Probing the IGM/Galaxy Connection V: On the Origin of Lya and OVI Absorption at z<0.2
作者： J. Xavier Prochaska , J. S. Mulchaey , B. Weiner , K. L. Cooksey , H. W. Chen
DOI: 10.1088/0004-637X/740/2/91
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摘要: We analyze the association of galaxies to Lya and OVI absorption, most commonly detected transitions in low-z intergalactic medium (IGM), fields 14 quasars with z_em = 0.06-0.57. Confirming previous studies, we observe a high covering fraction for absorption impact parameter rho 300kpc: 33/37 our L>0.01L* show equivalent width W_Lya>50mA. Galaxies all luminosity spectral type are surrounded by diffuse ionized circumgalactic (CGM), whose baryonic mass is estimated at ~10^(10.5 +/- 0.3) Msun constant N_H. The virialized halos extended CGM present-day responsible strong absorbers (W_Lya > 300mA) but cannot reproduce majority observed lines forest. conclude that W_Lya=30-300mA occurs cosmic web predicted cosmological simulations estimate characteristic these filaments ~400kpc. Regarding OVI, near unity rho=200kpc L>0.1L* 300kpc sub-L* (0.1 L* 70mA) arise galaxies. Unlike Lya, weaker systems (W_OVI~30mA) gas IGM associated surrounding individual L~0.3L*, rarely originates so-called warm-hot (WHIM) simulations.
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128.84.21.199参考文章(154)
Neta A. Bahcall, Masataka Fukugita, Joop Schaye, Uroš Seljak, Robert H. Lupton, Željko Ivezić, Željko Ivezić, David H. Weinberg, Patrick McDonald, Patrick McDonald, Stephen Kent, Donald P. Schneider, Renyue Cen, David J. Schlegel, David J. Schlegel, James E. Gunn, Daniel E. Vanden Berk, Robert J. Brunner, Scott Burles, David Shih, J. Brinkmann, John W. Briggs, The Lyα Forest Power Spectrum from the Sloan Digital Sky Survey Astrophysical Journal Supplement Series. ,vol. 163, pp. 80- 109 ,(2006) , 10.1086/444361
Jordi Miralda-Escudé, Renyue Cen, Jeremiah P. Ostriker, Michael Rauch, The Lyα Forest from Gravitational Collapse in the Cold Dark Matter + Λ Model The Astrophysical Journal. ,vol. 471, pp. 582- 616 ,(1996) , 10.1086/177992
Jason X. Prochaska, Jason Tumlinson, Baryons: What, When and Where? Astrophys.Space Sci.Proc.. ,vol. 10, pp. 419- 456 ,(2009) , 10.1007/978-1-4020-9457-6_16
Gerard M. Williger, John S. Mulchaey, Benjamin J. Weiner, Jason X. Prochaska, Hsiao-Wen Chen, Probing the IGM-Galaxy Connection Toward PKS0405-123 II : A Cross-Correlation Study of Lya Absorbers and Galaxies at z<0.5 arXiv: Astrophysics. ,(2005) , 10.1086/444377
Lars Hernquist, David H. Weinberg, Neal Katz, Romeel Davé, The Low-Redshift Lyα Forest in Cold Dark Matter Cosmologies The Astrophysical Journal. ,vol. 511, pp. 521- 545 ,(1999) , 10.1086/306722
B. D. Savage, K. R. Sembach, E. B. Jenkins, J. M. Shull, D. G. York, G. Sonneborn, H. W. Moos, S. D. Friedman, J. C. Green, W. R. Oegerle, W. P. Blair, J. W. Kruk, E. M. Murphy, [ITAL]Far Ultraviolet Spectroscopic Explorer[/ITAL] Observations of O [CSC]vi[/CSC] Absorption in the Galactic Halo The Astrophysical Journal. ,vol. 538, pp. L27- L30 ,(2000) , 10.1086/312792
S. L. Morris, R. J. Weymann, Alan Dressler, P. J. McCarthy, B. A. Smith, R. J. Terrile, R. Giovanelli, M. Irwin, The Environment of Lyman a Absorbers in the Sightline toward 3C273 arXiv: Astrophysics. ,(1993) , 10.1086/173505
H. J. Mo, Gaseous Galactic Halos and QSO Absorption Line Systems arXiv: Astrophysics. ,(1997) , 10.1086/177808
Jean-René Gauthier, Hsiao-Wen Chen, Jeremy L. Tinker, THE INCIDENCE OF COOL GAS IN ∼1013 M ☉ HALOS* The Astrophysical Journal. ,vol. 716, pp. 1263- 1268 ,(2010) , 10.1088/0004-637X/716/2/1263
Todd M. Tripp, Blair D. Savage, Edward B. Jenkins, Intervening O [CLC][CSC]vi[/CSC][/CLC] Quasar Absorption Systems at Low Redshift: A Significant Baryon Reservoir The Astrophysical Journal. ,vol. 534, pp. L1- L5 ,(2000) , 10.1086/312644