Discovery of an ultra-diffuse galaxy in the pisces-perseus supercluster

التفاصيل البيبلوغرافية
العنوان: Discovery of an ultra-diffuse galaxy in the pisces-perseus supercluster
المؤلفون: J. Gallego-Laborda, Margarita Sharina, Jie Wang, Duncan A. Forbes, S. S. Kaisin, Karel Teuwen, David Valls-Gabaud, Eva K. Grebel, E. Toloba, Ronald Läsker, Nhung Ho, M. A. Gómez-Flechoso, J. Fliri, I. D. Karachentsev, Taylor S. Chonis, Rachael L. Beaton, David Martinez-Delgado, Aaron J. Romanowsky, Puragra Guhathakurta
المساهمون: Texas Tech University [Lubbock] (TTU), AUTRES, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Hangzhou Normal University, UCO/Lick Observatory, University of California [Santa Cruz] (UC Santa Cruz), University of California (UC)-University of California (UC), École normale supérieure - Paris (ENS Paris), University of California [Santa Cruz] (UCSC), University of California-University of California
المصدر: E-Prints Complutense. Archivo Institucional de la UCM
instname
E-Prints Complutense: Archivo Institucional de la UCM
Universidad Complutense de Madrid
The Astronomical Journal
The Astronomical Journal, 2016, 151 (4), pp.96. ⟨10.3847/0004-6256/151/4/96⟩
The Astronomical Journal, American Astronomical Society, 2016, 151 (4), pp.96. ⟨10.3847/0004-6256/151/4/96⟩
بيانات النشر: Cross Mark, 2016.
سنة النشر: 2016
مصطلحات موضوعية: Andromeda Galaxy, FOS: Physical sciences, Astrophysics, Star count, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 0103 physical sciences, Coma Cluster, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Galaxy cluster, Astrophysics::Galaxy Astrophysics, [PHYS]Physics [physics], Physics, Effective radius, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Dwarf spheroidal galaxy, Radial velocity, Astronomía, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Biomatemáticas, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
الوصف: We report the discovery of DGSAT I, an ultra-diffuse, quenched galaxy located 10.4 degrees in projection from the Andromeda galaxy (M31). This low-surface brightness galaxy (mu_V = 24.8 mag/arcsec), found with a small amateur telescope, appears unresolved in sub-arcsecond archival Subaru/Suprime-Cam images, and hence has been missed by optical surveys relying on resolved star counts, in spite of its relatively large effective radius (R_e(V) = 12 arcsec) and proximity (15 arcmin) to the well-known dwarf spheroidal galaxy And II. Its red color (V-I = 1.0), shallow Sersic index (n_V=0.68), and the absence of detectable H-alpha emission are typical properties of dwarf spheroidal galaxies and suggest that it is mainly composed of old stars. Initially interpreted as an interesting case of an isolated dwarf spheroidal galaxy in the local universe, our radial velocity measurement obtained with the BTA 6-meter telescope (V_h=5450 +/- 40 km/s) shows that this system is an M31-background galaxy associated with the filament of the Pisces-Perseus supercluster. At the distance of this cluster (~78 Mpc), DGSAT I would have an R_e ~ 4.7 kpc and M_V ~-16.3$. Its properties resemble those of the ultra-diffuse galaxies recently discovered in the Coma cluster. DGSAT I is the first case of these rare ultra-diffuse galaxies found in this galaxy cluster. Unlike the ultra-diffuse galaxies associated with the Coma and Virgo clusters, DGSAT I is found in a much lower density environment, which provides a fresh constraint on the formation mechanisms for this intriguing class of galaxy.
Comment: Accepted for publication in The Astronomical Journal. 18 pages, 8 figures, 2 Tables
وصف الملف: application/pdf
تدمد: 0004-6256
1538-3881
DOI: 10.3847/0004-6256/151/4/96⟩
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a9eaa6afdd51fe95fa3e84246b1b7a20
Rights: OPEN
رقم الانضمام: edsair.doi.dedup.....a9eaa6afdd51fe95fa3e84246b1b7a20
قاعدة البيانات: OpenAIRE
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