J/ApJ/914/104 Superthin galaxies with 5yr sp. and NIR phot. (Bizyaev+, 2021)
Spectral observations of superthin galaxies.
Bizyaev D., Makarov D.I., Reshetnikov V.P., Mosenkov A.V., Kautsch S.J.,
Antipova A.V.
<Astrophys. J., 914, 104 (2021)>
=2021ApJ...914..104B 2021ApJ...914..104B
ADC_Keywords: Galaxies, spectra; Radial velocities; Optical; Infrared
Keywords: Galactic and extragalactic astronomy ; Disk galaxies ;
Galaxy dark matter halos
Abstract:
We conduct spectral observations of 138 superthin galaxies (STGs) with
high radial-to-vertical stellar disk scale ratios with the Dual
Imaging Spectrograph on the 3.5m telescope at the Apache Point
Observatory (APO) to obtain the ionized gas rotation curves with
R∼5000 resolution. We also performed near-infrared (NIR) H and Ks
photometry for 18 galaxies with the NICFPS camera on the 3.5m
telescope. The spectra, the NIR photometry, and published optical and
NIR photometry are used for modeling that utilizes the thickness of
the stellar disk and rotation curves simultaneously. The projection
and dust extinction effects are taken into account. We evaluate eight
models that differ in their free parameters and constraints. As a
result, we estimated the masses and scale lengths of the galactic dark
halos. We find systematic differences between the properties of our
red and blue STGs. The blue STGs have a large fraction of dynamically
underevolved galaxies whose vertical velocity dispersion is low in
both gas and stellar disks. The dark halo-to-disk scale ratio is
shorter in the red STGs than in the blue ones, but in a majority of
all STGs, this ratio is under 2. The optical color (r-i) of the STGs
correlates with their rotation curve maximum, vertical velocity
dispersion in stellar disks, and mass of the dark halo. We conclude
that there is a threshold central surface density of 50M☉/pc2
below which we do not observe very thin, rotationally supported
galactic disks.
Description:
Here we rely on a sample of verified edge-on galaxies by
Bizyaev+ (2014, J/ApJ/787/24; "Edge-on disk Galaxies In SDSS,"
hereafter EGIS). Part of these galaxies was observed in the
near-infrared (NIR) by Bizyaev+ (2020AN....341..314B 2020AN....341..314B). In this paper
we report results from our long-term spectroscopic campaign, as well
as an additional NIR photometry.
We continued observations in the same manner as described by
Bizyaev+ (2017, J/MNRAS/465/3784). We were able to collect spectra of
138 objects with the Dual Imaging Spectrograph (DIS) on the 3.5m
telescope at the Apache Point Observatory (APO) between 2014 December
and 2019 August. All observations were conducted in the
high-resolution mode (B1200/R1200 grating), which provides a spectral
resolution of 5000; each galaxy was observed with one to three
exposures, from 15 to 60 minutes long (see Table 1).
The paper Bizyaev+ (2020AN....341..314B 2020AN....341..314B) describes the near-infrared
photometry of 49 galaxies from our list. We conducted additional
observations of 18 galaxies with the Near-Infrared Camera &
Fabry-Perot Spectrometer (NIC-FPS) camera on the 3.5m telescope at the
Apache Point Observatory (APO). Each galaxy was observed in a sequence
of 20-60 short dithered exposures. See Section 2.2 and Table 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 41 138 Spectral observations of superthin galaxies
table2.dat 44 18 Objects, date of NIR observations, filter,
exposure time and seeing FWHM
table4.dat 89 137 Parameters of superthin galaxies
table6.dat 57 137 Parameters of the galaxies obtained in Model 6
(see model definitions in Section 4.2)
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See also:
VII/162 : Flat Galaxy Catalogue (Karachentsev+ 1993)
VII/219 : Revised Flat Galaxy Catalogue (RFGC) (Karachentsev+, 1999)
VIII/77 : HI spectral properties of galaxies (Springob+, 2005)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/AJ/114/2402 : Rotation curves of early-type galaxies (Courteau+, 1997)
J/AJ/114/122 : Spectroscopy of edge-on spirals (Giovanelli+ 1997)
J/A+A/389/795 : Vertical structure of edge-on galaxies (Bizyaev+, 2002)
J/A+A/445/765 : A Catalog of Edge-on Disk Galaxies (Kautsch+, 2006)
J/MNRAS/373/781 : JHK photometry of faint standard stars (Leggett+, 2006)
J/ApJ/688/237 : Disk corrugations in IC 2233 (Matthews+, 2008)
J/ApJ/702/1567 : Structure of 2MASS edge-on galaxies (Bizyaev+, 2009)
J/AJ/138/1938 : EDD: All Digital HI profile catalog (Courtois+, 2009)
J/MNRAS/425/2741 : Parameters of Spiral galaxies from SDSS 7 (Hall+, 2012)
J/ApJ/787/24 : Structural param. of true edge-on galaxies (Bizyaev+, 2014)
J/ApJS/219/4 : S4G pipeline 4: multi-component decompositions (Salo+, 2015)
J/MNRAS/465/3784 : Very thin discs galaxies properties (Bizyaev+, 2017)
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
http://users.apo.nmsu.edu/~dmbiz/EGIS/ : Edge-on Galaxies In SDSS online cat.
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- ID Object identifier (G1)
20 A1 --- n_ID Note on the galaxy <EON211.1892.896> (1)
22- 23 I2 d Obs.D Observation day
25- 27 A3 "month" Obs.M Observation month
29- 32 I4 yr Obs.Y [2014/2019] Observation year
34- 35 I2 min Exp [10/60] Total exposure time
37- 41 I5 km/s RVel [388/36909] Heliocentric radial velocity
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Note (1): Note as follows:
a = The galaxy <EON211.1892.896> was observed and the emission line
in it is really ghosty. It was impossible to extract a rotation
curve from it; hence there is no data in Tables 4 and 6 for this galaxy.
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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- 18 A18 --- ID Object identifier (G1)
20- 21 I2 d Obs.D Observation day
23- 25 A3 "month" Obs.M Observation month
27- 30 I4 yr Obs.Y [2015/2016] Observation year
32- 33 A2 --- Filt Filter used ("H" or "Ks")
35- 39 A5 s Exp Exposure time
41- 44 F4.2 arcsec FWHM [0.79/1.83] Seeing full-width at half-maximum
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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- 18 A18 --- ID Object identifier (G1)
20- 25 F6.2 Mpc Dist [9.5/515.7] Distance (2)
27- 32 F6.3 kpc hOpt [0.85/31.63] Optical radial scale height (3)
34- 39 F6.3 kpc e_hOpt [0.003/37] Uncertainty in hOpt (3)
41- 45 F5.3 kpc z0Opt [0.23/2.22] Optical vertical scale height (3)
47- 51 F5.3 kpc e_z0Opt [0.018/0.42] Uncertainty in z0Opt (3)
53- 58 F6.3 kpc hNIR [0.4/12.4] Near-IR radial scale height
60- 64 F5.3 kpc e_hNIR [0.001/3.2] Uncertainty in hNIR
66- 70 F5.3 kpc z0NIR [0.028/1.97] Near-IR vertical scale height
72- 76 F5.3 kpc e_z0NIR [0.007/0.35] Uncertainty in z0NIR
78- 83 F6.3 mag r-i [-0.007/0.48] Intrinsic (r-i) color index (3)
85- 87 I3 km/s Vmax [33/297] Maximum rotation curve velocity
89 A1 --- FNIR NIR source flag (4)
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Note (2): That corresponds to the radial velocity corrected for the CMB motion.
Note (3): From the "Edge-on disk Galaxies In SDSS" (EGIS) catalog
(Bizyaev+ 2014, J/ApJ/787/24)
Note (4): These can be "h" or "k" when the APO 3.5m 340 data are used,
"H" or "K" when the data are taken from Bizyaev+ (2020AN....341..314B 2020AN....341..314B),
or "F" if equation (1) was applied.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- ID Object identifier (G1)
20- 22 I3 Msun/pc2 Sigma0 [32/655] Central surface density
24- 28 F5.2 kpc hFit [0.41/26.95] Fitted disk scale length
30- 34 F5.2 kpc aHalo [0.1/50] Halo scale length
36- 40 F5.2 [Msun] logMd [0/12.7] log disk mass
42- 46 F5.2 [Msun] logMh [8.78/11.8] log halo mass
48- 56 E9.3 --- chi2 [0.2/164.7] Best fitting χ-square value
57 A1 --- f_chi2 [*] Flag on chi2 (5)
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Note (5): Flag as follows:
* = Values of 1.000e+02 indicate the cases of non-convergence.
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Global notes:
Note (G1): The names of the galaxies from the EGIS catalogue contain
RA and DEC coordinates of their center in decimal degrees.
Galaxies are in Simbad.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Dec-2022