J/A+A/584/A2 KMOS view of the Galactic centre. I. (Feldmeier-Krause+, 2015)
KMOS view of the Galactic centre. I: Young stars are centrally concentrated.
Feldmeier-Krause A., Neumayer N., Schoedel R., Seth A., Hilker M.,
de Zeeuw P.T., Kuntschner H., Walcher C.J., Luetzgendorf N.,
Kissler-Patig M.
<Astron. Astrophys. 584, A2 (2015)>
=2015A&A...584A...2F 2015A&A...584A...2F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, early-type; Stars, emission;
Stars, Wolf-Rayet; Radial velocities; Spectra, infrared
Keywords: Galaxy: center - stars: early-type - stars: emission-line -
stars: Wolf-Rayet
Abstract:
The Galactic centre hosts a crowded, dense nuclear star cluster with a
half-light radius of 4pc. Most of the stars in the Galactic centre
are cool late-type stars, but there are also ≥100 hot early-type
stars in the central parsec of the Milky Way. These stars are only
3-8Myr old. Our knowledge of the number and distribution of early-type
stars in the Galactic centre is incomplete. Only a few spectroscopic
observations have been made beyond a projected distance of 0.5pc of
the Galactic centre. The distribution and kinematics of early-type
stars are essential to understand the formation and growth of the
nuclear star cluster.
Description:
We used the near-infrared spectrograph KMOS (VLT) to observe the
central ∼2.5pcx1.7pc of our Galaxy along the Galactic plane in the
K-band with R∼4200.
We extracted spectra from individual stars and identified early-type
stars. Here we present table B1, B2 and B3 from the Appendix B. We
include the spectra of 76 O/B type stars, 23 Wolf-Rayet stars, six
narrow-emission line stars, and nine featureless spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 73 29 Emission-line and Wolf-Rayet stars
table3.dat 80 9 Stars with featureless spectra
tableb1.dat 97 76 List of O/B stars I: coordinates and types
tableb2.dat 62 76 List of O/B stars II:
Ks-magnitude, mass and equivalent width
tableb3.dat 54 76 List of O/B stars III: kinematics
sp/* . 114 Individual spectra
spectra.fits 2880 906 Spectra as fits file
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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- 5 I05 --- ID Identification number
7- 15 F9.5 deg RAdeg Right ascension (J2000)
17- 26 F10.6 deg DEdeg Declination (J2000)
28- 30 A3 --- Colour Indication on colour
32- 51 A20 --- Name Star name
53- 62 A10 --- SpType Spectral type
63 A1 --- n_SpType [abc] Note on classification (1)
65- 67 A3 --- PGM2006 PGM2006 refers to the nomenclature of
Paumard et al. (2006ApJ...643.1011P 2006ApJ...643.1011P)
(ENN, [PGM2006] ENN in Simbad)
69- 73 F5.1 --- S/N Signal-to-noise
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Note (1): Notes as follows:
a = Spectral classification from this work
b = Spectral type from Paumard et al. (2006, Cat. J/ApJ/643/1011)
c = Spectral type from Blum et al. (2003, Cat. J/ApJ/597/323)
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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- 5 I05 --- ID Identification number
7- 15 F9.5 deg RAdeg Right ascension (J2000)
17- 26 F10.6 deg DEdeg Declination (J2000)
28- 33 F6.3 mag Ksmag ?=- Ks magnitude from Schodel et al.
(2010A&A...511A..18S 2010A&A...511A..18S), if available
35- 37 A3 --- Colour Indication on colour
39- 51 A13 --- Name Star name
53- 58 A6 --- SpType Spectral type
59 A1 --- r_SpType [bcefg] Reference for SpType (1)
60 A1 --- --- [/]
61- 63 A3 --- SpType2 Second spectral type
64 A1 --- r_SpType2 [df] Reference for SpType2 (1)
66- 70 F5.1 --- S/N Signal-to-noise
72- 80 A9 --- Loc Location
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Note (1): References as follows:
b = Spectral type from Paumard et al. (2006, Cat. J/ApJ/643/1011)
c = Spectral type from Horrobin et al. (2004AN....325...88H 2004AN....325...88H)
d = Spectral type from Pott et al. (2005Msngr.119...43P 2005Msngr.119...43P)
e = Spectral type from Geballe et al. (2006ApJ...652..370G 2006ApJ...652..370G)
f = Spectral type from Tanner et al. (2005ApJ...624..742T 2005ApJ...624..742T),
Sanchez-Bermudez et al. (2014A&A...567A..21S 2014A&A...567A..21S)
g = Spectral type from Perger et al. (2008A&A...478..127P 2008A&A...478..127P)
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 5 I05 --- ID Identification number
7- 15 F9.5 deg RAdeg Right ascension (J2000)
17- 26 F10.6 deg DEdeg Declination (J2000)
28- 34 F7.3 arcsec oRA Right ascension offset to Sgr A* (3)
36- 42 F7.3 arcsec oDE Declination offset to Sgr A* (3)
44- 48 F5.2 mag Kmag ?=- Ks-band magnitude (4)
50- 51 A2 --- Colour [fg ?] Note on H-Ks colour (1)
53- 75 A23 --- Name Star name
77- 85 A9 --- SpType Spectral type
87- 91 A5 --- n_SpType Note on classification (2)
93- 97 F5.1 --- SN Signal-to-noise
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Note (1): fg denotes a probable foreground star.
Note (2): Note on classification as follows:
1 = First spectroscopic classification reported in this work;
2 = Spectral type from Paumard et al., 2006ApJ...643.1011P 2006ApJ...643.1011P, Cat. J/ApJ/643/1011
3 = Spectral type from Bartko et al., 2009ApJ...697.1741B 2009ApJ...697.1741B, Cat. J/ApJ/697/1741
4 = Spectral type from Do et al., 2013ApJ...764..154D 2013ApJ...764..154D, Cat. J/ApJ/764/154
5 = Photometric early-type candidate from Nishiyama & Schoedel,
2013A&A...549A..57N 2013A&A...549A..57N, Cat. J/A+A/549/A57
6 = Classified as early-type star by Stostad et al., 2015ApJ...808..106S 2015ApJ...808..106S
7 = Early-type star candidate from Feldmeier et al., 2014A&A...570A...2F 2014A&A...570A...2F,
Cat. J/A+A/570/A2
8 = Classified as early-type star by Perger et al., 2008A&A...478..127P 2008A&A...478..127P
Note (3): Assuming Sgr A* is located at RA=266.41684, DE=-29.00781056 (J2000).
Note (4): Extinction corrected with map from Schoedel et al.
(2010A&A...511A..18S 2010A&A...511A..18S, Cat. J/A+A/511/A18) shifted to AKs=2.70.
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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1- 5 I05 --- ID Identification number
7- 11 F5.2 mag Ks0m ?=- Ks-band magnitude, extinction corrected (5)
13- 16 F4.2 mag AKsm ?=- Extinction in Ks-band (5)
18- 22 F5.2 mag Ks0i ?=- Ks-band magnitude, extinction corrected (6)
25- 28 F4.2 mag e_Ks0i ?=- Ks-band magnitude uncertainty (6)
31- 34 F4.2 mag AKsi ?=- Extinction in Ks-band (6)
37- 40 F4.2 mag e_AKsi ?=- Uncertainty of extinction in Ks-band (6)
43- 44 I2 Msun Mass ?=- stellar mass (7)
47- 48 I2 Msun E_Mass ?=- Upper uncertainty of stellar mass (7)
51- 52 I2 Msun e_Mass ?=- Lower uncertainty of stellar mass (7)
54- 57 F4.1 --- EWCO Equivalent width of CO
59- 62 F4.1 --- EWNa Equivalent width of Na
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Note (5): Extinction from Schoedel et al. (2010A&A...511A..18S 2010A&A...511A..18S, J/A+A/511/A18).
Note (6): Extinction from intrinsic colour.
Note (7): Mass derived using isochrones with 3-8Myr age, solar metallicity.
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Byte-by-byte Description of file: tableb3.dat
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Bytes Format Units Label Explanations
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1- 5 I05 --- ID Identification number
7- 12 F6.2 arcsec p Projected distance to Sgr A* (8)
14- 17 I4 km/s pmRA ?=- Proper motion in Right Ascension (9)
21- 22 I2 km/s e_pmRA ?=- uncertainty of pmRA (9)
24- 27 I4 km/s pmDE ?=- Proper motion in Declination (9)
30- 32 I3 km/s e_pmDE ?=- uncertainty of pmDE (9)
34 A1 --- r_pm [ab] Reference for proper motions (10)
36- 39 I4 km/s RV ?=- Radial velocity
42- 44 I3 km/s e_RV ?=- uncertainty of RVel
46 A1 --- r_RV [cdef] Reference for radial velocity (11)
48 I1 --- Note [0/1]? Disk membership (12)
50- 54 F5.2 --- h ?=- normalised projected angular momentum
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Note (8): Assuming Sgr A* is located at RA=266.41684, DE=-29.00781056 (J2000).
Note (9): Assuming a Galactocentric distance of 8kpc.
Note (10): Reference for proper motions as follows:
a = Schoedel et al. (2009A&A...502...91S 2009A&A...502...91S, Cat. J/A+A/502/91)
b = Yelda et al. (2014ApJ...783..131Y 2014ApJ...783..131Y)
Note (11): Reference for radial velocity as follows:
c = this work
d = Error-weighted mean from Bartko et al. (2009ApJ...697.1741B 2009ApJ...697.1741B) and
Yelda et al. (2014ApJ...783..131Y 2014ApJ...783..131Y)
e = Bartko et al. (2009ApJ...697.1741B 2009ApJ...697.1741B, J/ApJ/697/1741)
f = Yelda et al. (2014ApJ...783..131Y 2014ApJ...783..131Y)
Note (12): Disk membership excluded if 0, possible if 1 (based on v_z)
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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3- 11 F9.3 0.1nm lambda Wavelength
17- 26 F10.3 --- Flux ?=- Flux
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Acknowledgements:
Anja Feldmeier-Krause, afeldmei(at)eso.org
(End) Patricia Vannier [CDS] 25-Sep-2015