2022A&A...661A...8B


Query : 2022A&A...661A...8B

2022A&A...661A...8B - Astronomy and Astrophysics, volume 661A, 8-8 (2022/5-1)

The eROSITA Final Equatorial-Depth Survey (eFEDS). Variability catalogue and multi-epoch comparison.

BOLLER T., SCHMITT J.H.M.M., BUCHNER J., FREYBERG M., GEORGAKAKIS A., LIU T., ROBRADE J., MERLONI A., NANDRA K., MALYALI A., KRUMPE M., SALVATO M. and DWELLY T.

Abstract (from CDS):

The 140-square-degrees Final Equatorial-Depth Survey (eFEDS) field, observed with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma mission, provides a first look at the variable eROSITA sky. We analysed the intrinsic X-ray variability of the eFEDS sources and provide X-ray light curves and tables with variability test results in the 0.2-2.3 keV (soft) and 2.3-5.0 keV (hard) bands. We performed variability tests using the traditional normalised excess variance and maximum amplitude variability methods (as performed for the 2RXS catalogue), and we present results from the Bayesian excess variance and Bayesian block methods. We identified 65 sources as being significantly variable in the soft band. In the hard band, only one source is found to vary significantly. For the most variable sources, the light curves are well fit by an empirical stellar flare model and reveal extreme flare properties. A few highly variable active galactic nuclei have also been detected. About half of the variable eFEDS sources are detected in the X-rays for the first time with eROSITA. Comparison with 2RXS and XMM-Newton observations provides variability information on timescales of years to decades.

Abstract Copyright: © Th. Boller et al. 2022

Journal keyword(s): X-rays: general - line: formation - surveys

VizieR on-line data: <Available at CDS (J/A+A/661/A8): efeds_va.dat efeds_vary.fits>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 977 0
2 2MASS J06270005-5622041 * 06 27 00.0463391712 -56 22 04.146687012           ~ 3 0
3 SDSS J083125.18+034333.1 BiC 08 31 25.1856590016 +03 43 33.138694848           ~ 2 0
4 LEDA 3095818 Sy1 08 40 25.5121679232 +03 33 01.791840996   17.49 17.19     ~ 22 0
5 SDSS J084150.93-001540.7 BiC 08 41 50.938 -00 15 40.77           ~ 2 0
6 TYC 211-1502-1 PM* 08 44 42.1338143400 +00 44 15.936102960   11.27 10.21     G/K: 6 0
7 [VV2006] J085141.5+011930 QSO 08 51 41.4589826760 +01 19 30.288131760   18.22 17.92     ~ 25 0
8 2MASX J08561784-0138073 Sy1 08 56 17.8314216984 -01 38 07.356270156   14.4   11.7   ~ 24 0
9 SDSS J090905.13+010929.6 G 09 09 05.139 +01 09 29.62           ~ 3 0
10 HD 78727 PM* 09 09 54.1235653920 +05 12 12.553108236   9.42 8.36     K4 10 0
11 SDSS J091000.01+034429.1 QSO 09 10 00.0163890744 +03 44 29.202834660   19.3   19.4   ~ 8 0
12 [VV2006] J091637.5+004734 QSO 09 16 37.5573264216 +00 47 34.070966592   21.88 20.74     ~ 28 0
13 HD 79873 PM* 09 16 39.9782365392 +00 43 44.538305520   7.18 6.76     F3V 39 0
14 SDSSCGB 12543.2 G 09 20 35.6023353360 +03 05 15.806567616           ~ 2 0
15 [VV2006] J092346.8+011142 QSO 09 23 46.8003905784 +01 11 42.514748160   20.85 20.50     ~ 18 0
16 TXS 0929+017 Rad 09 31 51.16 +01 30 47.7           ~ 1 0
17 Mrk 707 Sy1 09 37 01.0466933232 +01 05 43.747904040   16.86 16.64     ~ 133 0

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2022.08.09-15:53:33

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