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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  
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info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1111.1581