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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
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:
FileName Lrecl Records Explanations
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
See also: J/A+AS/124/559 : VI photometry of dwarf galaxies (Karanchentsev+ 1997) Byte-by-byte Description of file: table[24].dat
Bytes Format Units Label Explanations
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 Halpha-to-Hbeta 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)
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). 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 FL07 = This study MR85 = McCall et al., 1985ApJS...57....1M KA81 = Kwitter & Aller, 1981MNRAS.195..939K RP82 = Rayo et al., 1982ApJ...255....1R SK96 = Skillman et al., 1996ApJ...462..147S SS91 = Shields & Skillman, 1991ApJ...371...82S VP88 = Vilchez et al., 1988MNRAS.235..633V
Byte-by-byte Description of file: table3.dat
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), 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), 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), 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), 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) 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)
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) (NGC 4501 and NGC 4654), Buta & McCall (1999ApJS..124...33B) (Maffei 2 and IC 342), and Zaritsky et al. (1994ApJ...420...87Z) (for all other galaxies). Note (2): References as follows: BG81 = Bosma et al., 1981A&A....93..106B HT96 = Hurt et al., 1996ApJ...466..135H KS91 = Kenney et al., 1991ApJ...366..432K KY88 = Kenney & Young, 1988ApJS...66..261K MW04 = Mason & Wilson, 2004ApJ...612..860M N80a = Newton, 1980MNRAS.191..169N N80b = Newton, 1980MNRAS.191..615N TA91 = Tilanus & Allen, 1991A&A...244....8T W88 = Warmels, 1988A&AS...72..427W WV86 = Wevers et al., 1986A&AS...66..505W YX95 = Young et al., 1995ApJS...98..219Y
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Dec-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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