2013A&A...552A.106C


Query : 2013A&A...552A.106C

2013A&A...552A.106C - Astronomy and Astrophysics, volume 552A, 106-106 (2013/4-1)

The distance to NGC 1316 (Fornax A): yet another curious case.

CANTIELLO M., GRADO A., BLAKESLEE J.P., RAIMONDO G., DI RICO G., LIMATOLA L., BROCATO E., DELLA VALLE M. and GILMOZZI R.

Abstract (from CDS):

The distance of NGC1316, the brightest galaxy in the Fornax cluster, provides an interesting test for the cosmological distance scale. First, because Fornax is the second largest cluster of galaxies within ≲25Mpc after Virgo and, in contrast to Virgo, has a small line-of-sight depth; and second, because NGC1316 is the single galaxy with the largest number of detected Type Ia supernovae (SNe Ia), giving the opportunity to test the consistency of SNe Ia distances both internally and against other distance indicators. We measure surface brightness fluctuations (SBF) in NGC1316 from ground- and space-based imaging data. The sample provides a homogeneous set of measurements over a wide wavelength interval. The SBF magnitudes, coupled with empirical and theoretical absolute SBF calibrations, are used to estimate the distance to the galaxy. We also present the first B-band SBF measurements of NGC1316 and use them together with the optical and near-IR SBF data to analyze the properties of field stars in the galaxy. We obtain (m-M)=31.59±0.05(stat.)±0.14(sys.)mag, or d=20.8±0.5(stat.)±1.5(sys.)Mpc. When placed in a consistent Cepheid distance scale, our result agrees with the distances from other indicators. On the other hand, our distance is ∼17% larger than the most recent estimate based on SNe Ia. Possible explanations for this disagreement are the uncertain level of internal extinction, and/or calibration issues. Concerning the stellar population analysis, we confirm the results from other spectro-photometric indicators: the field stars in NGC1316 are dominated by a component with roughly solar metallicity and intermediate age. A non-negligible mismatch exists between B-band SBF models and data. We confirm that such behavior can be accounted for by an enhanced percentage of hot horizontal branch stars. Our study of the SBF distance to NGC1316, and the comparison with distances from other indicators, raises some concern about the homogeneity between the calibrations of different indicators. If not properly placed in the same reference scale, significant differences can occur, with dramatic impact on the cosmological distance ladder. Our results on the stellar populations properties show that SBF data over a broad wavelength interval are an efficient means of studying the properties of unresolved systems in peculiar cases like NGC1316.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: distances and redshifts - galaxies: clusters: individual: NGC 1316 - galaxies: photometry - galaxies: stellar content - galaxies: peculiar

VizieR on-line data: <Available at CDS (J/A+A/552/A106): list.dat fits/*>

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2154 2
2 NGC 821 AG? 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 572 0
3 NGC 936 EmG 02 27 37.462 -01 09 22.61   11.1   9.98 10.7 ~ 356 0
4 NGC 1201 EmG 03 04 07.9912913448 -26 04 10.874234136   11.78 10.64 10.35   ~ 145 0
5 SN 1981D SN* 03 22 39 -37 14.1   12.59 12.33     SNIa 96 1
6 SN 2006dd SN* 03 22 41.64 -37 12 13.2   14.5 15.0     SNIa 77 1
7 NGC 1316 BL? 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1387 1
8 SN 2006mr SN* 03 22 42.84 -37 12 28.5     15.6     SNIap 65 1
9 SN 1980N SN* 03 22 59 -37 12.8   12.5 12.37     SNIa 151 1
10 NGC 1340 GiG 03 28 19.6251763296 -31 04 05.435465520   11.20 10.32 9.70   ~ 214 1
11 SN 2012fr SN* 03 33 35.99 -36 07 37.7           SNIa-norm 145 1
12 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1798 2
13 NGC 1367 EmG 03 35 01.3451198496 -24 55 59.504904516   11.48   9.98 11.1 ~ 194 0
14 NGC 1380 Sy2 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 428 1
15 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1569 1
16 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 1819 0
17 NAME Eridanus ClG GrG 03 38 32.00 -22 18 51.0           ~ 174 0
18 NGC 3189 GiP 10 18 05.643 +21 49 54.98 12.60 12.12 11.15 11.14   ~ 399 2
19 NGC 3226 GiP 10 23 27.0064075320 +19 53 54.674937420   14.32 13.33     ~ 427 1
20 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 818 1
21 SN 1980D SN* 11 34 58.12 +54 52 54.7   14.6       SNIIP 21 1
22 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1762 2
23 NGC 4376 GiG 12 25 18.0159139968 +05 44 28.133108988   13.9       ~ 127 0
24 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6632 0
25 IRAS 12315+0758 GiG 12 34 03.029 +07 41 56.90   10.6       ~ 670 0
26 NGC 4536 GiP 12 34 27.1 +02 11 18 11.14 11.16 10.55 17.393   ~ 852 3
27 NGC 4612 GiG 12 41 32.7539216616 +07 18 53.535354804   11.90       ~ 214 1
28 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 693 0
29 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 859 0
30 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4480 3

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