NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-27 T05:57:25 PDT
Help | Comment | NED Home

Notes for object NGC 4013

8 note(s) found in NED.


1. 2003ApJS..148..383M
Re:NGC 4013
A13. NGC 4013 NGC 4013 is an Sb galaxy with an inclination angle of
90deg, observed at the WHT with the TTF. The H{alpha} and [N II] images
are shown in Figure 13. A dust lane is clearly present on the southwest
side of the disk, and a poorly subtracted foreground star coincides with
the position of the nucleus of the galaxy. Extraplanar emission is
clearly detected at heights of ~2 kpc into the southeast halo above the
nucleus (EM = 45 pc cm^-6^ at 1 kpc height) as well as into the
northwest halo at ~2 kpc on the south-west side of the galaxy (EM = 25
pc cm^-6^ at 1 kpc height). A bright knot of H{alpha} emission is also
detected in the northwest halo at a galactocentric radius of 1 kpc on
the northeast side.
The total H{alpha} luminosity /D^2^_25_ for NGC 4013 is 3.2 x 10^37^
ergs s^-1^ kpc-^2^, only 6% of which is attributed to extraplanar gas.
The scale height of the gas is~-1.5 kpc on the southeast side of the
galaxy (the northwest side was poorly fitted by a two-exponential
function), and the total ionized mass associated with this extraplanar
gas is 6.5 x 10^7^ M_{sun}_. There is little or no correlation between
the disk and halo gas and no substantial deviation from the average
extraplanar vertical profile with radius. The presence of the foreground
star near the nucleus of the galaxy makes further analysis difficult.
NGC 4013 was also observed by Rand (1996). He detects four fiIaments on
either side of the central region, forming an "H" structure that extends
about 2.5 kpc into the halo. Rand also detects extraplanar emission on
the northeast side, extending up about 2.5 kpc, as well as on the
southwest side (but not as prominent). Interestingly, we also detect
this less prominent emission on the southwest side, but not the brighter
emission on the northeast side. Part of the apparent discrepancy comes
from the fact that Rand's data include a contribution from [N II]
emission. The [N II] image and [N II]/H{alpha} map indicate that the
[N II] emission is enhanced in this region (we also observed this galaxy
spectroscopically and confirm that [N II]/H{alpha} {approx}1.5 at |z| ~1
kpc; see Paper II). The ratio map also shows a strong vertical
gradient. The [N II] {lambda}6583/H{alpha} ratios are H II region-like
in the disk but reach values close to unity at |z|{approx} 1 kpc.

2. 2003ApJ...592...79M
Re:NGC 4013
A6. NGC 4013
NGC 4013 is a Sb galaxy at a distance of 17 Mpc (260 pc pixel^-1^;
Tully 1988) and with an inclination of 90^deg^ (Bottema 1995). R96
detects extraplanar gas features extending up to |z| ~ 2.5 kpc on the
northeast side, as well as a less prominent line-emitting region on
the southwest side. Our recent imaging study (Paper I) confirms the
presence of eDIG in this object. We positioned our slit to cover the
northeast region. The photoionization/TML hybrid model with
log T = 5.0 works well for NGC 4013. While there are only a few
[O III]/H{alpha} data points, they are consistent with the
[S II]/H{alpha} data points, suggesting an ionization parameter of
3.8 and implying that approximately 50% of the line ratios originate
from the TML region. The photoionization/shock hybrid model is unable
to reproduce the observed emission-line ratios.

3. 2000ApJS..129...93F
Re:NGC 4013
NGC 4013. - We detect a moderately resolved 1.1 mJy core and a
small extension to the northeast, parallel to the projected disk of this
edge-on galaxy. There is an additional 3 mJy of weak disk emission. On
the basis of the widely different NVSS and FIRST detections (40.5 vs.
11.9 mJy), this disk emission must extend tens of arcseconds. Hummel,
Beck, & Dettmar (1991) present 10" resolution 5 GHz data of NGC 4013
(UGC 6963), which show both the prominent core and the extended disk
emission. Recent high-resolution (0.15") 15 GHz observations did not
detect NGC 4013 above a 10{sigma} limit of 1 mJy (N. Nagar 2000, private
communication).
We also detect a slightly resolved 3.8 mJy background source, 2' to
the far southeast. This source is also clearly seen in the map of Condon
(1987). The APM facility reveals a 19.6 mag stellar-like object, which
lacks further identification as yet.

4. 1995ApJS...98..477H
Re:NGC 4013
A dark absorption lane cuts across this nearly edge-on galaxy, thereby
hiding the nucleus. We extracted the spectrum by summing a large swath
(16") centered on the expected position of the nucleus in order to
include some faint emission visible on either side of the dust lane. The
interpolated region of the blue spectrum (~4630 A, Fig. 46) was corrupted
by a defective region of the CCD.

5. 1994CAG1..B...0000S
Re:NGC 4013
Sbc:
H-1997-H
May 25/26, 1938
Agfa Blue
60 min
The size of the bulge is the only classification
criterion for NGC 4013; the galaxy is nearly
edge on.

6. 1973UGC...C...0000N
Re:UGC 06963
Sb (de Vaucouleurs)

7. 1964RC1...C...0000d
Re:NGC 4013
No bright nucleus. Bright, diffuse, peanut-shaped bulge with a bright star
superimposed. Strong equatorial dark lane. Exactly edge-on. Very similar
to NGC 0891.
See also HA 105, 230, 1937.
Photograph:
Handbuch der Ap., 5, 2, 843, 1933.

8. 1918PLicO..13....9C
Re:NGC 4013
A moderately bright, very narrow edgewise spiral 4' long in p.a. 70^deg^. There
is a clear-cut dark lane down the middle in which is a star of magn. 12. See
Abs. Eff. 20 s.n.


Back to NED Home