J/ApJS/178/247 Hα and [NII] survey in local 11 Mpc (Kennicutt+, 2008)
An Hα imaging survey of galaxies in the local 11 Mpc volume.
Kennicutt R.C.Jr, Lee J.C., Funes J.G., Sakai S., Akiyama S.
<Astrophys. J. Suppl. Ser., 178, 247-279 (2008)>
=2008ApJS..178..247K 2008ApJS..178..247K
ADC_Keywords: Galaxies, nearby ; Equivalent widths ; Radial velocities ;
Extinction ; Morphology ; Magnitudes ; Surveys
Keywords: catalogs - galaxies: evolution - galaxies: ISM - H II regions
stars: formation
Abstract:
As part of a broader effort to characterize the population of
star-forming galaxies in the local universe, we have carried out an
Hα+[NII] imaging survey for an essentially volume-limited
sample of galaxies within 11Mpc of the Milky Way. This first paper
describes the design of the survey, the observation, data processing,
and calibration procedures, and the characteristics of the galaxy
sample. The main product of the paper is a catalog of integrated
Hα fluxes, luminosities, and equivalent widths for the galaxies
in the sample. We briefly discuss the completeness properties of the
survey and compare the distribution of the sample and its star
formation properties to other large Hα imaging surveys. These
data form the foundation for a series of follow-up studies of the star
formation properties of the local volume, and the properties and duty
cycles of star formation bursts in dwarf galaxies.
Description:
Most of the Hα and R imaging reported in this paper was obtained
in 2001-2004 using CCD direct imagers on the Steward Observatory Bok
2.3m telescope on Kitt Peak (Bok), the Lennon 1.8m Vatican Advanced
Technology Telescope (VATT), and the 0.9m telescope at Cerro Tololo
Interamerican Observatory (CTIO).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 436 Galaxy sample
table3.dat 85 436 Integrated Hα+[NII] fluxes and equivalent
widths
refs.dat 113 85 References for table1
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See also:
J/ApJS/126/331 : Spectrophotometry of nearby field galaxies (Jansen+, 2000)
J/ApJS/147/29 : Blue compact dwarf galaxies BRHalpha data (Gil De Paz+, 2003)
J/AJ/127/2031 : Catalog of neighboring galaxies (Karachentsev+, 2004)
J/A+A/414/23 : CCD Hα and R photometry of 334 galaxies (James+, 2004)
J/MNRAS/359/930 : CUYS survey of Ha+NII ELG galaxies (Bongiovanni+, 2005)
J/AJ/130/2571 : KISS Hα-selected survey list 3 (Jangren+, 2005)
J/ApJS/164/81 : Spectrophotometry of nearby galaxies (Moustakas+, 2006)
J/ApJ/636/214 : HII regions in dwarf irregular galaxies (van Zee+, 2006)
J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Running index number
5- 18 A14 --- Name Galaxy name
20 A1 --- n_Name [ps] Primary or Seconday sample (1)
22- 23 I2 h RAh Hour of Right Ascension (J2000) (2)
25- 26 I2 min RAm Minute of Right Ascension (J2000) (2)
28- 31 F4.1 s RAs Second of Right Ascension (J2000) (2)
33 A1 --- DE- Sign of the Declination (J2000) (2)
34- 35 I2 deg DEd Degree of Declination (J2000) (2)
37- 38 I2 arcmin DEm Arcminute of Declination (J2000) (2)
40- 41 I2 arcsec DEs Arcsecond of Declination (J2000) (2)
43- 48 F6.2 deg GLat Galactic latitude (2)
50- 51 I2 --- TT Morphological T-type on the RC3 system (3)
53- 57 F5.2 mag Bmag Apparent B band magnitude
59- 62 F4.2 mag e_Bmag ? Uncertainty in Bmag
64- 67 I4 km/s cz Heliocentric recessional velocity (4)
69- 72 I4 km/s vLG Flow-field corrected recessional velocity (5)
74- 78 F5.2 Mpc Dist Adopted distance (6)
80- 86 A7 --- n_Dist Method used to determine Dist (7)
88- 94 A7 --- Ref Distance and magnitude reference(s). See
refs.dat file (8)
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Note (1): Members of our primary and secondary samples are designated by p and
s, respectively. The primary sample is comprised of galaxies with
Dist≤11Mpc, |b|≥20°, B≤15 and RC3 type T≥0.
Note (2): As reported in NED in 2005 June.
Note (3): As reported in the HyperLeda database in 2005 June. Classifications
from NED were adopted for 12 dwarf galaxies that do not have assigned
types in Hyperleda. Further, blue compact dwarf galaxies (HII
galaxies) often are misclassified as elliptical galaxies. Seventeen
galaxies in our sample which also are part of the
Palomar/Las Campanas Altas of BCDs (Gil de Paz et al. 2003,
Cat. J/ApJS/147/29) were checked and reassigned a classification
code of 11 (compact irregular).
Note (4): As reported in NED in 2008 February.
Note (5): Based on the Karachentsev & Makarov (1996AJ....111..794K 1996AJ....111..794K) Local
Group flow model, as described in Section 2.
Note (6): Direct measurements from the literature were adopted when available,
and were mostly taken from the KKHM compilation, or from measurements
reported in Ferrarese et al. (2000ApJS..128..431F 2000ApJS..128..431F) and Freedman et
al. (2001ApJ...553...47F 2001ApJ...553...47F). If direct measurements were not available,
distances were computed from the flow corrected velocities listed in
Column vLG, using H0=75km/s/Mpc.
Note (7): Method used to determine the distance as follows:
ceph = Cepheid variables;
trgb = tip of the red giant branch;
sbf = surface brightness fluctuations;
mem = membership in a group with a direct distance measurement;
bs = brightest blue stars;
tf = Tully-Fisher relation;
v(flow) = Virgocentric flow model distances.
Note (8): Distance references are numbered 1-62 and photometry references are
numbered 100-122.
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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- 3 I3 --- Seq Running index number (1)
5- 18 A14 --- Name Galaxy name
20 A1 --- l_logf Limit flag on logf
21- 26 F6.2 [mW/m2] logf ? Integrated Hα+[NII] emission-line flux
28- 32 F5.3 [mW/m2] e_logf ? The 1σ error in logf
34 A1 --- l_EW Limit flag on EW
35- 41 F7.3 0.1nm EW ? Integrated Hα+[NII] emission-line
equivalent width
43- 46 F4.1 0.1nm e_EW ? The 1σ error in EW
48- 50 F3.1 --- n_EW Source of flux and EW measurements (2)
52- 55 A4 --- Tel Telescope + filter used for imaging (3)
57- 59 F3.1 --- Cover ? Spatial coverage code for the imaging (4)
61- 64 F4.2 mag AB B band Galactic foreground extinction (5)
66- 71 F6.2 mag BMAG Absolute B band magnitude (6)
73- 76 F4.2 --- NII/Ha Adopted integrated [NII] (6548+6583) to
Hα ratio
78 I1 --- r_NII/Ha Reference for NII/Ha (7)
80 A1 --- l_LHa Limit flag on LHa
81- 85 F5.2 [10-7W] LHa ? Log of integrated Hα luminosity (8)
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Note (1): The fluxes, equivalent widths, and luminosities for NGC 1800 and its
companion MCG-05-13-004 were measured together within a single
aperture.
Note (2): Sources of flux and EW measurements as follows:
1.1 = Measurements and errors are based on new observations which were made
under photometric conditions (228 galaxies).
1.2 = Measurements and errors are based on new observations which were
obtained initially in non-photometric conditions, but were
subsequently calibrated with short exposures obtained under
photometric conditions (50 galaxies). The photometric precision of
these fluxes should be excellent but the signal/noise in the images
may be slightly degraded relative to the main set of observations.
1.3 = Primary measurements are new observations made under non-photometric
conditions, but with flux zeropoints bootstrapped from measurements
in the literature. For these galaxies the listed EWs were measured
from the our images (26 galaxies).
2.1 = Flux and EW measurements were taken from the literature, using the
compilation of Kennicutt et al., 2008 (in prep). Uncertainties are
derived from the dispersion of multiple measurements when these are
available, or from the uncertainty cited in the original source for
single measurements. Otherwise a 10% estimated uncertainty (0.04dex)
is applied (57 galaxies).
2.2 = Flux measurements were taken from the literature compilation of
Kennicutt et al., 2008 (in prep) as above. However published EW
measurements are not available. In these cases we used published
Hα+[NII] line fluxes and broadband photometry to estimate the
continuum flux and emission-line EW, following procedures detailed in
Kennicutt et al., 2008 (in prep). These estimated equivalent widths
have an uncertainty of ±25%, based on comparisons to galaxies with
directly measured EWs. (25 galaxies)
2.3 = Flux values were adopted from the compilation of Kennicutt et al.,
2008 (in prep). EWs are not available and cannot be estimated
because of the lack of broadband photometry (24 galaxies). Many of
these galaxies are recently identified dwarfs from the surveys of
Karachentsev et al. (KKHM, 2004, Cat. J/AJ/127/2031
and references therein).
Note (3): As listed in Table 2:
-----------------------------------------------------------------------------
Telescope Detector CCD Scale FOV Continuum Filter Line Filter Exp Times
arcsec arcmin Å Å s
-----------------------------------------------------------------------------
Bok 2.3m Loral 2kx2k 0.43 4.9 6451/1473 6585/66 1000/200
VATT 1.8m Loral 2kx2k 0.40 6.4 6338/1186 6585/66 1800/360
6600/69
CTIO 0.9m Tek 2kx2k 0.79 13.5 6425/1500 6563/75 2700/360
6600/75
-----------------------------------------------------------------------------
If no telescope is listed the measurements were taken from the
literature, as compiled by Kennicutt et al., 2008 (in prep).
Note (4): Spatial coverage code as follows:
1.0 = The boundaries of the star-forming regions are clearly seen and the
nebular emission has been completely sampled (266 galaxies).
2.0 = The main star-forming disk is enclosed by the field of view, but faint
outlying HII regions or low surface brightness features may fall
outside of the field. In most cases the missing flux components should
contribute less than 5% of the listed flux (26 galaxies).
3.0 = The images do not fully cover the main star-forming disk, so the
fluxes listed are lower limits (16 galaxies).
Note (5): The values listed are an average of the values based on the maps of
Burstein & Heiles (1982AJ.....87.1165B 1982AJ.....87.1165B) and Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S), when both are available. We adopted
independently measured foreground extinctions from the literature for
three galaxies that lie near the Galactic plane (IC 10, Maffei 2,
Circinus), because the Schlegel et al. values become unreliable in
these regions. Sources were Richer et al. (2001A&A...370...34R 2001A&A...370...34R) for
IC10, Fingerhut et al. (2003ApJ...587..672F 2003ApJ...587..672F, 2007,
Cat. J/ApJ/655/814) for Maffei 1 and 2, respectively, and Freeman et
al. (1977A&A....55..445F 1977A&A....55..445F) for Circinus.
Note (6): Based on the (apparent) B magnitude and distance given in Table 1.
These are corrected for foreground Galactic extinction as listed
in column AB.
Note (7): References for NII/Ha as follows:
1 = Integrated spectrophotometry of the galaxies from
Moustakas & Kennicutt (2006, Cat. J/ApJS/164/81) or Jansen et al.
(2000, Cat. J/ApJS/126/331);
2 = Spectrophotometry of HII regions in the galaxies, as compiled from
van Zee & Haynes (2006, Cat. J/ApJ/636/214) and references therein.
In cases where multiple HII regions were observed we averaged the
[NII]/Hα values.
3 = If measurements were not available from one of these sources, then the
ratio was estimated using an empirical scaling relation between
[NII](6584)/Hα and BMag, as described in Appendix B.
Note (8): It is derived using the Hα+[NII] flux listed in Column
BMag, the distance listed in Table 1, and Galactic foreground
extinction, assuming AHα=0.6AB, and the [NII]/Hα ratio
listed in Column NII/Ha. No corrections for extinction internal to the
galaxies themselves has been applied here. Note that for galaxies in
this volume typical uncertainties in distances are of order ±10-20%,
which introduces corresponding uncertainties in absolute luminosities
of roughly ±0.07-0.15dex.
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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- 3 I3 --- Ref Reference number
5- 23 A19 --- BibCode Bibcode
25- 52 A28 --- Aut Author's name
54-113 A60 --- Com Comment
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History:
From electronic version of the journal
References:
Lee et al. Paper II. 2011ApJS..192....6L 2011ApJS..192....6L Cat. J/ApJS/192/6
Lee et al. Paper III. 2009ApJ...706..599L 2009ApJ...706..599L Cat. J/ApJ/706/599
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Dec-2009