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dc.contributor.author
Salinas, R.
dc.contributor.author
Richtler, T.
dc.contributor.author
Bassino, Lilia Patricia
dc.contributor.author
Romanowsky, A. J.
dc.contributor.author
Schuberth, Y.
dc.date.available
2016-12-26T20:22:01Z
dc.date.issued
2012-02
dc.identifier.citation
Salinas, R.; Richtler, T.; Bassino, Lilia Patricia; Romanowsky, A. J.; Schuberth, Y.; Kinematic properties of the field elliptical NGC 7507; Edp Sciences; Astronomy And Astrophysics; 538; 2-2012; 1-17
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/10229
dc.description.abstract
The dark matter (DM) halos of field elliptical galaxies have not been well-studied and their properties appear controversial in the literature. While some galaxies appear to be nearly devoid of DM, others show clear evidence of its presence. Furthermore, modified Newtonian dynamics (MOND), which has been found to have predictive power in the domain of disk galaxies, has not yet been investigated for isolated elliptical galaxies. We study the kinematics of the isolated elliptical NGC 7507, which has been claimed as a clear example of DM presence in early-type galaxies. We obtained major and minor axis long-slit spectroscopy of NGC 7507 using the Gemini South telescope and deep imaging in Kron-Cousins R and Washington C using the CTIO/MOSAIC camera. Mean velocities, velocity dispersion and higher order moments of the velocity distribution are measured out to ∼90 . The galaxy, although almost circular, has significant rotation along the minor axis and a rapidly declining velocity dispersion along both axes. The velocity dispersion profile is modeled in the context of a spherical Jeans analysis. Models without DM provide an excellent representation of the data with a mass-to-light ratio (M/L) of 3.1 (R-band). The most massive Navarro-Frenk-White (NFW) halo the data allow has a virial mass of only 3.9+3.1 −2.1 × 1011 M , although the data are more consistent with models that have a slight radial anisotropy, which implies the galaxy has an even lower DM halo mass of 2.2+2.0 −1.2 × 1011 M . Modeling of the h4 Gauss-Hermite coefficient is inconclusive but seems to be consistent with mild radial anisotropy. A cored logarithmic DM halo with parameters r0 = 7 kpc and v0 = 100 km s−1 can also reproduce the observed velocity dispersion profile. The MOND predictions overestimate the velocity dispersion. In conclusion, we cannot easily reproduce the previous findings of a predominance of DM in NGC 7507 within a simple spherical model. DM may be present, but only in conjunction with a strong radial anisotropy, for which there are some indications.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Edp Sciences
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Galaxies
dc.subject
Ngc7507
dc.subject
Kinematics
dc.subject
Dynamics
dc.subject.classification
Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Kinematic properties of the field elliptical NGC 7507
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-12-14T12:55:10Z
dc.identifier.eissn
1432-0746
dc.journal.volume
538
dc.journal.pagination
1-17
dc.journal.pais
Francia
dc.journal.ciudad
Les Ulis
dc.description.fil
Fil: Salinas, R.. Universidad de Concepción; Chile. European Southern Observatory; Chile
dc.description.fil
Fil: Richtler, T.. Universidad de Concepción; Chile
dc.description.fil
Fil: Bassino, Lilia Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.description.fil
Fil: Romanowsky, A. J.. California State University; Estados Unidos
dc.description.fil
Fil: Schuberth, Y.. Universitaet Bonn; Alemania
dc.journal.title
Astronomy And Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/full_html/2012/02/aa16517-11/aa16517-11.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201116517
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1111.1581
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