J/ApJ/808/42 CHemical Abundances of Spirals (CHAOS) II. M51 (Croxall+, 2015)
CHAOS.
II. Gas-phase abundances in NGC 5194.
Croxall K.V., Pogge R.W., Berg D.A., Skillman E.D., Moustakas J.
<Astrophys. J., 808, 42 (2015)>
=2015ApJ...808...42C 2015ApJ...808...42C (SIMBAD/NED BibCode)
ADC_Keywords: Abundances ; Galaxies, nearby ; Spectroscopy
Keywords: galaxies: abundances; galaxies: individual: NGC 5194;
galaxies: spiral; H ii regions; ISM: abundances
Abstract:
We have observed NGC 5194 (M51a) as part of the CHemical Abundances of
Spirals project (CHAOS). Using the Multi Object Double Spectrographs
on the Large Binocular Telescope we are able to measure one or more of
the temperature-sensitive auroral lines ([OIII]λ4363,
[NII]λ5755, [SIII]λ6312) and thus measure "direct"
gas-phase abundances in 29 individual HII regions. [OIII]λ4363
is only detected in two HII regions, both of which show indications of
excitation by shocks. We compare our data to previous direct
abundances measured in NGC 5194 and find excellent agreement
(Δ[log(O/H)]∼0.05) for all but one region. We find no evidence
of trends in Ar/O, Ne/O, or S/O within NGC 5194 or compared to other
galaxies. We find modest negative gradients in both O/H and N/O with
very little scatter (σ≤0.08dex), most of which can be
attributed to random error and not to intrinsic dispersion. The
gas-phase abundance gradient is consistent with the gradients observed
in other interacting galaxies, which tend to be shallower than
gradients measured in isolated galaxies. The N/O ratio
(<log(N/O)≥-0.62) suggests secondary nitrogen production is
responsible for a significantly larger fraction of nitrogen (e.g.,
factor of 8-10), relative to primary production mechanisms than
predicted by theoretical models.
Description:
Optical spectra of NGC 5194 were acquired with the Multi-Object Double
Spectrographs (MODS) on the Large Binocular Telescope (LBT) as part of
the CHemical Abundances of Spirals project (CHAOS) study during 2012
April. We obtained broad spectral coverage extending from
3100-10000Å with the G400L (R∼1850) and G670L (R∼2300) gratings.
Objects:
---------------------------------------------
RA (ICRS) DE Designation(s)
---------------------------------------------
13 29 52.70 +47 11 42.9 NGC 5194 = M 51
---------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 73 64 *NGC 5194 MODS/LBT observations
table3a.dat 60 4736 Line fluxes relative to Hβ
table3b.dat 65 64 Equivalent widths
table5.dat 354 29 Abundances in NGC 5194
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Note on table2.dat: Observing logs for HII regions observed in NGC 5194 using
MODS on the LBT on the UT dates of 2012 April 29 and 30. Each field was
observed over an integrated exposure time of 1200s on clear nights, with, on
average ∼1.00" seeing, and airmasses less than 1.5. Slit ID.
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See also:
J/ApJ/806/16 : CHemical Abundances of Spirals (CHAOS) I. NGC628 (Berg+, 2015)
J/MNRAS/424/2316 : Abundances in HII regions (Pilyugin+, 2012)
J/ApJ/735/75 : HST observations of HII regions in M51 (Lee+, 2011)
J/ApJS/190/233 : Spectroscopy & abundances of SINGS galaxies (Moustakas+, 2010)
J/AJ/140/416 : IR photometry of massive stars in the SMC (Bonanos+, 2010)
J/ApJ/700/654 : Keck spectroscopy of extragalactic HII regions (Esteban+ 2009)
J/ApJ/695/580 : Oxygen abundance in M83 (Bresolin+, 2009)
J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)
J/ApJ/675/1213 : Abundances in M33 HII regions (Rosolowsky+, 2008)
J/AJ/133/2559 : Compact radio sources in spiral galaxies. II. (Maddox+, 2007)
J/A+A/441/981 : HII regions in 5 spiral galaxies (Bresolin+, 2005)
J/ApJ/617/240 : Oxygen abundances in the GOODS-North field (Kobulnicky+, 2004)
J/AJ/126/2867 : Red supergiants in Magellanic Clouds (Massey+, 2003)
J/ApJ/424/599 : Abundances in barred spiral galaxies (Martin+ 1994)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- HIIid HII Region (NGC5194 ±offsets in RA/DE) (1)
21- 22 I2 h RAh [13] Hour of Right Ascension (J2000)
24- 25 I2 min RAm [29/30] Minute of Right Ascension (J2000)
27- 30 F4.1 s RAs Second of Right Ascension (J2000)
32 A1 --- DE- [+] Sign of Declination (J2000)
33- 34 I2 deg DEd [47] Degree of Declination (J2000)
36- 37 I2 arcmin DEm [8/15] Arcminute of Declination (J2000)
39- 43 F5.2 arcsec DEs Arcsecond of Declination (J2000)
45- 50 F6.2 arcsec Rgarc Deprojected HII distance from galaxy center
52- 56 F5.3 --- RgR25 Deprojected HII distance from galaxy center (2)
58- 61 F4.2 kpc Rgkpc Deprojected HII distance from galaxy center
63 I1 --- dOIII [0,1] 3σ [OIII] 4363A detection
65 I1 --- dNII [0,1] 3σ [NII] 5755A detection
67 I1 --- dSIII [0,1] 3σ [SIII] 6312A detection
69 I1 --- dOII [0,1] 3σ [OII] 7330A detection
71 I1 --- dSII [0,1] 3σ [SII] 6717A/6731A detection
73 I1 --- WR [0,1] Detection of Wolf-Rayet features
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Note (1): Galaxy name and the offset in RA and DEC, in arcseconds, from the
central position 13:29:52.7+47:11:43 (J2000).
NGC5194+3.3+9.1 added by CDS to match regions observed in table 3
(see the Acknowledgement section below).
Note (2): In units of the 25th mag isophotal radius; RC3 (de Vaucouleurs, 1991,
Cat. VII/155)
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Byte-by-byte Description of file: table3a.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- HIIid HII Region (NGC5194 ±offsets in RA/DE)
21- 30 A10 --- Species Species
32- 35 I4 0.1nm lambda [346/9546]? Species Wavelength in Angstroms
37 A1 --- l_Flux Upper limit flag on Flux
39- 49 F11.5 --- Flux [0/10485]? Line flux in units of Hβ=1
51- 60 F10.5 --- e_Flux [0/11]? uncertainty in Flux
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Byte-by-byte Description of file: table3b.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- HIIid HII Region (NGC5194 ±offsets in RA/DE)
21- 25 F5.3 --- CHb [0.1/1.1] Extinction Correction for Hβ
Flux C(Hβ)
27- 31 F5.3 --- e_CHb [0.01/0.03] CHb uncertainty
33- 39 F7.2 10+14W/m2 FHb [26/2218] Hβ Flux F(Hβ)
in units of 10-17ergs/s/cm^2
41- 44 F4.1 10+14W/m2 e_FHb [0.7/11] FHb uncertainty
46- 54 F9.4 0.1nm EWHb [10.7/1677] Hβ equivalent Width
in units of Angstroms
56- 65 F10.4 0.1nm EWHa [43.2/10485] Hα equivalent Width
in units of Angstroms
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- HIIid HII Region (NGC5194 ±offsets in RA/DE)
21- 25 I5 K Te([OII])1 ? Measured Electron temperature in
the [OII] region
27- 30 I4 K e_Te([OII])1 ? Uncertainty in Te([OII])1
32- 35 I4 K Te([OIII])1 ? Measured Electron temperature in
the [OIII] region
37- 40 I4 K e_Te([OIII])1 ? Uncertainty in Te([OIII])1
42- 45 I4 K Te([NII])1 ? Measured Electron temperature in
the [NII] region
47- 50 I4 K e_Te([NII])1 ? Uncertainty in Te([NII])1
52- 55 I4 K Te([SIII])1 ? Measured Electron temperature in
the [SIII] region
57- 60 I4 K e_Te([SIII])1 ? Uncertainty in Te([SIII])1
62- 64 I3 cm-3 Ne1 Measured Electron density (cm^{-3})
66- 67 I2 cm-3 e_Ne1 Uncertainty in Ne1
69- 72 I4 K Te([OII])2 Adopted Electron temperature in
the [OII] region
74- 76 I3 K e_Te([OII])2 Uncertainty in Te([OII])2
78- 81 I4 K Te([OIII])2 Adopted Electron temperature in
the [OIII] region
83- 85 I3 K e_Te([OIII])2 Uncertainty in Te([OIII])2
87- 90 I4 K Te([NII])2 Adopted Electron temperature in
the [NII] region
92- 94 I3 K e_Te([NII])2 Uncertainty in Te([NII])2
96- 99 I4 K Te([SIII])2 Adopted Electron temperature in
the [SIII] region
101-103 I3 K e_Te([SIII])2 Uncertainty in Te([SIII])2
105-107 I3 cm-3 Ne2 Adopted Electron density
109-111 I3 cm-3 e_Ne2 Uncertainty in Ne2
113-116 F4.1 10-5 O+/H+ Abundance ratio O+/H+
118-121 F4.1 10-5 e_O+/H+ Uncertainty in O+/H+
123-127 F5.2 10-5 O++/H+ Abundance ratio O++/H+
129-132 F4.1 10-5 e_O++/H+ Uncertainty in O++/H+
134-138 F5.3 [-] logO/H Oxygen abundance, 12+log(O/H)
140-144 F5.3 [-] e_logO/H Uncertainty in O/H
146-150 F5.1 10-6 N+/H+ Abundance ratio N+/H+
152-155 F4.1 10-6 e_N+/H+ Uncertainty in N+/H+
157-160 F4.2 --- ICF(N) Nitrogen ionization correction factor
162-165 F4.2 --- e_ICF(N) Uncertainty in ICF(N)
167-172 F6.3 [-] log(N/O) Nitrogen-to-oxygen abundance ratio, log(N/O)
174-178 F5.3 [-] e_log(N/O) Uncertainty in O/H
180-184 F5.3 [-] log(N/H) Nitrogen abundance, 12+log(N/H)
186-190 F5.3 [-] e_log(N/H) Uncertainty in N/H
192-195 F4.1 10-7 S+/H+ Abundance ratio S+/H+
197-200 F4.1 10-7 e_S+/H+ Uncertainty in S+/H+
202-206 F5.1 10-7 S++/H+ Abundance ratio S++/H+
208-211 F4.1 10-7 e_S++/H+ Uncertainty in S++/H+
213-217 F5.3 --- ICF(S) Sulfer ionization correction factor
219-223 F5.3 --- e_ICF(S) Uncertainty in ICF(S)
225-230 F6.3 [-] log(S/O) Sulfer-to-oxygen abundance ratio, log(S/O)
232-236 F5.3 [-] e_log(S/O) Uncertainty in S/O
238-242 F5.3 [-] log(S/H) Sulfer abundance, 12+log(S/H)
244-248 F5.3 [-] e_log(S/H) Uncertainty in S/H
250-256 F7.2 10-6 Ne++/H+ ? Abundance ratio Ne++/H+
258-264 F7.2 10-6 e_Ne++/H+ ? Uncertainty in Ne++/H+
266-269 F4.2 --- ICF(Ne) Neon ionization correction factor
271-274 F4.2 --- e_ICF(Ne) Uncertainty in ICF(Ne)
276-283 F8.3 [-] log(Ne/O) ? Neon-to-oxygen abundance ratio, log(Ne/O)
285-292 F8.3 [-] e_log(Ne/O) ? Uncertainty in Ne/O
294-300 F7.2 [-] log(Ne/H) ? Neon abundance, 12+log(Ne/H)
302-308 F7.2 [-] e_log(Ne/H) ? Uncertainty in Ne/H
310-314 F5.2 10-7 Ar++/H+ Abundance ratio Ar++/H+
316-319 F4.2 10-7 e_Ar++/H+ Uncertainty in Ar++/H+
321-324 F4.2 --- ICF(Ar) Argon ionization correction factor
326-329 F4.2 --- e_ICF(Ar) Uncertainty in ICF(Ar)
331-336 F6.3 [-] log(Ar/O) Argon-to-oxygen abundance ratio, log(Ar/O)
338-342 F5.3 [-] e_log(Ar/O) Uncertainty in Ar/O
344-348 F5.3 [-] log(Ar/H) Argon abundance, 12+log(Ar/H)
350-354 F5.3 [-] e_log(Ar/H) Uncertainty in Ar/H
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History:
* 16-Jul-2015: electronic version of tables 2, 3 and 5 published by AAS.
* 18-Nov-2015: NGC5194+3.3+9.1 added in table 2.
Acknowledgements:
Kevin V. Croxall [Ohio State University] for data of NGC5194+3.3+9.1 added
in table 2.
References:
Berg et al. I. NGC628. 2015ApJ...806...16B 2015ApJ...806...16B Cat. J/ApJ/806/16
Croxall et al. II. NGC5194. 2015ApJ...808...42C 2015ApJ...808...42C This catalog
Croxall et al. III. NGC5457. 2016ApJ...830....4C 2016ApJ...830....4C Cat. J/ApJ/830/4
Berg et al. IV. NGC3184. 2020ApJ...893...96B 2020ApJ...893...96B Cat. J/ApJ/893/96
Skillman et al. V. M101. 2020ApJ...894..138S 2020ApJ...894..138S
Rogers et al. VI. NGC2403. 2021ApJ...915...21R 2021ApJ...915...21R Cat. J/ApJ/915/21
Rogers et al. VII. M33. 2022ApJ...939...44R 2022ApJ...939...44R Cat. J/ApJ/939/44
Berg et al. VIII. M101. 2024ApJ...971...87B 2024ApJ...971...87B
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Nov-2015