J/A+A/576/A16 Hα3 V. Coma cluster (Gavazzi+, 2015)
Hα3: an Hα imaging survey of HI-selected galaxies from ALFALFA.
V. The Coma supercluster survey completion.
Gavazzi G., Consolandi G., Viscardi E., Fossati M., Savorgnan G.,
Fumagalli M., Gutierrez L., Hernandez-Toledo H., Boselli A., Giovanelli R.,
Haynes M.P.
<Astron. Astrophys., 576, A16-16 (2015)>
=2015A&A...576A..16G 2015A&A...576A..16G
ADC_Keywords: Clusters, galaxy ; Photometry, SDSS ; Photometry, H-alpha
Keywords: galaxies: clusters: individual: Coma -
Galaxy: fundamental parameters - galaxies: ISM
Abstract:
Neutral hydrogen represents the major observable baryonic constituent
of galaxies that fuels the formation of stars through transformation
of molecular hydrogen. The emission of the hydrogen recombination line
Hα is the most direct tracer of the process that transforms gas
(fuel) into stars. We continue to present Hα3 (acronym for
Hα-αα), an extensive Hα+[NII] narrow-band
imaging campaign of galaxies selected from the HI Arecibo Legacy Fast
ALFA Survey (ALFALFA), using the instrumentation available at the San
Pedro Martir (SPM) observatory (Mexico). In 48 nights since 2011 we
were able to carry out the Hα imaging observations of 724
galaxies in the region of the Coma supercluster 10h<RA<16h ;
24°<Dec<28° and 3900<cz<9000km/s. Of these, 603 are selected
from the ALFALFA and constitute a 97% complete sample. They provide
for the first time a complete census of the massive star formation
properties of local gas-rich galaxies belonging to different
environments (cluster vs. filaments), morphological types (spirals vs.
dwarf Irr), over a wide range of stellar mass
(∼108-1011.5M☉) in the Coma supercluster. The present Paper
V provides Hα data and derived star formation rates for the
observed galaxies.
Description:
Our sample is drawn from the 360-square degree region 10h<RA<16h;
24°<Dec<28°; 3900<cz<9000km/s, covering the Coma supercluster,
including half of the Coma cluster. This region has been fully mapped
by ALFALFA (Haynes et al., 2011, Cat. J/AJ/142/170), which provides us
with a complete sample of HI selected galaxies, with HI masses as low
as 109-9.5M☉. The goal of the Hα3 survey is to follow up
with Hα imaging observations the ALFALFA targets with high
signal-to-noise ratio (typically S/N>6.5), and with consistent
detection between two independent polarizations (code=1 sources in
Haynes et al., 2011, Cat. J/AJ/142/170). We will refer to these
targets as the HI or radio targets.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 104 724 Basic data of the 724 target galaxies
tablea2.dat 90 724 Hα observational specifications of the
724 target galaxies
tablea3.dat 93 724 Integrated Hα photometric parameters of
the 724 target galaxies
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See also:
J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011)
J/A+A/545/A16 : Halpha3. Catalog and SFR in Virgo cluster (Gavazzi+, 2012)
J/A+A/553/A91 : Halpha3 survey of Virgo and Coma galaxies (Fossati+, 2013)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
5- 20 A16 --- SDSS SDSS name (JHHMMSS.s+DDMMSS)
22- 27 I6 --- AGC ?=- AGC ID (Haynes et al. 2011, J/AJ/142/170)
29- 34 I6 --- CGCG ?=- CGCG ID (Zwicky FFFNNN; see VII/190)
36- 37 I2 h RAh Right ascension (J2000)
39- 40 I2 min RAm Right ascension (J2000)
42- 46 F5.2 s RAs Right ascension (J2000)
48 A1 --- DE- Declination sign (J2000)
49- 50 I2 deg DEd Declination (J2000)
52- 53 I2 arcmin DEm Declination (J2000)
55- 58 F4.1 arcsec DEs Declination (J2000)
60- 63 A4 --- MType Morphological type
65- 70 F6.1 km/s cz [3970/9503] Heliocentric redshift
72- 78 F7.3 arcsec a [8/196] Major axis
79- 85 F7.3 arcsec b [4/132] Minor axis
87- 91 F5.2 mag gmag [12.8/21.6] SDSS g magnitude
93- 97 F5.2 mag imag [11.5/18.7] SDSS i magnitude
99-104 F6.2 Mpc Dist [12/129] Distance
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Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
5- 20 A16 --- SDSS SDSS name (JHHMMSS.s+DDMMSS)
22- 27 I6 --- AGC ?=- AGC ID (Haynes et al. 2011, J/AJ/142/170)
29- 34 I6 --- CGCG ?=- CGCG ID (Zwicky FFFNNN; see VII/190)
36- 45 A10 "date" ObsDate Observation date
47- 50 I4 0.1nm Filt [6643/6730] Central wavelength of the adopted
ON-band filter (1)
52- 55 I4 s t.on ON-band exposure time
57 I1 --- N.on ON-band number of exposures
59- 63 F5.3 --- AM Average airmass during the ON-band exposures
65- 70 F6.2 [mW/m2] logZp ?=- Adopted photometric zero point
72- 74 F3.1 arcsec See.on [1/5] FWHM of point source, as measured on the
ON-band frame
76- 79 I4 s t.off OFF-band exposure time
81 I1 --- N.off OFF-band number of exposures
83- 85 F3.1 arcsec See.off [1/5] FWHM of point source as measured on the
OFF-band fram
87- 90 F4.2 --- n [0.08/1.2] Normalization factor of the
OFF-band frame
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Note (1): the ON-band filters consist in a set of ∼80Å-wide interferometric
filters centered at 6643, 6650, 6683, 6690, 6723 and 6730Å.
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Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
5- 20 A16 --- SDSS SDSS name (JHHMMSS.s+DDMMSS)
22- 27 I6 --- AGC ?=- AGC ID (Haynes et al. 2011, J/AJ/142/170)
29- 34 I6 --- CGCG ?=- CGCG ID (Zwicky FFFNNN; see VII/190)
36- 37 I2 h RAh Right ascension (J2000)
39- 40 I2 min RAm Right ascension (J2000)
42- 46 F5.2 s RAs Right ascension (J2000)
48 A1 --- DE- Declination sign (J2000)
49- 50 I2 deg DEd Declination (J2000)
52- 53 I2 arcmin DEm Declination (J2000)
55- 58 F4.1 arcsec DEs Declination (J2000)
60- 66 F7.3 0.1nm EWHa [-18/182] Hα+[NII] equivalent width
67- 71 F5.2 0.1nm e_EWHa rms uncertainty on EWHa
73- 78 F6.2 [mW/m2] logFHa [-15.3/-11.9]?=- Hα+[NII] flux
80- 83 F4.2 [mW/m2] e_logFHa ?=- rms uncertainty on logFHa
85- 90 F6.3 [Msun/yr] logSFR [-2.6/0.8]?=- Star formation rate (2)
92- 93 A2 --- Qf [PN *] Quality flags, P=photometric (3)
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Note (2): corrected for galactic extinction, deblending from [NII] and internal
extinction as adopted by Lee et al. (2009, Cat. J/ApJ/706/599).
Note (3): Sky quality flag as follows:
P = photometric
N = non photometric
* = marks galaxies with uncertain fluxes because the transmissivity of
the used ON band filter at their redshift was less than 50%
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History:
From electronic version of the journal
References:
Gavazzi et al., Paper I 2012A&A...545A..16G 2012A&A...545A..16G, Cat. J/A+A/545/A16
Gavazzi et al., Paper II 2013A&A...553A..89G 2013A&A...553A..89G
Gavazzi et al., Paper III 2013A&A...553A..90G 2013A&A...553A..90G
Fossati et al., Paper IV 2013A&A...553A..91F 2013A&A...553A..91F, Cat. J/A+A/553/A91
(End) Patricia Vannier [CDS] 26-May-2015