J/MNRAS/489/2907 The EZOA survey (Schroder+, 2019)
EZOA - a catalogue of EBHIS H I-detected galaxies in the northern
Zone of Avoidance.
Schroeder A.C., Floer L., Winkel B., Kerp J.
<Mon. Not. R. Astron. Soc., 489, 2907-2922 (2019)>
=2019MNRAS.489.2907S 2019MNRAS.489.2907S (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; H I data
Keywords: galaxies: distances and redshifts - galaxies: fundamental parameters -
large-scale structure of the universe - surveys -
radio lines: galaxies
Abstract:
We present a catalogue of galaxies in the northern Zone of Avoidance
(ZoA), extracted from the shallow version of the blind HI survey with
the Effelsberg 100m radio telescope, EBHIS, that has a sensitivity of
23mJy/beam at 10.24km/s velocity resolution. The catalogue comprises
170 detections in the region Dec≥-5° and |b|<6°. About a
third of the detections (N=67) have not been previously recorded in
HI. While 29 detections have no discernible counterpart at any
wavelength other than HI, 48 detections (28%) have a counterpart
visible on optical or NIR images but are not recorded as such in the
literature. New HI detections were found as close as 7.5Mpc
(EZOA J2120+45), and at the edge of the Local Volume, at 10.1Mpc, we
have found two previously unknown dwarf galaxies (EZOA J0506+31 and
EZOA J0301+56). Existing large-scale structures crossing the northern
ZoA have been established more firmly by the new detections, with the
possibility of new filaments. We conclude that the high rate of 39%
new HI\detections in the northern ZoA, which has been extensively
surveyed with targeted observations in the past, proves the power of
blind HI surveys. The full EBHIS survey, which will cover the full
northern sky with a sensitivity comparable to the HIPASS survey of the
southern sky, is expected to add many new detections and uncover new
structures in the northern ZoA.
Description:
The observations described here were taken with the 21cm multibeam
receiver at the 10m Effelsberg radio telescope as a first of two runs
of the Effelsberg-Bonn HI Survey (EBHIS), having a sensitivity of
23mJy/beam at a velocity resolution of 10km/s. Sources were extracted
for the region of the northern Zone of Avodance (DEC>-5°,
|b|<6°) in the velocity range -500≤cz≤12500km/s.
Table 2 lists the HI parameters and derived quantities for the
galaxies. The counterparts are listed in Table 3. The notes give
details on some of the detections and counterparts.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 136 170 *HI and derived parameters
table3.dat 133 179 Cross-matches of the HI detections
notes.dat 80 241 Notes to individual detections
sp/* . 170 Individual spectra
ps/* . 170 Individual spectra in ps format
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Note on table2.dat: We report on a 21cm HI survey of the northern hemisphere
Zone Of Avoidance (ZoA). We refer to this survey as EZOA.
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See also:
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/MNRAS/450/2025 : HIPASS-ZoA HII regions (Alves+, 2015)
J/MNRAS/457/2366 : Southern ZOA galaxies 21cm HI-line (Said+, 2016)
J/MNRAS/460/923 : WSRT ZoA Perseus-Pisces. HI catalogue (Ramatsoku+, 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- 14 A14 --- EZOA The EBHIS Zone of Avoidance (EZOA)
identifier (EZOA JHHMM-DDA)
18- 19 I2 h RAh Right ascension (J2000) (1)
21- 22 I2 min RAm Right ascension (J2000) (1)
24- 27 F4.1 s RAs Right ascension (J2000) (1)
31 A1 --- DE- Declination sign (J2000) (1)
32- 33 I2 deg DEd Declination (J2000) (1)
35- 36 I2 arcmin DEm Declination (J2000) (1)
38- 39 I2 arcsec DEs Declination (J2000) (1)
43- 48 F6.2 deg GLON Galactic longitude
51- 55 F5.2 deg GLAT Galactic latitude
58- 62 F5.2 mag E(B-V) The (B-V) color excess (2)
66- 70 I5 km/s HRV Heliocentric radial velocity
73- 74 I2 km/s e_HRV Uncertainty in HRV
78- 80 I3 km/s W50 Line width at 50% peak flux density
83- 84 I2 km/s e_W50 Uncertainty in W50
88- 90 I3 km/s W20 ? Line width at 20% peak flux density
93- 94 I2 km/s e_W20 ? Uncertainty in W20
97-101 F5.1 Jy.km/s FHI ? HI flux integral
104-107 F4.1 Jy.km/s e_FHI ? Uncertainty in FHI
111-114 F4.1 --- SNR ? Peak signal to noise ratio
118-122 I5 km/s vLG ? Galaxy velocity vLG (3)
125-130 F6.2 Mpc Dist ? Distance to the galaxy (based on vLG and
H0=75km/s/Mpc)
132-136 F5.2 [Msun] logMHI ? Log HI mass
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Note (1): Of the fitted position.
Note (2): As derived from the IRAS/DIRBE maps (Schlegel et al.,
1998ApJ...500..525S 1998ApJ...500..525S) and corrected with a factor of 0.86 as derived by
Schlafly et al. (2011ApJ...737..103S 2011ApJ...737..103S).
Note (3): Corrected to the Local Group frame of reference via:
vLG=HRV+300 sin(GLON)*cos(GLAT).
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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 A1 --- Type Counterpart type (a, b, or c) (1)
3- 16 A14 --- EZOA The EBHIS Zone of Avoidance (EZOA) identifier
(JHHMM-DDA format as in Table2)
19- 24 F6.2 deg GLON Galactic longitude of HI detection
27- 31 F5.2 deg GLAT Galactic latitude of HI detection
34- 39 F6.2 Mpc Dist Distance to the HI galaxy (based on vLG and
H0=75km/s/Mpc)
42- 46 F5.2 [Msun] logM ? Log HI mass
47 A1 --- n_logM [*]
49- 52 F4.1 mag AB The B band extinction (converted from
E(B-V) given in Table2 using RB=4.14)
53 A1 --- f_AB [*?] Flag on AB (2)
55- 57 A3 --- Cl [dpac-/ ] Classification of counterpart (3)
60 A1 --- I [I?] Counterpart in IRAS Point Source Catalog,
Cat. II/125
61 A1 --- M [M] Counterpart in 2MASX catalog, Cat. VII/233
62 A1 --- H [HJ] Counterpart in HIPASS (H) or HIJASS (J)
catalogs (5)
63 A1 --- S [S] Counterpart in HI Parkes ZOA shallow
survey (HIZSS; Henning et al.
2000AJ....119.2686H 2000AJ....119.2686H)
64 A1 --- Z [Z] Counterpart in HIZOA publications (6)
67 A1 --- o [o] Optical literature velocity flag (NED and
HyperLEDA) (7)
68 A1 --- h [h] HI literature velocity flag
71 A1 --- l [NS] Source of name (and coordinates, unless
flag 'c' is set) (8)
72 A1 --- c [c] Flag 'c' means coordinates measured on DSS
or NIR images (9)
75 A1 --- N [n] indicates a note in notes.dat file
78- 79 I2 h RACh ? Right ascension of counterpart (J2000)
81- 82 I2 min RACm ? Right ascension of counterpart (J2000)
84- 88 F5.2 s RACs ? Right ascension of counterpart (J2000)
89 A1 --- u_RACs Uncertainty flag on RACs
91 A1 --- DEC- Declination sign of counterpart (J2000)
92- 93 I2 deg DECd ? Declination of counterpart (J2000)
95- 96 I2 arcmin DECm ? Declination of counterpart (J2000)
98-101 F4.1 arcsec DECs ? Declination of counterpart (J2000)
102 A1 --- u_DECs Uncertainty flag on DECs
104-107 F4.1 arcmin Sep ? Distance between the HI fitted position
and the counterpart position
111-133 A23 --- OName Other literature identifier (in this order of
preference: NGC, IC, UGC, ESO, CGMW,
WEIN, 2MASS, others)
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Note (1): Note that for "b" and "c" there are two rows per HI detection where
in each second row the first six columns are repeated to make the table
easier to read by a computer.
a = HI detections with single cross-matches or no counterpart
b = HI detections with more than one cross-match. In this case, more than
one galaxy is assumed to contribute to the HI profile (note that where
the confusing partner was another of our HI detections we do not
list them separately)
c = HI detections with ambiguous cross-matches. More than one candidate
was found but, judged by the profile, only ONE OF THEM is the likely
counterpart
Note (2): Flag on AB as follows:
* = denotes an extinction value deemed to be uncertain during the search
(e.g., due to high spatial variability)
? = indicates the possibility that the extinction value might be erroneous
Note (3): Classification of counterpart as follows:
d = definite
p = probable
a = ambiguous
c = confused candidate
- = no candidate
Note (5): Flag for counterpart in HIPASS defined as below:
H = HIPASS catalogs (South, Meyer et al. 2004 (cat. VIII/73),
North, Wong et al. 2006 (cat. VIII/89))
J = HIJASS catalog (Lang et al., 2003, Cat. J/MNRAS/342/738)
Note (6): HIZOA catalogs are: Juraszek et al., 2000AJ....119.1627J 2000AJ....119.1627J,
Donley et al., 2005 (Cat. J/AJ/129/220),
Staveley-Smith et al., 2016 (Cat J/AJ/151/52)
Note (7): NED=http://ned.ipac.caltech.edu/, and
HyperLEDA=http://leda.univ-lyon1.fr/.
Note (8): Source of name as follows:
N = listed in NED, http://ned.ipac.caltech.edu/, and
S = listed in SIMBAD, http://simbad.u-strasbg.fr/simbad/.
Note (9): For the visual search to find counterparts for the HI detections, we
downloaded images from the SuperCOSMOS Sky Surveys
(http://www-wfau.roe.ac.uk/sss/) (B band), the Digitized Sky Surveys (DSS;
http://www3.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/dss/) (R and I band), 2MASS
http://irsa.ipac.caltech.edu/applications/2MASS/) (Ks band), as well as
UKIDSS (http://surveys.roe.ac.uk/wsa/) and VISTA wherever possible (mainly
Ks-band, but if not available, we used the band closest in wavelength).
Note that some published coordinates were not centered properly so we
give the measured ones.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- EZOA The EBHIS HI Zone of Avoidance (EZOA) identifier
(EZOA JHHMM-DDA)
16- 80 A65 --- Note Notes to individual detection
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Byte-by-byte Description of file (#): sp/*
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Bytes Format Units Label Explanations
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2- 12 E11.6 --- Chan Channel
18- 33 E16.10 km/s HRV Radial heliocentric velocity
37- 48 E12.6 Jy.km/s S Flux density
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Acknowledgements:
Anja Schroeder, anja(at)hartrao.ac.za
History:
05-Nov-2019: on-line version
12-Nov-2019: Names of table3.dat corrected
(End) Patricia Vannier [CDS] 04-Nov-2019