J/A+A/446/839 Hα surface photometry in nearby clusters (Gavazzi+, 2006)
Hα surface photometry of galaxies in nearby clusters.
V. The survey completion
Gavazzi G., Boselli A., Cortese L., Arosio I., Gallazzi A., Pedotti P.,
Carrasco L.
<Astron. Astrophys. 446, 839 (2006)>
=2006A&A...446..839G 2006A&A...446..839G
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, H-alpha ;
Equivalent widths
Keywords: galaxies: photometry -
galaxies: clusters: individual: Virgo, Coma, A 1367, Cancer
Abstract:
We present the Hα imaging observations of 273 late-type galaxies
in the nearby rich galaxy clusters Virgo, A 1367, Coma, Cancer,
Hercules and in the Great Wall, carried out primarily with the 2.1m
telescope of the San Pedro Martir Observatory (SPM) and with the
ESO/3.6m telescope. We derived the Hα+[NII] fluxes and
equivalent widths. The Hα survey reached completion for an
optically selected sample of nearby galaxies in and outside rich
clusters. Taking advantage of the completeness of the data set, the
dependence of Hα properties on the Hubble type was determined
for late-type galaxies in the Virgo cluster. Differences in the
gaseous content partly account for the large scatter of the Hα
EW within each Hubble-type class. We studied the radial distributions
of the Hα EW around Coma+A 1367 and the Virgo clusters in two
luminosity bins. Luminous galaxies show a decrease in their average
Hα EW in the inner ∼1 virial radius, while low-luminosity
galaxies do not show this trend. Description:
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 100 273 The target galaxies
table2.dat 93 274 The results of the present observations
(target galaxies + VCC 343)
refs.dat 81 18 References
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See also:
VII/190 : Zwicky Galaxy Catalog (Zwicky+ 1968)
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/A+A/396/449 : Hα surface photometry in Virgo (Gavazzi+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name VCC/CGCG designation
14- 18 A5 --- NGC/IC NGC/IC name (NNNNN or INNNN)
20- 24 I5 --- UGC ?=- UGC number
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 36 F5.2 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 49 F5.2 arcsec DEs Declination (J2000)
51- 54 F4.2 arcmin adiam Major optical diameter (1)
56- 59 F4.2 arcmin bdiam Minor optical diameter (1)
61- 64 I4 km/s HVR ?=- Heliocentric velocity (2)
66- 76 A11 --- Cluster Membership in a cluster or supercluster (3)
77- 81 F5.1 Mpc Dist ?=- Distance, assuming H0=75km/s/Mpc.
83- 88 A6 --- MType Morphological type (4)
90- 94 F5.2 mag phmag ?=- Photographic magnitude
96-100 F5.2 mag BTmag ?=- Total B magnitude (5)
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Note (1): We measured for VCC galaxies the diameters on the du Pont plates at
the faintest detectable isophote, as listed in the VCC. For CGCG
galaxies, these are the major and minor optical diameters (a25,
b25) that were derived, as explained in Gavazzi & Boselli
(1996ApL&C..35....1G 1996ApL&C..35....1G).
Note (2): Heliocentric velocity from the VCC or from Gavazzi et al.
(1999MNRAS.304..595G 1999MNRAS.304..595G, 1999A&AS..136..227G 1999A&AS..136..227G) or from NED.
Note (3): Membership in a cluster or supercluster, defined as in Gavazzi et al.
(1999MNRAS.304..595G 1999MNRAS.304..595G, 1999A&AS..136..227G 1999A&AS..136..227G).
Note (4): Morphological type as given in the VCC or in Gavazzi & Boselli
(1996ApL&C..35....1G 1996ApL&C..35....1G).
Note (5): Total B magnitude determined and corrected for Galactic (according to
Burstein & Heiles, 1978ApJ...225...40B 1978ApJ...225...40B) and for internal extinction,
as described in Boselli et al. (2003, Cat. J/A+A/402/37).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Galaxy designation
14- 17 I4 yr Obs.Y Year of the observation
19- 25 A7 --- Tel Telescope code (1)
27- 30 I4 0.1nm lambda Central wavelength of the ON-band filter
32- 35 F4.2 --- RON Transmissivity RON of the ON-band filter at
the redshifted Hα line
37- 40 F4.2 --- n Normalization factor n of the OFF-band frame,
CNET=CON-n*COFF
42 I1 --- Nexp Number of combined exposures
44 A1 --- --- [x]
46- 49 I4 s TON Integration time of the individual ON band
exposures
51- 56 F6.2 [mW/m2] Zp Photometric Zero point, such that
LogFlux=Zp+Log(CNET)-Log(TON)
58 A1 --- PQ [PC] Flag indicating whether the frame was
taken under photometric (P) or
through light cirrus (C)
60- 62 I3 0.1nm EWHa Hα equivalent width
as determined from this work
64- 65 I2 0.1nm e_EWHa ?=- rms uncertainty on EWHA
67- 72 F6.2 [mW/m2] logFHa ?=- Logarithm of the Hα flux
as determined from this work
74- 77 F4.2 [mW/m2] e_logFHa ? rms uncertainty on logFHa
80- 81 I2 0.1nm EWHal ?=- Hα equivalent width
from the literature
83- 88 F6.2 [mW/m2] logFHal ?=- Logarithm of the Hα flux
from the literature
90- 93 I4 -- r_logFHal ?=- Reference for EWHal and logFHal
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Note (1): Telescopes as follows:
SPM/2.1 = San Pedro Martir telescope of 2.1m
ESO/3.6 = ESO telescope of 3.6m
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Ref Reference number
6- 24 A19 --- BibCode BibCode
26- 43 A18 --- Aut Author's name
45- 81 A37 --- Com Comments
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Acknowledgements: Giuseppe Gavazzi, giuseppe.gavazzi(at)mib.infn.it
References:
Gavazzi et al., Paper I 2002A&A...386..114G 2002A&A...386..114G
Boselli et al., Paper II 2002A&A...386..124B 2002A&A...386..124B
Boselli et al., Paper III 2002A&A...386..134B 2002A&A...386..134B
Gavazzi et al., Paper IV 2002A&A...396..449G 2002A&A...396..449G, Cat. J/A+A/396/449
(End) Patricia Vannier [CDS] 23-Jan-2006