The extended Lyman-αemission surrounding the z = 3.04 radio-quiet QSO1205-30: Primordial infalling gas illuminated by the quasar?
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The extended Lyman-αemission surrounding the z = 3.04 radio-quiet QSO1205-30 : Primordial infalling gas illuminated by the quasar? / Weidinger, M.; Møller, P.; Fynbo, J. P.U.; Thomsen, B.
In: Astronomy and Astrophysics, Vol. 436, No. 3, 01.06.2005, p. 825-835.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The extended Lyman-αemission surrounding the z = 3.04 radio-quiet QSO1205-30
T2 - Primordial infalling gas illuminated by the quasar?
AU - Weidinger, M.
AU - Møller, P.
AU - Fynbo, J. P.U.
AU - Thomsen, B.
PY - 2005/6/1
Y1 - 2005/6/1
N2 - We present spectroscopic observations obtained with the FORS1 instrument on the ESO VLT under good seeing conditions of the radio-quiet zem = 3.04 quasar Q1205-30 and its associated extended Lyα emission. The extended Lyα emission was originally found in a deep narrow band image targeting a zabs ≈ Zem Lyman-limit system in the spectrum of the QSO. Using spectral point-spread function fitting to subtract the QSO spectrum, we clearly detect the extended Lyα emission as well as two foreground galaxies at small impact parameters (2.12 ± 0.04 and 2.77 ± 0.07 arcsec). The red shifts of the two foreground galaxies are found to be z = 0.4732 and z = 0.865, We determine the redshift and velocity profile for the extended Lyα emission, and analyzing the velocity offsets between eight QSO emission lines we refine the quasar redshift determination. We use the new redshifts to infer the geometry of the complex. We find that the extended Lyα emission is clearly associated with the quasar. A Lyα luminosity of 5.6 × 1043 erg s-1 places this extended emission at the high luminosity end of the few previous detections around radio-quiet quasars. The extended Lyα emission is best explained by hydrogen falling into the dark matter halo inhabited by the quasar.
AB - We present spectroscopic observations obtained with the FORS1 instrument on the ESO VLT under good seeing conditions of the radio-quiet zem = 3.04 quasar Q1205-30 and its associated extended Lyα emission. The extended Lyα emission was originally found in a deep narrow band image targeting a zabs ≈ Zem Lyman-limit system in the spectrum of the QSO. Using spectral point-spread function fitting to subtract the QSO spectrum, we clearly detect the extended Lyα emission as well as two foreground galaxies at small impact parameters (2.12 ± 0.04 and 2.77 ± 0.07 arcsec). The red shifts of the two foreground galaxies are found to be z = 0.4732 and z = 0.865, We determine the redshift and velocity profile for the extended Lyα emission, and analyzing the velocity offsets between eight QSO emission lines we refine the quasar redshift determination. We use the new redshifts to infer the geometry of the complex. We find that the extended Lyα emission is clearly associated with the quasar. A Lyα luminosity of 5.6 × 1043 erg s-1 places this extended emission at the high luminosity end of the few previous detections around radio-quiet quasars. The extended Lyα emission is best explained by hydrogen falling into the dark matter halo inhabited by the quasar.
KW - Galaxies: quasars: absorption lines
KW - Galaxies: quasars: emission lines
KW - Galaxies: quasars: individual: QSO1205-30
KW - Methods: data analysis
UR - http://www.scopus.com/inward/record.url?scp=21244481713&partnerID=8YFLogxK
U2 - 10.1051/0004-6361:20042304
DO - 10.1051/0004-6361:20042304
M3 - Journal article
AN - SCOPUS:21244481713
VL - 436
SP - 825
EP - 835
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
IS - 3
ER -
ID: 243911374