J/A+A/595/L8 MCG+07-47-10 total intensity image at 322MHz (Mulcahy+, 2016)
Discovery of a low-luminosity spiral DRAGN.
Mulcahy D.D., Mao M.Y., Mitsuishi I., Scaife A.M.M., Clarke A.O.,
Babazaki Y., Kobayash H., Suganuma R., Matsumoto H., Tawara Y.
<Astron. Astrophys. 595, L8 (2016)>
=2016A&A...595L...8M 2016A&A...595L...8M (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio
Keywords: galaxies: spiral - galaxies: jets - radio continuum: galaxies
Abstract:
Standard galaxy formation models predict that large-scale double-lobed
radio sources, known as DRAGNs, will always be hosted by elliptical
galaxies. In spite of this, in recent years a small number of spiral
galaxies have also been found to host such sources. These so-called
spiral DRAGNs are still extremely rare, with only ∼5 cases being
widely accepted. Here we report on the serendipitous discovery of a
new spiral DRAGN in data from the Giant Metrewave Radio Telescope
(GMRT) at 322MHz. The host galaxy, MCG+07-47-10, is a face-on
late-type Sbc galaxy with distinctive spiral arms and prominent bulge
suggesting a high black hole mass. Using WISE infra-red and GALEX UV
data we show that this galaxy has a star formation rate of
0.16-0.75M☉/yr, and that the radio luminosity is dominated by
star-formation. We demonstrate that this spiral DRAGN has similar
environmental properties to others of this class, but has a
comparatively low radio luminosity of L1.4GHz=1.12x1022W/Hz, two
orders of magnitude smaller than other known spiral DRAGNs. We suggest
that this may indicate the existence of a previously unknown
low-luminosity population of spiral DRAGNS.
Description:
Total Intensity image of the spiral DRAGN MCG+07-47-10 with the 325MHz
receiver of the GMRT at 9.4x8.3-arcsec resolution. The central
frequency is 322MHz. Full details of the observation, calibration and
imaging can be seen in the paper.
Objects:
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RA (2000) DE Designation(s)
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23 18 32.77 +43 14 48.9 MCG+07-47-10 = LEDA 71005
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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 1 Information of fits files
spdragn.fits 2880 124 Total Intensity image of MCG+07-47-10 at 322MHz
taken with the GMRT
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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- 49 A22 --- Obs.Date Observation date
51- 57 F7.3 MHz Freq Observed frequency
59- 61 I3 Kibyte size Size of FITS file
63- 74 A12 --- FileName Name of FITS file
76-142 A67 --- Title Title of the FITS file
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Acknowledgements:
David Mulcahy, david.mulcahy(at)manchester.ac.uk
(End) Patricia Vannier [CDS] 24-Oct-2016