2010A&A...521A..46G


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST22:25:13

2010A&A...521A..46G - Astronomy and Astrophysics, volume 521, A46-46 (2010/10-1)

Fine-scale density wave structure of Saturn's rings: a hydrodynamic theory.

GRIV E. and GEDALIN M.

Abstract (from CDS):

We examine the linear stability of the Saturnian ring disk of mutually gravitating and physically colliding particles with special emphasis on its fine-scale ∼100 m density wave structure, that is, almost regularly spaced, aligned cylindric density enhancements and optically-thin zones with the width and the spacing between them of roughly several tens particle diameters. We analyze the Jeans' instabilities of gravity perturbations (e.g., those produced by a spontaneous disturbance) analytically by using the Navier-Stokes dynamical equations of a compressible fluid. The theory is not restricted by any assumptions about the thickness of the system. We consider a simple model of the system consisting of a three-dimensional ring disk that is weakly inhomogeneous and whose structure is analyzed by making a horizontally local short-wave approximation. We demonstrate that the disk is probably unstable and that gravity perturbations grow effectively within a few orbital periods. We find that self-gravitation plays a key role in the formation of the fine structure. The predictions of the theory are compared with observations of Saturn's rings by the Cassini spacecraft and are found to be in good agreement. In particular, it appears very likely that some of the quasi-periodic microstructures observed in Saturn's A and B rings - both axisymmetric and nonaxisymmetric ones - are manifestations of these effects. We argue that the quasi-periodic density enhancements revealed in Cassini data are flattened structures, with a height to width ratio of about 0.3. One should analyze high-resolution of the order of 10 m data acquired for the A and B rings (and probably C ring as well) to confirm this prediction. We also show that the gravitational instability is a potential cluster-forming mechanism leading to the formation of porous 100-m-diameter moonlets of preferred mass ∼107g each embedded in the outer A ring, although this has yet to be directly measured.

Abstract Copyright:

Journal keyword(s): planets and satellites: general - planets and satellites: rings - planets and satellites: individual: Saturn - instabilities - hydrodynamics

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 - 2020
#notes
1 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2119 3

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST22:25:13

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
M 106 -- Seyfert 2 Galaxy
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
X (Ref,PBC,...), G (Ref,2015ApJS..218...10V,...), Rad (B3,7C,...), AGN ([VV2000c],[VV2003c],...), Sy2 (Ref,2012MNRAS.426.1750M,...), IG (VV), GiG ([CHM2007]), LIN (Ref), Mas ([CPF88])
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
12 18 57.620 +47 18 13.39 (Infrared) [ ] C 2006AJ....131.1163S
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
12 16 29.487 +47 34 52.39 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
138.319683 +68.842393 [ ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 462 [27] / z(~) 0.001541 [0.000090] / cz 461.98 [26.98]
   D 2002LEDA.........0P
Syntax of morphological type is : mtype quality bibcode
  • mtype : Hubble morphological class (spirals, ellipticals, etc)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the morphological type reference
Morphological type:
SAB(s)bc D 2013MNRAS.428.1927C
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin):
17.78 6.92 ~ (Opt) D 2003A&A...412...45P
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (11) :
B (AB) 9.14 [0.03] C 2014MNRAS.445..881C
V 8.41 [0.08] D 2007ApJS..173..185G
R (AB) 8.11 [0.03] C 2014MNRAS.445..881C
J 6.375 [0.018] C 2006AJ....131.1163S
H 5.716 [0.021] C 2006AJ....131.1163S
K 5.464 [0.022] C 2006AJ....131.1163S
u (AB) 12.504 [0.002] C 2011yCat.2306....0A
g (AB) 10.917 [0.001] C 2011yCat.2306....0A
r (AB) 10.098 [0.001] C 2011yCat.2306....0A
i (AB) 9.658 [0.001] C 2011yCat.2306....0A
z (AB) 9.382 [0.002] C 2011yCat.2306....0A
SIMBAD with radius arcmin
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Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
Some important notes on this object about identifications and objects associations.
notes:


Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 7
The count displayed here is the number of children objects.
The list obtained by clicking the button may be larger, as some children may be linked with different references or probability.

%This number is the number of distinct objets linked, by using this button, you will obtain all links (may be more than one) from that object to his children

: 991
: 160 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (48) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

M 106 NGC 4258 UGC 7353 [CHM2007] LDC 867 J121857.61+4718133
B3 1216+475 OHIO N 427 UZC J121857.7+471820 [CPF88] 121629.0+473500.0
7C 121620.39+473545.00 PBC J1218.9+4718 VLSS J1218.9+4718 [KRL2007b] 111
7C 121626.19+473526.00 1RXP J121856.4+471755 VV 448 [M98c] 121629.7+473455
7C 121635.39+473404.00 RX J1219.0+4717 WB 1216+4735 [NKB95] N4258
GB1 1216+476 RX J1218.9+4718 2XMM J121857.5+471814 [VDD93] 154
GB6 B1216+4735 1RXS J121900.4+471747 XSS J12190+4715 [VV2000c] J121857.5+471814
87GB 121625.0+473537 SAX J1219.7+4721 Z 243-67 [VV2003c] J121857.5+471814
LEDA 39600 SDSS J121857.50+471814.3 Z 244-3 [VV2006c] J121857.5+471814
2MASX J12185761+4718133 SWIFT J1219.4+4720 Z 1216.5+4735 [VV2010c] J121857.5+471814
MCG+08-22-104 SWIFT J1219.0+4715 [BAG2012] 184.7378+47.2874 [VV98c] J121857.5+471814
MY 121625.0+471813.7 SWIFT J1218.9+4717 [CHM2007] HDC 706 J121857.61+4718133 [ZEH2003] RX J1219.0+4717 1

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References (2119 between 1850 and 2020) (Total 2119)
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


distance : 12    velocities : 13   

   

Observing logs


ISO : 1    XMM : 6    herschel : 9    IUE : 2   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : M 106

Link by name to the catalogue in VizieR :

2MASX J12185761+4718133 NGC 4258 1RXS J121900.4+471747 SDSS J121857.50+471814.3 UGC 7353

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2020.08.04-22:25:13

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