J/A+A/545/A16 Halpha3. Catalog and SFR in Virgo cluster (Gavazzi+, 2012)
Halpha3: Hα imaging survey of HI selected galaxies from ALFALFA.
I: Catalogue in the Local Supercluster.
Gavazzi G., Fumagalli M., Galardo V., Grossetti F., Boselli A.,
Giovanelli R., Haynes M.P., Fabello S.
<Astron. Astrophys. 545, A16 (2012)>
=2012A&A...545A..16G 2012A&A...545A..16G
ADC_Keywords: Clusters, galaxy ; H I data ; Equivalent widths
Keywords: galaxies: clusters: individual: Virgo -
galaxies: fundamental parameters - galaxies: ISM
Abstract:
We present Hα3 (acronym for Hα-αα), an Hα
narrow-band imaging survey of ∼400 galaxies selected from the HI
Arecibo Legacy Fast ALFA Survey (ALFALFA) in the Local Supercluster,
including the Virgo cluster. By using hydrogen recombination lines
as a tracer of recent star formation, we aim to investigate the
relationships between atomic neutral gas and newly formed stars in
different environments (cluster and field), morphological types
(spirals and dwarfs), and over a wide range of stellar masses
(∼107.5-1011.5M☉).
We image in Hα+[NII] all the galaxies that contain more than
107M☉ of neutral atomic hydrogen in the sky region
11h<R.A.<16h ; 4°<Dec.<16°; 350<cz<2000km/s using the San
Pedro Martir 2m telescope. This survey provides a complete census of
the star formation in HI rich galaxies of the local universe.
We present the properties of the galaxy sample, together with
Hα fluxes and equivalent widths. We find an excellent agreement
between the fluxes determined from our images in apertures of 3-arcsec
diameter and the fluxes derived from the SDSS spectral database. From
the Hα fluxes corrected for galactic and internal extinction and
for [NII] contamination we derive the global star formation rates (SFRs).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 87 235 Basic data of the 235 target galaxies
tableb2.dat 57 235 Hα observational specifications
tableb3.dat 74 235 Integrated Hα photometric parameters
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See also:
VII/266 : Atlas of Virgo galaxies (McDonald+ 2011)
J/A+A/396/449 : Hα surface photometry in Virgo (Gavazzi+, 2002)
J/AJ/131/716 : Hα scale length in Virgo & field spirals (Koopmann+ 2006)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- AGC AGC name
7 A1 --- m_AGC [+] Multiplicity index on AGC
9- 10 I2 h RAh Right Ascension (J2000)
12- 13 I2 min RAm Right Ascension (J2000)
15- 18 F4.1 s RAs Right Ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 28 I2 arcsec DEs Declination (J2000)
30- 35 I6 --- CGCG ? CGCG (Cat. VII/49) name
37- 41 I5 --- UGC ? UGC (Cat. VII/26) name
43- 46 I4 --- NGC ? NGC (Cat. VII/118) name
48- 51 I4 --- IC ? IC (Cat. VII/118) name
53- 59 A7 --- MType Morphological type
60- 63 I4 km/s cz Heliocentric velocity
65- 68 F4.1 arcmin a ? Major Axis
70- 72 F3.1 arcmin b ? Minor Axis
74- 77 F4.1 mag imag ? i-band magnitude
79- 82 F4.1 mag gmag ? g-band magnitude
84- 87 F4.1 Mpc Dist ? Distance
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- AGC AGC name
7 A1 --- m_AGC [+] Multiplicity index on AGC
9- 18 A10 "YYYY-MM-DD" Date Observing date
20- 23 I4 s Ton Exposure time (ON frame)
25 I1 --- o_Ton Number of exposures (ON frame)
27- 30 F4.2 --- AirM Air mass (ON frame)
32- 37 F6.2 mW/m2 Zp Photometric Zero point (ON frame)
39- 41 F3.1 arcsec Son Seeing (ON frame)
43- 45 I3 sec Toff Exposure time (OFF frame)
47 I1 --- o_Toff Number of exposures (OFF frame)
49- 51 F3.1 arcsec Soff f Seeing (OFF frame)
53- 57 F5.3 --- n Normalization coefficient
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Byte-by-byte Description of file: tableb3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- AGC AGC name
7 A1 --- m_AGC [+] Multiplicity index on AGC
9- 10 I2 h RAh Right Ascension (J2000)
12- 13 I2 min RAm Right Ascension (J2000)
15- 18 F4.1 s RAs Right Ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 28 I2 arcsec DEs Declination (J2000)
30- 35 F6.2 0.1nm EWHa ? Hα EW
37- 41 F5.2 0.1nm e_EWHa Uncertainty on HaEW
43 A1 --- l_logF(Ha) Limit flag on logF(Ha)
44- 49 F6.2 [mW/m2] logF(Ha) log of Hα flux
51- 54 F4.2 [mW/m2] e_logF(Ha) ? Uncertainty on log of Hα flux
56 A1 --- l_logSFR Limit flag on logSFR
57- 61 F5.2 [Msun/yr] logSFR ? Stellar formation rate, uncorrected for
internal extinction
63 A1 --- l_logSFRc Limit flag on logSFRc
64- 68 F5.2 [Msun/yr] logSFRc ? Stellar formation rate, corrected for
internal extinction
69 A1 --- Note [*] *: corrected for Balmer decrement
71 A1 --- Qual [PT] Photometric quality (P=phot T=transp)
73- 74 I2 --- Fig ? Atlas Figure number
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Acknowledgements:
Giuseppe Gavazzi, giuseppe.gavazzi(at)mib.infn.it
(End) Patricia Vannier [CDS] 31-May-2012