J/ApJ/934/59 StrayCats. II. Updated NuSTAR stray light obs. (Ludlam+, 2022)
StrayCats.
II. An updated catalog of NuSTAR stray light observations.
Ludlam R.M., Grefenstette B.W., Brumback M.C., Tomsick J.A.,
Buisson D.J.K., Coughenour B.M., Mastroserio G., Wik D., Krivonos R.,
Jaodand A.D., Madsen K.K.
<Astrophys. J., 934, 59 (2022)>
=2022ApJ...934...59L 2022ApJ...934...59L
ADC_Keywords: Binaries, X-ray; Stars, neutron; Black holes; Surveys;
X-ray sources
Keywords: X-ray surveys ; Astrophysical black holes ; Neutron stars ;
Low-mass x-ray binary stars ; High mass x-ray binary stars
Abstract:
We present an updated catalog of StrayCats (a catalog of NuSTAR stray
light observations of X-ray sources) that includes nearly 18 additional
months of observations. StrayCats v2 has an added 53 sequence IDs,
106 rows, and three new identified stray light (SL) sources in
comparison to the original catalog. The total catalog now has
489 unique sequence IDs, 862 entries, and 83 confirmed StrayCats
sources. Additionally, we provide new resources for the community to
gauge the utility and spectral state of the source in a given
observation. We have created long-term light curves for each
identified SL source using MAXI and Swift/BAT data when available.
Further, source extraction regions for 632 identified SL observations
were created and are available to the public. In this paper we present
an overview of the updated catalog and new resources for each
identified StrayCats SL source.
Description:
The Nuclear Spectroscopic Telescope Array (NuSTAR) is the first hard
X-ray focusing telescope with a passband from 3 to 80keV. Stray light
observations arise for bright X-ray sources 1°-4° away from
the telescope pointing direction. Recently, the first systematic
identification of stray light in NuSTAR observations was carried out
and compiled into a catalog known as StrayCats (Grefenstette+ 2021,
Cat. J/ApJ/909/30).
The catalog has been updated to include NuSTAR observations from the
end of the prior release (2020 July 15 to 2022 January 4).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 365 857 The updated StrayCats table that contains
additional information on the identified stray
light sources
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See also:
J/ApJ/825/132 : NuSTAR hard X-ray survey of the Gal. Center. II. (Hong+, 2016)
J/ApJ/864/150 : Black holes & neutron stars in nearby galaxies (Vulic+, 2018)
J/ApJ/909/30 : StrayCats: NuSTAR stray light obs. (Grefenstette+, 2021)
http://nustarstraycats.github.io/straycats/ : StrayCats home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Labe Explanations
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1- 15 A15 --- ID StrayCats identifier (StrayCatsI_NNN with
NNN between 0 and 755 or StrayCatsII_NNN
with NNN between 0 and 105)
17- 23 A7 --- Type Classification as in Paper I (1)
25- 35 I11 --- SeqID [10002008001/90701342002] NuStar sequence
identifier
37 A1 --- Mod [AB] NuStar module
39- 49 F11.4 s Exp [1904/472872] NuStar exposure time
51 A1 --- m_SeqID [NY] Multiple exposures? (Y)es or (N)o
53- 77 A25 --- Primary Primary source identifier
79- 96 F18.12 d Start Modified Julian Date of observation start
98- 115 F18.12 d End Modified Julian Date of observation end
117- 124 F8.4 deg RAdeg [5/352] Primary Right Ascension (J2000)
126- 134 F9.4 deg DEdeg [-74/70] Primary Declination (J2000)
136- 158 A23 --- SLName Stray light source identifier
160- 171 A12 --- SLClass Stray light source type (2)
173- 195 A23 --- Simbad Stray light source Simbad identifier if any
197- 206 F10.5 deg RASdeg ?=-999 Stray light Right Ascension in
decimal degrees (J2000)
208- 217 F10.5 deg DESdeg ?=-999 Stray light Declination in decimal
degrees (J2000)
219- 227 F9.4 cm-2 Area [0.02/10.3]?=-999 Illuminating area of
observation
229- 236 F8.1 ct STot [45/945325]?=-999 Soft, 3-8 keV, total
events
238- 244 F7.2 ct e_STot [6/973]?=-999 The 1σ uncertainty in
STot
246- 253 F8.1 ct HTot [27/219843]?=-999 Hard, 8-13 keV, total
events
255- 261 F7.2 ct e_HTot [5/469]?=-999 The 1σ uncertainty in
HTot
263- 270 F8.3 --- HR [0.01/5.6]?=-999 Hardness ratio, H/S
272- 279 F8.3 --- e_HR [0/0.8]?=-999 The 1σ uncertainty in
HR
281- 291 F11.6 ct/cm2/s IS [0.008/6.1]?=-999 Soft intensity
293- 301 E9.2 ct/cm2/s e_IS [0.0001/0.03]?=-999 1σ uncertainty in
IS
303- 313 F11.6 ct/cm2/s IH [0.003/2.3]?=-999 Hard intensity
315- 323 E9.2 ct/cm2/s e_IH [0.0001/0.02]?=-999 1σ uncertainty in
IH
325- 333 F9.4 ct/cm2/s ISbk [0.008/0.2]?=-999 Soft background intensity
335- 344 F10.5 ct/cm2/s e_ISbk [0.004/0.1]?=-999 50% systematic
uncertainty in ISbk
346- 354 F9.4 ct/cm2/s IHbk [0.003/0.1]?=-999 Hard background intensity
356- 365 F10.5 ct/cm2/s e_IHbk [0.001/0.05]?=-999 50% systematic
uncertainty in IHbk
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Note (1): Classification as follows:
SL = The source has been positively identified as a StrayCats target
(632 occurrences).
Complex = Stray light is present, but there are multiple overlapping stray
light regions that make the sources difficult to identify
(63 occurrences).
Faint = Stray light is present but too faint to be positively identified
(61 occurrences).
GR = The observation contains ghost rays from sources just outside of
the FoV (74 occurrences).
Unkn = A stray light pattern is present, but the source of the stray light
remains unknown (27 occurrences).
Note (2): Source type as follows:
LMXB-NS = low-mass X-ray binary, neutron star (374 occurrences)
HMXB-NS = high-mass X-ray binary, neutron star (84 occurrences)
HMXB-BH = high-mass X-ray binary, black hole (35 occurrences)
LMXB-BH = low-mass X-ray binary, black hole (19 occurrences)
PWNe = pulsar wind nebulae (68 occurrences)
BHC = Black hole candidate (41 occurrences)
AGN = active galaxy (20 occurrences)
SNR = supernova remnant (5 occurrences)
Radio galaxy = 2 occurrences
Cluster = Galaxy cluster (2 occurrences)
?? = Unclassified (207 occurrences)
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History:
From electronic version of the journal
References:
Grefenstette et al. Paper I. 2021ApJ...909...30G 2021ApJ...909...30G Cat. J/ApJ/909/30
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Jul-2024