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Date and Time of the Query: 2019-03-24 T02:39:07 PDT
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Notes for object NGC 2484

11 note(s) found in NED.


1. 2003A&A...403..889T
Re:3C 189
3C 189. From a Chandra observation of April 2000 (Worral et al. 2001)
the nuclear emission is fitted with a non-thermal spectrum with
{alpha}_x_ = 1.1 ^+0.1^_-0.4_, with flux 3.6 x 10^-13^ erg cm^-2^ s^-1^.
-0.4 Approximately the same energy flux is emitted by a jet and from a
diffuse thermal halo surrounding the central region within a radius of
10". To verify for a possible variability we have analyzed the data of a
Rosat/PSPC observation of 1991. From a spectral fit, assuming a thermal
+ non-thermal components, we get a slightly softer spectrum, {alpha}_x_
= 1.4^+0.2^_-0.2'_ but still consistent with the Chandra
observation. The resulting flux is 6.2 x 10^-13^ erg cm^-2 ^s^-1^;
fixing = {alpha}_x_ 1.2 the allowed range of the flux is 3.0-6.7 x
10^-13^ erg cm^-2^ s^-1^ at 2{sigma} level. Then, if X-ray variability
occurred in the nucleus of 3C 189 in the period 1991-2000, its amplitude
had to be less than a factor ~1. 8. In the present analysis we have
adopted the Chandra results.

2. 2001ApJ...552..508G
Re:NGC 2484
0755+37 (NGC 2484). - We published VLBI and VLA observations of this
FR I radio galaxy in Giovannini et al. (1994).

3. 2000ApJS..131...95F
Re:VSOP J0758+3747
J0758+3747 (NGC 2484). - Our image is in agreement with that of
Polatidis et al. (1995) and Xu et al. (1995) at 1.6 and 5 GHz. VLA
images show a source extended by 2' in position angle 120^deg^, with a
strong arcsecond jet aligned in the same direction as the mas jet.

4. 2000ApJ...530..719W
Re:NGC 2484
NGC 2484.-The ROSAT HRI data are consistent with an unresolved source
of luminosity (3.7 +/- 0.4) x 10^42^ ergs s^-1^ (Canosa et al. 1999).
The best-fit luminosity in unresolved emission from the PSPC is
3.6 +/- 10^42^ ergs s^-1^, in excellent agreement. Our forthcoming
Chandra observation should discriminate between an AGN or compact-gas
origin for the unresolved emission. The PSPC radial profile is
relatively insensitive to the value of {beta} for the extended emission,
but prefers a steeper distribution than {beta} = 2/3, which was assumed
by Worrall & Birkinshaw (1994). The radio structure is shown in de Ruiter
et al. (1986) to be that of a weak, one-sided jet within a diffuse, low
surface-brightness envelope. The minimum pressure in different parts of
the radio source is compared with the gas pressure based on the X-ray
model in Figure 9.

5. 2000A&A...362..871C
Re:NGC 2484
0755+37 (NGC 2484): The galaxy is characterized by a central unresolved
nuclear source. After subtraction of a galaxy elliptical model the
presence of a one-sided optical jet is revealed, cospatial with the SE
brighter radio jet.

6. 1998A&AS..128..153M
Re:GB2 0755+379
NGC 2484; UGC 4125. References to WSRT maps and physical
parameters in Condon & Broderick (1988AJ.....96...30C)

7. 1997A&AS..126..335M
Re:B2 0755+37
0755+37 Using the 2.7 GHz polarization position angle in Parma & Weiler (1981),
we obtain a rotation measure of -70 rad m^-2^ (n=-1, see Sect. 4.1).

8. 1993A&AS...99..407C
Re:B2 0755+37
0755+37
The radio source is very polarized in general, but especially the bright
inner part, with polarization values up to 30% and a quite uniform
polarization angle. Another region of high polarization is the outer edge
of the lobes with polarization values of 25% while in the rest of the
source it remains at the level of 5%. The bright jet points to the more
polarized lobe.

9. 1977A&AS...29..279F
Re:B2 0755+37
0755+37 The source is too extended to be mapped at full resolution at
4995 MHz. The map given in figure 2 at this frequency has a resolution
of 16 x 16 arcsec. The core has a flat spectrum. The extended outer
components have a spectral index {alpha}~0.7.

10. 1976RC2...C...0000d
Re:NGC 2484
= 4C 37.21
NRAO 276.
m{_pg} = 14.9 in CGCG, Vol. III, 1966.

11. 1975ByuO...47....1A
Re:ARK 148
(= NGC 2484)
Elliptical very red object with envelope.
According to [UGC] it is lenticular.


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