CDS

NGC 3998

Query : NGC 3998
C.D.S. - SIMBAD4 rel 1.7 - 2018.11.20CET20:03:32

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

Basic data :
NGC 3998 -- Seyfert 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: 		LIN (), X (Ref,1AXG,...), Rad (BWE,6C,...), G (Ref,LEDA,...), AGN (Ref,CGRaBS,...), QSO (QSO,[WTW94]), IR (IRAS,2MASS), * (Gaia), GiG ([CHM2007]), GiP ([T76]), Bz? ([SRM2005]), Sy1 (Ref), SyG (Ref), gam (INTREF)
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] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    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) : 		11 57 56.1333561013 +55 27 12.925850484 (Optical) [ 0.7422 0.7488 90 ] C 2018yCat.1345....0G
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] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    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) : 		11 55 20.9523882278 +55 43 54.787414888 [ 0.7488 0.7422 0 ]
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] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    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) : 		138.1723302389582 +60.0633451092376 [ 0.7488 0.7422 69 ]
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) 1091 [71] / z(~) 0.003646 [0.000237] / cz 1093.04 [71.05]
   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: 		SA0 C 2015ApJS..217...27A
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)
  • (incl) : inclination (in units of 15° from 0 to 7)
  • (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): 		1.987 1.629 130 (NIR) C 2006AJ....131.1163S
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 (12) :
B 11.64 [0.02] C 2016MNRAS.460..689R
V 12.10 [~] D 2010A&A...518A..10V
R 10.09 [0.02] C 2016MNRAS.460..689R
G 13.8644 [0.0062] C 2018yCat.1345....0G
J 8.327 [0.007] C 2006AJ....131.1163S
H 7.584 [0.008] C 2006AJ....131.1163S
K 7.365 [0.010] C 2006AJ....131.1163S
u (AB) 15.09 [0.01] D 2009yCat.2294....0A
g (AB) 14.121 [0.007] C 2009yCat.2294....0A
r (AB) 10.632 [0.006] C 2009yCat.2294....0A
i (AB) 13.604 [0.007] C 2009yCat.2294....0A
z (AB) 12.308 [0.007] C 2009yCat.2294....0A
SIMBAD with radius arcmin
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within radius 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!).
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 : 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 (59) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NGC 3998 IVS B1155+557 SWIFT J1158.1+5526 [R97] NGC 3998 9
1AXG J115757+5527 LEDA 37642 UGC 6946 [RW2000] NGC 3998 X-2
BWE 1155+5543 2MASS J11575612+5527128 UZC J115756.2+552713 [SMM2006b] J115756.13+552713.0
6C 115520+554340 2MASX J11575616+5527128 WB 1155+5543 [SRM2005] J115756.13+552712.9
7C 115520.50+554349.00 MCG+09-20-046 WN B1155.3+5543 [T76] 47B
CGRaBS J1157+5527 NVSS J115756+552712 2XMM J115756.1+552714 [VV2000c] J115756.1+552713
2E 2561 PBC J1158.1+5527 XSS J11570+5514 [VV2003c] J115756.1+552713
2E 1155.3+5543 QSO B1155+557 Z 269-25 [VV2006c] J115756.1+552713
1ES 1155+55.7 RBS 1053 Z 1155.3+5543 [VV2010c] J115756.1+552713
FIRST J115756.1+552713 RGB J1157+554 [BAG2012] 179.5145+55.4250 [VV98c] J115756.1+552713
GB6 B1155+5543 RX J1157.9+5527 [CAB95] IRAS F11553+5543 [WTW94] 1155+557
87GB 115521.8+554353 1RXS J115756.1+552717 [CHM2007] LDC 867 J115756.16+5527128 [ZEH2003] RX J1157.9+5527 1
INTREF 470 SDSS J115756.13+552713.0 [CHM2007] HDC 706 J115756.16+5527128 EQ 1155+557
IRAS 11553+5543 SWIFT J1157.8+5529 [LB2005] NGC 3998 X1 Gaia DR2 841020502831092352
IRAS F11553+5543 SWIFT J1158.0+5526 [M98c] 115521.4+554357

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References (539 between 1850 and 2019) (Total 539)
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


distance : 7    velocities : 11   

   

Observing logs


ISO : 5    XMM : 1    herschel : 5    IUE : 14   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : NGC 3998

Link by name to the catalogue in VizieR :

NGC 3998 BWE 1155+5543 2E 2561 FIRST J115756.1+552713 IRAS 11553+5543
IRAS F11553+5543 2MASS J11575612+5527128 2MASX J11575616+5527128 NVSS J115756+552712 1RXS J115756.1+552717
SDSS J115756.13+552713.0 UGC 6946 WN B1155.3+5543 Gaia DR2 841020502831092352

Search by coordinates in Vizier (radius: 30 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
The list of all annotations to SIMBAD objects can be found here .

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2018.11.20-20:03:32

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