J/MNRAS/431/2006 PAH in extragalactic star-forming complexes (Khramtsova+, 2013)
Polycyclic aromatic hydrocarbons in spatially resolved extragalactic
star-forming complexes.
Khramtsova M.S., Wiebe D.S., Boley P.A., Pavlyuchenkov YA.N.
<Mon. Not. R. Astron. Soc., 431, 2006-2016 (2013)>
=2013MNRAS.431.2006K 2013MNRAS.431.2006K
ADC_Keywords: Galaxies, nearby ; H II regions ; Photometry, infrared
Keywords: galaxies: photometry - infrared: galaxies
Abstract:
The abundance of polycyclic aromatic hydrocarbons (PAHs) in low- and
high-metallicity galaxies has been widely discussed since the time
when detailed infrared data for extragalactic objects were first
obtained. On the scales of entire galaxies, a smaller PAH abundance in
lower metallicity galaxies is often observed. We study this
relationship for star-forming regions in nearby galaxies, for a sample
containing more than 200 HII complexes, using spatially resolved
observations from the Herschel Space Observatory and Spitzer Space
Telescope. We use a model for the dust emission to estimate the
physical parameters (PAH abundance, metallicity, ultraviolet radiation
field, etc.) of these complexes. The same correlation of PAH abundance
with metallicity, as seen for entire galaxies, is apparently preserved
at smaller scales, at least when the Kobulnicky and Kewley metallicity
calibration is used. We discuss possible reasons for this correlation,
noting that traces of less effective PAH formation in low-metallicity
asymptotic giant branch stars should be smeared out by radial mixing
in galactic discs. Effective destruction by the harder and more
intensive ultraviolet field in low-metallicity environments is
qualitatively consistent with our data, as the ultraviolet field
intensity, derived from the infrared photometry, is indeed smaller in
HII complexes with lower metallicity.
Description:
For this work, we consider 24 galaxies which were observed with both
the Spitzer Space Telescope and the Herschel Space Observatory. All of
the Spitzer data examined in this paper were observed as part of the
SINGS survey (Kennicutt et al. 2003PASP..115..928K 2003PASP..115..928K), and most of the
Herschel data were observed as part of the KINGFISH survey (Kennicutt
et al. 2011PASP..123.1347K 2011PASP..123.1347K), although we also include data for three
galaxies (NGC 2403, NGC 6822, NGC 5194) which were observed with
Herschel as parts of other programmes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 24 Sample of galaxies
refs.dat 71 21 References
table2.dat 138 207 Parameters of HII regions
table3.dat 96 207 Fitting parameters of HII regions and metallicites
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See also:
J/ApJ/640/768 : IR sources in the NGC 5291 system (Higdon+, 2006)
J/ApJ/686/127 : Starbursts luminosities based on PAH (Weedman+, 2008)
J/ApJ/705/885 : PAH in galaxies at z∼0.1 (O'Dowd+, 2009)
J/A+A/507/713 : Galaxies with strong PAH emission (Haas+, 2009)
J/ApJ/701/1965 : Radial dust properties of SINGS galaxies (Munoz-Mateos+, 2009)
J/A+A/514/A5 : PAH luminous galaxies at z∼1 (Takagi+, 2010)
J/A+A/527/A109 : Dust and PAH emission SEDs of disk galaxies (Popescu+, 2011)
J/ApJ/729/94 : IR spectroscopy of PAH in 6-15µm band (Ricca+, 2011)
J/ApJ/744/20 : S4MC project: 6 star forming regions PAHs (Sandstrom+, 2012)
J/ApJS/207/7 : Modeling Galactic extinction with dust and PAH (Mulas+, 2013)
J/PASJ/65/103 : PAH3.3um/IR luminosity for infrared galaxies (Yamada+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Gal Galaxy name
13- 27 A15 --- PropID Spitzer proposal ID
29- 40 A12 --- Prop Proposer name
42- 50 A9 --- MType Morphological type
52- 53 I2 ---- Nc [1/23] Number of complexes
55- 61 A7 --- Ref Reference(s), in refs.dat file
63- 66 F4.2 kpc Res Physical resolution
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 53 A30 --- Aut Author's name
54- 71 A18 --- Com Comments
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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- 11 A11 --- Gal Galaxy name
13- 15 I3 --- Seq Sequential number
17- 27 A11 --- Name HII region name (within galaxy)
28 A1 --- f_Name [*] Source added at CDS (1)
29- 30 I2 h RAh Right ascension (J2000)
32- 33 I2 min RAm Right ascension (J2000)
35- 39 F5.2 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 51 F4.1 arcsec DEs Declination (J2000)
53- 56 F4.1 arcsec Rad ? Aperture radius
58- 61 F4.2 mJy F3.6 ? Spitzer/IRAC flux at 3.6um
63- 66 F4.2 mJy e_F3.6 ? rms uncertainty on F3.6
68- 71 F4.2 mJy F4.5 ? Spitzer/IRAC flux at 4.5um
73- 76 F4.2 mJy e_F4.5 ? rms uncertainty on F4.5
78- 82 F5.2 mJy F5.8 ? Spitzer/IRAC flux at 5.8um
84- 87 F4.2 mJy e_F5.8 ? rms uncertainty on F5.8
89- 94 F6.2 mJy F8.0 ? Spitzer/IRAC flux at 8.0um
96-100 F5.2 mJy e_F8.0 ? rms uncertainty on F8.0
102-106 F5.1 mJy F24 ? Spitzer/MIPS flux at 24um
108-112 F5.2 mJy e_F24 ? rms uncertainty on F24
114-119 F6.1 mJy F70 ?=- Spitzer/MIPS flux at 70um
121-125 F5.1 mJy e_F70 ? rms uncertainty on F70
127-132 F6.1 mJy F160 ?=- Herschel/PACS flux at 160um
134-138 F5.1 mJy e_F160 ? rms uncertainty on F160
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Note (1): Source 85 (NGC3198, +038+044) was missing in table2. Position
added by CDS, calculated with the offsets of the name.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Gal Galaxy
13- 15 I3 --- Seq Sequential number
17- 27 A11 --- Name HII region name (within galaxy)
30- 32 F3.1 % qPAH [0.5/4.6]?=- PAH mass fraction
34- 36 F3.1 % E_qPAH [0.1/4.4]?=- Error on qPAH (upper value)
38- 40 F3.1 % e_qPAH [0.1/1.4]?=- Error on qPAH (lower value)
42- 45 F4.1 % gamma [0.1/30]?=- Fraction of dust γ heated by
radiation field with intensity greater than Umin
47- 52 F6.4 % E_gamma ?=- Error on gamma (upper value)
54- 60 F7.5 % e_gamma ?=- Error on gamma (lower value)
62- 66 F5.2 mag Umin ?=- Minimum starlight intensity
68- 70 F3.1 mag E_Umin ?=- Error on Umin (upper value)
72- 74 F3.1 mag e_Umin ?=- Error on Umin (lower value)
76 A1 --- l_Ab(O)K [~] Limit flag on Ab(O)K
77- 80 F4.2 [-] Ab(O)K KK04 abundance 12+log(O/H) (2)
82- 85 F4.2 [-] e_Ab(O)K rms uncertainty on Ab(O)K
87 A1 --- l_Ab(O)P [~] Limit flag on Ab(O)P
88- 91 F4.2 [-] Ab(O)P ?=- PT05 abundance 12+log(O/H) (2)
93- 96 F4.2 [-] e_Ab(O)P ?=- rms uncertainty on Ab(O)P
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Note (2): Abundances with methods:
KK04 = Kobulnicky and Kewley, 2004ApJ...617..240K 2004ApJ...617..240K, Cat. J/ApJ/617/240
PT05 = Pilyugin and Thuan, 2005ApJ...631..231P 2005ApJ...631..231P
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Jun-2014