18. Mapping the Universe the Local Group: Over 30 Galaxies

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Astronomy 242: Foundations of Astrophysics II 18. Mapping the Universe The Local Group: Over 30 Galaxies two large spirals with satellites one smaller spiral many dwarf elliptical and irregular galaxies Local Group The M81 Group M81 and M82 deep field The M81 Group in HI Tidal dwarfs in the M81 group The M81 Group M81 and M82 deep field The Virgo Cluster:: Over 1000 Galaxies! Distance: ~16 Mpc three massive elliptical galaxies many MW-sized galaxies The Virgo Cluster Abell 1689 Distance: ~754 Mpc Abell 1689: A Galaxy Cluster Makes Its Mark Abell 1689 in X-rays 7 keV Fe line (redshifted) X-ray Spectrum Abell 1689: A Galaxy Cluster Makes Its Mark Abell 1689 Central Galaxy Abell 1689: A Galaxy Cluster Makes Its Mark Abell 1689 Lensed galaxy in background Abell 1689: A Galaxy Cluster Makes Its Mark The Super-Galactic Plane Cosmography of the Local Universe Local Cosmography Pavo-Indus Super-Galactic Plane Perseus-Pisces Virgo Cluster 0 4000 8000 vr (km/s) Fornax Cluster Cosmography of the Local Universe The 2MASS Redshift Survey RESEARCH LETTER Extended Data Figure 3 | One of three orthogonal views that illustrate SGY 5 0 showing the region obscured by the plane of the Milky Way. As in the limits of the Laniakea supercluster. This SGX–SGY view at SGZ 5 0 Fig 2 in the main text, the orange contour encloses the inflowing streams, extends the scene shown in Fig. 2 with the addition of dark blue flow lines away hence, defines the limits of the LaniakeaThe Laniakea Supercluster supercluster of Galaxies containing the mass of from the Laniakea local basin of attraction, and also includes a dark swath at 1017 Suns and 100,000 large galaxies. ©2014 Macmillan Publishers Limited. All rights reserved (flux-limited) 4 vr (10 km/s) 6.0 4.5 3.0 1.5 2dF Redshift Survey The 2dF Galaxy Redshift Survey 150 We Are Here 300 Mpc/h 450 The “Cosmic Web”.

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Atomic Gas Far Away from the Virgo Cluster Core Galaxy NGC 4388
Astronomy & Astrophysics manuscript no. H4396 November 5, 2018 (DOI: will be inserted by hand later) Atomic gas far away from the Virgo cluster core galaxy NGC 4388 A possible link to isolated star formation in the Virgo cluster? B. Vollmer, W. Huchtmeier Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany Received / Accepted 7 ′ Abstract. We have discovered 6 10 M⊙ of atomic gas at a projected distance greater than 4 (20 kpc) from the highly inclined Virgo spiral galaxy NGC 4388. This gas is most probably connected to the very extended Hα plume detected by Yoshida et al. (2002). Its mass makes a nuclear outflow and its radial velocity a minor merger as the origin of the atomic and ionized gas very unlikely. A numerical ram pressure simulation can account for the observed Hi spectrum and the morphology of the Hα plume. An additional outflow mechanism is still needed to reproduce the velocity field of the inner Hα plume. The extraplanar compact Hii region recently found by Gerhard et al. (2002) can be explained as a stripped gas cloud that collapsed and decoupled from the ram pressure wind due to its increased surface density. The star-forming cloud is now falling back onto the galaxy. Key words. Galaxies: individual: NGC 4388 – Galaxies: interactions – Galaxies: ISM – Galaxies: kinematics and dynamics 1. Introduction stripping. Based on their data they favoured a combina- tion of (iii) and (iv). Yoshida et al. (2002) on the other The Virgo cluster spiral galaxy NGC 4388 is located at hand favoured scenario (i) and (iv).
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