The distance to NGC1316 (Fornax A): yet another curious case
| Title: | The distance to NGC1316 (Fornax A): yet another curious case |
|---|---|
| Authors: | Cantiello, Michele, Grado, Aniello, Blakeslee, John P., Raimondo, Gabriella, Di Rico, Gianluca, Limatola, Luca, Brocato, Enzo, Della Valle, Massimo, Gilmozzi, Roberto |
| Publication Year: | 2013 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| More Details: | The distance of NGC1316, the brightest galaxy in Fornax, is an interesting test for the cosmological distance scale. First, because Fornax is the 2nd largest cluster of galaxies at <~25 Mpc after Virgo and, in contrast to Virgo, has a small line-of-sight depth; and second, because NGC1316 is the galaxy with the largest number of detected SNeIa, giving the opportunity to test the consistency of SNeIa distances internally and against other indicators. We measure SBF mags in NGC1316 from ground and space-based imaging data, providing a homogeneous set of measurements over a wide wavelength interval. The SBF, coupled with empirical and theoretical calibrations, are used to estimate the distance to the galaxy. We 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. Our distance modulus m-M=31.59 +-0.05(stat) +-0.14(sys), when placed in a consistent Cepheid distance scale, agrees with the results from other indicators. However, our result is ~17% larger than the most recent estimate based on SNeIa. Possible explanations for this disagreement are the uncertainties on internal extinction, or calibration issues. Concerning the stellar population analysis, we confirm earlier results from other indicators: the field stars in NGC1316 are dominated by a solar metallicity, intermediate age component. A substantial mismatch exists between B-band SBF models and data, a behavior that 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. Comment: 21 pages, 13 figures; A&A accepted |
| Document Type: | Working Paper |
| DOI: | 10.1051/0004-6361/201220756 |
| Access URL: | http://arxiv.org/abs/1302.7132 |
| Accession Number: | edsarx.1302.7132 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: The distance to NGC1316 (Fornax A): yet another curious case – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Cantiello%2C+Michele%22">Cantiello, Michele</searchLink><br /><searchLink fieldCode="AR" term="%22Grado%2C+Aniello%22">Grado, Aniello</searchLink><br /><searchLink fieldCode="AR" term="%22Blakeslee%2C+John+P%2E%22">Blakeslee, John P.</searchLink><br /><searchLink fieldCode="AR" term="%22Raimondo%2C+Gabriella%22">Raimondo, Gabriella</searchLink><br /><searchLink fieldCode="AR" term="%22Di+Rico%2C+Gianluca%22">Di Rico, Gianluca</searchLink><br /><searchLink fieldCode="AR" term="%22Limatola%2C+Luca%22">Limatola, Luca</searchLink><br /><searchLink fieldCode="AR" term="%22Brocato%2C+Enzo%22">Brocato, Enzo</searchLink><br /><searchLink fieldCode="AR" term="%22Della+Valle%2C+Massimo%22">Della Valle, Massimo</searchLink><br /><searchLink fieldCode="AR" term="%22Gilmozzi%2C+Roberto%22">Gilmozzi, Roberto</searchLink> – Name: DatePubCY Label: Publication Year Group: Date Data: 2013 – Name: Subset Label: Collection Group: HoldingsInfo Data: Astrophysics – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Cosmology+and+Nongalactic+Astrophysics%22">Astrophysics - Cosmology and Nongalactic Astrophysics</searchLink> – Name: Abstract Label: Description Group: Ab Data: The distance of NGC1316, the brightest galaxy in Fornax, is an interesting test for the cosmological distance scale. First, because Fornax is the 2nd largest cluster of galaxies at <~25 Mpc after Virgo and, in contrast to Virgo, has a small line-of-sight depth; and second, because NGC1316 is the galaxy with the largest number of detected SNeIa, giving the opportunity to test the consistency of SNeIa distances internally and against other indicators. We measure SBF mags in NGC1316 from ground and space-based imaging data, providing a homogeneous set of measurements over a wide wavelength interval. The SBF, coupled with empirical and theoretical calibrations, are used to estimate the distance to the galaxy. We 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. Our distance modulus m-M=31.59 +-0.05(stat) +-0.14(sys), when placed in a consistent Cepheid distance scale, agrees with the results from other indicators. However, our result is ~17% larger than the most recent estimate based on SNeIa. Possible explanations for this disagreement are the uncertainties on internal extinction, or calibration issues. Concerning the stellar population analysis, we confirm earlier results from other indicators: the field stars in NGC1316 are dominated by a solar metallicity, intermediate age component. A substantial mismatch exists between B-band SBF models and data, a behavior that 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.<br />Comment: 21 pages, 13 figures; A&A accepted – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1051/0004-6361/201220756 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/1302.7132" linkWindow="_blank">http://arxiv.org/abs/1302.7132</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.1302.7132 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/0004-6361/201220756 Subjects: – SubjectFull: Astrophysics - Cosmology and Nongalactic Astrophysics Type: general Titles: – TitleFull: The distance to NGC1316 (Fornax A): yet another curious case Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Cantiello, Michele – PersonEntity: Name: NameFull: Grado, Aniello – PersonEntity: Name: NameFull: Blakeslee, John P. – PersonEntity: Name: NameFull: Raimondo, Gabriella – PersonEntity: Name: NameFull: Di Rico, Gianluca – PersonEntity: Name: NameFull: Limatola, Luca – PersonEntity: Name: NameFull: Brocato, Enzo – PersonEntity: Name: NameFull: Della Valle, Massimo – PersonEntity: Name: NameFull: Gilmozzi, Roberto IsPartOfRelationships: – BibEntity: Dates: – D: 28 M: 02 Type: published Y: 2013 |
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