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J/ApJ/842/133     HI-bearing ultra-diffuse ALFALFA galaxies     (Leisman+, 2017)

(Almost) dark galaxies in the ALFALFA survey: isolated H I-bearing ultra-diffuse galaxies. Leisman L., Haynes M.P., Janowiecki S., Hallenbeck G., Jozsa G., Giovanelli R., Adams E.A.K., Neira D.B., Cannon J.M., Janesh W.F., Rhode K.L., Salzer J.J. <Astrophys. J., 842, 133 (2017)> =2017ApJ...842..133L
ADC_Keywords: Galaxies, optical ; H I data ; Magnitudes, absolute ; Extinction ; Galaxies, photometry ; Morphology Keywords: galaxies: evolution; galaxies: star formation; radio lines: galaxies Abstract: We present a sample of 115 very low optical surface brightness, highly extended, HI-rich galaxies carefully selected from the ALFALFA survey that have similar optical absolute magnitudes, surface brightnesses, and radii to recently discovered "ultra-diffuse" galaxies (UDGs). However, these systems are bluer and have more irregular morphologies than other UDGs, are isolated, and contain significant reservoirs of HI. We find that while these sources have normal star formation rates for HI-selected galaxies of similar stellar mass, they have very low star formation efficiencies. We further present deep optical and HI-synthesis follow-up imaging of three of these HI-bearing ultra-diffuse sources. We measure HI diameters extending to ∼40kpc, but note that while all three sources have large HI diameters for their stellar mass, they are consistent with the HI mass-HI radius relation. We further analyze the HI velocity widths and rotation velocities for the unresolved and resolved sources, respectively, and find that the sources appear to inhabit halos of dwarf galaxies. We estimate spin parameters, and suggest that these sources may exist in high spin parameter halos, and as such may be potential HI-rich progenitors to the ultra-diffuse galaxies observed in cluster environments. Description: All sources discussed here have available SDSS and ALFALFA data. The ALFALFA observations, data reduction, and catalog products are detailed elsewhere (e.g., Giovanelli+ 2005AJ....130.2598G ; Saintonge 2007AJ....133.2087S ; Haynes+ 2011, J/AJ/142/170). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 111 115 Properties of HI-bearing ultra-diffuse ALFALFA sources (HUDS)
See also: V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/ApJS/105/209 : Low surface brightness galaxies. I. (Impey+ 1996) J/A+A/324/877 : HI properties of spiral & irregular gal. (Broeils+, 1997) J/ApJS/162/49 : UBV imaging of irregular galaxies (Hunter+, 2006) J/AJ/133/2569 : Arecibo legacy fast ALFA survey III. (Giovanelli+, 2007) J/AJ/135/588 : Arecibo legacy fast ALFA survey V. (Saintonge+, 2008) J/AJ/136/713 : Arecibo legacy fast ALFA survey. VI. (Kent+, 2008) J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008) J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008) J/ApJS/183/214 : Arecibo Legacy Fast ALFA Survey. VIII. (Martin+, 2009) J/AJ/138/338 : Arecibo Legacy Fast ALFA Survey. IX. (Stierwalt+, 2009) J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011) J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012) J/MNRAS/460/2143 : HI size-mass relation of galaxies (Wang+, 2016) J/ApJS/225/11 : Subaru-UDGs in the Coma cluster (Yagi+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- AGC [102791/749488] Arecibo General Catalog ID 8- 15 F8.4 deg RAdeg Right Ascension (J2000) 17- 23 F7.4 deg DEdeg Declination (J2000) 25- 28 I4 km/s cz [1796/8416] Recessional velocity 30- 32 I3 km/s W50 [19/215] Width of the HI line measured at the 50% flux level, corrected for channel broadening 34- 35 I2 km/s e_W50 [2/59] W50 error 37- 40 F4.2 Jy.km/s SdV [0.3/3.5] HI line flux density 42- 45 F4.2 Jy.km/s e_SdV [0.02/0.1] Flux density error 47- 49 I3 Mpc Dist [28/120] Distance from ALFALFA flow model (1) 51- 54 F4.2 [Msun] logMHI [7.9/9.5] HI mass 56- 59 F4.2 [Msun] e_logMHI [0.05/0.2] HI mass error (1) 61- 65 F5.2 mag/arcsec2 mug0 [23/25.4] g-band central surface brightness (2) 67- 70 F4.2 mag/arcsec2 e_mug0 [0.1/0.4] g-band central SB error 72- 74 F3.1 kpc rh [1.6/8] Half light radius 76- 78 F3.1 kpc e_rh [0.2/3.3] Half light radius error (1) 80- 84 F5.1 mag gMAG [-17.1/-13.9] g-band absolute magnitude (3) 86- 88 F3.1 mag e_gMAG [0.3/1.1] gMAG error (1) 90- 94 F5.2 mag g-r [-0.2/0.9] g minus r color index (2) 96- 99 F4.2 mag e_g-r [0.1/2] g-r color error 101-104 F4.2 mag Ag [0.05/0.8] g band galactic extinction (4) 106-109 F4.2 mag Ar [0.03/0.6] r band galactic extinction (4) 111 A1 --- Set Broad (B) or Restrictive (R) Sample
Note (1): Distance dependent quantity errors include an assumed distance error of 350km/s or 5Mpc. Note (2): Not corrected for galactic dust extinction Note (3): g-band absolute magnitudes are calculated from total integrated magnitudes from the surface brightness profile using the ALFALFA flow model distance. These total magnitudes are not truncated, and are significantly brighter than aperture magnitudes. USE WITH CAUTION. Note (4): Galactic dust extinction corrections are derived from the Schlafly & Finkbeiner (2011ApJ...737..103S) recalibration of the Schlegel et al. (1998ApJ...500..525S) COBE and IRAS dust maps, and assume Rv=3.1. They are included simply as a convenience to the reader.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Feb-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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