The bar pattern speed of dwarf galaxy NGC 4431

E. M. Corsini; J. A.L. Aguerri; Victor P. Debattista; A. Pizzella; F. D. Barazza; H. Jerjen

doi:10.1086/518035

The bar pattern speed of dwarf galaxy NGC 4431

E. M. Corsini^*
, J. A.L. Aguerri
, Victor P. Debattista
, A. Pizzella
, F. D. Barazza
, H. Jerjen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

We present surface photometry and stellar kinematics of NGC 4431, a barred dwarf galaxy in the Virgo Cluster undergoing a tidal interaction with one of its neighbors, NGC 4436. We measured its bar pattern speed using the Tremaine-Weinberg method and derived the ratio of the corotation radius, D _L, to the bar semimajor axis, a^B. We found D _L/a_B = 0.6_-0.4^+1.2 at 99% confidence level. Albeit with large uncertainty, the probability that the bar ends close to its corotation radius (i.e., 1.0 ≤ D_La_B ≤ 1.4) is about twice as likely as that the bar is much shorter than the corotation radius (i.e., D_L/a_B > 1.4).

Original language	English
Pages (from-to)	L121-L124
Journal	Astrophysical Journal
Volume	659
Issue number	2 II
DOIs	https://doi.org/10.1086/518035
Publication status	Published - 20 Apr 2007

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title = "The bar pattern speed of dwarf galaxy NGC 4431",

abstract = "We present surface photometry and stellar kinematics of NGC 4431, a barred dwarf galaxy in the Virgo Cluster undergoing a tidal interaction with one of its neighbors, NGC 4436. We measured its bar pattern speed using the Tremaine-Weinberg method and derived the ratio of the corotation radius, D L, to the bar semimajor axis, aB. We found D L/aB = 0.6-0.4+1.2 at 99\% confidence level. Albeit with large uncertainty, the probability that the bar ends close to its corotation radius (i.e., 1.0 ≤ DLaB ≤ 1.4) is about twice as likely as that the bar is much shorter than the corotation radius (i.e., DL/aB > 1.4).",

keywords = "Galaxies: elliptical and lenticular, cD, Galaxies: individual (NGC 4431), Galaxies: kinematics and dynamics, Galaxies: photometry, Galaxies: structure",

author = "Corsini, \{E. M.\} and Aguerri, \{J. A.L.\} and Debattista, \{Victor P.\} and A. Pizzella and Barazza, \{F. D.\} and H. Jerjen",

year = "2007",

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day = "20",

doi = "10.1086/518035",

language = "English",

volume = "659",

pages = "L121--L124",

journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

number = "2 II",

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TY - JOUR

T1 - The bar pattern speed of dwarf galaxy NGC 4431

AU - Corsini, E. M.

AU - Aguerri, J. A.L.

AU - Debattista, Victor P.

AU - Pizzella, A.

AU - Barazza, F. D.

AU - Jerjen, H.

PY - 2007/4/20

Y1 - 2007/4/20

N2 - We present surface photometry and stellar kinematics of NGC 4431, a barred dwarf galaxy in the Virgo Cluster undergoing a tidal interaction with one of its neighbors, NGC 4436. We measured its bar pattern speed using the Tremaine-Weinberg method and derived the ratio of the corotation radius, D L, to the bar semimajor axis, aB. We found D L/aB = 0.6-0.4+1.2 at 99% confidence level. Albeit with large uncertainty, the probability that the bar ends close to its corotation radius (i.e., 1.0 ≤ DLaB ≤ 1.4) is about twice as likely as that the bar is much shorter than the corotation radius (i.e., DL/aB > 1.4).

AB - We present surface photometry and stellar kinematics of NGC 4431, a barred dwarf galaxy in the Virgo Cluster undergoing a tidal interaction with one of its neighbors, NGC 4436. We measured its bar pattern speed using the Tremaine-Weinberg method and derived the ratio of the corotation radius, D L, to the bar semimajor axis, aB. We found D L/aB = 0.6-0.4+1.2 at 99% confidence level. Albeit with large uncertainty, the probability that the bar ends close to its corotation radius (i.e., 1.0 ≤ DLaB ≤ 1.4) is about twice as likely as that the bar is much shorter than the corotation radius (i.e., DL/aB > 1.4).

KW - Galaxies: elliptical and lenticular, cD

KW - Galaxies: individual (NGC 4431)

KW - Galaxies: kinematics and dynamics

KW - Galaxies: photometry

KW - Galaxies: structure

UR - https://www.scopus.com/pages/publications/34248369835

U2 - 10.1086/518035

DO - 10.1086/518035

M3 - Article

SN - 0004-637X

VL - 659

SP - L121-L124

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

The bar pattern speed of dwarf galaxy NGC 4431

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