1999ApJ...516..626G

Query : 1999ApJ...516..626G

1999ApJ...516..626G - Astrophys. J., 516, 626-646 (1999/May-2)

The Hubble space telescope key project on the extragalactic distance scale. XX. The discovery of cepheids in the Virgo cluster galaxy NGC 4548.

GRAHAM J.A., FERRARESE L., FREEDMAN W.L., KENNICUTT R.C.Jr, MOULD J.R., SAHA A., STETSON P.B., MADORE B.F., BRESOLIN F., FORD H.C., GIBSON B.K., HAN M., HOESSEL J.G., HUCHRA J., HUGHES S.M., ILLINGWORTH G.D., KELSON D.D., MACRI L., PHELPS R., SAKAI S., SILBERMANN N.A. and TURNER A.

Abstract (from CDS):

We report on the discovery and properties of Cepheid variable stars in the barred spiral galaxy NGC 4548, which is a member of the Virgo cluster of galaxies. This is one of the galaxies being observed as part of the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale, which aims to determine the Hubble constant to 10% accuracy. Our analysis is based on observations made with the Wide Field and Planetary Camera 2 during 1996 and 1997. We identify 24 probable Cepheids with periods between 16 and 38 days. They were observed over 13 epochs with the F555W filter and eight epochs with the F814W filter. The HST F555W and F814W data have been transformed to the Johnson V and Cousins I magnitude systems, respectively. Photometry has principally been carried out using the DAOPHOT/ALLFRAME package. A comparison is made with parallel measurements using the DoPHOT package. Apparent period-luminosity relations for V and I have been constructed. Assuming values of µ0=18.50±0.10 mag and E(B-V)=0.10 mag for the distance modulus and reddening of the Large Magellanic Cloud, a true distance modulus of 31.01±0.28 mag is derived corresponding to a distance of 15.9±2.0 Mpc. HST Cepheid distances of other spiral galaxies in the Virgo Cluster are discussed. Their good agreement with the new NGC 4548 distance strengthens the evidence that this galaxy lies within the Virgo cluster core.

Abstract Copyright: ∼

Journal keyword(s): Stars: Variables: Cepheids - Cosmology: Distance Scale - Galaxies: Clusters: Individual: Name: Virgo - Galaxies: Individual: NGC Number: NGC 4548

Nomenclature: Table 3: [GFF99] N-NN N=30. Table 5: [GFF99] CNN (Nos C1-C24). Table 8: [GFF99] VNN (Nos V1-V11).

Simbad objects: 73

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Number of rows : 73
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1238 2
2 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1963 2
3 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
4 NGC 4496 GiP 12 31 39.2222392512 +03 56 21.641352828   11.71       ~ 376 0
5 NGC 4535 H2G 12 34 20.3443516704 +08 11 51.908488116   11.1       ~ 679 0
6 NGC 4536 H2G 12 34 27.12887 +02 11 16.3680 11.14 11.16 10.55 17.393   ~ 913 3
7 [GFF99] V01 V* 12 35 23.64 +14 29 02.2           ~ 1 0
8 [GFF99] V02 V* 12 35 23.65 +14 29 05.7           ~ 1 0
9 [GFF99] 3-5 * 12 35 23.72 +14 28 38.4           ~ 1 0
10 [GFF99] C01 Ce* 12 35 23.74 +14 28 33.0           ~ 2 0
11 [GFF99] C02 Ce* 12 35 23.96 +14 28 26.2           ~ 2 0
12 [GFF99] 3-4 * 12 35 23.98 +14 28 34.3           ~ 1 0
13 [GFF99] C03 Ce* 12 35 24.20 +14 28 36.7           ~ 2 0
14 [GFF99] C04 Ce* 12 35 24.75 +14 28 11.0           ~ 2 0
15 [GFF99] 3-2 * 12 35 25.09 +14 28 37.5           ~ 1 0
16 [GFF99] 3-3 * 12 35 25.30 +14 28 38.2           ~ 1 0
17 [GFF99] 3-1 * 12 35 25.33 +14 28 28.8           ~ 1 0
18 [GFF99] C05 Ce* 12 35 25.41 +14 28 03.1           ~ 2 0
19 [GFF99] C06 Ce* 12 35 25.65 +14 28 02.6           ~ 2 0
20 [GFF99] V03 V* 12 35 25.73 +14 28 02.9           ~ 1 0
21 [GFF99] 3-7 * 12 35 25.79 +14 29 05.7           ~ 1 0
22 [GFF99] 3-6 * 12 35 26.28 +14 28 53.6           ~ 1 0
23 [GFF99] V04 V* 12 35 26.37 +14 28 12.5           ~ 1 0
24 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 639 0
25 [GFF99] C07 Ce* 12 35 26.48 +14 28 53.8           ~ 2 0
26 [GFF99] V05 V* 12 35 26.55 +14 27 52.4           ~ 1 0
27 [GFF99] 2-8 * 12 35 26.56 +14 28 00.3           ~ 1 0
28 [GFF99] 2-6 * 12 35 26.85 +14 27 58.2           ~ 1 0
29 [GFF99] 2-7 * 12 35 26.86 +14 27 57.1           ~ 1 0
30 [GFF99] V06 V* 12 35 27.32 +14 28 54.4           ~ 1 0
31 [GFF99] C08 Ce* 12 35 27.37 +14 29 12.4           ~ 2 0
32 [GFF99] C09 Ce* 12 35 27.57 +14 28 52.3           ~ 2 0
33 [GFF99] 2-5 * 12 35 27.67 +14 28 00.2           ~ 1 0
34 [GFF99] C10 Ce* 12 35 28.10 +14 29 03.1           ~ 2 0
35 [GFF99] C11 Ce* 12 35 28.38 +14 28 57.5           ~ 2 0
36 [GFF99] C12 Ce* 12 35 28.45 +14 28 01.0           ~ 2 0
37 [GFF99] 2-4 * 12 35 28.52 +14 27 38.2           ~ 1 0
38 [GFF99] 2-1 * 12 35 28.54 +14 28 09.9           ~ 1 0
39 [GFF99] 2-3 * 12 35 28.55 +14 27 55.5           ~ 1 0
40 [GFF99] 2-2 * 12 35 28.90 +14 27 42.8           ~ 1 0
41 [GFF99] 4-1 * 12 35 29.13 +14 28 54.4           ~ 1 0
42 [GFF99] 1-2 * 12 35 29.73 +14 28 19.4           ~ 1 0
43 [GFF99] 1-1 * 12 35 29.76 +14 28 21.8           ~ 1 0
44 [GFF99] V07 V* 12 35 29.82 +14 28 17.8           ~ 1 0
45 [GFF99] C13 Ce* 12 35 29.91 +14 29 12.9           ~ 2 0
46 [GFF99] V08 V* 12 35 30.00 +14 28 06.0           ~ 1 0
47 [GFF99] C14 Ce* 12 35 30.00 +14 29 08.4           ~ 2 0
48 [GFF99] V09 V* 12 35 30.20 +14 28 10.4           ~ 1 0
49 [GFF99] C15 Ce* 12 35 30.23 +14 28 10.2           ~ 2 0
50 [GFF99] 4-2 * 12 35 30.31 +14 28 38.4           ~ 1 0
51 [GFF99] 1-3 * 12 35 30.53 +14 28 19.3           ~ 1 0
52 [GFF99] 4-4 * 12 35 30.58 +14 29 34.4           ~ 1 0
53 [GFF99] 4-3 * 12 35 30.62 +14 29 16.4           ~ 1 0
54 [GFF99] C16 Ce* 12 35 30.65 +14 28 19.2           ~ 2 0
55 [GFF99] 1-4 * 12 35 30.67 +14 28 12.5           ~ 1 0
56 [GFF99] C17 Ce* 12 35 30.90 +14 28 04.6           ~ 2 0
57 [GFF99] C18 Ce* 12 35 30.92 +14 28 07.4           ~ 2 0
58 [GFF99] V10 V* 12 35 31.04 +14 29 14.0           ~ 1 0
59 [GFF99] C19 Ce* 12 35 31.15 +14 28 59.9           ~ 2 0
60 [GFF99] 4-5 * 12 35 31.28 +14 28 55.9           ~ 1 0
61 [GFF99] C20 Ce* 12 35 31.35 +14 29 11.7           ~ 2 0
62 [GFF99] 4-6 * 12 35 31.46 +14 28 48.4           ~ 1 0
63 [GFF99] C21 Ce* 12 35 31.50 +14 29 08.1           ~ 2 0
64 [GFF99] 4-10 * 12 35 31.60 +14 29 47.8           ~ 1 0
65 [GFF99] 4-7 * 12 35 31.69 +14 28 54.6           ~ 1 0
66 [GFF99] 4-9 * 12 35 31.69 +14 29 10.1           ~ 1 0
67 [GFF99] V11 V* 12 35 31.78 +14 28 45.3           ~ 1 0
68 [GFF99] 4-8 * 12 35 31.83 +14 28 45.0           ~ 1 0
69 [GFF99] C22 Ce* 12 35 31.89 +14 29 35.0           ~ 2 0
70 [GFF99] 4-11 * 12 35 32.02 +14 29 47.3           ~ 1 0
71 [GFF99] C23 Ce* 12 35 33.19 +14 29 05.9           ~ 2 0
72 [GFF99] C24 Ce* 12 35 33.47 +14 29 06.1           ~ 2 0
73 NGC 4639 Sy1 12 42 52.3785000336 +13 15 26.706153600   13.62 12.72     ~ 642 0

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