2019A&A...626A...9M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:55:36

2019A&A...626A...9M - Astronomy and Astrophysics, volume 626A, 9-9 (2019/6-1)

Obscured AGN at 1.5 < z < 3.0 from the zCOSMOS-deep Survey. I. Properties of the emitting gas in the narrow-line region.

MIGNOLI M., FELTRE A., BONGIORNO A., CALURA F., GILLI R., VIGNALI C., ZAMORANI G., LILLY S.J., LE FEVRE O., BARDELLI S., BOLZONELLA M., BORDOLOI R., LE BRUN V., CAPUTI K.I., CIMATTI A., DIENER C., GARILLI B., KOEKEMOER A.M., MAIER C., MAINIERI V., PENG Y., PEREZ MONTERO E., SILVERMAN J.D. and ZUCCA E.

Abstract (from CDS):


Context. The physics and demographics of high-redshift obscured active galactic nuclei (AGN) is still scarcely investigated. New samples of such objects, selected with different techniques, can provide useful insights into their physical properties.
Aims. With the goal to determine the properties of the gas in the emitting region of type 2 AGN, in particular, the gas metal content, we exploit predictions from photoionization models, including new parameterizations for the distance of gas distribution from the central source and internal microturbulence in the emitting clouds, to interpret rest-frame UV spectral data.
Methods. We selected a sample of 90 obscured (type 2) AGN with 1.45≤z≤3.05 from the zCOSMOS-deep galaxy sample by 5σ detection of the high-ionization CIVλ1549 narrow emission line. This feature in a galaxy spectrum is often associated with nuclear activity, and the selection effectiveness has also been confirmed by diagnostic diagrams based on utraviolet (UV) emission-line ratios. We applied the same selection technique and collected a sample of 102 unobscured (type 1) AGN. Taking advantage of the large amount of multiband data available in the COSMOS field, we investigated the properties of the CIV-selected type 2 AGN, focusing on their host galaxies, X-ray emission, and UV emission lines. Finally, we investigated the physical properties of the ionized gas in the narrow-line region (NLR) of this type 2 AGN sample by combining the analysis of strong UV emission lines with predictions from photoionization models.
Results. We find that in order to successfully reproduce the relative intensity of UV emission lines of the selected high-z type 2 AGN, two new ingredients in the photoionization models are fundamental: small inner radii of the NLR (~=90pc for LAGN=1045erg/s), and the internal dissipative microturbulence of the gas-emitting clouds (with vmicr~=100km/s). With these modified models, we compute the gas-phase metallicity of the NLR, and our measurements indicate a statistically significant evolution of the metal content with redshift. Finally, we do not observe a strong relationship between the NLR gas metallicity and the stellar mass of the host galaxy in our CIV-selected type 2 AGN sample.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: active - galaxies: fundamental parameters - galaxies: evolution - quasars: emission lines - X-rays: galaxies - line: formation

VizieR on-line data: <Available at CDS (J/A+A/626/A9): sample.dat fits/*>

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 1

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Number of rows : 1

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 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2066 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:55:36

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NAME COSMOS Field -- Region defined in the sky
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  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
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    position angle (in degrees North celestial pole to East)
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    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
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ICRS coord. (ep=J2000) :
10 00 28.60 +02 12 21.0 [ ] D 2007ApJS..172..523M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
09 57 53.49 +02 26 47.2 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
236.82224 +42.12163 [ ]
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References (2066 between 1850 and 2020) (Total 2066)
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2020.07.08-03:55:36

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