J/ApJ/914/123 Gaia DR2 and EDR3 stars with sp. follow-up (Ibata+, 2021)
Charting the Galactic acceleration field.
I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from
ESPaDOnS and UVES.
Ibata R., Malhan K., Martin N., Aubert D., Famaey B., Bianchini P.,
Monari G., Siebert A., Thomas G.F., Bellazzini M., Bonifacio P., Caffau E.,
Renaud F.
<Astrophys. J., 914, 123 (2021)>
=2021ApJ...914..123I 2021ApJ...914..123I
ADC_Keywords: Spectra, optical; Radial velocities; Associations, stellar;
Proper motions; Parallaxes, trigonometric; Colors
Keywords: Milky Way Galaxy ; Dark matter
Abstract:
We present maps of the stellar streams detected in the Gaia Data
Release 2 (DR2) and Early Data Release 3 (EDR3) catalogs using the
STREAMFINDER algorithm. We also report the spectroscopic follow-up of
the brighter DR2 stream members obtained with the high-resolution
CFHT/ESPaDOnS and VLT/UVES spectrographs as well as with the
medium-resolution NTT/EFOSC2 spectrograph. Two new stellar streams
that do not have a clear progenitor are detected in DR2 (named Hrid
and Gunnthra), and seven are detected in EDR3 (named Gaia-6 to
Gaia-12). Several candidate streams are also identified. The software
also finds very long tidal tails associated with the 15 globular
clusters: NGC 288, NGC 1261, NGC 1851, NGC 2298, NGC 2808, NGC 3201,
M68, ωCen, NGC 5466, Palomar 5, M5, NGC 6101, M92, NGC 6397, and
NGC 7089. These stellar streams will be used in subsequent
contributions in this series to chart the properties of the Galactic
acceleration field on ∼100pc to ∼100kpc scales.
Description:
To measure the radial velocities and metallicities of our Gaia DR2
sample presented in Section 2 we secured 75 hours of service-mode
observation with the CFHT/ESPaDOnS instrument over five semesters
between 2018 and 2020 (R=68000; wavelength range 3700-10500Å).
A total of 163 stars were observed with ESPaDOnS up to the end of
2020 June.
A further six nights of observation were obtained with the VLT/UVES
spectrograph, in 2019 June 3 and in 2020 January 3 (R∼40000;
3730-4990Å and 5650-9460Å.
We secured two six-night runs with NTT/EFOSC2 immediately before each
UVES run (R∼3000; 4400-5100Å).
A total of 60 stars of the stream sample have an EFOSC2 velocity
measurement but no UVES velocity measurement.
We complemented these velocities with measurements taken from public
spectroscopic surveys. A total of 685 stars from our sample of
5960 stream candidate stars (i.e., 11.5%) end up having velocity
measurements.
See Section 3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 5960 *The STREAMFINDER catalog of 5960 stars detected
in Gaia DR2, with updated EDR3 astrometry
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Note on table1.dat: The STREAMFINDER (Malhan & Ibata 2018MNRAS.477.4063M 2018MNRAS.477.4063M)
algorithm was designed to hunt for stream-like overdensities in
photometric and astrometric catalogs. See Section 2.
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See also:
III/279 : RAVE 5th data release (Kunder+, 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/ApJ/722/1373 : ω Centauri giants abundances (Johnson+, 2010)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/MNRAS/426/1137 : Radial velocities in NGC 1851 (Sollima+, 2012)
J/A+A/588/A148 : NGC 6397 stars MUSE spectra (Husser+, 2016)
J/ApJ/819/1 : Wide-field photometry of the GC Palomar 5 (Ibata+, 2016)
J/ApJ/842/120 : Large sp. survey of Palomar 5 stellar stream (Ibata+, 2017)
J/ApJ/853/86 : HST large prog. on ω Centauri. II. (Bellini+, 2018)
J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)
J/MNRAS/484/2832 : Proper motions of MW globular clusters (Vasiliev, 2019)
J/ApJ/901/23 : Gjoll stream stars & abund. of 4 members (Hansen+, 2020)
J/A+A/645/A116 : NGC 2808, NGC 6266 & NGC 6397 GaiaDR2 sources (Kundu+, 2021)
J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)
http://www.cosmos.esa.int/gaia : Gaia home page
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- Gaia Gaia EDR3 star identifier
21- 31 F11.7 deg RAdeg Gaia EDR3 right ascension (J2000)
33- 43 F11.7 deg DEdeg [-81.84/84.61] Gaia EDR3 declination (J2000)
45- 50 F6.3 mas plx [-1.2/1.4] Gaia ER3 parallax
52- 58 F7.3 mas/yr pmRA [-28/24.6] Gaia EDR3 proper motion in RA,
µα(*cos(δ))
60- 66 F7.3 mas/yr pmDE [-40.5/25.2] Gaia EDR3 proper motion in DEC
68- 73 F6.3 mag Gmag0 [10.3/19.5] Gaia DR2 extinction-corrected
magnitude G0
75- 79 F5.3 mag (BP-RP)0 [0.5/1.6] Gaia DR2 color (GBP-GRP)0
81- 84 F4.1 kpc dSF [1/45.6] Distance to the star estimated by
STREAMFINDER
86- 93 F8.2 km/s HRV [-3838/16857]?=1000 Best heliocentric
line-of-sight velocity
95- 102 F8.2 km/s e_HRV [0.02/63]?=10000 HRV uncertainty
104- 105 I2 --- r_HRV [0/13] Reference for the velocity (1)
107- 108 I2 --- Stream [1/32] A unique stream identification label;
used in Figures 1-3
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Note (1): Heliocentric line-of-sight velocity source as follows:
0 = No measurement (5275 occurrences)
1 = APOGEE-2 (Majewski+ 2017AJ....154...94M 2017AJ....154...94M ; see III/284); 15 occurrences
2 = GALAH DR3 survey (Buder+ 2018, J/MNRAS/478/4513); 1 occurrence
3 = Gaia Radial Velocity Spectrometer (RVS) catalog; 6 occurrences
4 = LAMOST DR5 survey (Cui+ 2012RAA....12.1197C 2012RAA....12.1197C ; see V/164); 44 occurrences
5 = Radial Velocity Experiment (RAVE DR5; Kunder+ 2017, III/279); not used
6 = SDSS/Segue survey (Yanny+ 2009, J/AJ/137/4377); 135 occurrences
7 = BOSS; 86 occurrences
8 = CFHT/ESPaDOnS (this work); 155 occurrences
9 = AAT/AAOmega (from Ibata+ 2017, J/ApJ/842/120); 5 occurrences
10 = VLT/FLAMES (from Ibata+ 2017, J/ApJ/842/120); 7 occurrences
11 = VLT/UVES (from Odenkirchen+ 2009AJ....137.3378O 2009AJ....137.3378O); 6 occurrences
12 = NTT/EFOSC (this work); 44 occurrences
13 = VLT/UVES (this work); 181 occurrences
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 14-Dec-2022