2007ApJ...654L.127D

Query : 2007ApJ...654L.127D

2007ApJ...654L.127D - Astrophys. J., 654, L127-L130 (2007/January-2)

Long-lived double-barred galaxies from pseudobulges.

DEBATTISTA V.P. and SHEN J.

Abstract (from CDS):

A large fraction of barred galaxies host secondary bars that are embedded in their large-scale primary counterparts. The evolution of such double-barred galaxies is still not well understood, partly because of a lack of realistic N-body models with which to study them. Here we report a new mechanism for generating such systems, namely, the presence of rotating pseudobulges. We demonstrate with high mass and force resolution collisionless N-body simulations that long-lived secondary bars can form spontaneously without requiring gas, contrary to previous claims. We find that secondary bars rotate faster than primary ones. The rotation is not rigid: the secondary bars pulsate, with their amplitude and pattern speed oscillating as they rotate through the primary bars. This self-consistent study supports previous work based on orbital analysis in the potential of two rigidly rotating bars. The pulsating nature of secondary bars may have important implications for understanding the central region of double-barred galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Bulges - Galaxies: Evolution - Galaxies: Formation - Galaxies: Kinematics and Dynamics - Galaxies: Structure - Stellar Dynamics

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 2950 AG? 09 42 35.1484995048 +58 51 04.584956904   11.8       ~ 223 0

Query : 2007ApJ...654L.127D

Basic data :
NGC 2950 -- Active Galaxy Nucleus Candidate
Other object types: otypes_help 		G (2008ApJ,LEDA,...), Opt (LAMOST,SDSS), AG? (2020MNRAS), * (Gaia)
ICRS coord. (ep=J2000) : 		09 42 35.1484995048 +58 51 04.584956904 (Optical) [ 0.1696 0.1633 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		09 38 58.0311610906 +59 04 47.299431860 [ 0.1696 0.1633 90 ]
Gal coord. (ep=J2000) : 		155.1898662909624 +44.6643141029410 [ 0.1696 0.1633 90 ]
Proper motions mas/yr : 		0.145 -0.009 [0.182 0.223 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 1369 [68] / z(~) 0.004576 [0.000227] / cz 1371.85 [68.05]
   D 2002LEDA.........0P
Morphological type: 		SB_a C 2019MNRAS.488..590B
Angular size (arcmin): 		3.21712 2.13617 129 (Opt) B 2023ApJS..269....3M
Fluxes (10) :
B 11.8 [~] E ~
G 16.290836 [0.006252] C 2020yCat.1350....0G
J 8.834 [0.008] C 2006AJ....131.1163S
H 8.155 [0.011] C 2006AJ....131.1163S
K 7.885 [0.013] C 2006AJ....131.1163S
u (AB) 13.482 [0.002] B 2011yCat.2306....0A
g (AB) 11.645 [0.001] B 2011yCat.2306....0A
r (AB) 10.903 [0.001] B 2011yCat.2306....0A
i (AB) 10.501 [0.001] B 2011yCat.2306....0A
z (AB) 10.230 [0.002] B 2011yCat.2306....0A
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 Display criteria :

Identifiers (13) :
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NGC 2950 MCG+10-14-032 UZC J094235.1+585105 Gaia DR3 1025694162300349440
LAMOST J094235.13+585104.5 SDSS J094235.14+585104.5 Z 0939.0+5905
LEDA 27765 SDSS J094235.10+585104.8 Z 289-16
2MASX J09423511+5851043 UGC 5176 [PVK2003] 145.65167 +58.85222

References (223 between 1850 and 2026) (Total 223)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 9    Distance : 5    PM : 1   

   

Observing logs
Herschel : 1   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NGC 2950

Link by name to the catalogue in VizieR :

NGC 2950 2MASX J09423511+5851043 SDSS J094235.14+585104.5 SDSS J094235.10+585104.8 UGC 5176
Gaia DR3 1025694162300349440

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