J/PASP/135/J4101 Star formation properties of LSBGs and SFs (Lei+, 2023)
Examining the influence of the regions on star formation surface density.
Lei F.-J., Wu H.
<Publ. Astron. Soc. Pac., 135, 104101 (2023)>
=2023PASP..135j4101L 2023PASP..135j4101L (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; Photometry, H-alpha
Keywords: Galaxy formation
Abstract:
We analyzed the star formation surface density ({SIGMA}SFR) between
the global and HII regions in a sample of 69 low surface brightness
galaxies (LSBGs) and 68 star-forming (SF) galaxies using data from the
Hα images. The conventional global {SIGMA}SFR, which is
defined as the star formation rate (SFR) divided by the area of the
global galaxy, may not accurately describe the star formation activity
in LSBGs due to the lower number of HII regions compared to SF
galaxies. To address this, we divide the global galaxy into two
regions, the HII region and the diffuse region, and then study the
{SIGMA}SFR in each region. Our results show that both the SFR and
area of the HII regions in LSBGs are lower than those in SF galaxies,
resulting in the HII region's {SIGMA}SFR (SFR/area) being slightly
lower in LSBGs than in SF galaxies by 0.28dex, although the global
{SIGMA}SFR is at least an order of magnitude lower in LSBGs than in
SF galaxies. Furthermore, a significant difference exists between the
global and HII regions in {SIGMA}SFR. In LSBGs, {SIGMA}SFR
increased by 0.80dex from the global region to the HII region, while
SF galaxies demonstrate a 0.54dex increase, highlighting the crucial
aspect of carefully selecting an appropriate aperture for {SIGMA}SFR
calculations.
Description:
A sample of 69 LSBGs and 68 SF galaxies was selected with relatively
strong Hα fluxes in their Hα images. We divided each
galaxy into two regions: HII and diffuse.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 119 137 The star formation properties of our sample
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- AGC AGC number
8- 11 A4 --- Type Type
13- 17 F5.1 Mpc Dist Distance
19- 22 F4.1 Mpc e_Dist Distance error
24- 28 F5.2 Msun/yr logSFRGR Global region star formation rate
30- 33 F4.2 Msun/yr e_logSFRGR Global region star formation rate
error
35- 38 F4.2 kpc2 logAreaGR Global region area
40- 43 F4.2 kpc2 e_logAreaGR Global region area error
45- 49 F5.2 Msun/yr/kpc logSigmaSFRGR Global region star formation
surface density
51- 54 F4.2 Msun/yr/kpc e_logSigmaSFRGR Global region star formation
surface density error
56- 60 F5.2 Msun/yr logSFRHII HII region star formation rate
62- 65 F4.2 Msun/yr e_logSFRHII HII region star formation rate error
67- 71 F5.2 kpc2 logAreaHII HII region area
73- 76 F4.2 kpc2 e_logAreaHII HII region area error
78- 82 F5.2 Msun/yr/kpc logSigmaSFRHII HII region star formation
surface density
84- 87 F4.2 Msun/yr/kpc e_logSigmaSFRHII HII region star formation
surface density error
89- 93 F5.2 Msun/yr logSFRDR Diffuse region star formation rate
95- 98 F4.2 Msun/yr e_logSFRDR Diffuse region star formation rate
error
100-103 F4.2 kpc2 logAreaDR Diffuse region area
105-108 F4.2 kpc2 e_logAreaDR Diffuse region area error
110-114 F5.2 Msun/yr/kpc logSigmaSFRDR Diffuse region star formation
surface density
116-119 F4.2 Msun/yr/kpc e_logSigmaSFRDR Diffuse region star formation
surface density error
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Mar-2024