J/A+A/600/A87 IRAS17020+4544 VLBA 5, 8, 15, 24GHz images (Giroletti+, 2017)
Coexistence of a non thermal jet and a complex ultra fast X-ray outflow in a
moderately luminous AGN.
Giroletti M., Panessa F., Longinotti A.L., Krongold Y., Guainazzi M.,
Costantini E., Santos-Lleo M.
<Astron. Astrophys. 600, A87 (2017)>
=2017A&A...600A..87G 2017A&A...600A..87G (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; Active gal. nuclei ; Radio sources
Keywords: galaxies: Seyfert - galaxies: nuclei - galaxies: jets -
galaxies: active -
Abstract:
Recent XMM-Newton observations have revealed that IRAS 17020+4544 is a
very unusual example of black hole windproduced feedback by a
moderately luminous AGN in a spiral galaxy.
Since the source is known for being a radio emitter, we investigated
about the presence and the properties of a non-thermal component.
We observed IRAS 17020+4544 with the Very Long Baseline Array at 5, 8,
15, and 24GHz within a month of the 2014 XMM-Newton observations. We
further analysed archival data taken in 2000 and 2012. Results. We
detect the source at 5GHz and on short baselines at 8GHz. At 15 and
24 GHz, the source is below our baseline sensitivity for fringe
fitting, indicating the lack of prominent compact features. The
morphology is that of an asymmetric double, with significant diffuse
emission. The spectrum between 5 and 8GHz is rather steep
(Sν∼nu-(1.0±0.2)). Our re-analysis of the archival data at 5
and 8GHz provides results consistent with the new observations,
suggesting that flux density and structural variability are not
important in this source. We put a limit on the separation speed
between the main components of <0.06c.
IRAS 17020+4544 shows interesting features of several classes of
objects: its properties are typical of compact steep spectrum sources,
low power compact sources, radio-emitting narrow line Seyfert 1
galaxies. However, it can not be classified in any of these
categories, remaining so far a one-of-a-kind object.
Description:
We observed IRAS 17020+4544 with the NRAO Very Long Baseline Array
(VLBA) on 2014 February 12, 20 days later than the XMM-Newton
pointing. We observed the source at 5, 8, 15, and 24GHz, for a net
integration time of 10, 20, 60, and 60 minutes, respectively. We
recorded data with the new 2 Gbps rate offered by the VLBA,
corresponding to 8 baseband channels of 32MHz bandwidth each, in full
polarization.
Objects:
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RA (2000) DE Designation(s)
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17 03 30.41 +45 40 47.1 IRAS 17020+4544 = 2XMM J170330.2+454047
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 160 6 Informations on fits images
fits/* . 6 Individual fits images
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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- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 37 A10 "date" Obs.date Observation date
39- 45 F7.5 GHz Freq Observed frequency
47- 49 I3 Kibyte size Size of FITS file
51- 59 A9 --- FileName Name of FITS file, in subdirectory fits
61-160 A100 --- Title Title of the FITS file
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Acknowledgements:
Marcello Giroletti, mgirolet(at)gmail.com
(End) Patricia Vannier [CDS] 07-Feb-2017