J/A+A/642/A141 Flux-limited sample of HBL blazars, OUSXG (Giommi+, 2020)
Open Universe survey of Swift-XRT GRB fields:
Flux-limited sample of HBL blazars.
Giommi P., Chang Y.-L., Turriziani S., Glauch T., Leto C., Verrecchia F.,
Padovani P., Penacchioni A.V., Arneodo F., Barres de Almeida U.,
Brandt C.H., Capalbi M., Civitarese O., D'Elia V., Di Giovanni A.,
De Angelis M., Del Rio Vera J., Di Pippo S., Middei R., Perri M.,
Pollock A.M.T., Puccetti S., Ricard N., Ruffini R., Sahakyan N.
<Astron. Astrophys. 642, A141 (2020)>
=2020A&A...642A.141G 2020A&A...642A.141G (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources
Keywords: surveys - methods: data analysis - galaxies: active -
X-rays: galaxies - catalogues
Abstract:
We have analysed all the X-ray images centred on Gamma Ray Bursts
generated by Swift over the last 15 years using automatic tools that
do not require any expertise in X-ray astronomy, producing results in
excellent agreement with previous findings. This work, besides
presenting the largest medium-deep survey of the X-ray sky and a
complete sample of blazars, wishes to be a step in the direction of
achieving the ultimate goal of the Open Universe Initiative, that is
to enable non expert people to fully benet of space science data,
possibly extending the potential for scientific discovery, currently
conned within a small number of highly specialised teams, to a much
larger population.
We have used the Swift deepsky Docker container encapsulated pipeline
to build the largest existing flux-limited and unbiased sample of
serendipitous X-ray sources. Swift deepsky runs on any laptop or
desktop computer with a modern operating system. The tool
automatically downloads the data and the calibration files from the
archives, runs the official Swift analysis software and produces a
number of results including images, the list of detected sources,
X-ray fluxes, SED data, and spectral slope estimations.
We used our source list to build the LogN-LogS of extra-galactic
sources, which perfectly matches that estimated by other satellites.
Combining our survey with multi-frequency data we selected a complete
radio flux-density limited sample of High Energy Peaked (HBL) blazars.
The LogN-LogS built with this data-set confirms that previous samples
are incomplete below ∼20mJy.
Description:
The OUSXG catalog is a flux limited unbiased survey of the X-ray sky
contains 31227 serendipitous sources. The catalog was built by
analyzing all the Swift XRT X-ray images centered on Gamma Ray Bursts
generated by Swift over the last 15 years. The use of the
Swift_deepsky pipeline, which does not require any expertise in X-ray
astronomy, associated with effective cleaning algorithms, allowed us
to build a sample of serendipitous X-ray sources that is sufficiently
clean to be used for statistical purposes without any visual or manual
intervention. The X-ray LogN-LogS of extragalactic sources shows that
it is in excellent agreement with previous measurements. We have built
a deep radio-flux limited sample of 23 HBL blazars, combined with
larger (and brighter) samples selected using the RASS survey, is
suitable for detailed statistical analyses.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ousxg.dat 432 31227 The OUSXG catalog
hspsub.dat 72 23 HSP subsample
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Byte-by-byte Description of file: ousxg.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Designation, OUSXGJHHMMSS+DDMM.m) (NAME)
21- 42 A22 --- OName Other Name (OTHER_NAME)
44- 52 F9.5 deg RAdeg Right ascension (J2000) (RAJ2000)
54- 62 F9.5 deg DEdeg Declination (J2000) (DEJ2000)
64- 73 F10.4 d MJD0 Observation starting time (MJD_Start)
75- 84 F10.4 d MJD1 Observation end time (MJD_End)
86- 94 E9.3 ct/s CR0.3-10 Count rate between 0.3keV-10keV (CTR0310)
96-104 E9.3 ct/s e_CR0.3-10 Count rate error between 0.3keV-10keV
(CTR0310_ERROR)
106-112 I7 s ExpTime Exposure time (Exposure_time)
114-122 E9.3 ct/s CR0.3-1 ? Count rate between 0.3keV-1keV (CTR031)
124-132 E9.3 ct/s e_CR0.3-1 ? Count rate error between 0.3keV-1keV
(CTR031_ERROR)
134-142 E9.3 ct/s CR0.3-1UL ? Count rate upper limit between 0.3keV-1keV
(CTR031_UL)
144-152 E9.3 ct/s CR1-2 ? Count rate between 1keV-2keV (CTR12)
154-162 E9.3 ct/s e_CR1-2 ? Count rate error between 1keV-2keV
(CTR12_ERROR)
164-172 E9.3 ct/s CR1-2UL ? Count rate upper limit between 1keV-2keV
(CTR12_UL)
174-182 E9.3 ct/s CR2-10 ? Count rate between 2keV-10keV (CTR210)
184-192 E9.3 ct/s e_CR2-10 ? Count rate error between 2keV-10keV
(CTR210_ERROR)
194-202 E9.3 ct/s CR2-10UL ? Count rate upper limit between 2keV-10keV
(CTR210_UL)
204-212 E9.3 mW/m2 Flux0.3-10 Flux between 0.3keV-10keV (FLUX0310)
214-222 E9.3 mW/m2 e_Flux0.3-10 Flux error between 0.3keV-10keV
(FLUX0310_ERROR)
224-232 E9.3 mW/m2 Flux0.3-1 ? Flux between 0.3keV-1keV (FLUX031)
234-242 E9.3 mW/m2 e_Flux0.3-1 ? Flux error between 0.3keV-1keV
(FLUX031_ERROR)
244-252 E9.3 mW/m2 Flux0.3-1UL ? Flux upper limit between 0.3keV-1keV
(FLUX031_UL)
254-262 E9.3 mW/m2 Flux1-2 ? Flux between 1keV-2keV (FLUX12)
264-272 E9.3 mW/m2 e_Flux1-2 ? Flux error between 1keV-2keV
(FLUX12_ERROR)
274-282 E9.3 mW/m2 Flux1-2UL ? Flux upper limit between 1keV-2keV
(FLUX12_UL)
284-292 E9.3 mW/m2 Flux2-10 ? Flux between 2keV-10keV (FLUX210)
294-302 E9.3 mW/m2 e_Flux2-10 ? Flux error between 2keV-10keV
(FLUX210_ERROR)
304-312 E9.3 mW/m2 Flux2-10UL ? Flux upper limit between 2keV-10keV
(FLUX210_UL)
314-322 E9.3 mW/m2 nuFnu0.5kEv ? Flux at 0.5keV (NUFNU05KEV)
324-332 E9.3 mW/m2 e_nuFnu0.5kEv ? Flux error at 0.5keV (NUFNU05KEV_ERROR)
334-342 E9.3 mW/m2 nuFnu1kEv Flux at 1keV (NUFNU1KEV)
344-352 E9.3 mW/m2 e_nuFnu1kEv Flux error at 1keV (NUFNU1KEV_ERROR)
354-362 E9.3 mW/m2 nuFnu1.5kEv Flux at 1.5keV (NUFNU15KEV)
364-372 E9.3 mW/m2 e_nuFnu1.5kEv Flux error at 1.5keV (NUFNU15KEV_ERROR)
374-382 E9.3 mW/m2 nuFnu3kEv Flux at 3keV (NUFNU3KEV)
384-392 E9.3 mW/m2 e_nuFnu3kEv Flux error at 3keV (NUFNU3KEV_ERROR)
394-402 E9.3 mW/m2 nuFnu45kEv Flux at 4.5 keV (NUFNU45KEV)
404-412 E9.3 mW/m2 e_nuFnu45kEv Flux error at 4.5keV (NUFNU45KEV_ERROR)
414-420 F7.4 --- SpSlope ? Spectral slope (SPECTRAL_SLOPE)
422-428 F7.4 --- e_SpSlope ? Spectral slope error
(SPECTRALSLOPEERROR)
430-432 A3 --- Pileup-Flag [YES/NO ] Pileup flag (PILEUP_FLAG)
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Byte-by-byte Description of file: hspsub.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Designation, OUSXGJHHMMSS+DDMM.m)
21- 40 A20 --- Blazar Blazar counterpart name (Blazar_name)
42- 44 A3 --- DetinRASS Detected in RASS survey (DetectedinRASS)
46- 50 F5.1 mJy SRadio Radio flux density at 1.4GHz or 843MHz
(Radiofluxdensity)
52- 56 F5.3 --- z Redshift (Redshift)
57 A1 --- u_z [?] Uncertainty flag on z
58- 66 E9.3 mW/m2 XRTFlux0.5-2 OUSXG XRT flux between 0.5-2 keV
(XRTflux05_2)
68 A1 --- l_Nupeak [~] Limit flag on Nupeak
69- 72 F4.1 Hz Nupeak Log synchrotron peak frequency (Nu_peak)
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Acknowledgements:
Chang Yu Ling, stsun1223(at)hotmail.com
Paolo Giommi, giommipaolo(at)gmail.com
(End) Paolo Giommi [ASI/TUM-IAS], Patricia Vannier [CDS] 20-Jul-2020