J/MNRAS/474/4112 Candidate RR Lyr star streams in inner Galaxy (Mateu+, 2018)
Fourteen candidate RR Lyrae star streams in the inner Galaxy.
Mateu C., Read J.I., Kawata D.
<Mon. Not. R. Astron. Soc., 474, 4112-4129 (2018)>
=2018MNRAS.474.4112M 2018MNRAS.474.4112M (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Stars, variable ; Optical
Keywords: methods: data analysis - astronomical data bases: miscellaneous -
stars: variables: RR Lyrae - Galaxy: halo - Galaxy: structure
Abstract:
We apply the GC3 stream-finding method to RR Lyrae stars (RRLSs) in
the Catalina survey. We find 2 RRLS stream candidates at >4σ
confidence and another 12 at >3.5σ confidence over the
Galactocentric distance range 4<D/kpc<26. Of these, only two are
associated with known globular clusters (NGC 1261 and Arp2). The
remainder are candidate 'orphan' streams, consistent with the idea
that globular cluster streams are most visible close to dissolution.
Our detections are likely a lower bound on the total number of
dissolving globulars in the inner galaxy, since many globulars have
few RRLSs, while only the brightest streams are visible over the
Galactic RRLS background, particularly given the current lack of
kinematical information. We make all of our candidate streams publicly
available and provide a new galstreamspython library for the
footprints of all known streams and overdensities in the Milky Way.
Description:
We have applied the GC3 stream-finding method to RRLSs in the Catalina
survey that is sensitive to nearby streams over the Galactocentric
distance range 4<D/kpc<26.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 29 Detection and geometric properties of the
stream candidates detected in GC3 +nGC3 PCMs
table2.dat 73 14 Properties of the stream candidates detected
in GC3 +nGC3 PCMs
table3.dat 119 478 RRLSs associated with each of the
stream candidates
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See also:
I/339 : Hot Stuff for One Year (HSOY) (Altmann+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Group Group (G1)
3- 8 A6 --- IDcand Stream Candidate ID (NN.N-N)
10- 15 F6.2 deg phi Pole heliocentric angle phi
17- 21 F5.2 deg theta Pole heliocentric angle theta
23- 28 F6.2 deg GLON Pole Galactocentric longitude
30- 34 F5.2 deg GLAT Pole Galactocentric latitude
36- 40 F5.2 kpc Rgal Mean Galactocentric distance
42- 45 F4.2 kpc e_Rgal standard deviation of Rgal
47- 52 F6.2 deg GLONc Central Galactocentric longitude
54- 59 F6.2 deg GLATc Central Galactocentric latitude
61- 65 F5.2 kpc RhelMin Minimum helicentric distance
67- 71 F5.2 kpc RhelMax Maximum helicentric distance
73- 76 F4.2 deg Dtheta Galactocentric stream width (perpendicular to
the stream's plane) in degrees
78- 80 I3 pc Dtheta2 Galactocentric stream width (perpendicular to
the stream's plane) in pc
82- 84 F3.1 --- NS1 Detection significance in Nσ unit
(detection significance for those poles with
a counterpart detection in the GC3 +nGC3 PCM
with a 0.5" tolerance is 1°
86- 88 F3.1 --- NS0.5 ? Detection significance in Nσ unit
(detection significance for those poles with
a counterpart detection in the GC3 +nGC3 PCM
with a 0.5" tolerance is 0.1°)
90- 92 F3.1 --- Btx Average bootstrap significance
94-107 A14 --- Com Comments
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 A1 --- Group Group (G1)
3- 8 A6 --- IDcand Stream Candidate ID (NN.N-N)
10- 11 I2 --- Nallab Total number of RRLSs associated with
each pole detection
13- 16 F4.2 --- Purity Expected purity of each detection
18- 19 I2 --- Nexpab Expected number of RRLSs that would truly
belong to the stream candidate,
i.e. excluding contaminants
21- 24 F4.2 --- fOoI Fraction of RRLSs of Oosterhoff type I
26- 29 F4.2 --- fOoInt Fraction of RRLSs of Oosterhoff type Int
31- 34 F4.2 --- fOoII Fraction of RRLSs of Oosterhoff type II
36 A1 --- OType [I] Oosterhoff type
38- 41 F4.2 --- OProb Poisson probability
43- 46 F4.1 mag VMAG Absolute V magnitude posterior mod
48- 51 F4.2 mag e_VMAG Error on VMAG (lower value)
53- 56 F4.2 mag E_VMAG Error on VMAG (upper value)
58 A1 --- l_LV Limit flag on LV
59- 62 F4.1 Lsun LV Total luminosity
64- 73 A10 --- Com Comment
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- IDcand Stream Candidate ID (NN.N-N)
8- 23 A16 --- CSS-SSS-ID Catalina object ID (JHHMMSS.s+DDMMSS)
25- 33 F9.5 deg RAdeg Right ascension (J2000)
35- 43 F9.5 deg DEdeg Declination (J2000)
45- 49 F5.2 kpc Rhel Heliocentric distance
51- 55 F5.2 kpc Rgal Galactocentric distance
(assuming Xsun=-8.5kpc)
57- 63 F7.5 d Period Light curve period
65- 68 F4.2 mag AmpV Light curve amplitude
70- 75 F6.3 [-] [Fe/H] Metallicity
77 I1 --- Flag [0/1] FeH flag (1)
79- 82 F4.1 mas/yr pmRA HSOY proper motion in RA*cos(DE)
84- 86 F3.1 mas/yr e_pmRA rms uncertainty on pmRA
88- 92 F5.1 mas/yr pmDE HSOY proper motion in declination
94- 96 F3.1 mas/yr e_pmDE rms uncertainty on pmDE
98-119 E22.17 --- HSOY-ID HSOY object ID (troncated)
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Note (1): FeH flag as follows:
0 = metallicity from Drake+2013
1 = photometric metallicity computed in this paper
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Global notes:
Note (G1): Groups as follows:
A = High-confidence candidates
B = Tentative candidates
C = Possible artefacts
D = Repeated detections
E = Unambiguous detections of known streams
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Feb-2021