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Title: TIDAL INTERACTIONS AT THE EDGE OF THE LOCAL GROUP: NEW EVIDENCE FOR TIDAL FEATURES IN THE ANTLIA DWARF GALAXY

Abstract

Using deep B-band imaging down to {approx}{mu}{sub B} = 26 mag arcsec{sup -2}, we present evidence for tidal tails in the Antlia Dwarf galaxy, one of the most distant members of the Local Group. This elongation is in the direction of Antlia's nearest neighbor, the Magellanic-type NGC 3109. The tail is offset by <10 Degree-Sign from a vector linking the centers of the two galaxies, indicative of interactions between the pair. Combined with the warped disk previously identified in NGC 3109, Antlia and NGC 3109 must be at a small separation for tidal features to be present in Antlia. We calculate that Antlia cannot be completely disrupted by NGC 3109 in a single interaction unless its orbit pericenter is <6 kpc; however, multiple interactions could significantly alter its morphology. Therefore despite being located right at the edge of the Local Group, environmental effects are playing an important role in Antlia's evolution.

Authors:
; ; ;  [1];  [2];  [3]
  1. School of Physics, Monash University, Clayton, Victoria 3800 (Australia)
  2. School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)
  3. Center for Astronomy and Astrophysics, Observatorio Astronomico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa (Portugal)
Publication Date:
OSTI Identifier:
22078489
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 758; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DWARF STARS; ELONGATION; GALACTIC EVOLUTION; GALAXIES; MORPHOLOGY; ORBITS

Citation Formats

Penny, Samantha J., Pimbblet, Kevin A., Brown, Michael J. I., Floyd, David J. E., Conselice, Christopher J., and Gruetzbauch, Ruth, E-mail: samantha.penny@monash.edu. TIDAL INTERACTIONS AT THE EDGE OF THE LOCAL GROUP: NEW EVIDENCE FOR TIDAL FEATURES IN THE ANTLIA DWARF GALAXY. United States: N. p., 2012. Web. doi:10.1088/2041-8205/758/2/L32.
Penny, Samantha J., Pimbblet, Kevin A., Brown, Michael J. I., Floyd, David J. E., Conselice, Christopher J., & Gruetzbauch, Ruth, E-mail: samantha.penny@monash.edu. TIDAL INTERACTIONS AT THE EDGE OF THE LOCAL GROUP: NEW EVIDENCE FOR TIDAL FEATURES IN THE ANTLIA DWARF GALAXY. United States. doi:10.1088/2041-8205/758/2/L32.
Penny, Samantha J., Pimbblet, Kevin A., Brown, Michael J. I., Floyd, David J. E., Conselice, Christopher J., and Gruetzbauch, Ruth, E-mail: samantha.penny@monash.edu. Sat . "TIDAL INTERACTIONS AT THE EDGE OF THE LOCAL GROUP: NEW EVIDENCE FOR TIDAL FEATURES IN THE ANTLIA DWARF GALAXY". United States. doi:10.1088/2041-8205/758/2/L32.
@article{osti_22078489,
title = {TIDAL INTERACTIONS AT THE EDGE OF THE LOCAL GROUP: NEW EVIDENCE FOR TIDAL FEATURES IN THE ANTLIA DWARF GALAXY},
author = {Penny, Samantha J. and Pimbblet, Kevin A. and Brown, Michael J. I. and Floyd, David J. E. and Conselice, Christopher J. and Gruetzbauch, Ruth, E-mail: samantha.penny@monash.edu},
abstractNote = {Using deep B-band imaging down to {approx}{mu}{sub B} = 26 mag arcsec{sup -2}, we present evidence for tidal tails in the Antlia Dwarf galaxy, one of the most distant members of the Local Group. This elongation is in the direction of Antlia's nearest neighbor, the Magellanic-type NGC 3109. The tail is offset by <10 Degree-Sign from a vector linking the centers of the two galaxies, indicative of interactions between the pair. Combined with the warped disk previously identified in NGC 3109, Antlia and NGC 3109 must be at a small separation for tidal features to be present in Antlia. We calculate that Antlia cannot be completely disrupted by NGC 3109 in a single interaction unless its orbit pericenter is <6 kpc; however, multiple interactions could significantly alter its morphology. Therefore despite being located right at the edge of the Local Group, environmental effects are playing an important role in Antlia's evolution.},
doi = {10.1088/2041-8205/758/2/L32},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 758,
place = {United States},
year = {2012},
month = {10}
}