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The Inner Halo of M87: A First Direct View of the Red-Giant Population

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arxiv 1009.3202 v1 pith:YPSLJTHG submitted 2010-09-16 astro-ph.GA

Sarah Bird , William E. Harris , John P. Blakeslee , Chris Flynn This is my paper · ORCID
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keywords haloinnerred-giantdistributionresultassessingaveragingbiasses
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An unusually deep (V,I) imaging dataset for the Virgo supergiant M87 with the Hubble Space Telescope ACS successfully resolves its brightest red-giant stars, reaching M_I(lim) = -2.5. After assessing the photometric completeness and biasses, we use this material to estimate the metallicity distribution for the inner halo of M87, finding that the distribution is very broad and likely to peak near [m/H] ~ -0.4 and perhaps higher. The shape of the MDF strongly resembles that of the inner halo for the nearby giant E galaxy NGC 5128. As a byproduct of our study, we also obtain a preliminary measurement of the distance to M87 with the TRGB (red-giant branch tip) method; the result is (m-M)_0 = 31.12 +- 0.14 (d = 16.7 +- 0.9 Mpc). Averaging this result with three other recent techniques give a weighted mean d(M87) = (16.4 +- 0.5) Mpc.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Dynamics and geometry of the inner sub-parsec-scale jet in 3C 279 observed with the Event Horizon Telescope

    astro-ph.GA 2026-07 conditional novelty 5.0 of 10

    EHT 2021 images of 3C 279 reveal an intrinsic, sideways-elongated jet base whose components move at apparent speeds up to 10c, implying a sub-parsec bend toward the observer and viewing angles below one degree.

  2. Ellis-Bronnikov Wormhole Shadows with Spherically Symmetric Accretion Flow

    gr-qc 2026-06 unverdicted novelty 4.0 of 10

    GRRT simulations of spherically symmetric accretion show the Ellis-Bronnikov wormhole yields brighter shadow and photon ring than Schwarzschild, both consistent with EHT M87* data.

  3. Investigating the interplay of the braneworld gravity and the plasma environment on the black hole shadow

    gr-qc 2025-12 unverdicted novelty 4.0 of 10

    Negative tidal charge enlarges the shadow of rotating braneworld black holes while inhomogeneous plasma shrinks it and homogeneous plasma enlarges it; EHT data limits q to roughly -1.15 to 0.45 for M87* in the low-den...

  4. M87: a cosmic laboratory for deciphering black hole accretion and jet formation

    astro-ph.HE 2024-12 unverdicted novelty 1.0 of 10

    A comprehensive review of M87's black hole, accretion flow, and jet observations from event-horizon to kiloparsec scales, with no new measurements.

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