J/A+A/636/A37 High-z AGN obscured by host galaxy ISM (D'Amato+, 2020)
Dust and gas content of high-redshift galaxies hosting obscured AGN
in the Chadra Deep Field-South. .
D'Amato Q., Gilli R., Vignali C., Massardi M., Pozzi F., Zamorani G.,
Circosta C., Vito F., Fritz J., Cresci G., Casasola V., Calura F.,
Feltre A., Manieri V, Rigopoulou D., Tozzi P., Norman C.
<Astron. Astrophys. 636, A37 (2020)>
=2020A&A...636A..37D 2020A&A...636A..37D (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Millimetric/submm sources
Keywords: galaxies: active - galaxies: evolution - galaxies: high-redshift -
submillimeter: galaxies - ISM: structure -
ISM: kinematics and dynamics
Abstract:
Submillimeter Galaxies (SMGs) at high redshift are among the best
targets to investigate the early evolutionary phases in the lifetime
of massive systems, during which large gas reservoirs sustain vigorous
star formation and efficiently feed the central, buried Super Massive
Black Hole (SMBH). We present the analysis of new ALMA band 4
(1.8-2.4mm) continuum and high-J CO observation of six obscured QSOs
(logNH>23) hosted by SMGs at z>2.5 in the 7 Ms Chandra Deep Field
South (CDF-S). Sizes and masses of the galaxies are measured to
estimate to which extent the host ISM may contribute to the nuclear
absorption. We found that at high redshift the galaxy ISM can
substantially contribute to the AGN obscuration up to the
Compton-thick (1024cm-2) regime. In addition, we found that all
the detected sources show a velocity gradient possibly ascribed to a
rotating system, even though two of them could be even associated with
a chaotic, possibly merging, structure.
Description:
We performed ALMA observations (Cycle 4, Band 4, ID: 2015.1.01205.S,
PI: R. Gilli) of the continuum at 2.1mm (142.78GHz) and of one
high-J CO transition for each of the targets
The observations were split in two blocks, each containing three
targets: the 2x4GHz spectral windows (spws) cover the range
126.56-130.33GHz and 138.56-142.33GHz to observe XID 666, XID 746 and
XID 539, and the range 133.07-136.93GHz and 145.17-148.93 Hz for XID
42, XID 337 and XID 551.
Objects:
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RA (ICRS) DE Designation(s)
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03 31 51.94 -27 53 27.2 XID 42 = [LBX2017] 42
03 32 18.83 -27 51 35.5 XID 337 = [LBX2017] 337
03 32 29.29 -27 56 19.5 XID 539 = [LBX2017] 539
03 32 29.85 -27 51 05.9 XID 551 = [LBX2017] 551
03 32 35.71 -27 49 16.0 XID 666 = [LBX2017] 666
03 32 39.67 -27 48 50.6 XID 746 = [LBX2017] 746
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 134 12 List of fits images and datacubes
fits/* . 12 Individual fits images and datacubes
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See also:
J/ApJS/228/2 : Chandra Deep Field-South survey: 7Ms sources (Luo+, 2017)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz ? Number of slices for the datacubes
32- 57 A26 "datime" Obs.date Observation date
59- 65 F7.3 GHz Freq ? Observed frequency
67- 75 F9.3 km/s bVRAD ? Radial velocity or
lower value of radial velocity interval
77- 85 F9.4 km/s BVRAD ? Upper value of radial velocity interval
87- 89 I3 km/s dVRAD ? Radial velocity resolution
91- 96 I6 Kibyte size Size of FITS file
98-113 A16 --- FileName Name of FITS file, in subdirectory fits
115-134 A20 --- Title Title of the FITS file
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Acknowledgements:
Quirino D'Amato, quirino.damato(at)gmail.com
(End) Patricia Vannier [CDS] 23-Mar-2020