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J/A+AS/130/285 Sample of starburst nucleus galaxies (Contini+ 1998)
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Starbursts in barred spiral galaxies.
III. Definition of a homogeneous sample of Starburst Nucleus Galaxies
Contini T., Considere S., Davoust E.
<Astron. Astrophys. Suppl. Ser. 130, 285 (1998)>
=1998A&AS..130..285C (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, Markarian ; Active gal. nuclei ; H II regions ;
Spectrophotometry
Keywords: galaxies: starburst - galaxies: active - galaxies:
statistics - galaxies: ISM - infrared: galaxies
Abstract:
This paper presents optical long-slit spectroscopic observations of
105 barred Markarian IRAS galaxies. These observations are used to
determine the spectral type (starburst or Seyfert) of emission-line
regions in the nucleus and along the bar of the galaxies, in order to
define a homogeneous sample of Starburst Nucleus Galaxies (SBNGs). Our
selection criteria (ultraviolet excess, far infrared emission and
barred morphology) have been very efficient for selecting star-forming
galaxies, since our sample of 221 emission-line regions includes 82%
nuclear or extranuclear starbursts. The contamination by Seyferts is
low (9%). The remaining galaxies (9%) are objects with ambiguous
classification (HII or LINER). The dust content and H{alpha}
luminosity increase towards the nuclei of the galaxies. No significant
variation of the electron density is found between nuclear and bar HII
regions. However, the mean H{alpha} luminosity and electron density in
the bar are higher than in typical disk HII regions. We investigate
different mechanisms for explaining the excess of nitrogen emission
observed in our starburst nuclei. There is no evidence for the
presence of a weak hidden active galactic nucleus in our starburst
galaxies. The cause of this excess is probably a selective enrichment
of nitrogen in the nuclei of the galaxies, following a succession of
short and intense bursts of star formation. Our sample of SBNGs,
located at a mean redshift of 0.015, has moderate H{alpha}
(10^41^erg/s) and far infrared (10^10^L{sun}) luminosities. The
types are distributed equally among early- and late-type giant spirals
with a slight preference for Sbc/Sc types because of their barred
morphology. The majority (62%) of SBNGs are isolated with no sign of
gravitational interaction. In terms of distance, luminosity and level
of interaction, SBNGs are intermediate between HII galaxies and
luminous infrared galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 144 Global properties of the sample
table3.dat 34 101 Log of spectroscopic observations
table4.dat 128 212 Intensity and equivalent width of emission lines
table5.dat 36 211 Magnitude and color indices of the spectral continuum
table6.dat 77 221 Derived spectrophotometric parameters
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See also:
VII/172 : First Byurakan Survey (FBS) (Markarian+, 1989)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Mrk Markarian (Cat. <VII/172>) number
6- 13 F8.5 h RAh Right ascension (1950)
15- 22 F8.4 deg DEdeg Declination (1950)
24- 36 A13 --- Name Other name
38- 42 A5 --- Mtype Morphological type from RC3
44 A1 --- Ring [R] Ring
46 A1 --- Mult [M] Multiple system
48- 51 F4.1 --- CType ? Code for morphological type (RC3)
53- 56 F4.1 deg i ? Inclination angle
58- 62 I5 km/s HRV Heliocentric radial velocity
64- 68 F5.2 mag Bmag Apparent blue magnitude
70- 75 F6.2 mag Mabs Absolute blue magnitude
77 I1 --- q_F12 Quality codes for the IRAS 12 micron band
79- 85 F7.4 Jy F12 Flux density at 12 micron
87 I1 --- q_F25 Quality codes for the IRAS 25 micron band
89- 94 F6.4 Jy F25 Flux density at 25 micron
96 I1 --- q_F60 Quality codes for the IRAS 60 micron band
98-104 F7.4 Jy F60 Flux density at 60 micron
106 I1 --- q_F100 Quality codes for the IRAS 100 micron band
108-114 F7.4 Jy F100 Flux density at 100 micron
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Mrk Markarian (Cat. <VII/172>) number
6- 13 A8 "DD/MM/YY" Date Date of observation
15- 16 I2 min Exp Exposure time
18- 21 I4 0.1nm Rangel Spectral range (lower value)
22 A1 --- ---- [-]
23- 26 I4 0.1nm Rangeu Spectral range (upper value)
28- 30 F3.1 arcsec Width Slit width
32- 34 I3 deg PA Position angle of the slit
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Mrk Markarian (Cat. <VII/172>) number
8 I1 --- No ? Number of the emission-line region
in the galaxy
10 I1 --- Pos [0/1] Position: nuclear (1) or
extranuclear (0) emission-line region
12- 16 F5.2 arcsec Dist ? Distance between extranuclear
emission-line regions and the galaxy
nucleus
17- 21 F5.2 arcsec Size Size of emission-line regions
22 A1 --- l_F(Hbeta) Limit lfag on F(Hbeta)
23- 27 F5.2 10-14mW/m2 F(Hbeta) ? H{beta} (4861) line flux (1)
29- 34 F6.2 0.1nm W(Hbeta) ? H{beta} (4861) equivalent width
36- 40 F5.2 10-14mW/m2 F([OIII]a) ? [OIII] (4959) line flux (1)
42- 47 F6.2 0.1nm W([OIII]a) ? [OIII] (4959) equivalent width
49- 53 F5.2 10-14mW/m2 F([OIII]b) ? [OIII] (5007) line flux (1)
55- 61 F7.2 0.1nm W([OIII]b) ? [OIII] (5007) equivalent width
63- 67 F5.2 10-14mW/m2 F([NII]a) ? [NII] (6548) line flux (1)
69- 74 F6.2 0.1nm W([NII]a) ? [NII] (6548) equivalent width
76- 81 F6.2 10-14mW/m2 F(Halpha) ? H{alpha} (6653) line flux (1)
83- 89 F7.2 0.1nm W(Halpha) ? H{alpha} (6653) equivalent width
91- 95 F5.2 10-14mW/m2 F([NII]b) ? [NII] (6583) line flux (1)
97-102 F6.2 0.1nm W([NII]b) ? [NII] (6583) equivalent width
104-108 F5.2 10-14mW/m2 F([SII]a) ? [SII] (6716) line flux (1)
110-115 F6.2 0.1nm W([SII]a) ? [SII] (6716) equivalent width
117-121 F5.2 10-14mW/m2 F([SII]b) ? [SII] (6731) line flux (1)
123-128 F6.2 0.1nm W([SII]b) ? [SII] (6731) equivalent width
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Note (1): Line fluxes are not corrected for reddening
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Mrk Markarian (Cat. <VII/172>) number
6 I1 --- No ? Number of the emission-line region in the galaxy
8- 12 F5.2 mag Bmag ? B magnitude
14- 18 F5.2 mag Vmag V magnitude
20- 24 F5.2 mag Rmag R magnitude
26- 30 F5.2 mag b-v ? b-v color index
32- 36 F5.2 mag v-r v-r color index
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Mrk Markarian (Cat. <VII/172>) number
6 I1 --- No ? Number of the emission-line region
in the galaxy
8 I1 --- Pos nuclear (1) or extranuclear (0)
emission-line region
10- 14 F5.1 Mpc Dgal ? Distance of the galaxy
(with H_0_=75km/s/Mpc)
16- 19 F4.1 kpc Dist ? Distance between extranuclear
emission-line regions and the
galaxy nucleus
21- 23 F3.1 kpc Size Size of emission-line regions
25- 29 F5.3 mag c(Hbeta) ? Reddening coefficient
31- 34 I4 cm-3 NE ? Electronic density
36- 40 F5.2 --- log([NII]/Halpha) ? log([NII]6583/H{alpha})
42- 46 F5.2 --- log([SII]/Halpha) ? log([SII]6716+6731/H{alpha})
48- 52 F5.2 --- log([OIII]/Hbeta) ? log([OIII]5007/H{beta})
54- 64 A11 --- Stype Results of the spectral
classification (1)
65- 70 F6.2 10-15mW/m2 I(Halpha) ? H{alpha} line flux corrected for
reddening
72- 76 F5.2 [10-7J/s] log(L(Halpha)) ? log of H{alpha} luminosity
corrected for reddening
77 A1 --- u_I(Halpha) Uncertainty flag on I(Halpha)
and log(L(Halpha)) (2)
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Note (1): Spectral classification:
- SBNG: Starburst Nucleus Galaxy
- HIIG: HII Galaxy
- HII: extranuclear HII region
- LIN: LINER
- Sey 1: Seyfert 1
- Sey 2: Seyfert 2
- SBNG,LIN ?: ambiguous classification between starburst and LINER
- HII ?: uncertain classification
Note (2): A lower limit (:) on both the H{alpha} flux and luminosity is given
if the reddening coefficient c(Hbeta) has not been determined
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Acknowledgements: T. Contini <contini@wise1.tau.ac.il>
References:
Contini et al., Paper I. 1995A&A...303..440C
Contini et al., Paper II. 1997A&A...324...41C
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(End) Patricia Bauer [CDS] 05-Dec-1997