J/AJ/136/773 Structure of classical bulges and pseudobulges (Fisher+, 2008)
The structure of classical bulges and pseudobulges:
the link between pseudobulges and Sersic index.
Fisher D.B., Drory N.
<Astron. J., 136, 773-839 (2008)>
=2008AJ....136..773F 2008AJ....136..773F
ADC_Keywords: Galaxies, optical ; Morphology
Keywords: galaxies: bulges - galaxies: formation -
galaxies: fundamental parameters - galaxies: structure
Abstract:
In this paper, we study the properties of pseudobulges (bulges that
appear similar to disk galaxies) and classical bulges (bulges which
appear similar to E-type galaxies) in bulge-disk decompositions. We
show that the distribution of bulge Sersic indices, nb, is bimodal,
and this bimodality correlates with the morphology of the bulge.
Pseudobulges have nb~<2 and classical bulges have nb≳2 with
little to no overlap. Also, pseudobulges do not follow the
correlations of Sersic index with structural parameters or the
photometric projections of the fundamental plane in the same way that
classical bulges and elliptical galaxies do. We find that pseudobulges
are systematically flatter than classical bulges and thus more
disk-like in both their morphology and shape.
Description:
We choose galaxies observable from the northern hemisphere that have
data in the Hubble Space Telescope (HST) archive. We limit our
selection to galaxies closer than ∼40Mpc to resolve features in the
bulge.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 79 Sample galaxy properties
table1.dat 150 20 Data sources
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See also:
J/ApJS/182/216 : Surface photometry of Virgo ellipticals (Kormendy+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Identifier
10- 16 A7 --- HType Hubble type (1)
18- 24 A7 --- Mech Driving mechanism
27- 30 F4.2 mag AV Galactic extinction, from Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S)
32- 36 F5.2 mag Vmag V magnitude
38- 43 F6.2 mag VMAG Absolute V magnitude
45- 49 F5.2 Mpc Dist Distance, from Tully & Fisher
(1988, Catalog of Nearby Galaxies)
51- 54 A4 --- n_Ref [KFCB] KFCB when profiles taken from
Kormendy et al. (2009ApJS..182..216K 2009ApJS..182..216K)
56- 79 A24 --- Ref Data sources, in table1.dat
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Note (1): from Sandage & Bedke (1994, The Carnegie Atlas of Galaxies
(Washington, DC: Carnegie Institution of Washington with the
Flintridge Foundation))
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- No Reference number
4- 27 A24 --- Inst Instrument
28- 46 A19 --- Filt Filter(s)
48- 53 F6.4 arcsec/pix Scale Scale
55- 58 F4.1 arcmin FoW1 Field of view
59 A1 --- --- [x]
60- 63 F4.1 arcmin FoW2 Field of view
65-150 A86 --- Ref Reference (1)
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Note (1): Most commonly, the publication of the data is referenced.
If it is found on NED this is noted. "MAST" refers to the Multimission
Archive at STScI. "ING" refers to the Archive of ING telescope data.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Mar-2011