TOO BIG TO BE REAL? NO DEPLETED CORE IN HOLM 15A

被引：13

作者：

Bonfini, Paolo ^{[1
]}

Dullo, Bililign T. ^{[1
]}

Graham, Alister W. ^{[1
]}

机构：

[1] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 807卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

galaxies: elliptical and lenticular; cD; galaxies: individual (Holm 15A); galaxies: photometry; galaxies: structure; EARLY-TYPE GALAXIES; SUPERMASSIVE BLACK-HOLES; ELLIPTIC GALAXIES; MASS DEFICITS; INTRACLUSTER LIGHT; GALACTIC NUCLEI; STAR-CLUSTERS; MERGER RATE; HST; CONNECTION;

D O I：

10.1088/0004-637X/807/2/136

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Partially depleted cores, as measured by core-Sersic model "break radii," are typically tens to a few hundred parsecs in size. Here we investigate the unusually large (R-gamma'=0.5 = 4.57 kpc) depleted core recently reported for Holm 15A, the brightest cluster galaxy of Abell 85. We model the one-dimensional (1D) light profile, and also the two-dimensional (2D) image (using GALFIT-CORSAIR, a tool for fitting the core-Sersic model in 2D). We find good agreement between the 1D and 2D analyses, with minor discrepancies attributable to intrinsic ellipticity gradients. We show that a simple Sersic profile (with a low index n and no depleted core) plus the known outer exponential "halo" provide a good description of the stellar distribution. We caution that while almost every galaxy light profile will have a radius where the negative logarithmic slope of the intensity profile gamma' equals 0.5, this alone does not imply the presence of a partially depleted core within this radius.

引用

页数：10

共 72 条

[1] Planck 2013 results. XVI. Cosmological parameters [J].

Ade, P. A. R. ;

Aghanim, N. ;

Armitage-Caplan, C. ;

Arnaud, M. ;

Ashdown, M. ;

Atrio-Barandela, F. ;

Aumont, J. ;

Baccigalupi, C. ;

Banday, A. J. ;

Barreiro, R. B. ;

Bartlett, J. G. ;

Battaner, E. ;

Benabed, K. ;

Benoit, A. ;

Benoit-Levy, A. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bobin, J. ;

Bock, J. J. ;

Bonaldi, A. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Bridges, M. ;

Bucher, M. ;

Burigana, C. ;

Butler, R. C. ;

Calabrese, E. ;

Cappellini, B. ;

Cardoso, J. -F. ;

Catalano, A. ;

Challinor, A. ;

Chamballu, A. ;

Chary, R. -R. ;

Chen, X. ;

Chiang, H. C. ;

Chiang, L. -Y ;

Christensen, P. R. ;

Church, S. ;

Clements, D. L. ;

Colombi, S. ;

Colombo, L. P. L. ;

Couchot, F. ;

Coulais, A. ;

Crill, B. P. ;

Curto, A. ;

Cuttaia, F. ;

Danese, L. ;

Davies, R. D. .

ASTRONOMY & ASTROPHYSICS, 2014, 571

[2]

[Anonymous], ELLIPTICAL GALAXIES

[3]

[Anonymous], 2013, Planets, DOI [DOI 10.1007/978-94-007-5609-0_2, DOI 10.1007/978-94-007-5609-02]

[4] MASSIVE BLACK-HOLE BINARIES IN ACTIVE GALACTIC NUCLEI [J].

BEGELMAN, MC ;

BLANDFORD, RD ;

REES, MJ .

NATURE, 1980, 287 (5780) :307-309

[5] The merger rate of massive galaxies [J].

Bell, Eric F. ;

Phleps, Stefanie ;

Somerville, Rachel S. ;

Wolf, Christian ;

Borch, Andrea ;

Meisenheimer, Klaus .

ASTROPHYSICAL JOURNAL, 2006, 652 (01) :270-276

[6] SExtractor: Software for source extraction [J].

Bertin, E ;

Arnouts, S .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 117 (02) :393-404

[7]

Bertin E, 2011, ASTR SOC P, V442, P435

[8] GALFIT-CORSAIR: Implementing the Core-Sersic Model Into GALFIT [J].

Bonfini, Paolo .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2014, 126 (944) :935-947

[9] Core formation in galactic nuclei due to recoiling black holes [J].

Boylan-Kolchin, M ;

Ma, CP ;

Quataert, E .

ASTROPHYSICAL JOURNAL, 2004, 613 (01) :L37-L40

[10] The centers of early-type galaxies with HST .2. Empirical models and structural parameters [J].

Byun, YI ;

Grillmair, CJ ;

Faber, SM ;

Ajhar, EA ;

Dressler, A ;

Kormendy, J ;

Lauer, TR ;

Richstone, D ;

Tremaine, S .

ASTRONOMICAL JOURNAL, 1996, 111 (05) :1889-1900

← 1 2 3 4 5 6 7 8 →