J/AJ/138/873 Galaxies with Hα emission in A2151 (Cedres+, 2009)
Star-forming galaxies in the Hercules cluster: Hα imaging of A2151.
Cedres B., Iglesias-Paramo J., Vilchez J.M., Reverte D., Petropoulou V.,
Hernandez-Fernandez J.
<Astron. J., 138, 873-888 (2009)>
=2009AJ....138..873C 2009AJ....138..873C
ADC_Keywords: Clusters, galaxy ; Spectroscopy ; Equivalent widths
Keywords: galaxies: clusters: general
Abstract:
This paper presents the first results of an Hα imaging survey of
galaxies in the central regions of the A2151 cluster. A total of 50
sources were detected in Hα, from which 41 were classified as
secure members of the cluster and 2 as likely members based on
spectroscopic and photometric redshift considerations. The remaining
seven galaxies were classified as background contaminants and thus
excluded from our study on the Hα properties of the cluster.
Description:
The data were obtained during two observational runs. The first one
was from 2003 May 6 to 7 at the 256cm Nordic Optical Telescope (NOT)
located at the Roque de los Muchachos Observatory. The second run was
during 2003 June 4 and 5 at the 420cm William Herschel Telescope
(WHT), located also at the Roque de los Muchachos Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 50 Detected galaxies with emission in our survey
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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- 2 I2 --- Seq [1/50] Identification number
4- 28 A25 --- Name Galaxy name
30- 31 I2 h RAh Right ascension (J2000)
33- 34 I2 min RAm Right ascension (J2000)
36- 39 F4.1 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 51 F4.1 arcsec DEs Declination (J2000)
53- 58 F6.2 aW/m2 Flux Hα+[NII] flux (uncorrected for Galactic
extinction)
60- 64 F5.2 aW/m2 e_Flux rms uncertainty on Flux
66- 68 I3 0.1nm EW Hα+[NII] equivalent width
70- 71 I2 0.1nm e_EW rms uncertainty on EW
73- 77 I5 km/s RV ?=- Radial (spectroscopic) velocity from NED
79- 84 F6.2 mag BMAG Absolute B magnitude (1)
86 I1 --- Mm [0/3] Cluster membership (0-1=secure) (2)
88 A1 --- AGN [Y] Flag for AGN candidates
90- 93 A4 --- Type Hubble type of the galaxies obtained from
the LEDA database (3)
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Note (1): from the SDSS g" magnitudes, assuming a distance to A2151 of
158.3Mpc and an average correction of g"-B~-0.3mag (Fukugita et al.,
1995PASP..107..945F 1995PASP..107..945F)
Note (2): Membership flag as follows:
0 = secure members for galaxies with spectroscopic radial velocity
1 = secure members from the photo-z criterion
2 = likely members from the photo-z criterion
3 = background galaxies
Note (3): Galaxies with no available Hubble type are classified as "Comp"
(compact).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Jan-2012