TY  - JOUR
A1  - Johnson, Sean D.
A1  - Chen, Hsiao-Wen
A1  - Straka, Lorrie
A1  - Schaye, Joop
A1  - Cantalupo, Sebastiano
A1  - Wendt, Martin
A1  - Muzahid, Sowgat
A1  - Bouché, Nicolas
A1  - Herenz, Edmund Christian
A1  - Kollatschny, Wolfram
A1  - Mulchaey, John S.
A1  - Marino, Raffaella A.
A1  - Maseda, Michael
A1  - Wisotzki, Lutz
T1  - Galaxy and quasar fueling caught in the act from the intragroup to the interstellar medium
JF  - The astrophysical journal : Part 2, Letters
N2  - We report the discovery of six spatially extended (10-100 kpc) line-emitting nebulae in the z approximate to 0.57 galaxy group hosting PKS 0405-123, one of the most luminous quasars at z < 1. The discovery is enabled by the Multi Unit Spectroscopic Explorer and provides tantalizing evidence connecting large-scale gas streams with nuclear activity on scales of <10 proper kpc (pkpc). One of the nebulae exhibits a narrow, filamentary morphology extending over 50 pkpc toward the quasar with narrow internal velocity dispersion (50 km s(-1)) and is not associated with any detected galaxies, consistent with a cool intragroup medium filament. Two of the nebulae are 10 pkpc north and south of the quasar with tidal-arm-like morphologies. These two nebulae, along with a continuum-emitting arm extending 60 pkpc from the quasar, are signatures of interactions that are expected to redistribute angular momentum in the host interstellar medium (ISM) to facilitate star formation and quasar fueling in the nucleus. The three remaining nebulae are among the largest and most luminous [O III] emitting "blobs" known (1400-2400 pkpc(2)) and correspond both kinematically and morphologically to interacting galaxy pairs in the quasar host group, consistent with arising from stripped ISM rather than large-scale quasar outflows. The presence of these large- and small-scale nebulae in the vicinity of a luminous quasar bears significantly on the effect of large-scale environment on galaxy and black hole fueling, providing a natural explanation for the previously known correlation between quasar luminosity and cool circumgalactic medium.
KW  - galaxies: interactions
KW  - intergalactic medium
KW  - quasars: general
KW  - quasars: individual (PKS 0405-123)
Y1  - 2018
U6  - https://doi.org/10.3847/2041-8213/aaf1cf
SN  - 2041-8205
SN  - 2041-8213
VL  - 869
IS  - 1
PB  - IOP Publishing Ltd. (Bristol)
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Chen, Hsiao-Wen
A1  - Johnson, Sean D.
A1  - Straka, Lorrie A.
A1  - Zahedy, Fakhri S.
A1  - Schaye, Joop
A1  - Muzahid, Sowgat
A1  - Bouche, Nicolas
A1  - Cantalupo, Sebastiano
A1  - Marino, Raffaella Anna
A1  - Wendt, Martin
T1  - Characterizing circumgalactic gas around massive ellipticals at z approximate to 0.4-III.
BT  - the galactic environment of a chemically pristine Lyman limit absorber
JF  - Monthly notices of the Royal Astronomical Society
N2  - This paper presents a study of the galactic environment of a chemically pristine (<0.6 per cent solar metallicity) Lyman Limit system (LLS) discovered along the sightline towards QSO SDSSJ 135726.27+043541.4 (Z(QSO) = 1.233) at projected distance d = 126 physical kpc (pkpc) from a luminous red galaxy (LRG) at z = 0.33. Combining deep Hubble Space Telescope images, MUSE integral field spectroscopic data, and wide-field redshift survey data has enabled an unprecedented, ultradeep view of the environment around this LRG-LLS pair. A total of 12 galaxies, including the LRG, are found at d less than or similar to 400 pkpc and line-of-sight velocity Delta v < 600 km S-1 of the LLS, with intrinsic luminosity ranging from 0.001 L-* to 2 L-* and a corresponding stellar mass range of M-star approximate to 10(7-11) M-circle dot. All 12 galaxies contribute to a total mass of M-star = 1.6 x 10(11) M-circle dot with approximate to 80 per cent contained in the LRG. The line-of-sight velocity dispersion of these galaxies is found to be sigma (group) = 230 km s(-1) with the centre of mass at d(group) = 118 pkpc and line-of-sight velocity offset of Delta v(group) = 181 km s(-1) from the LLS. Three of these are located at d less than or similar to 100 pkpc from the LLS, and they are all faint with intrinsic luminosity less than or similar to 0.02 L-* and gas-phase metallicity of approximate to 10 per cent solar in their interstellar medium. The disparity in the chemical enrichment level between the LLS and the group members suggests that the LLS originates in infalling intergalactic medium and that parts of the intergalactic gas near old and massive galaxies can still remain chemically pristine through the not too distant past.
KW  - galaxies: elliptical and lenticular, cD
KW  - galaxies: formation
KW  - intergalactic medium
KW  - quasars: absorption lines
Y1  - 2019
U6  - https://doi.org/10.1093/mnras/sty3513
SN  - 0035-8711
SN  - 1365-2966
VL  - 484
IS  - 1
SP  - 431
EP  - 441
PB  - Oxford Univ. Press
CY  - Oxford
ER  -