J/A+A/593/A30 Detection of fast HI outflow in Mrk231 (Morganti+, 2016)
Another piece of the puzzle: the fast HI outflow in Mrk 231.
Morganti R., Veilleux S., Oosterloo T., Teng S.H., Rupke D.
<Astron. Astrophys. 593, A30 (2016)>
=2016A&A...593A..30M 2016A&A...593A..30M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, CCD
Keywords: galaxies: active - galaxies: individual: Mrk 231 -
ISM: jets and outflow - radio lines: galaxies
Abstract:
We present the detection, performed with the Westerbork Synthesis
Radio Telescope (WSRT) and the Karl Jansky Very Large Array (VLA), of
a fast HI 21-cm outflow in the ultra-luminous infrared galaxy Mrk 231.
The outflow is observed as shallow HI absorption blueshifted ∼1300
km/s with respect to the systemic velocity and located against the
inner kpc of the radio source. The outflowing gas has an estimated
column density between 5 and 15x1018Tspin.cm-2. We derive the
Tspin to lie in the range 400-2000 K and the corresponding HI
densities are nHI∼10-100cm-3. We also obtained deeper continuum
images than previously available. They confirm the complex structure
of the radio continuum originating both from the AGN and star
formation. At the resolution obtained with the VLA (∼1-arcsec) we do
not see a kpc-scale jet. Instead, we detect a plateau of emission,
likely due to star formation, surrounding the bright nuclear region.
We also detect a poorly collimated bridge which may represent the
channel feeding the southern lobe. The unprecedented depth of the
low-resolution WSRT image reveals radio emission extending 50-arcsec
(43kpc) to the south and 20arcsec (17kpc) to the north.
Description:
Radio continuum images at 1.4GHz obtained with the Westerbork
Synthesis Radio Telescope (WSRT, see Fig.3 in the paper) and with the
Karl Jansky Very Large Array (VLA, see Fig. 6 in the paper). Summary
of the parameters can be found in Table 1 of the paper. HI absorption
profile, see Fig. 4 in the paper.
Objects:
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RA (2000) DE Designation(s)
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12 56 14.23 +56 52 25.2 Mrk 231 = UGC 8058
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See also:
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig4.dat 43 250 HI absorption profile from the VLA data
list.dat 129 2 Information on fits images
fits/* . 2 Individual fits images
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Byte-by-byte Description of file (#): fig4.dat
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Bytes Format Units Label Explanations
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1- 19 E19.14 km/s V Optical Velocity of the HI
24- 43 E20.14 Jy/beam S Flux of the HI
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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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 50 A21 --- Obs.date Observation date (YYYY-MM-DDThh:mm:ss.s)
52- 58 F7.1 km/s HV Observed heliocentric velocity
60- 63 I4 Kibyte size Size of FITS file
65- 79 A15 --- FileName Name of FITS file, in subdirectory fits
81-129 A49 --- Title Title of the FITS file
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Acknowledgements:
Raffaella Morganti, morganti(at)astron.nl
(End) Raffaella Morganti [ASTRON, NL], Patricia Vannier [CDS] 20-Jun-2016