Witnessing the star formation quenching in L* ellipticals

被引:12
作者
Dhiwar, Suraj [1 ,2 ]
Saha, Kanak [1 ]
Dekel, Avishai [3 ,4 ]
Paswan, Abhishek [1 ,5 ,6 ]
Pandey, Divya [7 ]
Cortesi, Arianna [8 ,9 ]
Pandge, Mahadev [10 ]
机构
[1] Inter Univ, Ctr Astron & Astrophys, Pune 411007, India
[2] Savitribai Phule Pune Univ, Dept Phys, Pune 411007, India
[3] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
[4] Univ Calif Santa Cruz, SCIPP, Santa Cruz, CA 95064 USA
[5] Indian Inst Astrophys IIA, Bengaluru 560034, India
[6] Univ Allahabad, Dept Phys, Prayagraj 211002, India
[7] Natl Inst Technol, Dept Phys & Astron, Rourkela 769008, Odisha, India
[8] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer IAG, R Matao 1226, BR-05508090 Sao Paulo, Brazil
[9] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira Pedro Antonio,43 Ctr, BR-20080090 Rio De Janeiro, Brazil
[10] Dayanand Sci Coll, Latur 413512, Maharashtra, India
基金
以色列科学基金会;
关键词
galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: photometry; galaxies: star formation; galaxies: structure; SPECTRAL-ENERGY-DISTRIBUTIONS; EARLY-TYPE GALAXIES; MASS ASSEMBLY GAMA; TO-LIGHT RATIOS; STELLAR MASS; GREEN VALLEY; FORMING GALAXIES; HYDRODYNAMICAL SIMULATIONS; FORMATION HISTORIES; LUMINOSITY FUNCTION;
D O I
10.1093/mnras/stac3369
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the evolution of L-* elliptical galaxies in the colour-magnitude diagram in terms of their star formation history and environment, in an attempt to learn about their quenching process. We have visually extracted 1109 L-* galaxies from a sample of 36 500 galaxies that were spectroscopically selected from Stripe82 of the Sloan Digital Sky Survey (SDSS). From this sample, we have selected 51 ellipticals based on their surface-brightness profile being well-fitted by a single Seersic profile with Seersic indices 3 < n < 6. Our sample consists of 12 blue-cloud L-* ellipticals (BLEs), 11 green-valley L-* ellipticals (GLEs), and 28 red-sequence L-* ellipticals (RLEs). We find that most of the RLEs and GLEs have been quenched only recently, or are still forming stars, based on their [O III] and H alpha emission, while the BLEs are forming stars vigorously. The star formation in BLEs is found to be extended over the galaxy and not confined to their central region. In about 40 per cent of the L-* ellipticals (10 BLEs, 4 GLEs, and 5 RLEs), star formation quenching seems to have started only recently, based on the lower [O III] emission compared to the [O II] and H alpha emission, at a given metallicity. We also find that the galaxy colour is correlated with the cosmic-web environment, with the BLEs tending to reside in lower density regions, the RLEs preferring denser, clustered regions, and the GLEs found in either. One possible scenario is that as the star-forming ellipticals migrate into the clusters, their star formation is suffocated by the hot intracluster medium.
引用
收藏
页码:4943 / 4960
页数:18
相关论文
共 152 条
[1]   Ram pressure stripping of spiral galaxies in clusters [J].
Abadi, MG ;
Moore, B ;
Bower, RG .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 308 (04) :947-954
[2]  
Abazajian K. N., 2009, ASTROPHYS J SUPPL S, V182, P543, DOI DOI 10.1088/0067-0049/182/2/543
[3]  
Angthopo J, 2021, MON NOT R ASTRON SOC, V502, P3685, DOI 10.1093/mnras/staa3294
[4]   A detailed look at the stellar populations in green valley galxies [J].
Angthopo, James ;
Ferreras, Ignacio ;
Silk, Joseph .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2020, 495 (03) :2720-2737
[5]   Exploring a new definition of the green valley and its implications [J].
Angthopo, James ;
Ferreras, Ignacio ;
Silk, Joseph .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 488 (01) :L99-L103
[6]   Galaxy Morphology Revealed By SDSS: Blue Elliptical Galaxies [J].
Ann, Hong Bae .
GALAXIES AND THEIR MASKS: A CONFERENCE IN HONOUR OF K C FREEMAN, FRS, 2010, :195-200
[7]  
Baldry I. K., 2010, MNRAS, V404, P86, DOI DOI 10.1111/J.1365-2966.2010.16282.X
[8]   Quantifying the bimodal color-magnitude distribution of galaxies [J].
Baldry, IK ;
Glazebrook, K ;
Brinkmann, J ;
Ivezic, Z ;
Lupton, RH ;
Nichol, RC ;
Szalay, AS .
ASTROPHYSICAL JOURNAL, 2004, 600 (02) :681-694
[9]   CLASSIFICATION PARAMETERS FOR THE EMISSION-LINE SPECTRA OF EXTRA-GALACTIC OBJECTS [J].
BALDWIN, JA ;
PHILLIPS, MM .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1981, 93 (551) :5-19
[10]   Exploring X-ray and radio emission of type 1 AGN up to z ∼ 2.3 [J].
Ballo, L. ;
Heras, F. J. H. ;
Barcons, X. ;
Carrera, F. J. .
ASTRONOMY & ASTROPHYSICS, 2012, 545