Mrk 421

Query : Mrk 421

Basic data :
Mrk 421 -- BL Lac
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: 		Rad (2010AJ,7C,...), gam (2017ApJ,1AGL,...), X (2012ApJS,1A,...), BLL (2010ApJ,SHBL,...), G (2012A&A,CASG,...), Bla (2012ApJ,[DGT2001],...), QSO (2016A&A,QSO,...), Bz? (2019A&A,3HSP,...), UV (2EUVE,EUVE,...), AGN (2011ApJ,CGRaBS), GiG ([CHM2007],[U78]), * (BPS,Gaia), MIR (WISEA,WISE), WD* (WD), BL? (2021MNRAS), Q? (FBQS), V* (AAVSO), NIR (2MASS), Opt (SDSS)
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) : 		11 04 27.3140835504 +38 12 31.798495872 (Optical) [ 0.0124 0.0148 90 ] A 2020yCat.1350....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] : 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) : 		11 01 40.5722183622 +38 28 43.062425906 [ 0.0124 0.0148 90 ]
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) : 		179.8316744947119 +65.0314808644110 [ 0.0124 0.0148 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr : 		-0.112 0.039 [0.017 0.017 90] A 2020yCat.1350....0G
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) 8859 [~] / z(emission) 0.030 [~] / cz 8994 [~]
   (Opt) D 2016ApJ...818..113N
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas): 		0.0037 [0.0182] A 2020yCat.1350....0G
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): 		0.633 0.481 75 (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 13.50 [~] D 2010A&A...518A..10V
V 12.90 [~] D 2010A&A...518A..10V
R 8.31 [~] D 2008ApJS..175...97H
G 13.157050 [0.030539] C 2020yCat.1350....0G
J 11.091 [0.021] C 2006AJ....131.1163S
H 10.394 [0.027] C 2006AJ....131.1163S
K 9.996 [0.029] C 2006AJ....131.1163S
u (AB) 14.791 [0.006] C 2009ApJS..182..543A
g (AB) 13.804 [0.002] C 2009ApJS..182..543A
r (AB) 13.090 [0.006] C 2009ApJS..182..543A
i (AB) 12.805 [0.005] C 2009ApJS..182..543A
z (AB) 12.528 [0.003] C 2009ApJS..182..543A
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 ) :

: 4 : 7 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (149) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

7C 110140.70+382847.00 4FGL J1104.4+3812 OHIO M 303 WD 1101+384
1A 1103+38 1FHL J1104.4+3812 PBC J1104.4+3813 2WHSP J110427.3+381230
2A 1102+384 2FHL J1104.4+3812 PG 1101+385 WISEA J110427.30+381231.7
3A 1102+385 3FHL J1104.4+3812 PG 1101+384 WISE J110427.30+381231.7
1AGL J1104+3754 FIRST J110427.3+381231 PKS 1101+384 WISE J110427.32+381231.9
2AGL J1105+3813 FL8Y J1104.4+3812 QSO B1101+3828 WN B1101.6+3828A
1AGLR J1105+3818 1FLE J1105+3807 QSO J1104+3812 WN B1101.6+3828
ARGO J1105+3821 GB2 1101+384 QSO B1101+384 2XMM J110427.3+381231
AT 1112+400 GB6 B1101+3828 RBS 939 XMMSL1 J110427.8+381230
B2 1101+384 GB6 J1104+3812 2RE J110424+381203 XSS J11045+3808
B2.3 1101+38 87GB 110140.1+382841 2RE J1104+381 9Y-MST J1104+3812
B2 1101+38 GeV J1104+3809 RE J110423+381214 Z 1101.7+3828
B3 1101+384 1H 1104+382 RE J1104+381 Z 184-50
B3VLA 1101+384 HESS J1104+382 RFC J1104+3812 [BAG2012] 166.1311+38.2082
BPS BS 16545-0024 H 1105+38 RGB J1104.5+3812 [BDW2002] q1101+3828
BPS BS 16553-0057 3HSP J110427.3+381231 RGB J1104+382 [CHM2007] HDC 625 J110427.32+3812320
BWE 1101+3828 2HWC J1104+381 RX J1104.4+3812 [CHM2007] LDC 773 J110427.32+3812320
6C 110140+382847 3HWC J1104+381 1RXS J110427.1+381231 [DGT2001] B1101+384
CASG 1364 ICRF J110427.3+381231 S4 1101+364 [FS2003] 0578
CGRaBS J1104+3812 IERS B1101+384 S4 1101+38 [HB93] 1101+384
CJ1 1101+384 ILT J110427.27+381241.8 S4 1101+384 [IN88] 1101+384
CJF B1101+384 INTREF 438 SDSS J110427.31+381231.7 [LBC2010] B1101+384
CLASS J110427.3144+381231.794 IVS B1101+384 SHBL J110427.3+381231 [MGL2009] BZB J1104+3812
CRATES J110428+381228 JVAS J1104+382 SWIFT J1104.4+3812 [MML2015] 5BZB J1104+3812
2E 1101.6+3828 JVAS J1104+3812 SWIFT J1104.5+3812 [U78] 1101+38 1
2E 2393 JVAS B1101+384 SWIFT J1104.5+3813 [VV2000b] J110427.2+381232
2EG J1104+3812 KUG 1101+384A TeV J1104+382 [VV2003b] J110427.2+381232
3EG J1104+3809 LEDA 33452 TeV J1104+3811 [VV2006b] J110427.2+381232
EGR J1104+3813 MASIV J1104+3812 TGSSADR J110427.3+381241 [VV2010b] J110427.2+381232
1ES 1101+38.4 2MASS J11042730+3812318 TIC 353970208 [VV98b] J110427.2+381232
2EUVE J1104+38.2 2MASX J11042732+3812320 TXS 1101+384 [ZEH2003] RX J1104.4+3812 1
EUVE J1104+38.2 2MAXI J1104+382 UGC 6132 AAVSO 1058+38
EUVE J1104+38.1 MITG J110425+3813 UZC J110427.3+381232 Gaia DR2 763335402123160576
FBQS J1104+3812 Mrk 421 VIPS 402 Gaia DR1 763335397827754112
0FGL J1104.5+3811 MY 110140.9+381236.6 VIPS J11044+3812 Gaia DR3 763335402123160576
1FGL J1104.4+3812 NFGS 74 VLSSr J110427.9+381244
2FGL J1104.4+3812 NVSS J110427+381232 WB 1101+3828
3FGL J1104.4+3812 NVSS J110427+381231 WD 1101+385

References (2679 between 1850 and 2024) (Total 2679)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

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                 or select by : (not exhaustive, explanation here)

Collections of Measurements


velocities : 16    V* : 1    distance : 1    PLX : 1    PM : 3    MK : 1   

   

Observing logs


IUE : 111    XMM : 34   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : Mrk 421

Link by name to the catalogue in VizieR :

BWE 1101+3828 2E 2393 3EG J1104+3809 EUVE J1104+38.2 EUVE J1104+38.1
FIRST J110427.3+381231 IERS B1101+384 KUG 1101+384A 2MASS J11042730+3812318 2MASX J11042732+3812320
MITG J110425+3813 NVSS J110427+381232 NVSS J110427+381231 PG 1101+385 PG 1101+384
PKS 1101+384 2RE J110424+381203 2RE J1104+381 1RXS J110427.1+381231 SDSS J110427.31+381231.7
UGC 6132 WD 1101+385 WD 1101+384 WISEA J110427.30+381231.7 WISE J110427.30+381231.7
WISE J110427.32+381231.9 WN B1101.6+3828A WN B1101.6+3828 Gaia DR2 763335402123160576 Gaia DR1 763335397827754112
Gaia DR3 763335402123160576

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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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