J/ApJ/822/60 RXTE observations of GRS 1915+105 (Peris+, 2016)
X-ray spectral analysis of the steady states of GRS1915+105.
Peris C.S., Remillard R.A., Steiner J.F., Vrtilek S.D., Varniere P.,
Rodriguez J., Pooley G.
<Astrophys. J., 822, 60-60 (2016)>
=2016ApJ...822...60P 2016ApJ...822...60P (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, X-ray
Keywords: accretion, accretion disks; binaries: close; black hole physics;
magnetic fields; X-rays: binaries;
X-rays: individual: GRS1915+105
Abstract:
We report on the X-ray spectral behavior within the steady states of
GRS1915+105. Our work is based on the full data set of the source
obtained using the Proportional Counter Array (PCA) on the Rossi X-ray
Timing Explorer (RXTE) and 15GHz radio data obtained using the Ryle
Telescope. The steady observations within the X-ray data set naturally
separated into two regions in the color-color diagram and we refer to
these regions as steady-soft and steady-hard. GRS1915+105 displays
significant curvature in the coronal component in both the soft and
hard data within the RXTE/PCA bandpass. A majority of the steady-soft
observations displays a roughly constant inner disk radius (Rin),
while the steady-hard observations display an evolving disk truncation
which is correlated to the mass accretion rate through the disk. The
disk flux and coronal flux are strongly correlated in steady-hard
observations and very weakly correlated in the steady-soft
observations. Within the steady-hard observations, we observe two
particular circumstances when there are correlations between the
coronal X-ray flux and the radio flux with log slopes
η∼0.68±0.35 and η∼1.12±0.13. They are consistent with the
upper and lower tracks of Gallo et al. (2012MNRAS.423..590G 2012MNRAS.423..590G),
respectively. A comparison of the model parameters to the state
definitions shows that almost all of the steady-soft observations
match the criteria of either a thermal or steep power-law state, while
a large portion of the steady-hard observations match the hard-state
criteria when the disk fraction constraint is neglected.
Description:
During its operational period, RXTE/PCA observed GRS1915 ∼1800 times.
We selected four energy bands A (2.2-3.6keV), B (3.6-5.0keV), C
(5.0-8.6keV), and D (8.6-18.0keV).
The Ryle telescope (now transformed into the AMI large array) located
at the Mullard Radio Astronomy Observatory in the UK has collected
nearly daily observations of GRS1915, at 15GHz, from 1995 May to 2006
June; providing a 10yr overlap with our RXTE/PCA X-ray observations.
Objects:
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RA (ICRS) DE Designation(s)
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19 15 11.55 +10 56 44.8 GRS1915+105 = Granat 1915+105
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 53 1257 Observation list
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
B/xmm : XMM-Newton Obs. Log (XMM-Newton Science Operation Center, 2012)
VI/117 : Observation Log from ASCA (PLAIN Center, 2001)
J/ApJS/209/14 : The Swift/BAT hard X-ray transient monitor (Krimm+, 2013)
J/AJ/141/129 : Chandra Transmission Grating Data Catalog (Huenemoerder+, 2011)
J/A+A/522/A68 : Variable sources detected by INTEGRAL (Telezhinsky+, 2010)
J/A+A/513/A21 : GRS 1915+105 timing analysis (Massaro+, 2010)
J/A+A/493/339 : XMM-Newton serendipitous Survey. V. (Watson+, 2009)
J/A+A/467/585 : Sources detected by ISGRI (Bodaghee+, 2007)
J/ApJ/657/409 : K-band light curve of GRS 1915+105 (Neil+, 2007)
J/A+A/397/711 : Comptonization and reflection in GRS 1915+105 (Rau+, 2003)
http://www.chaos-project.fr/ : CHAOS project home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Ref Data reference name using Mission Elapsed Time
(MET) day (1)
9- 19 F11.5 d MJD Modified Julian Date of exposure midpoint;
MJD=JD-2400000.5
21- 29 I9 s Start Mission elapsed time start (1)
31- 39 I9 s End Mission elapsed time end (1)
41- 44 I4 s Exp [432/3616] Exposure time
46- 49 A4 --- Type Type (993 sources "hard" and 264 "soft")
51- 53 A3 --- Fit [yes/no ] Good-fit? (2)
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Note (1): The time since 1994 January 1 0h (UTC). RXTE Standard 2 data is
collected during 16s intervals of Spacecraft time (SCT), which is
related by: MET=SCT+3.374. Here the times are in integer seconds
and the truncated fraction is 0.374s.
Note (2): Indicates whether a good-fit (Χ2ν<2) was achieved or not
(1127 sources "yes").
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Aug-2016