NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-11-13 T11:53:19 PST
Help | Comment | NED Home

You have selected the following parameters to search on:

Parameters for Distances and Cosmology: Ho= 73.0; Ωmatter = 0.27; Ωvacuum = 0.73;
Derived Quantities use a Redshift corrected to a Reference Frame defined by the 3K CMB

NED results for object NGC 6998


1 objects found in NED.    

SOURCE LIST

 Row          Object Name                 EquJ2000.0       Object  Velocity/Redshift    Mag./  Separ.               Number of                                 Row 
 No.     (* => Essential Note)       RA               DEC  Type     km/s       z   Qual Filter arcmin Refs Notes Phot Posn Vel/z Diam Assoc Images   Spectra  No. 
1    NGC 6998                       21h01m37.7s -28d01m55s G       11890  0.039661      15.16    ...   101     7   57   14    11   16     0 Retrieve Retrieve 1   

Detailed information for each object


Object No. 1 - NGC 6998

INDEX for NGC 6998
Essential Data (jump to sub-section of this query report):

   Essential Note    
   Cross-IDs    
   Coordinates    
   Basic Data   
   Quantities Derived from Redshift    
   Redshift-Independent Distances
   Quick-Look Photometry and Luminosities
   Quick-Look Angular and Physical Sizes
   Classifications
   Foreground Galactic Extinction    
   External Services
Detailed Data (NED queries):

Images
   
57 Photometric data point(s) and SED   
Spectra   
Redshift-Independent Distances
101 Reference(s)   
14 Position data point(s)
11 Redshift data point(s)   
16 Diameter data point(s)   
7 Note(s)   
ESO data    
PKS data    
RC3 data    

ESSENTIAL NOTE for NGC 6998 (Back to INDEX)
N/A

CROSS-IDENTIFICATIONS for NGC 6998 (Back to INDEX)
Object Names Type Object Names Type
NGC 6998G PKS J2101-2801 RadioS
ESO 464- G 014 G PMN J2101-2802 RadioS
ESO 205838-2813.7 G MRC 2058-282 RadioS
PKS 2058-28 RadioSOW -297.8 RadioS
2MASX J21013771-2801543 IrS TXS 2058-282 RadioS
2MASXi J2101377-280154 IrS Cul 2058-282 RadioS
2MASS J21013769-2801544 IrS PAPER J315.53-28.04 RadioS
GALEXASC J210137.71-280154.0 UvS NEWPS_5yr_5s 461 RadioS
SGC 205838-2813.7 G NEWPS_5yr_5s_15 444 RadioS
ESO-LV 4640140 G [KWP81] 2058-28 RadioS
6dF J2101377-280154 G ABELL 3733:[PL95] G2 G
6dFGSv 10055 G ABELL 3733:[S96a] 020 G
[RC2] A2058-28 G [SS98] 205838.66-281344.1 G
APMBGC 464+077-100 G ABELL 3733:[KMD98] 014 G
APMUKS(BJ) B205838.61-281344.1G [DZ2015] 265-01 G
MRSS 464-157595 G    
PGC 065925 G    
PKS B2058-282 RadioS    

COORDINATES for NGC 6998 (Back to INDEX)

Position Reference:1996A&AS..116..203S

Reference    Frame     Longitude    Latitude        RA           DEC      Uncertainty Ellipse (arcsec)
                       (degrees)   (degrees)                              Semimajor Semiminor  PA(deg)
Equatorial (B1950.0)  314.661075  -28.228928 20h58m38.658s -28d13m44.14s  5.00E-01  5.00E-01    0
Equatorial (J2000.0)  315.407005  -28.031916 21h01m37.681s -28d01m54.90s  5.00E-01  5.00E-01    0
Ecliptic   (B1950.0)  309.060476  -10.637754                              5.00E-01  5.00E-01    0
Ecliptic   (J2000.0)  309.759949  -10.642413                              5.00E-01  5.00E-01    0
Galactic               17.762935  -39.563731                              5.00E-01  5.00E-01    0
SuperGalactic         241.682911   36.589156                              5.00E-01  5.00E-01    0
Additional detailed measurements with references are also available by clicking below:
14 Position data point(s)

REDSHIFT-INDEPENDENT DISTANCES for NGC 6998 (Back to INDEX)

4 Distances found in NED View 4 Individual Distance Measurement(s) for NGC 6998

Summary Statistics computed by NED from 4 Distance(s) in the literature:
NOTE: These summary statistics are provided for "quick-look" reference only;
they are based exclusively on original values, as published.
No homogenization or corrections have been applied.


NGC 6998 Distance Modulus
(mag)
Metric Distance
(Mpc)
Mean 36.30 182.750
Std. Dev. 0.20 17.154
Min. 36.05 162.000
Max. 36.55 204.000
Median 36.30 182.500

CLASSIFICATIONS (TYPES, ATTRIBUTES) for NGC 6998 (Back to INDEX)
TypeAs PublishedNED HomogenizedFlagReference Code
HierarchyG2Group member, 2nd ranked galaxy...1995ApJ...440...28P
Galaxy MorphologyE0E0...1991RC3.9.C...0000d
Radio Morphologyradio jetradio jet...1992A&AS...95..249L
Distance IndicatorTully-FisherTully-Fisher...2007A&A...465...71T
8 Detailed Classification(s)


FOREGROUND GALACTIC EXTINCTION for NGC 6998 (Back to INDEX)
Galactic Extinction from the Schlafly & Finkbeiner 2011, Appendix; 2011ApJ...737..103S (SF11) recalibration 
of the Schlegel, Finkbeiner & Davis 1998, Appendix B; 1998ApJ...500..525S (SFD98) infrared-based dust map.
The map is based on dust emission from COBE/DIRBE and IRAS/ISSA;
the recalibration assumes a Fitzpatrick (1999PASP..111...63F) reddening law with Rv = 3.1 and different source spectrum than SFD98.

L a n d o l tS D S SU K I R T
Filter [µm]U (0.35)B (0.43)V (0.54)R (0.64)I (0.80)u (0.36)g (0.47)r (0.62)i (0.75)z (0.89)J (1.25)H (1.66)K (2.19)L' (3.78)
Aλ [mag]0.5000.4180.3160.2500.1740.4890.3810.2640.1960.1460.0820.0520.0350.018
Show/Hide Aλ magnitudes in all 88 photometric bands based on SF11
For completeness, we include the original SFD98 values:
L a n d o l tS D S SU K I R T
Filter [µm]U (0.34)B (0.44)V (0.54)R (0.65)I (0.81)u (0.35)g (0.49)r (0.63)i (0.78)z (0.93)J (1.27)H (1.67)K (2.22)L' (3.81)
Aλ [mag]0.6250.4970.3820.3080.2230.5930.4370.3170.2400.1700.1040.0660.0420.018


Galactic Extinction based on H I Column Densities and Galaxy Counts
(Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
AB = 0.420 mag
See Notes on Galactic Extinction for important caveats.

BASIC DATA for NGC 6998 (Back to INDEX)
Helio. Radial Velocity     :     11890 +/-        8 km/s      
Redshift                   :  0.039661 +/- 0.000028        2000MNRAS.313..469S
Major Diameter (arcmin)    :   0.8
Minor Diameter (arcmin)    :   0.7
Magnitude and Filter       : 15.16
Classifications            : E0;Radio galaxy     

NOTE: This information is indicative only. With the exception of the
      redshift they are unreferenced and highly inhomogeneous as to
      their origin. The Radial Velocity (when available) is computed
      from the listed redshift. The remaining values are designed to
      orient the user with a quick-look, overall assessment of the
      general properties of the object in question. They are not
      averages nor are they standardized in any way.
Additional detailed measurements with references are also available by clicking below:
11 Redshift data point(s)      57 photometric data point(s)      16 Diameter data point(s)      

QUANTITIES DERIVED FROM REDSHIFT for NGC 6998 (Details)(Back to INDEX)
Calculated and Corrected Velocities
V (Heliocentric)           :   11890 +/-      8 km/s      2000MNRAS.313..469S
V (Kinematic LSR)          :   11896 +/-      8 km/s      1986MNRAS.221.1023K
V (Galactocentric GSR)     :   11947 +/-      9 km/s      1991RC3.9.C...0000d
V (Local Group)            :   11966 +/-     10 km/s      1996AJ....111..794K
V (3K CMB)                 :   11637 +/-     20 km/s      1996ApJ...473..576F
V (Virgo Infall only)      :   11856 +/-     12 km/s      2000ApJ...529..786M
V (Virgo + GA only)        :   12014 +/-     17 km/s      2000ApJ...529..786M
V (Virgo + GA + Shapley)   :   12053 +/-     17 km/s      2000ApJ...529..786M

Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
D (Galactocentric GSR)     :   163.7 +/-   11.5 Mpc      (m-M) = 36.07 +/- 0.15 mag
D (Local Group)            :   163.9 +/-   11.5 Mpc      (m-M) = 36.07 +/- 0.15 mag
D (3K CMB)                 :   159.4 +/-   11.2 Mpc      (m-M) = 36.01 +/- 0.15 mag
D (Virgo Infall only)      :   162.4 +/-   11.4 Mpc      (m-M) = 36.05 +/- 0.15 mag
D (Virgo + GA only)        :   164.6 +/-   11.5 Mpc      (m-M) = 36.08 +/- 0.15 mag
D (Virgo + GA + Shapley)   :   165.1 +/-   11.6 Mpc      (m-M) = 36.09 +/- 0.15 mag

Scale at Hubble Flow Distances
Scale (Galactocentric GSR) :     793 pc/arcsec =  0.793 kpc/arcsec =  47.61 kpc/arcmin =   2.86 Mpc/degree
Scale (Local Group)        :     795 pc/arcsec =  0.795 kpc/arcsec =  47.68 kpc/arcmin =   2.86 Mpc/degree
Scale (3K CMB)             :     773 pc/arcsec =  0.773 kpc/arcsec =  46.37 kpc/arcmin =   2.78 Mpc/degree
Scale (Virgo Infall only)  :     787 pc/arcsec =  0.787 kpc/arcsec =  47.24 kpc/arcmin =   2.83 Mpc/degree
Scale (Virgo + GA only)    :     798 pc/arcsec =  0.798 kpc/arcsec =  47.87 kpc/arcmin =   2.87 Mpc/degree
Scale(Virgo + GA + Shapley):     800 pc/arcsec =  0.800 kpc/arcsec =  48.03 kpc/arcmin =   2.88 Mpc/degree

To Search for Nearby Objects (Physical Companions): Enter Your Preferred Values and click on "Submit Environment Search" button
Search for Objects within +/-arcmin where 100 kpc = 2.082 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 11890 km/sec
Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift 0.038818 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Luminosity Distance : 164 Mpc (m-M) = 36.08 mag Angular-Size Distance : 152 Mpc (m-M) = 35.91 mag Co-Moving Radial Distance : 158 Mpc (m-M) = 36.00 mag Co-Moving Tangential Dist. : 158 Mpc (m-M) = 36.00 mag Co-Moving Volume : 0.0166 Gpc^3 Light Travel-Time : 0.506 Gyr Age at Redshift 0.038818 : 12.793 Gyr Age of Universe : 13.299 Gyr Scale (Cosmology Corrected): 738 pc/arcsec = 0.738 kpc/arcsec = 44.29 kpc/arcmin = 2.66 Mpc/degree Surface Brightness Dimming : Flux Density per Unit Area = 0.85870; Magnitude per Unit Area = 0.1654 mag
To change Cosmological Input Parameters for Derived Quantities: Enter Your Preferred Values and click on "Submit Changed Hubble Parameters for this object" button
HoΩmatterΩvacuum     
Correct Redshift To the Reference Frame defined by: as Input for Calculation of the Distances and Cosmology-Corrected Quantities

QUICK-LOOK PHOTOMETRY and LUMINOSITIES for NGC 6998 (Back to INDEX)

The brightest flux in each of the following spectral regions, when available:
Gamma-Ray (ν > 2E19 Hz); X-Ray (2E19 Hz > ν > 2E16 Hz); Ultraviolet (2E16 Hz > ν > 9E14 Hz); Visual (9E14 Hz > ν > 3E14 Hz);
Near-Infrared (3E14 Hz > ν > 6E13 Hz); Mid-Infrared (6E13 Hz > ν > 7.5E12 Hz); Far-Infrared (7.5E12 Hz > ν > 1E12 Hz);
Sub-Millimeter (1E12 Hz > ν > 3E11 Hz); Millimeter (3E11 Hz > ν > 3E10 Hz); Radio (3E10 Hz > ν).

Spectral
Region
Band Apparent Mag or Flux Refcode Absolute Mag or νLν [W] νLν [L(Bolometric)]
UltravioletNUV (GALEX) AB 20.7526 +/- 0.134262 mag 2012GASC..C...0000S-15.55 +/- 0.27 [mag] 2.44E+08 +/- 3.78E+07
VisualR (Cousins) (R_T) 13.61 +/- 0.09 mag 1989ESOLV.C...0000L-22.69 +/- 0.25 [mag] 5.40E+10 +/- 6.89E+09
Near-InfraredH 10.668 +/- 0.066 mag 20032MASX.C.......:-25.63 +/- 0.24 [mag] 1.05E+11 +/- 1.18E+10
Radio80 MHz 50. Jy 1995AuJPh..48..143S 1.60E+34 [W] 4.16E+07
NOTE: The above quantities are derived using an estimated Distance Modulus of (36.30 +/- 0.20) mag corresponding to
a Metric Distance of (182.750 +/- 17.154) Mpc using the Average NED-D value.
The quantities quoted above have not necessarily been corrected for foreground extinction, and no K-Corrections have been applied.

View details and SED for 57 Photometric data point(s) available in NED.

QUICK-LOOK ANGULAR & PHYSICAL DIAMETERS for NGC 6998 (Back to INDEX)

The largest diameters in the Visual and Near-Infrared spectral regions, when available:

Passband Apparent Major Axis
(2a) [arcsec]
Apparent Minor Axis
(2b) [arcsec]
PA
[degrees]
(J2000.0)
Reference Level RefcodePhysical Major Axis
(2a) [kpc]
Physical Minor Axis
(2b) [kpc]
ESO-LV "Quick Blue" IIa-O 96.6186.9594 27.0 B-mag arcsec^-2^ 1989ESOLV.C...0000L85.6077.04
K_s (2MASS "total") 114.00111.72135 Diameter for "total" magnitude 20032MASX.C.......:20032MASX.C.......:101.0098.98
NOTE: Physical diameters are derived using a scale of 0.8860 kpc/arcsec based on Average NED-D Metric Distance of (182.750 +/- 17.154) Mpc.
The quantities quoted above have not necessarily been corrected for foreground extinction.

View details for 16 Diameter data point(s) available in NED.

EXTERNAL ARCHIVES AND SERVICES for NGC 6998 Help (Back to INDEX)
Resources for Object NamesSite/Service
Query SIMBAD by primary NED object name -- NGC 6998SIMBAD (CDS, Strasbourg, France)
Revised New General Catalogue -- NGC 6998VizieR Catalog Query (U.S. mirror, CfA/Harvard)
ESO/Uppsala Survey -- ESO 464- G 014 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
2MASS Extended Source Images (JHKs) -- 2MASX J21013771-2801543 NASA/IPAC Infrared Science Archive (IRSA)
2MASS Extended Source Images (JHKs) -- 2MASXi J2101377-280154 NASA/IPAC Infrared Science Archive (IRSA)
The ESO-LV catalog-- ESO-LV 4640140 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Query 6dF Galaxy Redshift Survey -- 6dF J2101377-280154 6dF Galaxy Redshift Survey
Query 6dF Galaxy Redshift Survey -- 6dFGSv 10055 6dF Galaxy Redshift Survey
Catalogue of Principal Galaxies -- PGC 065925 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Retrieve mean data from LEDA -- PGC 065925 The Lyon/Meudon Extragalactic Database (LEDA)
Parkes Radio Sources Catalogue -- PKS B2058-282 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Parkes-MIT-NRAO 4.85GHz Surveys -- PMN J2101-2802 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Texas Survey of radio sources at 365MHz -- TXS 2058-282 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- NGC 6998GALEX Mission Data Archive at MAST
Explore IRSA resources with RADAR (10 arcsec search radius) -- NGC 6998NASA/IPAC Infrared Science Archive (IRSA)
Resources for position 21h01m37.7s, -28d01m55s (J2000)Site/Service
Query Optical and UV Mission Archives (Default search radius)Multimission Archive at STScI (MAST)
Query High Energy Mission Archives (Default search radius)HEASARC (NASA/GSFC)
Explore resources with DataScope (15 arcmin search radius)HEASARC (NASA/GSFC)
Query IRSA for WISE images (10 arcmin search radius)NASA/IPAC Infrared Science Archive (IRSA)
Band(s): Size:
NASA/IPAC Infrared Science Archive (IRSA)
Band(s): Size:
NASA/IPAC Infrared Science Archive (IRSA)
NASA/IPAC Infrared Science Archive (IRSA)
 Size:    Contours (PS)  JPEG  FITS File 
NRAO/VLA Sky Survey (NVSS)
The NRAO Data Archive System

Back to the list




Back to NED Home