Hubble Spotlight on Irregular Galaxy IC 3583 5 December 2016

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Image: Hubble spotlight on irregular galaxy IC 3583 5 December 2016 galaxy. Type I's are usually single galaxies of peculiar appearance. They contain a large fraction of young stars, and show the luminous nebulae that are also visible in spiral galaxies. Type II irregulars include the group known as interacting or disrupting galaxies, in which the strange appearance is due to two or more galaxies colliding, merging or otherwise interacting gravitationally. Something similar might be happening with IC 3583. This small galaxy is thought to be gravitationally interacting with one of its neighbors, the spiral Messier 90. Together, the duo form a pairing known as Arp 76. It's still unclear whether these flirtations are the cause of IC 3583's irregular appearance—but whatever the cause, the galaxy makes for a strikingly delicate sight in this NASA/ESA Hubble Space Telescope image, glimmering in the blackness of space. Credit: ESA/Hubble & NASA Provided by NASA This delicate blue group of stars—actually an irregular galaxy named IC 3583—sits some 30 million light-years away in the constellation of Virgo (The Virgin). It may seem to have no discernable structure, but IC 3583 has been found to have a bar of stars running through its center. These structures are common throughout the Universe, and are found within the majority of spiral, many irregular, and some lenticular galaxies. Two of our closest cosmic neighbors, the Large and Small Magellanic Clouds, are barred, indicating that they may have once been barred spiral galaxies that were disrupted or torn apart by the gravitational pull of the Milky Way. Researchers at the University of Leicester, England note there are two types of irregular 1 / 2 APA citation: Image: Hubble spotlight on irregular galaxy IC 3583 (2016, December 5) retrieved 25 September 2021 from https://phys.org/news/2016-12-image-hubble-spotlight-irregular-galaxy.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. 2 / 2 Powered by TCPDF (www.tcpdf.org).

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Arxiv:1312.6769V2
Infall of nearby galaxies into the Virgo cluster as traced with HST1 Igor. D. Karachentsev Special Astrophysical Observatory RAS, Nizhnij Arkhyz, Karachai-Cherkessian Republic, Russia 369167 [email protected] R. Brent Tully Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA Po-Feng Wu Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA Edward J. Shaya Department of Astronomy, University of Maryland, College Park, MD 20742, USA Andrew E. Dolphin Raytheon Company, 1151 East Hermans Road, Tucson, AZ 85756, USA Received ; accepted arXiv:1312.6769v2 [astro-ph.GA] 13 Jan 2014 –2– ABSTRACT We measured the Tip of the Red Giant Branch distances to nine galaxies in the direction to the Virgo cluster using the Advanced Camera for Surveys on the Hubble Space Telescope. These distances put seven galaxies: GR 34, UGC 7512, NGC 4517, IC 3583, NGC 4600, VCC 2037 and KDG 215 in front of the Virgo, and two galaxies: IC 3023, KDG 177 likely inside the cluster. Distances and radial velocities of the galaxies situated between us and the Virgo core clearly exhibit the infall phenomenon toward the cluster. In the case of spherically symmetric radial infall we estimate the radius of the “zero-velocity surface” to be (7.2±0.7) 14 Mpc that yields the total mass of the Virgo cluster to be (8.0 ± 2.3) × 10 M⊙ in good agreement with its virial mass estimates. We conclude that the Virgo outskirts does not contain signiﬁcant amounts of dark matter beyond its virial radius. 1. Introduction In the standard ΛCDM cosmological model groups and clusters are built from the merging of already formed galaxies embedded in massive dark haloes (White & Rees, 1978).
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