J/A+A/608/A30 APM 08279+5255 CO(4-3) spectrum (Feruglio+, 2017)
On the discovery of fast molecular gas in the UFO/BAL quasar APM 08279+5255
at z=3.912.
Feruglio C., Ferrara A., Bischetti M., Downes D., Neri R., Ceccarelli C.,
Cicone C., Fiore F., Gallerani S., Maiolino R., Menci N., Piconcelli E.,
Vietri G., Vignali C., Zappacosta L.
<Astron. Astrophys. 608, A30 (2017)>
=2017A&A...608A..30F 2017A&A...608A..30F (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Spectra, millimetric/submm ; Carbon monoxide
Keywords: galaxies: active - quasars: emission lines / submillimeter: ISM -
X-rays: individuals: APM 08279+5255 -
quasars: individual: APM 08279+5255 - quasars: general
Abstract:
We have performed a high sensitivity observation of the UFO/BAL quasar
APM 08279+5255 at z=3.912 with NOEMA at 3.2mm, aimed at detecting
fast moving molecular gas. We report the detection of blueshifted
CO(4-3) with maximum velocity (v95%) of -1340km/s, with respect to
the systemic peak emission, and a luminosity of
L'=9.9x109µ-1K.km/s/pc2, where µ is the lensing
magnification factor. We discuss various scenarios for the nature of
this emission and conclude that this is the first detection of fast
molecular gas at redshift >3. We derived a mass flow rate of molecular
gas in the range dM/dt=3-7.4x103M☉/yr and momentum boost
(dPOF/dt)/(dPAGN/dt)∼2-6, which is therefore consistent with a
momentum conserving flow. For the largest dPOF the scaling is also
consistent with an energy conserving flow with an efficiency of
∼10-20%. The present data can hardly discriminate between the two
expansion modes. The mass loading factor of the molecular outflow
η=(dMOF/dt)/SFR is ≫1. We also detected a molecular emission
line at a frequency of 94.83GHz corresponding to a rest-frame
frequency of 465.8GHz; we tentatively identified this frequency with
the cation molecule N2H+(5-4), which would be the first detection
of this species at high redshift. We discuss the alternative
possibility that this emission is due to a CO emission line from the,
so far undetected, lens galaxy. Further observations of additional
transitions of the same species with NOEMA can discriminate between
the two scenarios.
Description:
NOEMA observations of the CO(4-3) spectral region.
Objects:
-------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------
08 31 41.70 +52 45 17.5 APM 08279 = QSO J0831+5245
-------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
apm-co43.dat 30 90 1D spectrum of the CO(4-3) spectral region
--------------------------------------------------------------------------------
Byte-by-byte Description of file: apm-co43.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.3 km/s Velo Velocity with respect to the observed frame
freq of CO(4-3) peak
15- 20 F6.3 mJy Flux Flux density
26- 30 F5.3 mJy e_Flux Error on flux density
--------------------------------------------------------------------------------
Acknowledgements:
Chiara Feruglio, feruglio(at)oats.inaf.it
(End) Chiara Feruglio [INAF OATs, Italy], Patricia Vannier [CDS] 22-Sep-2017