J/AJ/138/332 LEDA CMD/tip of the red giant branch (Jacobs+, 2009)
The Extragalactic Distance Database: color-magnitude diagrams.
Jacobs B.A., Rizzi L., Tully R.B., Shaya E.J., Makarov D.I., Makarova L.
<Astron. J., 138, 332-337 (2009)>
=2009AJ....138..332J 2009AJ....138..332J
ADC_Keywords: Galaxies, nearby ; Galaxies, photometry
Keywords: astronomical data bases: miscellaneous - catalogs -
galaxies: distances and redshifts - galaxies: photometry -
galaxies: stellar content
Abstract:
The color-magnitude diagrams/tip of the red giant branch (CMDs/TRGB)
section of the Extragalactic Distance Database contains a compilation
of observations of nearby galaxies from the Hubble Space Telescope.
Approximately 250 (and increasing) galaxies in the Local Volume have
CMDs and the stellar photometry tables used to produce them available
through the Web. Various stellar populations that make up a galaxy are
visible in the CMDs, but our primary purpose for collecting and
analyzing these galaxy images is to measure the TRGB in each. We can
estimate the distance to a galaxy by using stars at the TRGB as
standard candles. In this paper, we describe the process of
constructing the CMDs and make the results available to the public.
Description:
The CMDs are produced by performing photometry on HST images taken
with either the Wide-Field Planetary Camera 2 (WFPC2) or the Advanced
Camera for Surveys (ACS). The HST flight filter most appropriate for
locating the TRGB is F814W, which can be described as "wide I." In
order to discriminate between the RGB and other star types we require
observations in another filter. Either of the V-equivalent filters:
F606W and F555W most commonly serve this purpose, but it is possible
to use one of the B-like filters such as F475W as well.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 136 165 CMD/TRGB catalog (color-magnitude diagrams/tip
of the red giant branch section of the
Extragalactic Distance Database (EDD))
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See also:
VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)
http://leda.univ-lyon1.fr/ : LEDA Home Page
http://edd.ifa.hawaii.edu/ : The Extragalactic Distance Database (EDD)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- PGC Principal Galaxy Catalog number
10- 19 A10 --- Name Galaxy name
21- 25 I5 --- GO HST observing program number
27- 31 A5 --- Camera HST camera used (ACS or WFPC2)
33- 37 F5.2 mag F814 The F814W band TRGB magnitude
39- 43 F5.2 mag b_F814 The 68% lower limit on F814
45- 49 F5.2 mag B_F814 The 68% upper limit on F814
51- 54 F4.2 mag F606-F814 ? The TRGB (F606W-F814W) color index
56- 59 F4.2 mag b_F606-F814 ? The 68% lower limit on F606-F814
61- 64 F4.2 mag B_F606-F814 ? The 68% upper limit on F606-F814
66- 69 F4.2 mag F555-F814 ? The TRGB (F555W-F814W) color index
71- 74 F4.2 mag b_F555-F814 ? The 68% lower limit on F555-F814
76- 79 F4.2 mag B_F555-F814 ? The 68% upper limit on F555-F814
81- 85 F5.2 mag Icmag The Cousins I band TRGB magnitude
87- 91 F5.2 mag b_Icmag The 68% lower limit on Icmag
93- 97 F5.2 mag B_Icmag The 68% upper limit on Icmag
99-102 F4.2 mag V-Ic The TRGB Johnson-Cousins (V-I) color index
104-107 F4.2 mag b_V-Ic The 68% lower limit on V-Ic
109-112 F4.2 mag B_V-Ic The 68% upper limit on V-Ic
114-118 F5.3 mag E(B-V) The E(B-V) reddening
120-124 F5.2 mag DM Distance modulus
126-130 F5.2 mag b_DM The 68% lower limit on DM
132-136 F5.2 mag B_DM The 68% upper limit on DM
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 29-Nov-2011