J/ApJS/222/16 Herschel obs. of major-merger pairs of z<0.1 galaxies (Cao+, 2016)
Herschel observations of major merger pairs at z=0: dust mass and
star formation.
Cao C., Xu C.K., Domingue D., Buat V., Cheng Y.-W., Gao Y., Huang J.,
Jarrett T.H., Lisenfeld U., Lu N., Mazzarella J., Sun W.-H., Wu H.,
Yun M.S., Ronca J., Jacques A.
<Astrophys. J. Suppl. Ser., 222, 16 (2016)>
=2016ApJS..222...16C 2016ApJS..222...16C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Photometry, millimetric/submm ; Redshifts
Keywords: galaxies: evolution; galaxies: general; galaxies: interactions;
galaxies: starburst
Abstract:
We present Herschel PACS and SPIRE far-infrared (FIR) and
submillimeter imaging observations for a large K-band selected sample
of 88 close major-merger pairs of galaxies (H-KPAIRs) in 6 photometric
bands (70, 100, 160, 250, 350, and 500µm). Among 132 spiral
galaxies in the 44 spiral-spiral (S+S) pairs and 44 spiral-elliptical
(S+E) pairs, 113 are detected in at least 1 Herschel band. The star
formation rate (SFR) and dust mass (Mdust) are derived from the IR
SED fitting. The mass of total gas (Mgas) is estimated by assuming a
constant dust-to-gas mass ratio of 0.01. Star-forming spiral galaxies
(SFGs) in S+S pairs show significant enhancements in both specific
star formation rate (sSFR) and star formation efficiency (SFE), while
having nearly the same gas mass compared to control galaxies. On the
other hand, for SFGs in S+E pairs, there is no significant sSFR
enhancement and the mean SFE enhancement is significantly lower than
that of SFGs in S+S pairs. This suggests an important role for the
disk-disk collision in the interaction-induced star formation. The
Mgas of SFGs in S+E pairs is marginally lower than that of their
counterparts in both S+S pairs and the control sample. Paired galaxies
with and without interaction signs do not differ significantly in
their mean sSFR and SFE. As found in previous works, this much larger
sample confirms that the primary and secondary spirals in S+S pairs
follow a Holmberg effect correlation on sSFR.
Description:
Pairs in H-KPAIR were observed successfully using PACS and SPIRE
photometers in the three PACS bands (70, 100, 160um) and three SPIRE
bands (250, 350, 500um). The observations of 83 pairs were carried out
within our own proposal (OT2cxu2).
The remaining 5 pairs in H-KPAIR were observed by other OT and KPGT
projects, and their Herschel data were taken from the archives. SPIRE
images of two pairs (J1101+5720 and J1429+3534) were taken directly
from HerMES data release v2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 176 H-KPAIR Galaxy Sample
table2.dat 136 132 Herschel 6-band fluxes and physical parameters of
H-KPAIR spirals
table3.dat 136 44 Herschel 6-band fluxes and physical parameters of
H-KPAIR ellipticals
table4.dat 152 132 Herschel 5-band fluxes and physical parameters of
spirals in the control sample
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See also:
VI/139 : Herschel Observation Log (Herschel Science Centre, 2013)
VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJS/221/12 : AGNs in the MIR using AllWISE data (Secrest+, 2015)
J/ApJS/219/18 : LIRAS: LoCuSS IR AGN survey (Xu+, 2015)
J/ApJ/745/95 : Herschel FIR+submm photometry of KINGFISH sample (Dale+, 2012)
J/MNRAS/416/2840 : The 2M++ galaxy redshift catalogue (Lavaux+, 2011)
J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011)
J/AJ/142/122 : SDSS DR7 galaxy/QSOs pairs (Cherinka+, 2011)
J/ApJ/713/330 : Spitzer observations of major-merger galaxies (Xu+, 2010)
J/ApJS/186/427 : Detailed morphology of SDSS galaxies (Nair+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- KPAIR KPAIR ID (JHHMM+DDMM)
12- 28 A17 --- GIDp Galaxy ID, 2MASX (JHHMMSSss+DDMMSSs)
30- 39 F10.6 deg RAdeg Right Ascension (J2000) in decimal degrees
41- 49 F9.6 deg DEdeg Declination (J2000) in decimal degrees
51- 58 F8.6 --- z [0.006/0.091] Redshift taken from SDSS or
other telescopes
60- 64 F5.2 mag Ksmag [9/13.4] Ks magnitude from 2MASS (K20)
66 A1 --- Type Morphological Type: (S)piral or (E)lliptical
68- 70 A3 --- Int Interaction morphological type (1)
72- 85 A14 --- PID Herschel proposal ID
87- 91 F5.2 kpc Sep [6.9/31]? Projected separation (s(p)) between
two galaxies in pairs, kpc
93- 97 F5.1 km/s delVz [0/489]? Difference in radial velocity
(δ(Vz)) between two galaxies in pairs
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Note (1): Interaction morphological type as follows:
INT = with interaction signs (e.g., morphological distortions, tidal tails
and bridges, plumes etc.; 84 sources)
JUS = without clear interacting signs, "just" pair (80 sources)
MER = merger (12 sources).
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- GIDp Galaxy ID, 2MASX (JHHMMSSss+DDMMSSs)
19- 19 A1 --- l_F70 Upper Limit Flag on F70
20- 26 F7.2 mJy F70 [8/9523] Herschel/PACS 70µm Flux, mJy
28- 32 F5.2 mJy e_F70 [3/64]? Uncertainty in F70
34- 34 A1 --- l_F100 Upper Limit Flag on F100
35- 41 F7.2 mJy F100 [8/8821] Herschel/PACS 100µm Flux, mJy
43- 47 F5.2 mJy e_F100 [3/55]? Uncertainty in F100
49- 49 A1 --- l_F160 Upper Limit Flag on F160
50- 57 F8.2 mJy F160 [10/10480] Herschel/PACS 160µm Flux, mJy
59- 63 F5.2 mJy e_F160 [4/79]? Uncertainty in F160
65- 67 A3 --- q_PACS [ACM] PACS quality flag (1)
69- 69 A1 --- l_F250 Upper Limit Flag on F250
70- 76 F7.2 mJy F250 [24/4351] Herschel/SPIRE 250µm Flux, mJy
78- 83 F6.2 mJy e_F250 [7/167]? Uncertainty in F250
85- 85 A1 --- l_F350 Upper Limit Flag on F350
86- 92 F7.2 mJy F350 [20/1991] Herschel/SPIRE 350µm Flux, mJy
94- 98 F5.2 mJy e_F350 [3/78]? Uncertainty in F350
100-100 A1 --- l_F500 Upper Limit Flag on F500
101-106 F6.2 mJy F500 [25/696] Herschel/SPIRE 500µm Flux, mJy
108-112 F5.2 mJy e_F500 [5/64]? Uncertainty in F500
114-116 A3 --- q_SPIRE [AGP] SPIRE quality flag (1)
118-122 F5.2 [Msun] logM* [9.8/11.5] Log Stellar Mass, solar units
124-124 A1 --- l_SFR Upper limit flag on SFR
125-129 F5.2 Msun/yr SFR [0.03/56] Star Formation Rate, Msun/yr
131-131 A1 --- l_logMg Upper limit flag on logMg
132-136 F5.2 [Msun] logMg [7.8/10.5] Log of total gas mass
(Mgas=100xMdust), solar units
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Note (1): Herschel PACS/SPIRE photometric methods, one per band:
A = aperture
M = model fitting
C = compact
P = PSF fitting
G = Gaussian fitting
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- GIDc Galaxy ID, Control Sample (1)
10- 18 F9.5 deg RAdeg Right Ascension (J2000), decimal degrees
20- 28 F9.6 deg DEdeg Declination (J2000), decimal degrees
30- 38 F9.7 --- z [0.010/0.091] Redshift taken from SDSS
40- 40 A1 --- l_F100 Upper Limit Flag on F100
41- 47 F7.2 mJy F100 [18/7972] Herschel/PACS 100µm Flux, mJy
49- 53 F5.2 mJy e_F100 [5/36]? Uncertainty in F100
55- 55 A1 --- l_F160 Upper Limit Flag on F160
56- 63 F8.2 mJy F160 [24/10154] Herschel/PACS 160µm Flux, mJy
65- 69 F5.2 mJy e_F160 [7/53]? Uncertainty in F160
71- 71 A1 --- l_F250 Upper Limit Flag on F250
72- 78 F7.2 mJy F250 [36/4484] Herschel/SPIRE 250µm Flux, mJy
80- 84 F5.2 mJy e_F250 [7/52]? Uncertainty in F250
86- 86 A1 --- l_F350 Upper Limit Flag on F350
87- 93 F7.2 mJy F350 [37/2001] Herschel/SPIRE 350µm Flux, mJy
95- 99 F5.2 mJy e_F350 [8/45]? Uncertainty in F350
101-101 A1 --- l_F500 Upper Limit Flag on F500
102-108 F7.2 mJy F500 [36/779] Herschel/SPIRE 500µm Flux, mJy
110-114 F5.2 mJy e_F500 [10/51]? Uncertainty in F500
116-120 F5.2 [Msun] logM* [9.7/11.5] Log Stellar Mass, solar units
122-122 A1 --- l_SFR Upper limit flag on SFR
123-127 F5.2 Msun/yr SFR [0.1/15.5] Star Formation Rate, solar mass/yr
129-129 A1 --- l_logMg Upper limit flag on logMg
130-134 F5.2 [Msun] logMg [8.9/10.8] Log Total Gas Mass, solar units
136-152 A17 --- GIDp ID of matched H-KPAIR galaxy, 2MASX
(JHHMMSSss+DDMMSSs)
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Note (1): The control sample was selected among 2MASS galaxies of redshift
z<0.1 (from SDSS), found in four Level-5 HerMES fields: Bootes HerMES,
EGS HerMES, ELAIS N1 HerMES, and Lockman SWIRE ("lk"). Details of the
Herschel PACS and SPIRE observations in these fields can be found in
Oliver et al. (2012, VIII/95).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Mar-2016