2015A&A...578A.120L


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.18CET00:42:42

2015A&A...578A.120L - Astronomy and Astrophysics, volume 578A, 120-120 (2015/6-1)

The most obscured AGN in the COSMOS field.

LANZUISI G., PERNA M., DELVECCHIO I., BERTA S., BRUSA M., CAPPELLUTI N., COMASTRI A., GILLI R., GRUPPIONI C., MIGNOLI M., POZZI F., VIETRI G., VIGNALI C. and ZAMORANI G.

Abstract (from CDS):

Highly obscured active galactic nuclei (AGN) are common in nearby galaxies, but are difficult to observe beyond the local Universe, where they are expected to significantly contribute to the black hole accretion rate density. Furthermore, Compton-thick (CT) absorbers (NH>1024cm–2) suppress even the hard X-ray (2-10keV) AGN nuclear emission, and therefore the column density distribution above 1024cm–2 is largely unknown. We present the identification and multi-wavelength properties of a heavily obscured (NH>1025cm–2), intrinsically luminous (L2–10>1044erg/s) AGN at z=0.353 in the COSMOS field. Several independent indicators, such as the shape of the X-ray spectrum, the decomposition of the spectral energy distribution and X-ray/[NeV] and X-ray/6µm luminosity ratios, agree on the fact that the nuclear emission must be suppressed by a>1025cm–2 column density. The host galaxy properties show that this highly obscured AGN is hosted in a massive star-forming galaxy, showing a barred morphology, which is known to correlate with the presence of CT absorbers. Finally, asymmetric and blueshifted components in several optical high-ionization emission lines indicate the presence of a galactic outflow, possibly driven by the intense AGN activity (LBol/LEdd=0.3-0.5). Such highly obscured, highly accreting AGN are intrinsically very rare at low redshift, whereas they are expected to be much more common at the peak of the star formation and BH accretion history, at z∼2-3. We demonstrate that a fully multi-wavelength approach can recover a sizable sample of such peculiar sources in large and deep surveys such as COSMOS.

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Journal keyword(s): galaxies: active - galaxies: nuclei - X-rays: galaxies

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 3992 2
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1753 1
3 3XMM J095910.3+020731 QSO 09 59 10.3132759295 +02 07 32.242838926 21.59 20.73 20.00     ~ 33 0
4 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 1894 0
5 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 601 0
6 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2625 4

    Equat.    Gal    SGal    Ecl

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2019.11.18-00:42:42

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