2019MNRAS.485.2558G

Query : 2019MNRAS.485.2558G

2019MNRAS.485.2558G - Mon. Not. R. Astron. Soc., 485, 2558-2561 (2019/May-2)

Thick-disc model to explain the spectral state transition in NGC 247.

GUO J., SUN M., GU W.-M. and YI T.

Abstract (from CDS):

We propose the thick-disc model of Gu et al. to interpret the transition between soft ultraluminous state (SUL) and supersoft ultraluminous (SSUL) state in NGC 247. As accretion rate increases, the inner disc will puff up and act as shield to block the innermost X-ray emission regions and absorb both soft and hard X-ray photons. The absorbed X-ray emission will be re-radiated as a much softer blackbody X-ray spectrum. Hence NGC 247 shows flux dips in the hard X-ray band and transits from the SUL state to the SSUL state. The ∼200 s transition time-scale can be explained by the viscous time-scale. According to our model, the inner disc in the supersoft state is thicker and has smaller viscous time-scale than in the soft state. X-ray flux variability, which is assumed to be driven by accretion rate fluctuations, might be viscous time-scale invariant. Therefore, in the SSUL state, NGC 247 is more variable. The bolometric luminosity is saturated in the thick disc; the observed radius-temperature relation can therefore be naturally explained.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - black hole physics - binaries: close - galaxies: individual: (NGC 247)

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 480 2

Query : 2019MNRAS.485.2558G

Basic data :
NGC 247 -- Low Surface Brightness Galaxy
Other object types: otypes_help 		LSB (), G (2014AJ,6dFGS,...), GiG ([CHM2007]), AG? (2020MNRAS), IR (IRAS)
ICRS coord. (ep=J2000) : 		00 47 08.554 -20 45 37.44 (Infrared) [ ] C 2006AJ....131.1163S
FK4 coord. (ep=B1950 eq=1950) : 		00 44 39.870 -21 01 59.81 [ ]
Gal coord. (ep=J2000) : 		113.947416 -83.557085 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 162 [~] / z(spectroscopic) 0.000541 [~] / cz 162.04 [~]
   (Rad) D 2020ApJ...902..145K
Morphological type: 		SAB(s)d D 2013AJ....145..137K
Angular size (arcmin): 		17.0189 5.97876 178 (Opt) B 2023ApJS..269....3M
Fluxes (10) :
U (AB) 10.11 [0.03] C 2014MNRAS.445..881C
B (AB) 9.61 [0.03] C 2014MNRAS.445..881C
V (AB) 9.10 [0.03] C 2014MNRAS.445..881C
R (AB) 8.87 [0.03] C 2014MNRAS.445..881C
J 8.076 [0.029] C 2006AJ....131.1163S
H 7.667 [0.051] C 2006AJ....131.1163S
K 7.430 [0.063] C 2006AJ....131.1163S
g (AB) 9.7143 [0.0003] B 2023ApJS..269....3M
r (AB) 9.1836 [0.0003] B 2023ApJS..269....3M
z (AB) 8.8380 [0.0003] B 2023ApJS..269....3M
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 3
: 46 		: 14 Display criteria :

Identifiers (16) :
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NGC 247 GLXY G113.8-83.5+144 KOS 004439.6-210200 MCG-04-03-005
6dFGS gJ004708.5-204537 IRAS 00446-2101 KUG 0044-210 UGCA 11
ESO 540-22 IRAS F00446-2101 LEDA 2758 [CHM2007] LDC 26 J004708.55-2045374
ESO-LV 540-0220 KOS SP4 1 2MASX J00470855-2045374 [M98c] 004440.0-210200

References (480 between 1850 and 2026) (Total 480)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 7    Distance : 13   

   

Observing logs
ISO : 2    XMM : 1   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NGC 247

Link by name to the catalogue in VizieR :

NGC 247 ESO-LV 540-0220 IRAS 00446-2101 IRAS F00446-2101 KUG 0044-210
2MASX J00470855-2045374

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