J/ApJS/242/11 Hα imaging survey of the 40% ALFALFA HI LSBGs (Lei+, 2019)
An Hα imaging survey of the low surface brightness galaxies selected from
the spring sky region of the 40% ALFALFA HI Survey.
Lei F.-J., Wu H., Zhu Y.-N., Du W., He M., Jin J.-J., Zhao P.-S.,
Zhang B.-Q.
<Astrophys. J. Suppl. Ser., 242, 11 (2019)>
=2019ApJS..242...11L 2019ApJS..242...11L
ADC_Keywords: Galaxy catalogs; Photometry, H-alpha; Photometry, SDSS;
Redshifts
Keywords: catalogs ; galaxies: star formation ; techniques: image processing
Abstract:
We present a narrow Hα-band imaging survey of 357 low surface
brightness galaxies (LSBGs) that are selected from the spring sky
region of the 40% Arecibo Legacy Fast Arecibo L-band Feed Array
(ALFALFA) HI Survey. All the Hα images are obtained from the
2.16m telescope, operated by the Xinglong Observatory of the National
Astronomical Observatories, Chinese Academy of Sciences. We provide
the Hα fluxes and derive the global star formation rates (SFRs)
of LSBGs after the Galactic extinction, internal extinction, and [NII]
contamination correction. Compared to normal star-forming galaxies,
LSBGs have a similar distribution in the HI surface density
(ΣHI), but their SFRs and star formation surface density
(ΣSFR) are much lower. Our results show that the gas-rich LSBGs
selected from the ALFALFA survey obviously deviate from the
Kennicutt-Schmidt law, in the relation between the star formation
surface density (ΣSFR) and the gas surface density (Σgas).
However, they follow the extended Schmidt law well when taking the
stellar mass of the galaxy into consideration.
Description:
Based on the selection of 1129 low surface brightness galaxies (LSBGs)
from the α.40-SDSS DR7 of Du2015 (Du+ 2015AJ....149..199D 2015AJ....149..199D),
468 Hα images of LSBGs are presented here.
Lei+ 2018ApJS..235...18L 2018ApJS..235...18L already presented the first results for 111
LSBGs in the fall sky region.
All the Hα and R images are observed using BAO Faint Object
Spectrograph and Camera instrument (BFOSC) attached to the 2.16m
telescope at the Xinglong Observatory of the National Astronomical
Observatories, Chinese Academy of Sciences (NAOC). There are 11
Hα filters whose central wavelengths range from 6533 to 7052Å
with a FWHM of ∼55Å and the Hα image observation is from 2013
to 2017.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 357 The observed sample of low surface brightness
galaxies (LSBGs)
table2.dat 70 468 The star formation properties of LSBGs
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See also:
J/A+A/324/877 : HI properties of spiral & irregular galaxies (Broeils+, 1997)
J/A+A/390/863 : CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002)
J/AJ/127/704 : Low surface brightness galaxies in SDSS (Kniazev+, 2004)
J/MNRAS/355/1303 : Rmag surface brightness of HIDEEP galaxies (Minchin+, 2004)
J/AJ/130/2613 : The Arecibo Legacy Fast ALFA survey. II (Giovanelli+, 2005)
J/A+A/458/341 : LSBG in Arecibo HI Strip Survey (Trachternach+, 2006)
J/ApJ/660/1186 : VCC galaxies classification with SDSS (Lisker+, 2007)
J/ApJS/178/247 : Hα and [NII] survey in local 11 Mpc (Kennicutt+, 2008)
J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)
J/MNRAS/403/683 : GALEX Arecibo SDSS survey (GASS) (Catinella+, 2010)
J/A+A/533/A119 : GOODS-Herschel North and South catalogs (Elbaz+, 2011)
J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011)
J/MNRAS/415/32 : COLD GASS survey (Saintonge+, 2011)
J/ApJ/733/87 : Star formation efficiency in galaxies (Shi+, 2011)
J/A+A/545/A16 : Halpha3. Catalog and SFR in Virgo cluster (Gavazzi+, 2012)
J/AJ/143/133 : Dwarf galaxies from the ALFALFA survey (Huang+, 2012)
J/A+A/553/A91 : Halpha3 survey of Virgo and Coma galaxies (Fossati+, 2013)
J/A+A/576/A16 : Hα3 V. Coma cluster (Gavazzi+, 2015)
J/A+A/611/A28 : ATLAS3D Hα imaging of early-type gal. (Gavazzi+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- UGC/AGC [4542/749510] Arecibo General Catalog
identifier (G1)
8- 12 F5.2 mag/arcsec2 mu0B [22.5/28] B-band central surface brightness
from Du+ 2015AJ....149..199D 2015AJ....149..199D
14- 18 F5.2 mag gmag [13.5/21] Apparent SDSS g-band magnitude
20- 24 F5.2 mag rmag [13.2/20.8] Apparent SDSS r-band magnitude
26- 27 I2 h RAh [7/16] Hour of Right Ascension (J2000)
29- 30 I2 min RAm Minute of Right Ascension (J2000)
32- 33 I2 s RAs Second of Right Ascension (J2000)
35- 35 A1 --- DE- [+] Sign of the Declination (J2000)
36- 37 I2 deg DEd [3/28] Degree of Declination (J2000)
39- 40 I2 arcmin DEm Arcminute of Declination (J2000)
42- 43 I2 arcsec DEs Arcsecond of Declination (J2000)
45- 50 F6.4 --- z [0.001/0.06] Spectroscopic redshift
52- 56 F5.1 Mpc Dist [2.6/233] Distance
58- 60 A3 --- Filt Filter used (Ha1 to Ha8) (1)
62- 71 A10 "Y/M/D" Date Observation date
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Note (1): There are 11 Hα filters whose central wavelengths range from
6533 to 7052Å with a FWHM of ∼55Å. More detailed information of
filters can be found in Lei et al. (2018ApJS..235...18L 2018ApJS..235...18L).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- UGC/AGC [17/749510] Arecibo General Catalog
identifier (G1)
8- 12 F5.2 kpc r25 [0.1/49.2] Elliptical photometry
semi-major axis (1)
14- 17 F4.2 --- Ell [0/0.8] Ellipticity
19- 24 F6.2 [mW/m2] logFHa [-16.7/-12]? log Hα flux;
erg/s/cm2 (2)
26- 29 F4.2 [mW/m2] E_logFHa [0.01/2]? Upper uncertainty
in logFHa
31- 34 F4.2 [mW/m2] e_logFHa [0.01/10]? Lower uncertainty
in logFHa (3)
36- 40 F5.2 [Msun/yr] logSFR [-5.3/0.7]? log of star formation
rate (4)
42- 46 F5.2 [Msun/yr/kpc2] logSigSFR [-6/-1.9]? log SFR surface density
48- 52 F5.2 [Msun] logMHI [-1.2/10] log HI mass (5)
54- 58 F5.2 [Msun/pc2] logSigHI [0.3/10.4] log HI gas surface
density (6)
60- 64 F5.2 [Msun] logM [4.4/11.3] log stellar mass (7)
66- 70 F5.2 [Msun/yr/kpc2] logSig [-0.7/2]? log mass surface density
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Note (1): The semi-major axis adopts r25, where the surface brightness
magnitude reaches to 25 mag/arcsec2.
Note (2): The Hα flux is the total flux enclosed within the ellipse
with a semi-major axis of r25 after a series of flux corrections.
Note (3): A 9.99 indicates an infinite lower uncertainty.
Note (4): Calculated from
SFRHα(M☉/yr)=7.9x10-42[L(Hα)](erg/s), where
L(Hα) is the corrected Hα luminosity
(Kennicutt 1998ApJ...498..541K 1998ApJ...498..541K).
Note (5): Taken from the α.40 catalog (Haynes+ 2011, J/AJ/142/170).
HI mass is computed vias the standard formula of
MHI=2.356x105D2MpcS21, where DMpc is the distance, and
the S21 is the integrated HI line flux density of the source in Jy.km/s
Note (6): As rHI/r25 is mostly constant (1.7±0.5) and shows weak
dependence on the types from S0 to Im, we adopt 1.7 times optical
radii of r25 as the HI radii (Broeils & Rhee 1997, J/A+A/324/877 ;
Swaters & Balcells 2002, J/A+A/390/863 and Jaskot+ 2015ApJ...808...66J 2015ApJ...808...66J).
The HI gas surface density is calculated as ΣHI=MHI/2.89πab.
Note (7): Derived from the r-band luminosity and g-r color using
Bell et al. (2003ApJS..149..289B 2003ApJS..149..289B)'s formula.
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Global notes:
Note (G1): Arecibo General Catalog, a private database of extragalactic objects
maintained by M.P. Haynes and R. Giovanelli (ID≤12934 are UGC numbers,
in Simbad). See Haynes+, 2011, J/AJ/142/170
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Dec-2019