J/ApJ/871/33 BVI photometric catalog of star clusters in NGC4589 (Lee+, 2019)
Star clusters in the elliptical galaxy NGC4589 hosting a calcium-rich
SNIb (SN2005cz).
Lee M.G., Jang In S., Kang J.
<Astrophys. J., 871, 33 (2019)>
=2019ApJ...871...33L 2019ApJ...871...33L
ADC_Keywords: Clusters, globular; Colors; Photometry, UBVRI; Supernovae
Keywords: galaxies: distances and redshifts ;
galaxies: elliptical and lenticular, cD ;
galaxies: individual (NGC 4589) ; galaxies: star clusters: general ;
ISM: supernova remnants
Abstract:
NGC4589, a bright E2 merger-remnant galaxy, hosts the peculiar fast
and faint calcium-rich supernova SNIb SN2005cz. The progenitor of
Ca-rich SNeIb has been controversial: it could be (1) a young, massive
star with 6-12M☉ in a binary system, or (2) an old, low-mass star
in a binary system that was kicked out from the galaxy center.
Moreover, previous distance estimates for this galaxy have shown a
large spread, ranging from 20 to 60Mpc. Thus, using archival Hubble
Space Telescope/Advanced Camera for Surveys (HST/ACS) F435W, F555W,
and F814W images, we search for star clusters in NGC4589 in order to
help resolve these issues. We find a small population of young star
clusters with 25<V≤27(-7.1<MV←5.1)mag and age <1Gyr in the central
region at R<0.5' (<3.8kpc), thus supporting the massive-star
progenitor scenario for SN2005cz. In addition to young star clusters,
we also find a large population of old globular clusters. In contrast
to previous results in the literature, we find that the color
distribution of the globular clusters is clearly bimodal. The turnover
(Vega) magnitude in the V-band luminosity functions of the blue
(metal-poor) globular clusters is determined to be
V0(max)=24.40±0.10mag. We derive the total number of globular
clusters, NGC=640±50, and the specific frequency,
SN=1.7±0.2. Adopting a calibration for the metal-poor globular
clusters, MV(max) =-7.66±0.14mag, we derive a distance to this
galaxy: (m-M)0=32.06±0.10(ran)±0.15(sys)
(d=25.8±2.2Mpc).
Description:
We used Advanced Camera for Surveys (ACS) images for NGC4589 from the
Hubble Space Telescope (HST) archive (PI: Smartt, ID: 10498 --
observations from November 2006). The exposure times are 1500s for
F435W, 1500s for F555W, and 1600s for F814W. We combined individual
images of NGC4589 within the same filter using AstroDrizzle. The image
scale of the combined images is 0.05" per pixel.
Before selecting star cluster candidates in the list of the detected
sources, we visually inspected the images of all detected sources with
V(total)≤27mag and removed artifacts, blended sources, and sources
with irregular morphology. Visual inspection of the images becomes
difficult for the fainter sources. We selected 745 out of 2973
inspected sources.
Objects:
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RA (ICRS) DE Designation(s) Dist (Mpc)
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12 37 25.0 +74 11 31 NGC 4589 = LEDA 42139 (D=25.8)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 745 *A BVI photometric calatog of the star clusters
with V≤27mag in NGC4589
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Note on table2.dat: The instrumental magnitudes in the HST system were
converted to the standard calibrated BVI magnitudes in the
Johnson-Cousins system using the information in Sirianni+
(2005PASP..117.1049S 2005PASP..117.1049S). The photometric zero points (c0) and color
terms (c1) we used are as follows: c0=25.842 and c1=-0.089 for F435W,
c0=25.704 and c1=-0.054 for F555W, and c0=25.495 and c1=-0.002 for
F814W. Transformation uncertainties are estimated to be ±0.02mag in
each band.
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
VII/84 : Groups of Galaxies. III. The CfA Survey (Geller+ 1983)
VII/176 : Photometry and Spectroscopy of Elliptical Galaxies (Faber+ 1989)
VII/195 : Globular Clusters in the Milky Way (Harris, 1996)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/A+AS/139/393 : Young Massive Star Clusters. II. (Larsen, 1999)
J/A+AS/141/371 : Low-mass stars evolution. tracks & isochrones (Girardi+,2000)
J/ApJS/150/367 : Globular clusters in NGC 5128 (Peng+, 2004)
J/MNRAS/365/1357 : Absolute magnitude Globular Cluster (Di Criscienzo+, 2006)
J/ApJ/671/1624 : NGC 1533 globular cluster candidates (Degraaff+, 2007)
J/ApJS/171/101 : Globular clusters in ACS Virgo cluster survey (Jordan+,2007)
J/A+A/465/71 : 21cm observations of 452 galaxies (Theureau+, 2007)
J/MNRAS/403/429 : Candidate globular clusters in NGC 5170 (Forbes+, 2010)
J/MNRAS/417/1823 : Sombrero galaxy globular clusters (Alves-Brito+, 2011)
J/A+A/543/A131 : NGC1316 globular cluster photometry (Richtler+, 2012)
J/AJ/143/84 : New candidate globular clusters in NGC 5128 (Harris+, 2012)
J/ApJ/750/140 : Candidate globular clusters in NGC 1316 (Goudfrooij, 2012)
J/ApJ/772/82 : A catalog of globular cluster systems (Harris+, 2013)
J/AJ/146/86 : Cosmicflows-2 catalog (Tully+, 2013)
J/AJ/148/32 : Globular cluster candidates in NGC 3115 (Jennings+, 2014)
J/ApJ/835/184 : Globular cluster in NGC4258 (Gonzalez-Lopezlira+, 2017)
J/ApJ/836/60 : Bgri light curves of PTF11kmb and PTF12bho (Lunnan+, 2017)
J/A+A/611/A21 : Globular cluster candidates in NGC253 (Cantiello+, 2018)
J/MNRAS/485/3042 : UBVRI photometry in 48 globular clusters (Stetson+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/745] Identification number
5- 14 F10.6 deg RAdeg [189.25/189.54] Right Ascension (J2000)
16- 24 F9.6 deg DEdeg [74.14/74.22] Declination (J2000)
26- 31 F6.3 mag Vmag [20/27] Apparent V band magnitude
33- 37 F5.3 mag e_Vmag [0.004/0.59] Uncertainty in Vmag
39- 44 F6.3 mag B-V [-0.17/4.4] The (B-V) color index
46- 50 F5.3 mag e_B-V [0.006/8.3] Uncertainty in B-V
52- 56 F5.3 mag V-I [0.14/3.6] The (V-I) color index
58- 62 F5.3 mag e_V-I [0.004/0.46] Uncertainty in V-I
64- 68 F5.2 pc Reff [0.02/23]? Effective radius
70- 74 F5.2 pc e_Reff [0.05/15]? Uncertainty in Reff
76- 80 F5.3 --- C [0.25/0.98] Concentration parameter from F814W
image
82- 83 A2 --- Flag [GC] Globular cluster candidate
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS] 17-Feb-2020