J/MNRAS/490/1202 ASKAP EMU ESP, Radio Continuum Survey of the SMC (Joseph+ 2019)
The ASKAP-EMU Early Science Project.
Radio Continuum Survey of the Small Magellanic Cloud.
Joseph T.D., Filipovic M.D., Crawford E.J., Bojicic I., Alexander E.L.,
Wong G.F., Andernach H., Leverenz H., Norris R.P., Alsaberi R.Z.E.,
Anderson C., Barnes L.A., Bozzetto L.M., Bufano F., Bunton J.D.,
Cavallaro F., Collier J.D., Denes H., Fukui Y., Galvin T., Haberl F.,
Ingallinera A., Kapinska A.D., Koribalski B.S., Kothes R., Li D., Maggi P.,
Maitra C., Manojlovic P., Marvil J., Maxted N.I., O'Brien A.N.,
Oliveira J.M., Pennock C.M., Riggi S., Rowell G., Rudnick L., Sano H.,
Sasaki M., Seymour N., Soria R., Stupar M., Tothill N.F.H., Trigilio C.,
Tsuge K., Umana G., Urosevic D., van Loon J.T., Vardoulaki E., Velovic V.,
Yew M., Leahy D., Chu Y.-H., Michalowski M.J., Kavanagh P.J., Grieve K.R.
<Mon. Not. R. Astron. Soc. 490, 1202 (2019)>
=2019MNRAS.490.1202J 2019MNRAS.490.1202J (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio sources
Keywords: catalogues - Magellanic Clouds
Abstract:
We present two new radio continuum images from the Australian Square
Kilometre Array Pathnder (ASKAP) survey in the direction of the Small
Magellanic Cloud (SMC). These images are part of the Evolutionary Map
of the Universe (EMU) Early Science Project (ESP) survey of the Small
and Large Magellanic Clouds. The two new source lists produced from
these images contain radio continuum sources observed at 960MHz (4489
sources) and 1320MHz (5954 sources) with a bandwidth of 192MHz and
beam sizes of 30.0"x30.0" and 16.3"x15.1", respectively. The median
Root Mean Squared (RMS) noise values are 186Jy/beam (960MHz) and
165Jy/beam (1320MHz). To create point source catalogues, we use
these two source lists, together with the previously published
Molonglo Observatory Synthesis Telescope (MOST) and the Australia
Telescope Compact Array (ATCA) point source catalogues to estimate
spectral indices for the whole population of radio point sources found
in the survey region. Combining our ASKAP catalogues with these radio
continuum surveys, we found 7736 point-like sources in common over an
area of 30deg2. In addition, we report the detection of two new, low
surface brightness supernova remnant candidates in the SMC. The high
sensitivity of the new ASKAP ESP survey also enabled us to detect the
bright end of the SMC planetary nebula sample, with 22 out of 102
optically known planetary nebulae showing point-like radio continuum
emission. Lastly, we present several morphologically interesting
background radio galaxies.
Description:
We present two new catalogues from the ASKAP ESP surveys for different
types of radio continuum sources towards the SMC. These catalogues
were obtained from images taken at 960MHz (λ=32cm) and 1320MHz
(λ=23cm). For the point source catalogue, we combine the ASKAP
data with the previously published MOST catalogue (Turtle et al.
1998PASA...15..280T 1998PASA...15..280T; Wong et al. 2011SerAJ.183..103W 2011SerAJ.183..103W, Cat.
J/other/Ser/183.103) and the ATCA = 20, 13, 6 and 3cm catalogues (Wong
et al. 2011SerAJ.183..103W 2011SerAJ.183..103W, Cat. J/other/Ser/183.103,
2012SerAJ.184...93W 2012SerAJ.184...93W, J/other/Ser/184.93, and references therein).
Table2 and table3 contain the ID number of the sources and their
coordinates (J2000) detected with the Australia SKA Pathfinder (ASKAP)
telescope at 960MHz and 1320MHz in 2017, September and November
respectively. Sources are associated with background AGN, PNe and
other point sources within the SMC. The number of detected sources is
4489 (960MHz) and 5954 (1320MHz).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 39 4489 Point source catalogue derived from our
ASKAP 960MHz image
table3.dat 41 5954 Point source catalogue derived from our
ASKAP 1320MHz image
table4.dat 113 7736 Combined catalogue of point sources
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- N960 [1/4489] Sequential number of 960MHz source
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 35 F6.1 mJy S960 Flux density at 960MHz
37- 39 F3.1 mJy e_S960 rms uncertainty on S960
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- N1320 [1/5954] Sequential number of 1320MHz source
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 36 F7.2 mJy S1320 Flux density at 1320MHz
38- 41 F4.2 mJy e_S1320 rms uncertainty on S1320
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- No [1/7736] Sequential number of 960MHz/1320MHz
source, should be referenced as
EMU-ESP-SMC-??? NNNN
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 36 F7.2 mJy S843 ?=- MOST 843MHz flux density
38- 44 F7.2 mJy S960 ?=- ASKAP 960MHz flux density
46- 51 F6.2 mJy S1320 ?=- ASKAP 1320MHz flux density
53- 58 F6.2 mJy S14000 ?=- ATCA 1.4GHz flux density
60- 65 F6.2 mJy S2370 ?=- ATCA 2.3GHz flux density
67- 72 F6.2 mJy S4800 ?=- ATCA 4.8GHz flux density
74- 79 F6.2 mJy S8640 ?=- ATCA 8.6GHz flux density
81 I1 --- Npt [1/7] Number of points
83- 88 F6.2 --- Sp+Index ?=- Spectral index alpha
89 A1 --- n_Sp+Index [f] f for fixed spectral index
91- 96 F6.3 --- e_Sp+Index ?=- rms uncertainty on Sp+Index
98-103 F6.1 mJy S1000 ?=- 1GHz flux density
105-108 I4 --- N960 ?=- Sequential number of 960MHz source
(as in table 2)
110-113 I4 --- N1320 ?=- Sequential number of 1320MHz source
(as in table 3)
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Acknowledgements:
Tana Joseph, tana.joseph(at)manchester.ac.uk
(End) Patricia Vannier [CDS] 23-Sep-2019