J/MNRAS/415/3393 Stars and globulars in NGC4494 (Foster+, 2011)
Global properties of 'ordinary' early-type galaxies: photometry and spectroscopy
of stars and globular clusters in NGC 4494.
Foster C., Spitler L.R., Romanowsky A.J., Forbes D.A., Pota V., Bekki K.,
Strader J., Proctor R.N., Arnold J.A., Brodie J.P.
<Mon. Not. R. Astron. Soc., 415, 3393-3416 (2011)>
=2011MNRAS.415.3393F 2011MNRAS.415.3393F
ADC_Keywords: Galaxies, photometry ; Photometry, SDSS ; Photometry, HST ;
Clusters, globular ; Associations, stellar ; Spectroscopy ;
Radial velocities
Keywords: galaxies: abundances - galaxies: haloes -
galaxies: individual: NGC 4494 - galaxies: kinematics and dynamics -
galaxies: star clusters: general
Abstract:
We present a comprehensive analysis of the spatial, kinematic and
chemical properties of stars and globular clusters (GCs) in the
'ordinary' elliptical galaxy NGC 4494 using data from the Keck and
Subaru telescopes. We derive galaxy surface brightness and colour
profiles out to large galactocentric radii. We compare the latter to
metallicities derived using the near-infrared Calcium Triplet. We
obtain stellar kinematics out to ∼3.5 effective radii.
Description:
Subaru Suprime-Cam imaging of NGC 4494 is analysed to understand the
GC system and light profiles of NGC 4494. We obtained a g-band
observation of NGC 4494 during a Gemini time exchange program
(GN-2008A-C-12) on the night of 2008 April 2. Two additional bands (r
and i bands) were acquired on a later date, 2010 April 4, through the
Keck time exchange.
Spectra were obtained as part of the Spectroscopic Mapping of
Early-Type Galaxies to Their Outer Limits (SMEAGOL) survey on two
separate dark nights: 2008 April 8 and 2009 March 23 using the DEIMOS
on the Keck telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 92 115 Individual values for NGC 4494 galaxy light
tablea2.dat 100 117 Individual spectroscopically confirmed globular
clusters and Ultra-Compact Dwarfs around NGC 4494
table3.dat 89 431 Catalog of photometrically selected globular
cluster candidates with i0<24
table4.dat 78 143 List of spectroscopically identified
contaminants and non-globular cluster fillers
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Individual slit right ascension (J2000)
4- 5 I2 min RAm Individual slit right ascension (J2000)
7- 11 F5.2 s RAs Individual slit right ascension (J2000)
13 A1 --- DE- Individual slit declination sign (J2000)
14- 15 I2 deg DEd Individual slit declination (J2000)
17- 18 I2 arcmin DEm Individual slit declination (J2000)
20- 24 F5.2 arcsec DEs Individual slit declination (J2000)
26- 31 F6.1 km/s Vobs ? Observed recession velocity
33- 36 F4.1 km/s e_Vobs ? rms uncertainty on Vobs
38- 42 F5.1 km/s sigma Velocity dispersion
44- 47 F4.1 km/s e_sigma rms uncertainty on sigma
49- 53 F5.2 --- h3 Gauss-Hermite coefficient h3
55- 58 F4.2 --- e_h3 rms uncertainty on h3
60- 64 F5.2 --- h4 Gauss-Hermite coefficient h4
66- 69 F4.2 --- e_h4 rms uncertainty on h4
71- 74 F4.2 0.1nm CaT ? CaT index measured with the method of
Foster et al., 2009MNRAS.400.2135F 2009MNRAS.400.2135F
76- 79 F4.2 0.1nm e_CaT ? rms uncertainty on CaT
81- 82 A2 --- l_[Fe/H] [≥ ] Limit flag on [Fe/H] (1)
83- 87 F5.2 [Sun] [Fe/H] ? Metallicity
89- 92 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H] (G1)
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Note (1): We quote the maximum metallicity (i.e. [Fe/H]=+0.2) when the
measured CaT is higher than the metallicity range available in the
Vazdekis et al., 2003MNRAS.340.1317V 2003MNRAS.340.1317V models.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- ID Source designation (UCDN or GCNNN)
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 18 F6.3 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 31 F5.2 arcsec DEs Declination (J2000)
33- 37 F5.2 mag g0mag Dereddened Subaru/Suprime-Cam g magnitude
39- 43 F5.2 mag r0mag Dereddened Subaru/Suprime-Cam r magnitude
45- 49 F5.2 mag i0mag Dereddened Subaru/Suprime-Cam i magnitude
51- 54 F4.2 mag (g-i)0 Dereddened Subaru/Suprime-Cam g-i colour index
56- 60 F5.2 mag V0mag ?=- Dereddened HST/WFPC2 V magnitude
62- 66 F5.2 mag I0mag ?=- Dereddened HST/WFPC2 I magnitude
68- 71 F4.2 mag (V-I)0 ?=- Dereddened HST/WFPC2 V-I colour index
73- 76 I4 km/s Vobs ? Observed recession velocity
78- 79 I2 km/s e_Vobs ? rms uncertainty on Vobs
81- 84 F4.2 0.1nm CaT ? CaT index measured with the method of
Foster et al., 2009MNRAS.400.2135F 2009MNRAS.400.2135F
86- 89 F4.2 0.1nm e_CaT ? rms uncertainty on CaT
91- 95 F5.2 [Sun] [Fe/H] ? Metallicity
97-100 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H] (G1)
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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- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 24 F5.2 arcsec DEs Declination (J2000)
26- 31 F6.3 mag g0mag ?=- Dereddened Subaru/Suprime-Cam g magnitude
33- 37 F5.3 mag e_g0mag ?=- rms uncertainty on g0mag
39- 44 F6.3 mag r0mag ?=- Dereddened Subaru/Suprime-Cam r magnitude
46- 50 F5.3 mag e_r0mag ?=- rms uncertainty on r0mag
52- 57 F6.3 mag i0mag ?=- Dereddened Subaru/Suprime-Cam i magnitude
59- 63 F5.3 mag e_i0mag ?=- rms uncertainty on i0mag
65- 70 F6.3 mag V0mag ?=- Dereddened HST/WFPC2 V magnitude
72- 76 F5.3 mag e_V0mag ?=- rms uncertainty on V0mag
78- 83 F6.3 mag I0mag ?=- Dereddened HST/WFPC2 I magnitude
85- 89 F5.3 mag e_I0mag ?=- rms uncertainty on I0mag
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 24 F5.2 arcsec DEs Declination (J2000)
26- 31 F6.3 mag g0mag ?=- Dereddened Subaru/Suprime-Cam g magnitude
33- 37 F5.3 mag e_g0mag ?=- rms uncertainty on g0mag
39- 44 F6.3 mag r0mag ?=- Dereddened Subaru/Suprime-Cam r magnitude
46- 50 F5.3 mag e_r0mag ?=- rms uncertainty on r0mag
52- 57 F6.3 mag i0mag ?=- Dereddened Subaru/Suprime-Cam i magnitude
59- 63 F5.3 mag e_i0mag ?=- rms uncertainty on i0mag
65- 68 I4 km/s Vobs ? Observed recession velocity
70- 71 I2 km/s e_Vobs ? rms uncertainty on Vobs
73- 78 A6 --- Type Type of contaminant: galaxy, star or M star
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Global notes:
Note (G1): The errors on the quoted [Fe/H] values are based on the index
errors only and do not include possible systematics due to the adopted
calibration.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Apr-2012