J/MNRAS/458/105 SLUGGS NGC 3607 and 3608 globular clusters (Kartha+, 2016)
The SLUGGS survey: exploring the globular cluster systems of the Leo II group
and their global relationships.
Kartha S.S., Forbes D.A., Alabi A.B., Brodie J.P., Romanowsky A.J.,
Strader J., Spitler L.R., Jennings Z.G., Roediger J.C.
<Mon. Not. R. Astron. Soc., 458, 105-126 (2016)>
=2016MNRAS.458..105K 2016MNRAS.458..105K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, SDSS ;
Radial velocities
Keywords: galaxies: elliptical and lenticular, cD -
galaxies: individual: NGC 3605 - galaxies: individual: NGC 3607 -
galaxies: individual: NGC 3608 - galaxies: star clusters: individual
Abstract:
We present an investigation of the globular cluster (GC) systems of
NGC 3607 and NGC 3608 as part of the ongoing SLUGGS (SAGES Legacy
Unifying Globulars and GalaxieS) survey. We use wide-field imaging
data from the Subaru telescope in the g, r and i filters to analyse
the radial density, colour and azimuthal distributions of both GC
systems. With the complementary kinematic data obtained from the Keck
II telescope, we measure the radial velocities of a total of 81 GCs.
Our results show that the GC systems of NGC 3607 and NGC 3608 have a
detectable spatial extent of ∼15 and 13 galaxy effective radii,
respectively. Both GC systems show a clear bimodal colour
distribution. We detect a significant radial colour gradient for the
GC subpopulations in both galaxies. NGC 3607 exhibits an overabundance
of red GCs on the galaxy minor axis and NGC 3608 shows a misalignment
in the GC subpopulation position angles with respect to the galaxy
stellar component. With the aid of literature data, we discuss several
relationships between the properties of GC systems and their host
galaxies. A one-to-one relation between the ellipticities of red GCs
and the galaxy stellar light emphasizes the evolutionary similarities
between them. In our sample of four slowly rotating galaxies with
kinematically decoupled cores, we observe a higher ellipticity for the
blue GC subpopulation than their red counterparts. Also, we notice the
flattening of negative colour gradients for the blue GC subpopulations
with increasing galaxy stellar mass. Finally, we discuss the formation
scenarios associated with the blue GC subpopulation.
Description:
Photometric data for the Leo II group were obtained using the Subaru
Prime Focus Camera (Suprime-Cam) mounted on the 8m Subaru telescope.
The Suprime-Cam imager consists of 10 CCDs with individual sizes of
2048x4096 pixels and a pixel scale of 0.202-arcsec, covering a maximum
sky area of 34x27arcmin2. Wide-field images were obtained during
2011 January 3 and 4. The sky conditions were good with an average
seeing of ∼0.81, 0.80 and 0.80 for the g, r, i filters,
respectively. Multiple exposures in a dithered pattern were taken to
fill the gaps between individual CCDs. In g, r and i filters, the
total exposure times were 3743, 1560 and 1200s, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 83 108 Catalogue of objects detected around NGC 3607
and NGC 3608
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See also:
J/MNRAS/426/1475 : CaT in 903 globular clusters (Usher+, 2012)
J/MNRAS/428/389 : SLUGGS globular clusters in early-type galaxies (Pota+ 2013)
J/MNRAS/436/1172 : Globular Clusters of NGC 4278 in SLUGGS (Usher+, 2013)
J/AJ/148/32 : Globular cluster candidates in NGC 3115 (Jennings+, 2014)
J/MNRAS/450/1962 : M60 SLUGGS and Gemini/GMOS combined study (Pota+, 2015)
J/MNRAS/451/2625 : SLUGGS Globular Cluster CaT and [Z/H] (Pastorello+, 2015)
J/MNRAS/452/2208 : NGC 4473 globular clusters (Alabi+, 2015)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Name (1)
17- 26 F10.6 deg RAdeg Right ascension (J2000)
28- 36 F9.6 deg DEdeg Declination (J2000)
38- 43 F6.3 mag gmag Subaru/Suprime-Cam g magnitude
(extinction-corrected)
45- 49 F5.3 mag e_gmag rms uncertainty on gmag
51- 56 F6.3 mag rmag Subaru/Suprime-Cam r magnitude
(extinction-corrected)
58- 62 F5.3 mag e_rmag rms uncertainty on rmag
64- 69 F6.3 mag imag Subaru/Suprime-Cam i magnitude
(extinction-corrected)
71- 75 F5.3 mag e_imag rms uncertainty on imag
77- 80 I4 km/s HRV ?=- Heliocentric velocity
82- 83 I2 km/s e_HRV ?=- rms uncertainty on HRV
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Note (1): Object ID with the galaxy name followed by the object classification
such as GC, star and galaxy, i.e.
NGC NNNN_GCNN, NGC NNNN_starNN, NGC NNNN_galNN and NGC NNNN_extN.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Nov-2016