J/ApJS/98/477 Optical spectral atlas of Seyfert nuclei (Ho+ 1995)
A search for "dwarf" Seyfert nuclei.
II. An optical spectral atlas of the nuclei of nearby galaxies
Ho L.C., Filippenko A.V., Sargent W.L.
<Astrophys. J. Suppl. Ser. 98, 477 (1995)>
=1995ApJS...98..477H 1995ApJS...98..477H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galaxies, Seyfert
Keywords: atlases - galaxies: nuclei - galaxies: Seyfert
Abstract:
We present an optical spectral atlas of the nuclear region (generally
2"x4", or r=<200pc) of a magnitude-limited survey of 486 nearby
galaxies having BT=<12.5mag and δ>0deg. The double
spectrograph on the Hale 5m telescope yielded simultaneous spectral
coverage of ∼4230-5110A and ∼6210-6860A, with a spectral resolution of
∼4A in the blue half and ∼2.5A in the red half. This large,
statistically significant survey contains uniformly observed and
calibrated moderate-dispersion spectra of exceptionally high quality.
The data presented in this paper will be used for various systematic
studies of the physical properties of the nuclei of nearby galaxies,
with special emphasis on searching for low-luminosity active galactic
nuclei, or "dwarf" Seyferts. Our survey led to the discovery of four
relatively obvious but previously uncataloged Seyfert galaxies (NGC
3735, 4395, 4639, and 6951), and many more galactic nuclei showing
subtle evidence for Seyfert activity. We have also identified numerous
low-ionization nuclear emission-line regions (LINERs), some of which
may be powered by nonstellar processes. Of the many "starburst" nuclei
in our sample, several exhibit the spectral features of Wolf-Rayet
stars.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 103 615 Summary of observations and galaxy sample
--------------------------------------------------------------------------------
See also:
1985ApJS...57..503F 1985ApJS...57..503F : Filippenko A.V., Sargent W.L., Paper I
1994IAUS..159..275H 1994IAUS..159..275H : The Palomar Observatory dwarf Seyfert survey (Ho et al.)
VII/51 : Revised Shapley-Ames Catalog of Bright Galaxies (Sandage+, 1981)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Galaxy name
11- 18 A8 "DD/MM/YY" Date UT date of observation
20- 23 I4 s ExpTime Exposure time
25- 27 I3 deg PA Position angle of slit
30- 32 I3 deg PAp Parallactic angle at midpoint of observation
34- 37 F4.2 --- sec(z) Secant of zenith angle at midpoint of
observation, approximately equal to the air mass
39- 41 F3.1 arcsec FWHM Visual estimate of seeing disk
43- 45 A3 --- See Visual estimate of the sky transparency (1)
47- 48 I2 h RAh Right ascension (1950) (2)
50- 51 I2 min RAm Right ascension (1950) (2)
53- 54 I2 s RAs Right ascension (1950) (2)
56 A1 --- DE- Declination sign
57- 58 I2 deg DEd Declination (1950) (2)
60- 61 I2 arcmin DEm Declination (1950) (2)
63- 64 I2 arcsec DEs Declination (1950) (2)
66- 81 A16 --- Type Hubble type and, when appropriate,
luminosity class (3)
83- 86 F4.1 mag BT ? Apparent blue magnitude (uncorrected for
either Galactic or internal extinction),
usually from the RSA, as compiled by
Kraan-Korteweg 1986, Cat. VII/98
89- 92 I4 km/s HRV ? Heliocentric velocity from the RC3, VII/155
94- 95 I2 --- Fig ? Figure in which the spectra of the galaxy are
shown
97-103 A7 --- Notes Notes (4)
--------------------------------------------------------------------------------
Note (1): "No" is listed when conditions were not photometric during
observations of either the galaxy or the standard stars.
Note (2): Positions are usually from the RSA, Cat. VII/51
Note (3): Hubble type and, when appropriate, luminosity class, usually from the
RSA or the RC3 as compiled by Kraan-Korteweg 1986.
The types are given in brackets or parentheses for objects whose
plate material was inadequate.
Types followed by ":" or "?" may be uncertain by more than a subtype
or half a luminosity class.
As with the RSA, various descriptive terms (e.g., spindle, tides,
on-edge) are included where possible.
Note (4): Notes as follows:
a = Slit oriented along the major axis of the galaxy
b = Slit oriented along the minor axis of the galaxy
c = Slit width = 1" and extraction width = 1"x4"
d = Slit width = 4" and extraction width = 4"x4"
e = Poor and variable seeing
f = The white dwarf LDS 749B was used as the standard star
g = The extreme blue end of the blue spectrum suffered from severe
defocusing, resulting in degradation of spectral resolution
and/or uncertainty in the shape of the continuum (see s.2.2)
h = The continuum shape of the red spectrum may be uncertain because
of imperfect correction for spatial focus variations (see s.2.2)
i = Sky subtraction was difficult because of contamination by
H II regions
j = The red spectrum was obtained with the 1200line/mm grating
blazed at 9400A
k = Slit oriented along the bar of the galaxy
l = Slit oriented to avoid bright foreground star
m = slit oriented to include additional object(s) in the exposure
(e.g., nearby star to monitor the seeing or regions of the galaxy
of particular interest)
n = Repeat observation with position angle of slit constrained to be
identical to that used in previous observation
o = H gamma emission is affected by imperfect sky subtraction
p = Extraction window used was 2"x16" (see notes on NGC 4013 in s.4)
q = Observed in the 1982 July run and not subsequently reobserved;
lacks a blue spectrum
r = Reobserved with lower spectral resolution (∼5-8A; see HFS); for
completeness, we show the blue region from these data.
--------------------------------------------------------------------------------
History:
* 04-Mar-1997: Prepared via OCR at CDS.
* 20-Mar-2009: Two names corrected
(End) James Marcout, Patricia Bauer [CDS] 18-Feb-1997