High-resolution imaging of Virgo cluster galaxies – II. Detection of the brightest stars in NGC 4523

Shanks, T.; Tanvir, N. R.; Major, J. V.; Doel, A. P.; Dunlop, Colin; Myers, R. M.

doi:10.1093/mnras/256.1.29p

Cited by 9 publications

(4 citation statements)

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“…NGC 4523 is actually considered to be a member of the Virgo Cluster (Binggeli et al 1985;Kim et al 2014), and the distance based on the Tully-Fisher relation, D = 16.8 Mpc (Tully 1988), is adopted. I note that Tikhonov et al (2000) assigned a much smaller distance, D = 6.4 Mpc, based on the photometry of the brightest stars, but with a similar method Shanks et al (1992) placed this galaxy at 11-15 Mpc instead.…”

Section: Observations and Data Reductionmentioning

confidence: 98%

Metallicity gradients in small and nearby spiral galaxies

Bresolin

2019

Monthly Notices of the Royal Astronomical Society

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Spectra of H ii regions obtained with Gemini/GMOS are used to derive the radial metallicity gradients of four small, low-mass spiral galaxies. The analysis of the outer disk of one of them, NGC 1058, uncovers the characteristic flattening found in similar extended disk galaxies. After combining these data with published long-slit observations of nearby spiral galaxies, no evidence for a dependence of the disk scale lengthnormalized metallicity gradients with stellar mass is found, down to log(M /M ) ∼ 8.5. The abundance gradients derived from these observations are compared to predictions from recent cosmological simulations of galaxy evolution, finding that in several cases the simulations fail to reproduce the mean steepening of the gradients, expressed in dex kpc −1 , with decreasing stellar mass for present-day galaxies, or do not extend to sufficiently small stellar masses for a meaningful comparison. The mean steepening of the abundance gradients (in dex kpc −1 ) with decreasing disk scale length is in qualitative agreement with predictions from the inside-out model of Boissier & Prantzos, although the predicted slopes are systematically steeper than observed. This indicates the necessity of including processes such as outflows and radial mixing in similar models of galactic chemical evolution. Published spatially resolved metallicity and photometric data of dwarf irregular galaxies suggest that significant, but transitory, metallicity gradients can develop for systems that have experienced recent (t < 100 Myr) enhanced star formation in their inner disks.

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Section: Observations and Data Reductionmentioning

confidence: 98%

Metallicity gradients in small and nearby spiral galaxies

Bresolin

2019

Monthly Notices of the Royal Astronomical Society

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“…-brightest stars in Virgo galaxies: brightest star candidates have been detected from ground-based images taken under excellent seeing conditions in two Virgo spirals, NGC 4523 [74] and NGC 4571 [57]. Distances of 13 (±2) and 14.9 (±1.5) Mpc were derived, respectively, from yellow and blue supergiants.…”

Section: The Luminosity Of the Brightest Blue Supergiants As A Standa...mentioning

confidence: 99%

Blue Supergiants as a Tool for Extragalactic Distances — Empirical Diagnostics

Bresolin

2003

Lecture Notes in Physics

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Blue supergiant stars can be exceptionally bright objects in the optical, making them prime targets for the determination of extragalactic distances. I describe how their photometric and spectroscopic properties can be calibrated to provide a measurement of their luminosity. I first review two well-known techniques, the luminosity of the brightest blue supergiants and, with the aid of recent spectroscopic data, the equivalent width of the Balmer lines. Next I discuss some recent developments concerning the luminosity dependence of the wind momentum and of the flux-weighted gravity, which can provide, if properly calibrated, powerful diagnostics for the determination of the distance to the parent galaxies.

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“…Recently Shanks et al (1992) have resolved the lowluminosity late-type galaxy NGC 4523 in the Virgo cluster. In this object the three brightest yellow supergiants have <R(3)) = 21.0±0.3.…”

Section: The Faber-jackson Relationmentioning

confidence: 99%

“…In this object the three brightest yellow supergiants have <R(3)) = 21.0±0.3. By adopting M R = -9.6 for there objects Shanks et al ( 1992) obtain (m-M) R =30.6. Assuming no internal reddening in this low-luminosity object then yields (m-M) R ~(m-M) 0 =30.6 and hence D~ 13 kpc.…”

Section: The Faber-jackson Relationmentioning

confidence: 99%

The Hubble parameter

Bergh

1992

PASP

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Distance determinations to individual galaxies, groups, and clusters are critically reviewed. All modern distance determinations have been reduced to a common and internally consistent system. These distances are then used to discuss the present status of the extragalactic distance scale and of the Hubble Parameter, H Q . It is shown that the classical distance-scale "problem" starts quite abruptly at D £ 3 Mpc. It is emphasized that the reasons for this discrepancy are entirely independent of difficulties associated with large-scale deviations from a smooth Hubble flow. From eight different techniques the mean distance modulus of the Virgo cluster is found to be (m-Af) 0 =31.0±0.15 (Z>=15.8±1.1 Mpc). Twelve determinations of the difference between the distance moduli of the Coma and Virgo clusters yield A(ra-Af) 0 =3.71 ±0.05 mag and hence a Coma distance modulus (m-M) Q = 34.71 ±0.16 (Z>=87±6 Mpc). Combining this distance with the Coma cluster's cosmological velocity of 7210 kms' 1 yields a value i/ 0 (local) = 83 ±6 km s -1 Mpc -1 . From the velocity-distance relation for the brightest galaxies in clusters of Bautz-Morgan types I and I-II it is found that H q (global)/H Q {local) =0.92±0.08, in which "local" refers to northern clusters with V Q < 10,000 km s -1 . In other words, the cluster data do not show a statistically significant difference between the local and global values of the Hubble parameter. If one nevertheless adopts H Q (global)/H 0 {local) =0.92±0.08 then one obtains i/ 0 ( global) -76±9 km s -1 Mpc -1 . This observed value of H Q differs at the -3cr level from that predicted by theories of stellar evolution in conjunction with canonical models of the Universe with íl= 1 and A=0.

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High-resolution imaging of Virgo cluster galaxies – II. Detection of the brightest stars in NGC 4523

Cited by 9 publications

References 0 publications

Metallicity gradients in small and nearby spiral galaxies

Metallicity gradients in small and nearby spiral galaxies

Blue Supergiants as a Tool for Extragalactic Distances — Empirical Diagnostics

The Hubble parameter

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