J/MNRAS/403/429 Candidate globular clusters in NGC 5170 (Forbes+, 2010)
A blue tilt in the globular cluster system of the Milky Way-like galaxy
NGC 5170.
Forbes D.A., Spitler L.R., Harris W.E., Bailin J., Strader J., Brodie J.P.,
Larsen S.S
<Mon. Not. R. Astron. Soc., 403, 429-438 (2010)>
=2010MNRAS.403..429F 2010MNRAS.403..429F
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, HST
Keywords: globular clusters: general - galaxies: individual: NGC 5170 -
galaxies: star clusters
Abstract:
Here, we present Hubble Space Telescope/Advanced Camera for Surveys
(ACS) imaging, in the B and I bands, of the edge-on Sb/Sc galaxy
NGC 5170. Excluding the central disc region, we detect 142 objects
with colours and sizes typical of globular clusters (GCs). Our main
result is the discovery of a "blue tilt" (a mass-metallicity
relation), at the 3σ level, in the metal-poor GC subpopulation
of this Milky Way like galaxy.
Description:
The data for this work were taken using the ACS/WFC camera on board
the HST as part of proposal ID 9766 (PI Forbes). Two pointings along
the major axis of NGC 5170 were obtained in the F435W (B) and F814W
(I) filters with a total exposure time of 3720 and 940s at each
pointing.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 142 Candidate GCs in NGC 5170
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Byte-by-byte Description of file: table1.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- 12 F6.3 s RAs Right ascension (J2000)
14 A1 --- DE- Declination sign (J2000)
15- 16 I2 deg DEd Declination (J2000)
18- 19 I2 arcmin DEm Declination (J2000)
21- 25 F5.2 arcsec DEs Declination (J2000)
27- 34 F8.3 pix Xpos X position
36- 43 F8.3 pix Ypos Y position
45- 50 F6.3 mag Bmag HST/ACS F435W (B) magnitude
52- 56 F5.3 mag e_Bmag rms uncertainty on Bmag
58- 63 F6.3 mag Imag HST/ACS F814W (I) magnitude
65- 69 F5.3 mag e_Imag rms uncertainty on Imag
71- 75 F5.3 mag B-I HST B-I colour index
77- 81 F5.3 mag e_B-I rms uncertainty on B-I
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Sep-2010