J/AJ/158/234 ALFAZOA Shallow Survey galaxy properties (Sanchez-Barrantes+, 2019)
The Arecibo L-band Feed Array Zone of Avoidance (ALFAZOA) Shallow Survey.
Sanchez-Barrantes M., Henning P.A., McIntyre T., Momjian E., Minchin R.,
Rosenberg J.L., Schneider S., Staveley-Smith L., van Driel W., Ramatsoku M.,
Butcher Z., Vaez E.
<Astron. J., 158, 234 (2019)>
=2019AJ....158..234S 2019AJ....158..234S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galaxies, radio ; H I data ; Surveys
Keywords: catalogs ; galaxies: distances and redshifts ;
galaxies: fundamental parameters ;
large-scale structure of the universe ; surveys
Abstract:
The Arecibo L-band Feed Array Zone of Avoidance (ALFAZOA) Shallow Survey
is a blind H I survey of the extragalactic sky behind the northern
Milky Way conducted with the ALFA receiver on the 305 m Arecibo Radio
Telescope. ALFAZOA Shallow covered 900 square degrees at full sensitivity
from 30°=<l=<75° and |b|=<10° and an additional 460 square
degrees at limited sensitivity at latitudes up to 20°. It has an rms
sensitivity of 5-7 mJy and a velocity resolution of 9-20.6 km/s, and
detected 403 galaxies out to a recessional velocity of 12000 km/s, with
an angular resolution of 3.4' and a positional accuracy between 0.2' and
1.7'. The survey is complete above an integrated line flux of
FHI=2.0 Jy km/s for half the survey, and above FHI= 2.8 Jy km/s for
the other half. Of the ALFAZOA H I detections, 43% have at least one
possible optical/near-infrared counterpart in the literature, and an
additional 16% have counterparts that only included previous H I
measurements. There are fewer counterparts in regions of high extinction
and for galaxies with lower H I mass. Comparing the results of the survey
to the predictions of Erdogdu et al. (2006MNRAS.373...45E 2006MNRAS.373...45E), and using
their nomenclature, ALFAZOA confirms the position and extent in the ZOA
of the C7, Cζ, Pegasus, Corona Borealis, and Delphinus structures,
but not of the Cygnus void. Two new structures are identified, both
connected to the C7 overdensity; one extends to 35°, and the other
crosses the ZOA.
Description:
The observations described here were carried out with the Arecibo L-band
Feed Array (ALFA) on the 305 m telescope located in Arecibo, Puerto Rico,
from 2008 May to 2009 August. The total observing time was 322 hr, and
the survey was observed simultaneously with other astronomical projects.
The ALFAZOA Shallow Survey covers about 1200 square degrees at optimal
sensitivity (full and complete coverage) and an additional 160 square
degrees at limited sensitivity between 30°=<l=<75° and |b|=<15°
(Figure 1). The survey presented here covers four different areas of
the sky: A, B, C, and D, each covering a different region of the sky
(Figure 1). The Shallow Survey used two different spectrometer backends
at different times over the course of the observations; the Wideband
Arecibo Pulsar Processor (WAPP) and the Mock spectrometer. Fields A and D
were observed in 2008 using the WAPP spectrometer with 2048 channels and
covering a frequency range from 1330 MHz to 1430 MHz. Fields B and C were
observed in 2009 using the Mock spectrometer with 8192 channels and
a bandwidth from 1225 to 1525 MHz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 403 Properties of ALFAZOA galaxies
table3.dat 77 294 Possible ALFAZOA counterparts
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See also:
J/AJ/129/220 : HI Parkes Zone of Avoidance Survey (Donley+, 2005)
J/A+A/505/29 : HI observations of 2MASS galaxies in ZoA (van Driel+, 2009)
J/AJ/139/2130 : ALFA-ZOA precursor observation (Henning+, 2010)
J/MNRAS/443/41 : Deep NIR photometry of HI galaxies in ZoA (Williams+, 2014)
J/AJ/151/52 : The HIZOA-S survey (Staveley-Smith+, 2016)
J/MNRAS/457/2366 : Southern ZOA galaxies 21cm HI-line (Said+, 2016)
J/MNRAS/482/5167 : The 2M-ZoA galaxy catalogue (Schroder+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- ALFAZOA Galaxy name in ALFAZOA Shallow Survey
(JHHMM+DDMMa)
13- 15 A3 --- f_ALFAZOA Flag on ALFAZOA (1)
17- 18 I2 h RAh Hour of Right Ascension (J2000)
20- 21 I2 min RAm Minute of Right Ascension (J2000)
23- 24 I2 s RAs Second of Right Ascension (J2000)
26 A1 --- DE- Sign of the Declination (J2000)
27- 28 I2 deg DEd Degree of Declination (J2000)
30- 31 I2 arcmin DEm Arcminute of Declination (J2000)
33- 34 I2 arcsec DEs Arcsecond of Declination (J2000)
36 A1 --- u_DEs [:] Flag indicating source is on edge of
survey and could not be completely recovered
38- 41 F4.1 deg GLON [27.4/84.3] Galactic longitude
43- 47 F5.1 deg GLAT [-17.1/21.9] Galactic latitude
49- 53 F5.1 Jy.km/s Flux [0.3/82]? Integrated HI flux
55 A1 --- f_Flux [a] Flag indicating source is from A and D
57- 59 F3.1 Jy.km/s e_Flux [0.1/7]? Uncertainty in Flux
61- 65 I5 km/s HRV [237/11840] Heliocentric velocity of HI
profile midpoint
67- 68 I2 km/s e_HRV [2/29]? Uncertainty in HRV
70- 72 I3 km/s w50 [16/627]? Velocity width of HI spectral
profile at 50% of peak flux density
74- 75 I2 km/s e_w50 [3/58]? Uncertainty in w50
77- 79 I3 km/s w20 [37/644]? Velocity width of HI spectral
profile at 20% of peak flux density
81- 82 I2 km/s e_w20 [4/87]? Uncertainty in w20
84- 88 F5.1 Mpc DLG [4.5/171.7]? Distance in Local Group
reference frame
90- 93 F4.1 [Msun] logMHI [6.3/10.5]? Logarithm of total HI mass
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Note (1): Flag as follows:
a = Marks possibly confused source that might be more than 1 galaxy;
e = Indicates that source is extended.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- ALFAZOA Galaxy name in ALFAZOA Shallow Survey
(JHHMM+DDMMa)
13- 16 F4.1 deg GLON [27.5/84.3] Galactic longitude
18- 22 F5.1 deg GLAT [-17.1/21.9] Galactic latitude
24- 28 F5.2 mag AB [0.29/58.33] Foreground extinction in
the B band AB
30- 57 A28 --- Name Counterpart galaxy identifier (1)
59 A1 --- f_Name [k] Flag on Name (2)
61 A1 --- I [I] NED identification of previous IR
observation
63 A1 --- O [O] NED identification of previous optical
observation
65 A1 --- H [H] NED identification of previous HI line
observation
67- 70 F4.2 arcmin Sep [0.05/3.64] Angular seperation (3)
72- 75 I4 km/s dv [-231/135]? Separation in velocity δv (4)
77 I1 --- f_dv [1/6]? Flag on dv (5)
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Note (1): The foremost name used in NED.
Note (2): Flag as follows:
k = The galaxy was observed in Kraan-Korteweg et al. (2018MNRAS.481.1262K 2018MNRAS.481.1262K),
with their recorded velocity.
Note (3): Distance between the HI centroid and the counterpart.
Note (4): Between ALFAZOA HI heliocentric velocity and the recorded velocity in
the literature (where available).
Note (5): Flag as follows:
1 = The literature velocity appears offset from the published spectrum and
closer to the ALFAZOA value;
2 = This galaxy has a previously measured H I velocity that matches ours;
3 = This galaxy has an optical redshift;
4 = This galaxy has a line width of 400 km/s;
5 = This galaxy is at the edge of the survey region and is not recovered
completely;
6 = This galaxy, due to its low-SNR HI profile in ALFAZOA, only clearly shows
one horn, which offsets its central HI position.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 24-Jan-2020