FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2617932787> ?p ?o ?g. }

• W2617932787 endingPage "2910" @default.
• W2617932787 startingPage "2890" @default.
• W2617932787 abstract "We present a detailed analysis of a H$_2$-rich, extremely strong intervening Damped Ly-$alpha$ Absorption system (DLA) at $z_{rm abs}=2.786$ towards the quasar J$,$0843+0221, observed with the Ultraviolet and Visual Echelle Spectrograph on the Very Large Telescope. The total column density of molecular (resp. atomic) hydrogen is $log N$(H$_2$)=$21.21pm0.02$ (resp. $log N$(H$,$I)=$21.82pm0.11$), making it to be the first case in quasar absorption lines studies with H$_2$ column density as high as what is seen in $^{13}$CO-selected clouds in the Milky-Way. We find that this system has one of the lowest metallicity detected among H$_2$-bearing DLAs, with $rm [Zn/H]=-1.52^{+0.08}_{-0.10}$. This can be the reason for the marked differences compared to systems with similar H$_2$ column densities in the local Universe: $(i)$ the kinetic temperature, $Tsim$120~K, derived from the $J=0,1$ H$_2$ rotational levels is at least twice higher than expected; $(ii)$ there is little dust extinction with A$_V < 0.1$; $(iii)$ no CO molecules are detected, putting a constraint on the $X_{rm CO}$ factor $X_{rm CO}> 2times 10^{23} $ cm$^{-2}$/(km/s,K), in the very low metallicity gas. Low CO and high H$_2$ contents indicate that this system represents CO-dark/faint gas. We investigate the physical conditions in the H$_2$-bearing gas using the fine-structure levels of C$,$I, C$,$II, Si$,$II and the rotational levels of HD and H$_2$. We find the number density to be about $n sim 260-380,$cm$^{-3}$, implying a high thermal pressure of $(3-5) times 10^4,$cm$^{-3},$K. We further identify a trend of increasing pressure with increasing total hydrogen column density. This independently supports the suggestion that extremely strong DLAs (with $log,$N(H) $sim 22$) probe high-z galaxies at low impact parameters." @default.
• W2617932787 created "2017-06-05" @default.
• W2617932787 creator A5007052267 @default.
• W2617932787 creator A5013460061 @default.
• W2617932787 creator A5028144052 @default.
• W2617932787 creator A5045764813 @default.
• W2617932787 creator A5050952440 @default.
• W2617932787 creator A5062770672 @default.
• W2617932787 creator A5084059584 @default.
• W2617932787 creator A5086325066 @default.
• W2617932787 creator A5087354351 @default.
• W2617932787 date "2017-05-31" @default.
• W2617932787 modified "2023-09-30" @default.
• W2617932787 title "CO-dark molecular gas at high redshift: very large H2 content and high pressure in a low-metallicity damped Lyman alpha system" @default.
• W2617932787 cites W1501582143 @default.
• W2617932787 cites W1520435229 @default.
• W2617932787 cites W1561160156 @default.
• W2617932787 cites W1653633141 @default.
• W2617932787 cites W1801588363 @default.
• W2617932787 cites W1897009212 @default.
• W2617932787 cites W1907514996 @default.
• W2617932787 cites W1960811163 @default.
• W2617932787 cites W1966160261 @default.
• W2617932787 cites W1971761780 @default.
• W2617932787 cites W1973412110 @default.
• W2617932787 cites W1973913139 @default.
• W2617932787 cites W1981138880 @default.
• W2617932787 cites W1982866230 @default.
• W2617932787 cites W1984072856 @default.
• W2617932787 cites W1986345694 @default.
• W2617932787 cites W1996459846 @default.
• W2617932787 cites W1997428607 @default.
• W2617932787 cites W1998982140 @default.
• W2617932787 cites W2004052728 @default.
• W2617932787 cites W2006703260 @default.
• W2617932787 cites W2006878995 @default.
• W2617932787 cites W2008076656 @default.
• W2617932787 cites W2009467479 @default.
• W2617932787 cites W2011646311 @default.
• W2617932787 cites W2014555677 @default.
• W2617932787 cites W2017537421 @default.
• W2617932787 cites W2026931508 @default.
• W2617932787 cites W2028314636 @default.
• W2617932787 cites W2028680388 @default.
• W2617932787 cites W2030873793 @default.
• W2617932787 cites W2032325755 @default.
• W2617932787 cites W2032365236 @default.
• W2617932787 cites W2033011053 @default.
• W2617932787 cites W2037243135 @default.
• W2617932787 cites W2040615387 @default.
• W2617932787 cites W2046335871 @default.
• W2617932787 cites W2048815880 @default.
• W2617932787 cites W2050326264 @default.
• W2617932787 cites W2052629426 @default.
• W2617932787 cites W2054872331 @default.
• W2617932787 cites W2056634643 @default.
• W2617932787 cites W2058731249 @default.
• W2617932787 cites W2061871967 @default.
• W2617932787 cites W2065246518 @default.
• W2617932787 cites W2065520296 @default.
• W2617932787 cites W2066382349 @default.
• W2617932787 cites W2069524830 @default.
• W2617932787 cites W2070774710 @default.
• W2617932787 cites W2074040676 @default.
• W2617932787 cites W2075770183 @default.
• W2617932787 cites W2076132585 @default.
• W2617932787 cites W2079991755 @default.
• W2617932787 cites W2080029870 @default.
• W2617932787 cites W2083740407 @default.
• W2617932787 cites W2085730108 @default.
• W2617932787 cites W2089953649 @default.
• W2617932787 cites W2091630436 @default.
• W2617932787 cites W2093835827 @default.
• W2617932787 cites W2097292025 @default.
• W2617932787 cites W2098482824 @default.
• W2617932787 cites W2099237632 @default.
• W2617932787 cites W2101687185 @default.
• W2617932787 cites W2112028701 @default.
• W2617932787 cites W2118190921 @default.
• W2617932787 cites W2128294460 @default.
• W2617932787 cites W2128764080 @default.
• W2617932787 cites W2132463704 @default.
• W2617932787 cites W2133416593 @default.
• W2617932787 cites W2139214910 @default.
• W2617932787 cites W2139937287 @default.
• W2617932787 cites W2140347367 @default.
• W2617932787 cites W2145564326 @default.
• W2617932787 cites W2150976064 @default.
• W2617932787 cites W2155421027 @default.
• W2617932787 cites W2157473440 @default.
• W2617932787 cites W2157917411 @default.
• W2617932787 cites W2158091684 @default.
• W2617932787 cites W2159264410 @default.
• W2617932787 cites W2160325921 @default.
• W2617932787 cites W2160982006 @default.
• W2617932787 cites W2162680201 @default.
• W2617932787 cites W2164234922 @default.
• W2617932787 cites W2170122842 @default.

• next