J/MNRAS/481/1262 2MASS bright galaxies HI ZoA survey (Kraan-Korteweg+, 2018)
The Nancay H I Zone of Avoidance survey of 2MASS bright galaxies.
Kraan-Korteweg R.C., van Driel W., Schroder A.C., Ramatsoku M., Henning P.A.
<Mon. Not. R. Astron. Soc. 481, 1262-1280 (2018)>
=2018MNRAS.481.1262K 2018MNRAS.481.1262K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Radio sources ; Radial velocities ; Spectra, radio
Keywords: galaxies: distances and redshifts - galaxies: general -
galaxies: ISM - radio lines: galaxies
Abstract:
To complement the 2MASS Redshift Survey (2MRS) and the 2MASS
Tully-Fisher survey (2MTF) a search for 21cm HI line emission of 2MASS
bright galaxy candidates has been pursued along the dust-obscured
plane of the Milky Way with the 100m Nancay Radio Telescope. For our
sample selection we adopted an isophotal extinction-corrected K-band
magnitude limit of Kso=11.25mag, corresponding to the first 2MRS
data release and 2MTF, for which the 2MASX completeness level remains
fairly constant deep into the Zone of Avoidance (ZoA). About one
thousand galaxies without prior redshift measurement accessible from
Nancay (Dec>-40deg) were observed to an rms noise level of ∼3mJy
for the velocity range -250 to 10600km/s. This resulted in 220 clear
and 12 marginal detections of the target sample. Only few detections
have redshifts above 8000km/s due to recurring radio frequency
interference (RFI).
A further 29 detections and 6 marginals have their origin in
non-target galaxies in the telescope beam. The newly detected galaxies
are on average considerably more HI-rich (mostly 109-1010M☉)
compared to systematic (blind) HI surveys. The HI detections reveal
various new filaments crossing the mostly uncharted northern ZoA
(e.g., at GLON ∼90deg, 130deg, 160deg), whilst consolidating galaxy
agglomerations in Monoceros and Puppis (GLON ∼220deg, 240deg).
Considerably new insight has been gained about the extent of the
Perseus-Pisces Supercluster through the confirmation of a ridge
(GLON∼16deg) encompassing the 3C129 cluster that links Perseus-Pisces
to Lynx, and the continuation of the second Perseus-Pisces arm
(GLON∼90deg) across the ZoA.
A Hubble constant of H0=75km/s/Mpc has been used.
Description:
Our NRT target list contained 1003 2MASS galaxies brighter than
Ks0<11.25mag across the ZoA (|b|<10°) accessible from Nancay
(Dec.>-40°). The majority of the galaxies without prior redshift
measurement are located within the inner ZoA (|b| < 5°). They were
selected from the newly defined 2MZOAG catalogue (Schroder, van Driel
& Kraan-Korteweg, 2019MNRAS.482.5167S 2019MNRAS.482.5167S).
For the adopted sensitivity limit of rms=3mJy and the redshift limit
of 10600km/s, the 1800h observing time allocated with the NRT led to
the detection of 230 galaxies (of which 10 are marginal). An
additional 29 and 6 clear and marginal detections of non-target are
presented.
The detection rate of the bright 2MZOAG sample was found to be
independent of foreground extinction (Fig. 3), in agreement with what
was found in the 'blind' HIZoA survey (Staveley-Smith et al.,
2016AJ....151...52S 2016AJ....151...52S, Cat. J/AJ/151/52). The 22 per cent detection rate
is consistent with our pilot project (van Driel et al.,
2009A&A...505...29V 2009A&A...505...29V, Cat. J/A+A/505/29), and quite reasonable
considering that no pre-selection on morphological type was made.
Moreover, many of the brighter galaxies might have been targeted on
earlier occasions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1a.dat 118 220 HI detections -- observational data:
clear HI detections of 2MZOAG galaxies
tablea1b.dat 118 10 HI detections -- observational data:
marginal HI detections of 2MZOAG galaxies
tablea1c.dat 118 6 HI detections -- observational data:
clear HI detections of other galaxies
tablea1d.dat 118 3 HI detections -- observational data:
marginal HI detections of other galaxies
tablea2a.dat 91 30 HI detections of non-targets in the telescope
beam: clear HI detections
tablea2b.dat 91 6 HI detections of non-targets in the telescope
beam: marginal HI detections
tablea3a.dat 78 74 Comparison with literature HI detections:
clear HI detections
tablea3b.dat 78 4 Comparison with literature HI detections:
HI non-detections
tablea4.dat 40 170 Optical velocities in the literature
tablea5.dat 93 773 HI non-detections -- observational data
tablea6.dat 118 12 Possible HI detections -- observational data
tablea7a.dat 110 220 HI detections -- derived properties:
clear HI detections of 2MZOAG galaxies
tablea7b.dat 110 10 HI detections -- derived properties:
marginal HI detections of 2MZOAG galaxies
tablea7c.dat 110 6 HI detections -- derived properties:
clear HI detections of other galaxies
tablea7d.dat 110 3 HI detections -- derived properties:
marginal HI detections of other galaxies
notes.dat 103 1039 Individual notes
sp/* . 269 Individual spectra
fig/* . 269 Spectra in ps format
--------------------------------------------------------------------------------
See also:
J/A+A/505/29 : HI observations of 2MASS galaxies in ZoA (van Driel+, 2009)
J/MNRAS/482/5167 : The 2M-ZoA galaxy catalogue (Schroeder+, 2019)
Byte-by-byte Description of file: tablea1?.dat tablea6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASX 2MASX J catalogue identifier for the J2000.0
coordinates (HHMMSSss+DDMMSSs)
17 A1 --- f_2MASX [)] ) for galaxy is not listed in the 2MASX
catalogue
18 A1 --- n_2MASX [a] indicates a note in note.dat file
20- 24 A5 --- Flag Flags (G1)
26- 46 A21 --- OName Other name
48- 52 F5.2 mag Kmag ?=- The K-band magnitude measured within
the r_(K20) isophotal aperture
54- 57 F4.2 mag J-K ?=- The (J-K) colour measured within
the r_(K20) isophotal aperture;
59- 62 F4.2 mag H-K ?=- The (H-K) colour measured within
the r_(K20) isophotal aperture;
64- 66 I3 arcsec DiamK ?=- The elliptical aperture major diameter at
the 20mag/sq." K-band isophote;
68- 71 F4.2 --- b/a ?=- The minor-to-major axial ratio, fit to the
3-sigma super-co-added isophote;
73- 77 I5 km/s HRV50 The heliocentric HI radial velocity determined
as the centre of HI profile measured at
the 50% peak flux density
79 A1 --- u_HRV50 Uncertain value flag (G2)
81- 82 I2 km/s e_HRV50 Estimated uncertainty in HRV50 (G3)
84- 86 I3 km/s W50 The HI line width measured at 50% of the
HI profile peak level (G3)
88 A1 --- u_W50 Uncertain value flag (G2)
90- 92 I3 km/s W20 The HI line width measured at 20% of the
HI profile peak level (G3)
94 A1 --- u_W20 Uncertain value flag (G2)
96-100 F5.2 Jy.km/s FHI The total measured HI line flux
102 A1 --- u_FHI Uncertain value flag (G2)
104-107 F4.2 Jy.km/s e_FHI Estimated uncertainty in FHI (G3)
109-112 F4.2 mJy rms The rms noise level value of the HI
spectrum (G4)
114-118 F5.1 --- SNR The signal-to-noise ratio determined by
taking the line width into account (G3)
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Byte-by-byte Description of file: tablea2a.dat tablea2b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASX 2MASX name of the targeted galaxy (5)
17 A1 --- f_2MASX [)] ) for galaxy is not listed in the 2MASX
catalogue, J2000-coordinates
(HHMMSSs+DDMMSS)
18 A1 --- n_2MASX [a] indicates a note in note.dat file
20- 24 A5 --- Flag Flags (G1)
26- 48 A23 --- ID Name of the galaxy from which the HI-signal
in the beam of the target originates
(where identified)
50- 52 F3.1 --- Sep ? Distance between the pointing position and
the actually detected, non-target galaxy
in the beam (in 0.5*HPBW unit)
54- 58 I5 km/s HRV50 ? The heliocentric HI radial velocity
determined as the centre of HI profile
measured at the 50% peak flux density
60- 61 I2 km/s e_HRV50 ? Estimated uncertainty in HRV50 (G3)
63- 65 I3 km/s W50 ? The HI line width measured at 50% of
the HI profile peak level (G3)
67- 69 I3 km/s W20 ? The HI line width measured at 20% of
the HI profile peak level (G3)
71- 75 F5.2 Jy.km/s FHI ? The total measured HI line flux
77- 80 F4.2 Jy.km/s e_FHI ? Estimated uncertainty in FHI (G3)
82- 85 F4.2 mJy rms ? The rms noise level value of
the HI spectrum (G4)
87- 91 F5.1 --- SNR ? The signal-to-noise ratio determined by
taking the line width into account (G3)
--------------------------------------------------------------------------------
Note (5): Although an HI signal was identified, it has its origin in
another galaxy than the targeted one. Where known, the name of the source
of the signal is given in Column ID.
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Byte-by-byte Description of file: tablea3a.dat tablea3b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASX 2MASX J catalogue identifier for the J2000.0
coordinates (HHMMSSss+DDMMSSs)
17 A1 --- f_2MASX [)] ) for galaxy is not listed in the 2MASX
catalogue, J2000-coordinates (HHMMSSs+DDMMSS)
18 A1 --- n_2MASX [a] indicates a note in note.dat file
20- 22 A3 --- Flag Flags (G1)
24- 28 I5 km/s HRV50 ? The heliocentric HI radial velocity
determined as the centre of HI profile
measured at the 50% peak flux density
30 A1 --- u_HRV50 Uncertain value flag (G2)
32- 34 I3 km/s W50 ? The HI line width measured at 50% of
the HI profile peak level (G3)
36 A1 --- u_W50 Uncertain value flag (G2)
38- 40 I3 km/s W20 ? The HI line width measured at 20% of
the HI profile peak level (G3)
42 A1 --- u_W20 Uncertain value flag (G2)
44- 48 F5.2 Jy.km/s FHI ? The total measured HI line flux
50 A1 --- u_FHI Uncertain value flag (G2)
52- 55 I4 km/s HRV50lit ?=- The heliocentric HI radial velocity
reported in the literature
57- 59 I3 km/s W50lit ?=- The HI line width measured at 50% of the
HI profile peak level reported in the
literature
61- 63 I3 km/s W20lit ?=- The HI line width measured at 20% of the
HI profile peak level reported in the
literature
65- 70 F6.2 Jy.km/s FHIlit ?=- The total measured HI line flux reported
in the literature
72- 74 A3 --- Tel Telescope code (6)
76- 78 A3 --- Ref Reference code (7)
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Note (6): Telescope code as follows:
91m = NRAO 91m;
ARE = Arecibo 305m
EFF = Effelsberg 100m
GBT = Green Bank Telescope 100m
JBO = Jodrell Bank 76m
NRT = Nancay Radio telescope 94m equiv.
PKS = Parkes 64m
VLA = Very Large Array 27*25m
Note (7): Reference code of the paper which published the literature values
as follows:
C99 = Chamaraux et al., 1999MNRAS.307..236C 1999MNRAS.307..236C, Cat. J/MNRAS/307/236
C09 = Courtois et al., 2009AJ....138.1938C 2009AJ....138.1938C, Cat. J/AJ/138/1938
D05 = Doyle et al., 2005MNRAS.361...34D 2005MNRAS.361...34D, Cat, J/MNRAS/361/34
H87 = Hauschildt, 1987A&A...184...43H 1987A&A...184...43H
H88 = Haynes et al., 1988AJ.....95..607H 1988AJ.....95..607H
H92 = Henning, 1992ApJS...78..365H 1992ApJS...78..365H
H00 = Henning et al., 2000AJ....119.2686H 2000AJ....119.2686H
H10 = Henning et al., 2010AJ....139.2130H 2010AJ....139.2130H, Cat. J/AJ/139/2130
H86 = Huchtmeier & Richter, 1986A&AS...63..323H 1986A&AS...63..323H,
K87 = Kerr & Henning, 1987ApJ...320L..99K 1987ApJ...320L..99K
K92 = Kraan-Korteweg & Huchtmeier, 1992A&A...266..150K 1992A&A...266..150K,
K04 = Koribalski et al., 2004AJ....128...16K 2004AJ....128...16K, Cat. J/AJ/128/16
L90 = Lu et al., 1990ApJ...357..388L 1990ApJ...357..388L
L03 = Lang et al., 2003MNRAS.342..738L 2003MNRAS.342..738L, Cat. J/MNRAS/342/738
M90 = Martin et al., 1990A&A...235...41M 1990A&A...235...41M
M04 = Meyer et al., 2004MNRAS.350.1195M 2004MNRAS.350.1195M, Cat. VIII/73
M14 = Masters et al., 2014MNRAS.443.1044M 2014MNRAS.443.1044M, Cat. J/MNRAS/443/1044
P97 = Pantoja et al., 1997AJ....113..905P 1997AJ....113..905P, Cat. J/AJ/113/905
P03 = Paturel et al., 2003A&A...412...57P 2003A&A...412...57P, Cat. VII/238
R00 = Rosenberg et al., 2000ApJS..130..177R 2000ApJS..130..177R, Cat. J/ApJS/130/177
R02 = Ryan-Weber et al., 2002AJ....124.1954R 2002AJ....124.1954R, Cat. J/AJ/124/1954
S94 = Seeberger et al., 1994A&A...286...17S 1994A&A...286...17S, Cat. J/A+A/286/17
S05 = Springob et al., 2005ApJS..160..149S 2005ApJS..160..149S, Cat. VIII/77
S16 = Staveley-Smith et al., 2016AJ....151...52S 2016AJ....151...52S, Cat J/AJ/151/52
W06 = Wong et al., 2006MNRAS.371.1855W 2006MNRAS.371.1855W, Cat. VIII/89
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Byte-by-byte Description of file: tablea4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASX 2MASX J catalogue identifier for the
J2000.0 coordinates (HHMMSSss+DDMMSSs)
18 A1 --- n_2MASX [a] indicates a note in note.dat file
20- 23 A4 --- Flag Flags (G1)
24 A1 --- Deltav [*] A star indicates whether the optical
velocity differs from the HRV50 NRT-values
by more than 3 times the uncertainty in the
optical velocity or by more than 150km/s
where no uncertainty was published
26- 30 I5 km/s RVopt The heliocentric radial velocity measured
in the optical
32 A1 --- u_RVopt Uncertain value flag (G2)
34- 36 I3 km/s e_RVopt ? Estimated uncertainty in RVopt
38- 40 A3 --- Ref Reference code (8)
--------------------------------------------------------------------------------
Note (8): Reference code for the optical velocity as follows:
B09 = Beckmann et al., 2009A&A...505..417B 2009A&A...505..417B, Cat. J/A+A/505/417
C08 = Crook et al., 2007ApJ...655..790C 2007ApJ...655..790C, Cat. J/ApJ/655/790
with erratum in 2008ApJ...685.1320C 2008ApJ...685.1320C
D90 = Djorgovski et al. 1990AJ....100..599D 1990AJ....100..599D
D91 = Dressler, 1991ApJS...75..241D 1991ApJS...75..241D, Cat. J/ApJS/75/241
F95 = Fisher et al., 1995ApJS..100...69F 1995ApJS..100...69F, Cat. VII/185
G08 = Goncalves et al;, 2008ATel.1623....1G 2008ATel.1623....1G
H12 = Huchra et al., 2012ApJS..199...26H 2012ApJS..199...26H, Cat. J/ApJS/199/26
H91 = Hewitt & Burbidge, 1991ApJS...75..297H 1991ApJS...75..297H, Cat. VII/178
H95 = Huchra et al., 1995ApJS...99..391H 1995ApJS...99..391H, Cat. VII/193
J09 = Jones et al., 2009MNRAS.399..683J 2009MNRAS.399..683J, Cat. VII/259
K11 = Kobayashi et al., 2011ApJ...739...57K 2011ApJ...739...57K
L99 = Lawrence et al., 1999MNRAS.308..897L 1999MNRAS.308..897L, Cat. J/MNRAS/308/897
M96 = Marzke et al., 1996AJ....112.1803M 1996AJ....112.1803M, Cat. J/AJ/113/1803
M98 = Motch et al., 1998A&AS..132..341M 1998A&AS..132..341M, Cat. J/A+AS/132/341
N97 = Nakanishi et al., 1997ApJS..112..245N 1997ApJS..112..245N, Cat. J/ApJS/112/245
P09 = Parisi et al., 2009A&A...507.1345P 2009A&A...507.1345P
R11 = Ricci et al., 2011A&A...532A.102R 2011A&A...532A.102R
S85 = Spinrad et al,, 1985PASP...97..932S 1985PASP...97..932S, Cat. J/PASP/97/932
S92 = Strauss et al., 1992ApJS...83...29S 1992ApJS...83...29S, Cat. II/174
S98 = Seeberger & Saurer, 1998A&AS..127..101S 1998A&AS..127..101S, Cat. J/A+AS/127/101
S00 = Saunders et al., 2000MNRAS.317...55S 2000MNRAS.317...55S, Cat. VII/221
T94 = Takata et al., 1994A&AS..104..529T 1994A&AS..104..529T, Cat. J/A+AS/104/529
V96 = Visvanathan & Yamada, 1996ApJS..107..521V 1996ApJS..107..521V, Cat. J/ApJS/107/521
Y93 = Yamada et al., 1993ApJS...89...57Y 1993ApJS...89...57Y, Cat. J/ApJS/89/57
Y94 = Yamada et al., 1994MNRAS.270...93Y 1994MNRAS.270...93Y
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Byte-by-byte Description of file: tablea5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASX 2MASX J catalogue identifier for the
J2000.0 coordinates (HHMMSSsDDMMSSs)
18 A1 --- n_2MASX [a] indicates a note in note.dat file
20- 23 A4 --- Flag Flags (G1)
24- 45 A22 --- OName Other name
47- 52 F6.2 deg GLON [0/360] Galactic longitude
54- 59 F6.2 deg GLAT Galactic latitude
61- 65 F5.2 mag Kmag The K-band magnitude measured within the
r_(K20) isophotal aperture
67- 70 F4.2 mag AK Galactic foreground extinction in the
K-band (G9)
72- 76 F5.2 mag Kmagc Extinction-corrected isophotal K-band
magnitude (G10)
78- 82 F5.2 mag (J-K)c ?=- Extinction-corrected (J-K) colour
measured within the r_(K20) isophotal
aperture (G10)
84- 88 F5.2 mag (H-K)c ?=- Extinction-corrected (H-K) colour
measured within the r_(K20) isophotal
aperture (G10)
90- 93 F4.2 mJy rms The rms noise level values of the HI
spectrum (G4)
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Byte-by-byte Description of file: tablea7?.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASX 2MASX J catalogue identifier for the
J2000.0 coordinates
(HHMMSSss+DDMMSSs)
17 A1 --- f_2MASX [)] ) for galaxy is not listed in the
2MASX catalogue, J2000-coordinates
(HHMMSSs+DDMMSS)
18 A1 --- n_2MASX [a] indicates a note in note.dat file
20- 24 A5 --- Flag Flags (G1)
26- 31 F6.2 deg GLON Galactic longitude
33- 38 F6.2 deg GLAT Galactic latitude
40- 43 F4.2 mag AK Galactic foreground extinction in the
K-band (G9)
45- 49 F5.1 Mpc Dist Distance with respect to the Local
Group (=VLG/H0)
51- 55 F5.2 mag Kmagc ?=- Extinction-corrected isophotal
K-band magnitude (G10)
57- 61 F5.2 mag (J-K)c ?=- Extinction-corrected (J-K) colour
measured within the r_(K20)
isophotal aperture (G10)
63- 67 F5.2 mag (H-K)c ?=- Extinction-corrected (H-K) colour
measured within the r_(K20)
isophotal aperture (G10)
69- 73 F5.1 kpc Radc ?=- Radius determined at the
extinction-corrected surface
brightness level of 20mag/arcsec2
in the K-band (see also (G10))
75- 79 F5.2 [Lsun] log(LKc) ?=- Extinction-corrected K-band
luminosity within Radc (11)
81- 85 F5.2 [Msun] log(MHI) Total HI mass
(=2.356*105*Dist2*FHI)
87- 91 F5.2 [Msun/Lsun] log(M/L) ?=- Ratio of the total HI mass to the
extinction-corrected K luminosity
93- 96 I4 km/s vrot ?=- Rotation speed corrected for
inclination i, Note (12)
98 A1 --- u_vrot Uncertain value flag (G2)
100-104 F5.2 [Msun] log(Mdyn) ?=- Dynamical mass (13)
106-110 F5.2 --- log(Mbar/Mdyn) ?=- Ratio of the combined HI and
stellar baryonic mass as a fraction
of the total dynamical mass (14)
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Note (11): Assuming a solar absolute magnitude of 3.31mag
(Colina & Bohlin, 1997AJ....113.1138C 1997AJ....113.1138C)
Note (12): vrot = W50/2*sin(i) for sin(i)<0.2; else vrot=W50/2
Note (13): Mdyn = vrot2*Radc/G
Note (14): Mbar = 0.8*LKc+1.4*MHI (McGaugh et al., 2000ApJ...533L..99M 2000ApJ...533L..99M)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 24 A24 --- Name 2MASX or Anon name
25-103 A79 --- Note Notes to individual detection (1)
--------------------------------------------------------------------------------
Note (1): We discuss special cases that merit further description, especially
where detections showed a confused profile or identifications may be wrong.
Please note that when examining other sources inside a radio telescope beam
that could possibly contaminate the HI profile obtained while pointing towards
the intended target source, we express their separation in terms of the
telescope's beam radius, rather than in arcminutes: the beam radius unit, b,
is the distance from the pointing centre at which the telescope gain has
dropped to a level of 50% of its peak level (i.e., 0.5 HPBW).
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Byte-by-byte Description of file (#): sp/*
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 9 F8.2 km/s RV Radial velocity
13- 19 F7.2 mJy Flux Nancay 21cm HI line flux density
--------------------------------------------------------------------------------
Global notes:
Note (G1): Flag as follows:
c = HI spectrum confused by one or more additional galaxies in
the telescope beam
c? = HI spectrum possibly confused by one or more additional galaxies in
the telescope beam
d = Derippled spectrum, that is, from which the effects of the baseline
ripple were removed
e = The target forms part of the higher extinction sample, i.e. |b|>10deg
(cf. Schroeder et al., 2019MNRAS.482.5167S 2019MNRAS.482.5167S, Cat. J/MNRAS/482/5167)
and was observed for completeness; they are not used in the ZoA
data analysis
n = The coordinates mark the target position, not of the source of the
observed emission, which is offset from the pointing position
r = The optical velocity lies within the velocity range affected by radar
RFI (8500-10000km/s)
s = The target is not in the original, magnitude limited, sample but was
observed to check on the detection of another target (in case the
galaxy is not listed in the 2MASX catalogue, their coordinates are
given in brackets)
v = Galaxy that has a published optical velocity inside the NRT search
range
v+ = Galaxy with an optical velocity that lies outside the NRT search range
Note (G2): A colon denotes an uncertain measurement.
Note (G3): uncertainties were determined following the formalism in
Schneider et al., 1986AJ.....92..742S 1986AJ.....92..742S and 1990ApJS...72..245S 1990ApJS...72..245S:
e_HRV50 = 1.5 * (W20-W50) / SNR
e_w50 = 2*e_HRV50
e_w20 = 3.1*e_HRV50
e_FHI = 2*(1.2*W20*Res)0.5*rms
The SNR was determined following the ALFALFA HI survey formulation from
Saintonge et al., 2007AJ....133.2087S 2007AJ....133.2087S:
SNR = 1000(FHI/W50)*(W50/2*Res)0.5)
Res is the instrumental resolution (see Sec. 3)
Note (G4): The rms noise level was determined over a 3000km/s wide part of
the spectrum with low RFI occurrence; it is representative of the full
velocity range.
Note (G9): Estimated from the Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S)
DIRBE/IRAS extinction values E(B-V) at the position of the source. We
applied a correction factor of f=0.86 (Schlafly & Finkbeiner,
2011ApJ...737..103S 2011ApJ...737..103S). Following Fitzpatrick (1999PASP..111...63F 1999PASP..111...63F), a
conversion factor of RK=0.373 was applied to arrive at the A_K-value.
Note (G10): Magnitudes are corrected for (a) the global foreground
extinction at the position of the galaxy, AK, and (b) for the loss of the
low surface-brightness (SB) features that have fallen below the 20th
isophote because of the reduction in SB at each pixel of the galaxy's
extent (Riad et al. 2010MNRAS.401..924R 2010MNRAS.401..924R).
--------------------------------------------------------------------------------
Acknowledgements:
Anja Schroeder, anja(at)mpe.mpg.de
(End) Patricia Vannier [CDS] 22-May-2024