2019A&A...628L...6V


Query : 2019A&A...628L...6V

2019A&A...628L...6V - Astronomy and Astrophysics, volume 628, L6-6 (2019/8-1)

Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair.

VITO F., BRANDT W.N., BAUER F.E., GILLI R., LUO B., ZAMORANI G., CALURA F., COMASTRI A., MAZZUCCHELLI C., MIGNOLI M., NANNI R., SHEMMER O., VIGNALI C., BRUSA M., CAPPELLUTI N., CIVANO F. and VOLONTERI M.

Abstract (from CDS):

While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for selecting z>6 quasars (QSOs) are strongly biased against obscured QSOs, thus considerably limiting our understanding of accreting SMBHs during the first gigayear of the Universe from an observational point of view. We report the Chandra discovery of the first heavily obscured QSO candidate in the early universe, hosted by a close (~=5kpc) galaxy pair at z=6.515. One of the members is an optically classified type-1 QSO, PSO167-13. The companion galaxy was first detected as a [CII] emitter by Atacama large millimeter array (ALMA). An X-ray source is significantly (P=0.9996) detected by Chandra in the 2-5keV band, with <1.14 net counts in the 0.5-2keV band, although the current positional uncertainty does not allow a conclusive association with either PSO167-13 or its companion galaxy. From X-ray photometry and hardness-ratio arguments, we estimated an obscuring column density of NH>2x1024cm–2 and NH>6x1023cm–2 at 68% and 90% confidence levels, respectively. Thus, regardless of which of the two galaxies is associated with the X-ray emission, this source is the first heavily obscured QSO candidate at z>6.

Abstract Copyright: © ESO 2019

Journal keyword(s): early Universe - galaxies: high-redshift - methods: observational - galaxies: individual: J167.6415-13.4960 - galaxies: active - X-rays: individuals: J167.6415-13.4960

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2093 1
2 ALESS J033229.29-275619.7 QSO 03 32 29.2912 -27 56 19.465     26.76 25.82 25.1655 ~ 111 0
3 SDSS J103027.09+052455.0 QSO 10 30 27.092 +05 24 55.02   26.15 25.44     ~ 269 0
4 PSO J167.6415-13.4960 QSO 11 10 33.963 -13 29 45.73           ~ 37 0
5 QSO J1342+0928 QSO 13 42 08.100 +09 28 38.36           ~ 116 0

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