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J/MNRAS/451/1307    HII regions in 10 galaxies (Zaragoza-Cardiel+, 2015)

Comparative internal kinematics of the HII regions in interacting and isolated galaxies: implications for massive star formation modes. Zaragoza-Cardiel J., Beckman J.E., Font J., Garcia-Lorenzo B., Camps-Farina A., Fathi K., James P.A., Erroz-Ferrer S., Barrera-Ballesteros J., Cisternas M. <Mon. Not. R. Astron. Soc. 451, 1307 (2015)> =2015MNRAS.451.1307Z
ADC_Keywords: Galaxies, nearby ; H II regions Keywords: stars: formation - HII regions - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: starburst Abstract: We have observed 10 interacting galaxy pairs using the Fabry-Perot interferometer GHαFaS (Galaxy Hα Fabry-Perot system) on the 4.2m William Herschel Telescope (WHT) at the Observatorio del Roque de los Muchachos, La Palma. We present here the Hα surface brightness, velocity and velocity dispersion maps for the 10 systems we have not previously observed using this technique, as well as the physical properties (sizes, Hα luminosities and velocity dispersion) of 1259 HII regions from the full sample. We also derive the physical properties of 1054 HII regions in a sample of 28 isolated galaxies observed with the same instrument in order to compare the two populations of HII regions. We find a population of the brightest HII regions for which the scaling relations, for example the relation between the Hα luminosity and the radius, are clearly distinct from the relations for the regions of lower luminosity. The regions in this bright population are more frequent in the interacting galaxies. We find that the turbulence, and also the star formation rate, are enhanced in the HII regions in the interacting galaxies. We have also extracted the Hα equivalent widths for the HII regions of both samples, and we have found that the distribution of HII region ages coincides for the two samples of galaxies. We suggest that the SFR enhancement is brought about by gas flows induced by the interactions, which give rise to gravitationally bound gas clouds which grow further by accretion from the flowing gas, producing conditions favourable to star formation. Description: We observed the interacting galaxies with GHαFaS, a Fabry-Perot interferometer mounted on the WHT (William Herschel Telescope) at the Roque de los Muchachos Observatory, La Palma. Objects: ------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------- 01 24 35.1 +03 47 33 NGC 520 = LEDA 5193 06 18 37.7 +78 21 25 NGC 2146 = UGC 3429 07 44 09.3 +29 14 48 UGC 3995 = LEDA 21673 09 14 05.1 +40 06 49 NGC 2782 = LEDA 26034 09 45 42.0 -14 19 35 NGC 2992 = LEDA 27982 09 45 48.3 -14 22 06 NGC 2993 = LEDA 27991 11 37 44.1 +47 53 35 NGC 3769 = UGC 6595 11 39 42.5 +31 54 33 NGC 3786 = LEDA 36158 11 39 44.6 +31 55 52 NGC 3788 = LEDA 36160 11 57 31.1 +32 20 16 NGC 3991 = UGC 6933 ------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 118 1256 Physical properties of the brightest HII regions in interacting galaxies tablea2.dat 118 1043 Physical properties of the brightest HII regions in isolated galaxies list.dat 117 36 List of fits files fits/* 0 36 Individual fits files
See also: J/A+A/393/389 : Hα in spiral galaxies HII regions (Marquez+, 2002) J/A+A/481/645 : HII regions in interacting galaxies (Ferreiro+, 2008) J/other/RAA/14.1393 : HII regions in interacting system Arp 86 (Zhou+, 2014) Byte-by-byte Description of file: tablea1.dat tablea2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/303] Consecutive number in catalog, within the galaxy 5- 11 A7 --- Name Galaxy name 13- 14 I2 h RAh Right Ascension (J2000) 16- 17 I2 min RAm Right Ascension (J2000) 19- 22 F4.1 s RAs [0/60] Right Ascension (J2000) 24 A1 --- DE- Declination sign (J2000) 25- 26 I2 deg DEd Declination (J2000) 28- 29 I2 arcmin DEm Declination (J2000) 31- 34 F4.1 arcsec DEs [0/60] Declination (J2000) 36- 41 F6.3 [10-7W] logLHa [35/41] Log of Hα luminosity (erg/s) 43- 47 F5.3 [10-7W] e_logLHa [0.006/0.4] Log of Hα luminosity error 49- 51 I3 pc R [16/481] Globular radius 53- 54 I2 pc e_R [1/50] Radius error 56- 59 F4.2 [Msun] logMHII [3.2/7.6] Ionized gas mass 61- 64 F4.2 [Msun] e_logMHII [0.03/0.9] Ionized gas mass error 66- 71 F6.4 Msun/pc3 rhoHII [0.007/0.37] Ionized gas density ρHII 73- 78 F6.4 Msun/pc3 e_rhoHII [0.0004/0.09] Ionized gas density error 81- 84 F4.1 km/s sigma [4/43] Velocity dispersion σ 86- 89 F4.1 km/s e_sigma [0.3/10]? Velocity dispersion error 91- 97 F7.1 --- alpVir [1/10000]? Virial parameter (αvir) (1) 99-104 F6.1 --- e_alpVir [0.5/7000]? Virial parameter error 106-112 F7.2 0.1nm EWHa [0.03/2033]? Hα equivalent width 114-118 F5.3 [yr] logAge [6.3/7.8]? Log of Age
Note (1): the virial parameter is: αvir = 5σ2R / (G Mgas)
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 24 F5.3 arcsec/pix Scale [0.197/0.201] Scale of the image 26- 29 I4 --- Nx [1024] Number of pixels along X-axis 31- 34 I4 --- Ny [1024] Number of pixels along Y-axis 36- 37 I2 --- Nz [48]? Number of slices for datacubes 39- 46 F8.3 km/s V.min [557/4574]? Lower value of velocity interval for datacubes 48- 55 F8.3 km/s V.max [946/4952]? Upper value of velocity interval for datacubes 57- 63 F7.5 km/s dV [8/8.3]? Velocity resolution for datacubes 65- 70 I6 Kibyte Size [4103/196619] Size of FITS file 72-117 A46 --- FileName Name of the file, in subdirectory "fits"
Acknowledgements: Javier Zaragoza-Cardiel, jzc(at)iac.es Hsitory: * 12-Jun-2015: first on-line version * 12-Dec-2015: first digit of Sequential number of tablea1 restored * 16-Mar-2017: tables a1 and a2 corrected (from author)
(End) Patricia Vannier [CDS] 12-Jun-2015
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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