NGC 4945

Query : NGC 4945

Basic data :
NGC 4945 -- 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: 		G (2011MNRAS,6dFGS,...), Rad (MOST,MRC,...), X (PBC,RX,...), AGN (2012ApJ,[HB91],...), gam (1FGL,2FGL,...), IR (IRAS,PSCz,...), Sy2 (2013ApJS), BL? (2021MNRAS), GiG ([CHM2007]), AG? (2020MNRAS), cm (AT20G)
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) : 		13 05 27.279 -49 28 04.44 (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) : 		13 02 32.083 -49 12 00.76 [ ]
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) : 		305.271546 +13.340163 [ ]
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) 677 [150] / z(emission) 0.00225919 [0.0005] / cz 677.2881 [150]
   (Opt) C 2022ApJS..261....2K
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: 		SB(s)cd?edge 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): 		20.42 4.27 43 (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 (6) :
B 9.31 [~] C 1989ESOLV.C......0L
V 14.40 [~] D 2010A&A...518A..10V
R 7.55 [~] C 1989ESOLV.C......0L
J 5.598 [0.016] C 2006AJ....131.1163S
H 4.839 [0.017] C 2006AJ....131.1163S
K 4.483 [0.017] C 2006AJ....131.1163S
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
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!). sed-help-icon
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 ) :

: 5
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

: 75 		: 45 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (59) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NGC 4945 IRAS 13025-4911 RX J130526-49289 XSS J13073-4926
AT20G J130527-492804 LEDA 45279 RX J1305.4-4928 [CHM2007] HDC 790 J130527.27-4928044
AT20G J130527.4-492804 LVHIS 043 1RXS J130528.0-492758 [CHM2007] LDC 993 J130527.27-4928044
6dFGS gJ130527.3-492805 2MASX J13052727-4928044 SGC 130231-4912.2 [DML87] 666
ESO 219-24 2MFGC 10410 SPASS J130526-492822 [HB91] 1302-491
ESO-LV 219-0240 MOST 1302-492 SUMSS J130527-492805 [KRL2007b] 133
1FGL J1305.4-4928 MRC 1302-492 SUMSS J130527-492806 [M98c] 130231.0-491212
2FGL J1305.8-4925 MRC 1302-491 SWIFT J1305.4-4928 [MEM2008] 174
3FGL J1305.4-4926 MSH 13-4-01 SWIFT J1305.2-4928 [VDD93] 177
4FGL J1305.4-4928 PBC J1305.4-4928 TGSSADR J130527.7-492803 [VV2000c] J130527.6-492803
3FHL J1305.4-4927 PKS 1302-49 WMAP J1305-4928 [VV2003c] J130527.6-492803
GLXY G305.2+13.3+455 PKS 1302-492 WMAP J1305-4930 [VV2006c] J130527.6-492803
HIPASS J1305-49 PKS J1305-4928 WMAP J1305-4934 [VV2010c] J130527.6-492803
INTREF 541 PMN J1305-4928 2XMM J130527.3-492804 [VV98c] J130527.6-492803
IRAS F13025-4912 PSCz Q13025-4911 3XMM J130527.4-492804

References (1473 between 1850 and 2024) (Total 1473)
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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                Reference summaries :

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Collections of Measurements


velocities : 13    distance : 14   

   

Observing logs


herschel : 64    ISO : 23    XMM : 2   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : NGC 4945

Link by name to the catalogue in VizieR :

NGC 4945 ESO-LV 219-0240 HIPASS J1305-49 IRAS F13025-4912 IRAS 13025-4911
2MASX J13052727-4928044 PKS 1302-49 PKS 1302-492 PKS J1305-4928 PMN J1305-4928
1RXS J130528.0-492758 SUMSS J130527-492805 SUMSS J130527-492806 WMAP J1305-4928 WMAP J1305-4930
WMAP J1305-4934 [DML87] 666

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Annotations :
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Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

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