebastián Víctor Claudio; Mulchaey, John S.; Penton, Steven; Petitjean, Patrick; Putman, Mary E.; Rafelski, Marc; Rauch, Michael; Schaye, Joop; Simcoe, Robert A. (Oxford, 2021)
      We present a detailed study of two partial Lyman limit systems (pLLSs) of neutral hydrogen column density N-HI approximate to ( 1 - 3) x 10(16) cm(-2 )discovered at z = 0.5 in the Cosmic Ultraviolet Baryon Survey (CUBS). ...
    • The Cosmic Ultraviolet Baryon Survey (CUBS) – I. Overview and the diverse environments of Lyman limit systems ... 
      Chen, Hsiao-Wen; Zahedy, Fakhri S.; Boettcher, Erin; Cooper, Thomas M.; Johnson, Sean D.; Rudie, Gwen C.; Chen, Mandy C.; Walth, Gregory L.; Cantalupo, Sebastiano; Cooksey, Kathy L.; Faucher-Giguère, Claude-André; Greene, Jenny E.; López Morales, Sebastián; Mulchaey, John S.; Penton, Steven V.; Petitjean, Patrick; Putman, Mary E.; Rafelski, Marc; Rauch, Michael; Schaye, Joop; Simcoe, Robert A.; Weiner, Benjamin J. (Oxford University Press, 2020)
      We present initial results from the Cosmic Ultraviolet Baryon Survey (CUBS). CUBS is designed to map diffuse baryonic structures at redshift z less than or similar to 1 using absorption-line spectroscopy of 15 UV-bright ...
    • The evolution of the Si IV content in the Universe from the epoch of reionization to cosmic noon 
      D'Odorico, V.; Finlator, K.; Cristiani, S.; Cupani, G.; Perrotta, S.; Calura, F.; Centurion, M.; Becker, G.; Berg, T. A. M.; López, S.; Ellison, S.; Pomante, E. (Oxford, 2022)
      We investigate the abundance and distribution of metals in the high-redshift intergalactic medium and circum-galactic medium through the analysis of a sample of almost 600 Si iv absorption lines detected in high and ...
    • The X-rays wind connection in PG 2112+059 
      Sáez, C.; Brandt, W. N.; Bauer, F. E.; Chartas, G.; Misawa, T.; Hamann, F.; Gallagher, S. C. (Oxford, 2021)
      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 ...