J/ApJ/862/25 H{alpha} & UV emission scale heights for edge-on gal. (Jo+, 2018) ================================================================================ Comparison of the extraplanar H{alpha} and UV emissions in the halos of nearby edge-on spiral galaxies. Jo Y.-S., Seon K.-I., Shinn J.-H., Yang Y., Lee D., Min K.-W. =2018ApJ...862...25J ================================================================================ ADC_Keywords: Galaxies, nearby; Ultraviolet; Optical; Interstellar medium Keywords: dust, extinction ; H II regions ; ISM: structure ; line: formation ; radiative transfer ; scattering Abstract: We compare vertical profiles of the extraplanar H{alpha} emission to those of the UV emission for 38 nearby edge-on late-type galaxies. It is found that detection of the "diffuse" extraplanar dust (eDust), traced by the vertically extended, scattered UV starlight, always coincides with the presence of the extraplanar H{alpha} emission. A strong correlation between the scale heights of the extraplanar H{alpha} and UV emissions is also found; the scale height at H{alpha} is found to be ~0.74 of the scale height at FUV. Our results may indicate the multiphase nature of the diffuse ionized gas and dust in the galactic halos. The existence of eDust in galaxies where the extraplanar H{alpha} emission is detected suggests that a larger portion of the extraplanar H{alpha} emission than that predicted in previous studies may be caused by H{alpha} photons that originate from HII regions in the galactic plane and are subsequently scattered by the eDust. This possibility raise an advantage in studying the extraplanar diffuse ionized gas. We also find that the scale heights of the extraplanar emissions normalized to the galaxy size correlate well with the star formation rate surface density of the galaxies. The properties of eDust in our galaxies is on a continuation line of that found through previous observations of the extraplanar polycyclic aromatic hydrocarbons emission in more active galaxies known to have galactic winds. Description: We analyzed the narrowband H{alpha} and UV images of the nearby late-type edge-on galaxies, which were taken from previous H{alpha} and UV galaxy surveys (see reference papers in Table 1). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 91 38 Galaxy sample table2.dat 62 38 Scale heights of the sample galaxies -------------------------------------------------------------------------------- See also: VII/109 : IRAS Observations of Large Optical Galaxies (Rice+, 1988) VII/141 : Spectrophotometric Atlas of Galaxies (Kennicutt Jr. 1992) II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017) J/A+A/414/23 : CCD H{alpha} and R photometry of 334 galaxies (James+, 2004) J/ApJS/165/307 : Survey for ionization in neutral gas gal. I. (Meurer+, 2006) J/ApJS/178/247 : H{alpha} and [NII] survey in local 11 Mpc (Kennicutt+, 2008) J/ApJ/703/517 : The Spitzer Local Volume Legacy: IR photometry (Dale+, 2009) J/ApJS/190/233 : Spectroscopy & abundances of SINGS galaxies (Moustakas+, 2010) J/A+A/545/A16 : Halpha3. Catalog and SFR in Virgo cluster (Gavazzi+, 2012) http://www.astro.ljmu.ac.uk/HaGS/fits/index.html : H{alpha}GS FITS images http://irsa.ipac.caltech.edu/data/SPITZER/SINGS/ : SINGS Spitzer and Ancillary data archive on IRSA. Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Seq [1/38] Running index number 4- 17 A14 --- Name Galaxy name taken from NED 19- 28 A10 --- Morph Galaxy morphology 30- 35 F6.2 deg GLON [10.7/357.8] Galactic longitude 37- 42 F6.2 deg GLAT [-74.6/84.3] Galactic latitude 44- 48 F5.2 pc Dist [4.1/26.9] Average value of the redshift-independent distances from NED 50- 54 F5.2 arcmin Dmaj [1.3/19.4] Major axis diameter in arcmin 56- 59 F4.1 kpc D25 [3.7/47.3] Major axis diameter in kpc calculated using col. Dist and Dmag 61- 66 F6.3 10+33W LHa [0.1/11.5]? Integrated H{alpha} luminosity from reference papers (x10^40^erg/s) 68- 73 F6.4 Msun/yr SFH-Ha [0.01/1]? Star formation rate based on the H{alpha} luminosity 75- 80 F6.4 Msun/yr SFH-FIR [0.0009/1.6] Star formation rate estimated using the FIR luminosity 82- 91 A10 --- Ref Reference papers (1) -------------------------------------------------------------------------------- Note (1): Reference papers as follows: H{alpha}3 = H{alpha} narrow band imaging survey of galaxies, Gavazzi+ (2003A&A...400..451G, 2012, J/A+A/545/A16); H{alpha}GS = H{alpha} Galaxy Survey, James+ (2004, J/A+A/414/23); LVL = Spitzer Local Volume Legacy, Kennicutt+ (2008, J/ApJS/178/247), Dale+ (2009, J/ApJ/703/517); Rossa = Rossa & Dettmar (2003A&A...406..493R, 2003A&A...406..505R); SINGG = Survey for Ionization in Neutral Gas Galaxies, Meurer+ (2006, J/ApJS/165/307); SINGS = Spitzer Infrared Nearby Galaxies Survey, Kennicutt+ (2003PASP..115..928K), Moustakas+ (2010, J/ApJS/190/233). -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Seq [1/38] Running index number 4- 17 A14 --- Name Galaxy name taken from NED 19- 19 A1 --- Group Group (2) 21- 26 F6.4 Msun/yr SFH-FIR [0.0009/1.6] Star formation rate estimated using the FIR luminosity 28- 32 F5.3 kpc ZHa [0.1/1.4] Scale height, H{alpha} 34- 38 F5.3 kpc e_ZHa [0.002/0.3] Uncertainty in ZHa 40- 44 F5.3 kpc ZFUV [0.1/2.035] Scale height, FUV 46- 50 F5.3 kpc e_ZFUV [0.004/0.5] Uncertainty in ZFUV 52- 56 F5.3 kpc ZNUV [0.1/2] Scale height, NUV 58- 62 F5.3 kpc e_ZNUV [0.007/0.5] Uncertainty in ZNUV -------------------------------------------------------------------------------- Note (2): The sample galaxies were divided into two groups for convenience, as follows: A = scale height of less than 0.4kpc in both UV wavelength bands (17 occurrences); B = scale height greater than 0.4kpc in both UV bands (21 occurrences). See section 3.2 for further explanations. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Jul-2019