J/A+A/591/A28 2 QSOs SINFONI K-band datacubes (Carniani+, 2016)
Fast outflows and star formation quenching in quasar host galaxies.
Carniani S., Marconi A., Maiolino R., Balmaverde B., Brusa M.,
Cano-Diaz M., Cicone C., Comastri A., Cresci G., Fiore F., Feruglio C.,
La Franca F., Mainieri V., Mannucci F., Nagao T., Netzer H., Piconcelli E.,
Risaliti G., Schneider R., Shemmer O.
<Astron. Astrophys. 591, A28 (2016)>
=2016A&A...591A..28C 2016A&A...591A..28C (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Infrared sources
Keywords: quasars: emission lines - galaxies: high-redshift - galaxies: active -
galaxies: evolution
Abstract:
Negative feedback from active galactic nuclei (AGN) is considered a
key mechanism in shaping galaxy evolution. Fast, extended outflows are
frequently detected in the AGN host galaxies at all redshifts and
luminosities, both in ionised and molecular gas. However, these
outflows are only potentially able to quench star formation, and we
are still lacking decisive evidence of negative feedback in action.
Here we present observations obtained with the Spectrograph for
INtegral Field Observations in the Near Infrared (SINFONI) H- and
K-band integral-field of two quasars at z∼2.4 that are characterised
by fast, extended outflows detected through the [OIII]λ5007
line. The high signal-to-noise ratio of our observations allows us to
identify faint narrow (FWHM<500km/s) and spatially extended components
in [OIII]λ5007 and Hα emission associated with star
formation in the host galaxy. This star formation powered emission is
spatially anti-correlated with the fast outflows. The ionised outflows
therefore appear to be able to suppress star formation in the region
where the outflow is expanding. However, the detection of narrow
spatially extended Hαemission indicates star formation rates of
at least ∼50-90M_☉/yr, suggesting either that AGN feedback does
not affect the whole galaxy or that many feedback episodes are
required before star formation is completely quenched. On the other
hand, the narrow Hα emission extending along the edges of the
outflow cone may also lead also to a positive feedback interpretation.
Our results highlight the possible double role of galaxy-wide outflows
in host galaxy evolution.
Description:
The two sources LBQS0109 and HB8903 were observed with the SINFONI at
the VLT. Observations from program 091.A-0261(A) (PI A. Marconi) were
executed in seeing-limited mode (≤0.6") with 0.250' spatial scale and
the K-band grating, with a spectral resolution of R=4000 over the
observed wavelength range λ=1.95-2.45nm. The observations of
each target were divided into six 1h long observing blocks (OB) for a
total on-source integration time of four hours (plus overheads).
During each observing block, an ABBA nodding was adopted to perform
sky subtraction.
Objects:
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RA (2000) DE Designation(s)
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01 12 16.9 +02 29 47 LBQS0109 = LBQS 0109+0213
03 31 06.41 -38 24 04.6 HB8903 = [HB93] 0329-385
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 142 2 List of datacubes
fits/* . 2 Individual data cubes
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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- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 29 I4 --- Nz Number of pixels along Z-axis
31- 54 A24 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.ssss)
56- 62 F7.5 0.1nm bWAVE Lower value of wavelenght interval
64- 70 F7.5 0.1nm BWAVE Upper value of wavelenght interval
72- 79 F8.6 0.1nm dWAVE Spectral resolution
81- 85 I5 Kibyte size Size of FITS file
87-101 A15 --- FileName Name of FITS file, in subdirectory fits
103-142 A40 --- Title Title of the FITS file
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Acknowledgements:
Stefano Carniani, carniani(at)arcetri.astro.it
(End) Patricia Vannier [CDS] 06-Jun-2016