mrk 421

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Basic data :
Mrk 421 -- BL Lac - type object 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 (Ref,7C,...), X (Ref,1A,...), gam (1AGL,1AGLR,...), G (CASG,KUG,...), BLL (Ref,SHBL,...), Bla (Ref,[DGT2001],...), UV (2EUVE,EUVE,...), QSO (QSO,[BDW2002],...), GiG ([CHM2007],[U78]), AGN (Ref,CGRaBS), IR (2MASS,WISE), WD* (WD), V* (AAVSO), * (BPS), Q? (FBQS) 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 epoch defined in your output options), position angle (in degrees North to East of the specified coordinate frame) 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 27.31394 +38 12 31.7991 (Radio) [ 0.23 0.12 0 ] A 2010AJ....139.1695L 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 epoch defined in your output options), position angle (in degrees North to East of the specified coordinate frame) 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 FK5 coord. (ep=J2000 eq=2000) : 11 04 27.314 +38 12 31.80 [ 0.23 0.12 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 epoch defined in your output options), position angle (in degrees North to East of the specified coordinate frame) 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 40.57 +38 28 43.1 [ 0.23 0.12 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 epoch defined in your output options), position angle (in degrees North to East of the specified coordinate frame) 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) : 179.8317 +65.0315 [ 0.23 0.12 0 ] 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) 9150 [~] / z(spectroscopic) 0.031 [~] / cz 9294 [~]    D 2011NewA...16..503M 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): 0.650 0.546 85 (IR) 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 (11) : B 13.50 [~] D 2010A&A...518A..10V V 12.90 [~] D 2010A&A...518A..10V R 8.31 [~] D 2008ApJS..175...97H 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 2009yCat.2294....0A g (AB) 13.804 [0.002] C 2009yCat.2294....0A r (AB) 13.090 [0.006] C 2009yCat.2294....0A i (AB) 12.805 [0.005] C 2009yCat.2294....0A z (AB) 12.528 [0.003] C 2009yCat.2294....0A	SIMBAD with radius arcmin Interactive AladinLite view 2MASS DSS SDSSXMMIRACIRISGALEX VizieR photometry viewer    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!).

7C 110140.70+382847.00	FBQS J1104+3812	NFGS 74	VIPS 402
1A 1103+38	0FGL J1104.5+3811	NVSS J110427+381232	WB 1101+3828
2A 1102+384	1FGL J1104.4+3812	NVSS J110427+381231	WD 1101+384
3A 1102+385	2FGL J1104.4+3812	OHIO M 303	WD 1101+385
1AGL J1104+3754	3FGL J1104.4+3812	PBC J1104.4+3813	WISE J110427.30+381231.7
1AGLR J1105+3818	1FHL J1104.4+3812	PG 1101+384	WISE J110427.32+381231.9
ARGO J1105+3821	2FHL J1104.4+3812	PG 1101+385	WN B1101.6+3828A
AT 1112+400	FIRST J110427.3+381231	PKS 1101+384	WN B1101.6+3828
B2 1101+38	GB2 1101+384	QSO B1101+384	2XMM J110427.3+381231
B2.3 1101+38	GB6 J1104+3812	QSO J1104+3812	XMMSL1 J110427.8+381230
B2 1101+384	GB6 B1101+3828	QSO B1101+3828	XSS J11045+3808
B3 1101+384	87GB 110140.1+382841	RBS 939	Z 184-50
B3VLA 1101+384	GeV J1104+3809	2RE J1104+381	Z 1101.7+3828
BPS BS 16553-0057	1H 1104+382	2RE J110424+381203	[BAG2012] 166.1311+38.2082
BPS BS 16545-0024	HESS J1104+382	RE J1104+381	[BDW2002] q1101+3828
BWE 1101+3828	H 1105+38	RE J110423+381214	[CHM2007] LDC 773 J110427.32+3812320
6C 110140+382847	ICRF J110427.3+381231	RGB J1104+382	[CHM2007] HDC 625 J110427.32+3812320
CASG 1364	IERS B1101+384	RGB J1104.5+3812	[DGT2001] B1101+384
CGRaBS J1104+3812	INTREF 438	RX J1104.4+3812	[FS2003] 0578
CJ1 1101+384	IVS B1101+384	1RXS J110427.1+381231	[HB93] 1101+384
CJF B1101+384	JVAS B1101+384	S4 1101+384	[IN88] 1101+384
CLASS J110427.3144+381231.794	JVAS J1104+3812	S4 1101+38	[MGL2009] BZB J1104+3812
2E 2393	JVAS J1104+382	S4 1101+364	[MGL2015] 5BZB J1104+3812
2E 1101.6+3828	KUG 1101+384A	SDSS J110427.31+381231.7	[U78] 1101+38 1
2EG J1104+3812	LEDA 33452	SHBL J110427.3+381231	[VV2000b] J110427.2+381232
3EG J1104+3809	MASIV J1104+3812	SWIFT J1104.5+3813	[VV2003b] J110427.2+381232
EGR J1104+3813	2MASS J11042730+3812318	SWIFT J1104.5+3812	[VV2006b] J110427.2+381232
1ES 1101+38.4	2MASX J11042732+3812320	SWIFT J1104.4+3812	[VV2010b] J110427.2+381232
2EUVE J1104+38.2	2MAXI J1104+382	UGC 6132	[VV98b] J110427.2+381232
EUVE J1104+38.1	MITG J110425+3813	UZC J110427.3+381232	[ZEH2003] RX J1104.4+3812 1
EUVE J1104+38.2	Mrk 421	VIPS J11044+3812	AAVSO 1058+38

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References (2161 between 1850 and 2017) Simbad bibliographic survey began in 1950 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system). Follow new references on this object

number of references only bibcodes reference summary number of references by 1st author number of references by year number of references by journal from: to:

Measurements (10 types) :

External archives :

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

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

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