J/A+A/366/428 HI observations of nearby dwarf galaxies (Karachentsev+, 2001)
HI observations of nearby galaxies.
III. More dwarf galaxies in the northern sky.
Karachentsev I.D., Karachentseva V.E., Huchtmeier W.K.
<Astron. Astrophys. 366, 428 (2001)>
=2001A&A...366..428K 2001A&A...366..428K
ADC_Keywords: Galaxies, nearby ; H I data ; Radial velocities
Keywords: galaxies: distances and redshifts - galaxies: dwarf -
galaxies: fundamental parameters - galaxies: general -
galaxies: irregular - infrared: galaxies
Abstract:
We carried out a systematic search for nearby dwarf galaxies in the
northern sky based on POSS-II film copies. As a result we present a
list of 101 nearby dwarf galaxy candidates mainly of low surface
brightness which have angular diameters a>0.5'. About two thirds of
the objects are new discoveries. This sample is considered as a
supplement to the 163 northern dwarf galaxy candidates
(1998, Cat., J/A+AS/127/409) which have been detected in the same
declination range around the known Local Volume galaxies and to the 78
dwarf galaxy candidates (1999A&AS..135..221K 1999A&AS..135..221K) in the Local Void
region. All the galaxies were observed in HI with the 100-m Effelsberg
radio telescope with a detection rate of 46%. The sample of detected
galaxies has the following median parameters: radial velocity
VLG=+770km/s, HI line width W50=46km/s, absolute blue magnitude
MB=-13.8mag, linear diameter A0=2.7kpc, hydrogen
mass-to-luminosity ratio MHI/LB=1.2M☉/L☉, and the HI
mass-to-total mass ratio MHI/Mt=0.28.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 115 101 Optical data for the new northern nearby dwarf
galaxies candidates found on the POSS-II.
table2.dat 84 101 HI line data for nearby dwarf galaxies
tables.tex 91 570 LaTeX version of the tables
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See also:
J/A+AS/127/409 : New nearby dwarf galaxy candidates list (Karachentseva+ 1998)
J/A+AS/139/97 : HI properties of nearby galaxies (Karachentsev+, 1999)
J/A+AS/141/469 : First list of the Karachentsev catalog (Huchtmeier+, 2000)
J/A+AS/147/187 : Second list of the Karachentsev catalog (Huchtmeier+, 2000)
J/A+A/377/801 : Fourth list of the Karachentsev catalog (Huchtmeier+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- KKH Running number
5- 6 I2 h RAh Right ascension (1950.0)
8- 9 I2 min RAm Right ascension (1950.0)
11- 14 F4.1 s RAs Right ascension (1950.0)
16 A1 --- DE- Declination sign (1950.0)
17- 18 I2 deg DEd Declination (1950.0)
20- 21 I2 arcmin DEm Declination (1950.0)
23- 24 I2 arcsec DEs Declination (1950.0)
26- 29 F4.2 arcmin ablue Blue plate major angular diameter (1)
30 A1 --- u_ablue Uncertainty flag on ablue
32- 35 F4.2 arcmin bblue Blue plate minor angular diameter (1)
36 A1 --- u_bblue Uncertainty flag on bblue
38- 41 F4.2 arcmin ared ? Red plate major angular diameter (1)
42 A1 --- u_ared Uncertainty flag on ared
44- 47 F4.2 arcmin bred ? Red plate minor angular diameter (1)
48 A1 --- u_bred Uncertainty flag on bred
50- 53 A4 --- MType Morphological type in the usual designations (2)
55- 56 A2 --- SB Mean surface brightness indicator (3)
58- 73 A16 --- Names Other names as given in the NED
(NASA Extragalactic Database)
75- 78 F4.1 mag Bmag ? Apparent blue magnitude of the galaxy (4)
80- 83 F4.2 mag AB Galactic extinction AB from
Schlegel et al. (1998)
85-114 A30 --- Notes Comments concerning structure, color, and
heliocentric radial velocity
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Note (1): Diameters to the limiting isophote ~(26.5-27.0)mag/arcmin2
with an accuracy of ∼15%
Note (2): Morphological type:
Sph = spheroidal
Ir = irregular
Sm = irregular with signs of spiral structure
Note (3): Mean surface brightness:
H = high (22 - 23 mag/arcsec2)
L = low (∼24 mag/arcsec2)
VL = very low (∼25 mag/arcsec2)
EL = extremely low (∼26 mag/arcsec2)
Note (4): Apparent blue magnitude of the galaxy estimated visually with an
accuracy of 0.5 mag based on comparison with other LSB galaxies
having photometrically measured total magnitudes
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- KKH Running number
5- 6 A2 --- l_SHI [≥ ] Limit flag on SHI
7- 12 F6.2 Jy.km/s SHI ? HI flux
13- 16 I4 mJy Smax ? Maximum flux density emission
18- 21 F4.1 mJy e_Smax ? rms noise
23- 26 I4 km/s HRV ? Mean heliocentric radial velocity
28 I1 km/s e_HRV ? rms uncertainty on HRV
30- 32 I3 km/s LW50 ? Line width at the 50% level of peak emission
34- 36 I3 km/s LW25 ? Line width at the 25% level of peak emission
38- 40 I3 km/s LW20 ? Line width at the 20% level of peak emission
41 A1 --- u_LW20 Uncertainty flag on LW20
43- 46 I4 km/s RV ? Radial velocity with respect to the
Local Group centroid (1)
48- 52 F5.1 mag BMAG ? Integral absolute magnitude (2)
54- 56 F3.1 Sun MHI/LB ? Integrated HI mass-to-luminosity ratio (3)
57 A1 --- u_MHI/LB Uncertainty flag on MHI/LB
59- 62 F4.1 Sun M/LB ? Galaxy total mass-to-luminosity ratio (4)
64- 84 A21 ---- Comm Comments concerning galaxy membership in
groups or cases of confusion with galactic
hydrogen emission
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Note (1): Radial velocity with respect to the Local Group centroid
with the solar apex parameters: VA=316km/s, lA=93°,
bA=-4°, Karachentsev and Makarov (1996AJ....111..794K 1996AJ....111..794K), Schlegel
et al. (1998ApJ...500..525S 1998ApJ...500..525S) assuming a kinematic distance D=VLG/H
with a Hubble constant of 75 km/s/Mpc.
Note (2): Integral absolute magnitude corrected for galactic extinction
AB (Schlegel et al. 1998ApJ...500..525S 1998ApJ...500..525S) assuming a kinematic
distance D=VLG/H with a Hubble constant of 75km/s/Mpc
Note (3): (MHI/Msun)=2.35*105*D2*SHI
Note (4): Where the indicative total mass M=0.83*104*a*W502*D is
expressed via the measured angular diameter in arcmin and the HI line
width W50 at 50% of the peak intensity, in km/s; here we did not
introduce a correction for the galaxy inclination because of its
uncertainty for irregular galaxies, and the calculated value is a
minimum for the total galaxy mass inside the isophote of ∼27mag/arcsec2
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Acknowledgements: Walter Huchtmeier
(End) Patricia Bauer [CDS] 25-Jan-2001