J/ApJ/655/814 HII regions in IC 342/Maffei group (Fingerhut+, 2007)
The extinction and distance of Maffei 2 and a new view of the
IC 342/Maffei group.
Fingerhut R.L., Lee H., Mccall M.L., Richer M.G.
<Astrophys. J., 655, 814-830 (2007)>
=2007ApJ...655..814F 2007ApJ...655..814F
ADC_Keywords: Clusters, galaxy ; H II regions ; Spectroscopy ; Radial velocities
Keywords: galaxies: clusters: individual (IC 342-Maffei) -
galaxies: distances and redshifts -
galaxies: individual (Maffei 1, Maffei 2, IC 342)
Abstract:
We have obtained spectra of HII regions in the heavily obscured
spiral galaxy Maffei 2. The observations have allowed for a
determination of the Galactic extinction of this galaxy using a
correlation between extinction and hydrogen column density observed
among spiral galaxies.
Description:
Long-slit spectroscopic observations of two HII regions in Maffei 2
were obtained on 1997 March 2 and 3 UT with the Ritchey-Chretien
spectrograph on the Mayall 4m telescope at Kitt Peak National
Observatory (KPNO). Observations were optimized to detect both Hα
and Hβ emission to determine the extinction toward Maffei 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 124 8 Properties of HII regions in Maffei 2 and IC 342
table4.dat 124 73 Properties of HII regions sample
table3.dat 75 12 Properties of the spiral galaxies hosting
HII regions
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See also:
J/A+AS/124/559 : VI photometry of dwarf galaxies (Karanchentsev+ 1997)
Byte-by-byte Description of file: table[24].dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Gal Galaxy name
10- 19 A10 --- [FLM2007] HII region name (+xxxx+yyyy) (1)
21- 24 I4 arcsec r Deprojected galactocentric radius (2)
26- 30 F5.1 0.1nm EWHb ?=- Hβ equivalent width
32- 36 F5.2 --- Ha/Hb Observed Hα-to-Hβ flux ratio (3)
38- 41 F4.2 --- e_Ha/Hb ? rms uncertainty on Ha/Hb
43- 47 F5.2 [-] [O/H] Oxygen abundance log(O/H) derived from the
forbidden oxygen lines
48 A1 --- n_[O/H] [a] No O line data (4)
50- 54 I5 K T Equilibrium temperature derived from [O/H]
56- 59 F4.2 --- Ha/Hb0 Intrinsic Balmer flux ratio (5)
61- 65 F5.2 --- tau Total optical depth at 1um derived from
the observed and intrinsic Balmer decrements
67- 70 F4.2 --- e_tau ? rms uncertainty on tau
72- 76 F5.2 10+20cm-2 NHI Annular averaged column density of
neutral hydrogen within the annulus at r
78- 81 F4.2 10+20cm-2 e_NHI ? rms uncertainty on HI
83- 86 F4.2 10+20cm-2/km/s X Conversion factor for CO intensity to H2
column density (X=N(H2)/I(CO))
(in 1020cm-2/(km/s))
88- 92 F5.2 10+20cm-2 NH2 Annular averaged column density of
molecular hydrogen within the annulus at r
94- 97 F4.2 10+20cm-2 e_NH2 ? rms uncertainty on NH2
99-103 F5.2 10+20cm-2 nH Half of the column density of hydrogen
in both atomic and molecular form at r
105-108 F4.2 10+20cm-2 e_nH ? rms uncertainty on nH
110-114 F5.2 --- tauloc Extragalactic optical depth at 1um (6)
116-119 F4.2 --- e_tauloc ? rms uncertainty on tauloc
121-124 A4 --- Ref References (7)
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Note (1): Eastward and northward offset of the H II region from the galaxy
nucleus as projected on the sky, in arcseconds.
Identified as [FLM2007] Gal (+xxxx+yyyy) in Simbad.
Note (2): Deprojected galactocentric radius of the HII region using i and
φ from Table 3.
Note (3): corrected for underlying stellar absorption but not for Galactic
reddening, assuming an equivalent width for absorption of 1.9Å
(see McCall et al., 1985ApJS...57....1M 1985ApJS...57....1M).
Note (4): a = absence of oxygen line data, resulting in the use of eq. (4)
or eq. (5) to determine the temperature, and hence log(O/H).
Note (5): Intrinsic Balmer flux ratio based on the HII region's equilibrium
temperature and an electron density of 100cm-3
Note (6): Extragalactic optical depth at 1um of the HII region, i.e., the
difference between the total optical depth and the Galactic optical
depth.
Note (7): References as follows:
BK82 = Blair et al., 1982ApJ...254...50B 1982ApJ...254...50B
FL07 = This study
MR85 = McCall et al., 1985ApJS...57....1M 1985ApJS...57....1M
KA81 = Kwitter & Aller, 1981MNRAS.195..939K 1981MNRAS.195..939K
RP82 = Rayo et al., 1982ApJ...255....1R 1982ApJ...255....1R
SK96 = Skillman et al., 1996ApJ...462..147S 1996ApJ...462..147S
SS91 = Shields & Skillman, 1991ApJ...371...82S 1991ApJ...371...82S
VP88 = Vilchez et al., 1988MNRAS.235..633V 1988MNRAS.235..633V
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Gal Galaxy
10 I1 --- TType Morphological stage from RC3 (VII/155)
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 21 F4.1 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 31 I2 arcsec DEs Declination (J2000)
32 A1 ---- r [a] a: position from Buta & McCall
(1999ApJS..124...33B 1999ApJS..124...33B), else RC3 (VII/155)
34- 37 I4 km/s HRV Heliocentric radial velocity from the HI
reference
38 A1 --- r_HRV [b] b: HRV from Newton (1980MNRAS.191..169N 1980MNRAS.191..169N),
else RC3 (Cat. VII/155)
40- 41 I2 deg i Inclination angle from the HI reference
42 A1 --- r_i [b] b: i from Newton (1980MNRAS.191..169N 1980MNRAS.191..169N),
else RC3 (Cat. VII/155)
44- 46 I3 deg phi Position angle from the HI reference
47 A1 --- r_phi [b] b: phi from Newton (1980MNRAS.191..169N 1980MNRAS.191..169N),
else RC3 (Cat. VII/155)
49- 53 F5.1 arcsec r0 Disk scale length (1)
55- 59 F5.3 mag E(B-V) ?=- Galactic reddening from Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S)
61- 65 F5.3 --- tau ?=- Optical depth of Galactic dust at 1um
calculated from E(B-V)
67- 70 A4 --- HIref Source of the HI map of the galaxy (2)
72- 75 A4 --- COref Source of the CO distribution of the galaxy (2)
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Note (1): The radius at which the surface brightness in B drops to 1/e of
its central value from Skillman et al. (1996ApJ...462..147S 1996ApJ...462..147S) (NGC 4501
and NGC 4654), Buta & McCall (1999ApJS..124...33B 1999ApJS..124...33B) (Maffei 2 and IC 342),
and Zaritsky et al. (1994ApJ...420...87Z 1994ApJ...420...87Z) (for all other galaxies).
Note (2): References as follows:
BG81 = Bosma et al., 1981A&A....93..106B 1981A&A....93..106B
HT96 = Hurt et al., 1996ApJ...466..135H 1996ApJ...466..135H
KS91 = Kenney et al., 1991ApJ...366..432K 1991ApJ...366..432K
KY88 = Kenney & Young, 1988ApJS...66..261K 1988ApJS...66..261K
MW04 = Mason & Wilson, 2004ApJ...612..860M 2004ApJ...612..860M
N80a = Newton, 1980MNRAS.191..169N 1980MNRAS.191..169N
N80b = Newton, 1980MNRAS.191..615N 1980MNRAS.191..615N
TA91 = Tilanus & Allen, 1991A&A...244....8T 1991A&A...244....8T
W88 = Warmels, 1988A&AS...72..427W 1988A&AS...72..427W
WV86 = Wevers et al., 1986A&AS...66..505W 1986A&AS...66..505W
YX95 = Young et al., 1995ApJS...98..219Y 1995ApJS...98..219Y
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Dec-2008