“Hassan Fathivavsari”

Tel:  021-2310 5033

IPM Positions

PostDoctoral Associate, School of Astronomy
(2016 - 2018 )

non IPM Affiliations

Visiting researcher, Institut d Astrophysique de Paris (IAP)

Research Interests

Observational cosmology - Quasar absorption line systems - Galaxy evolution.

Research Activities

Strong damped Ly-alpha absorption (DLA) systems located at the same redshift as their background quasars, can act as a natural coronagraph and block the strong Ly-alpha emission from the quasar broad emission line region. This would then allow us to detect Ly-alpha emission of the quasar host galaxy as a narrow Ly-alpha emission at the bottom of the DLA trough. It is then possible to study the feeding and feedback mechanisms of the AGN by tracing the Ly-alpha emission from the innermost region of the quasar to the outermost region of its halo.

Present Research Project at IPM

Using coronagraphic DLAs to reveal quasar host galaxies

Related Papers

1. H. Fathivavsari
Constraining the Metallicities of Damped Ly[Math Processing Error] Systems Using Extinction Curves
Astrophysical Journal 908 (2021),   [abstract]
Code: IPM/A-2020/36
2. H. Fathivavsari
Using Machine Learning to Find Ghostly Damped Ly�± Systems in SDSS DR14
Astrophysical Journal 901 (2020),   [abstract]
Code: IPM/A-2020/21
3. H. Fathivavsari
Deep Learning Prediction of Quasars Broad Lyα Emission Line
ApJ 898 (2020),   [abstract]
Code: IPM/A-2020/17
4. H. Fathivavsari
Ghostly Damped Lyα Systems: Tracers of Gas Flows in the Close Vicinity of Quasars ?
ApJ 888 (2020),   [abstract]
Code: IPM/A-2019/43
5. P. Noterdaeme, S. Balashev, J.-K. Krogager, R. Srianand, H. Fathivavsari, P. Petitjean and C. Ledoux
Proximate Molecular Quasar Absorbers: Excess of damped H2 systems at zabs zQSO in SDSS DR14
Astronomy & Astrophysics 627 (2019),   [abstract]
Code: IPM/A-2019/48
6. S. Zou, P. Petitjean, P. Noterdaeme, C. Ledoux, J-K. Krogager, H. Fathivavsari, R. Srianand and S. L�³pez
Near Infrared spectroscopic observations of high redshift C~{\sc i} absorbers
Astronomy & Astrophysics 616 (2018),   [abstract]
Code: IPM/A-2018/41
7. N. Jamialahmadi, Th. Ratzka, O. Panic, H. Fathivavsari, R. Van Boekel, S. Flement, Th. Hening, W. Jaffe and G. Mulders
Constraining the gap size in the disk around HD 100546 in the mid-infrared
Astrophysical Journal 865 (2018),   [abstract]
Code: IPM/A-2018/09
8. H. Fathivavsari, P. Petitjean, N. Jamialahmadi, H. G Khosroshahi , H. Rahmani, H. Finley, P. Noterdaeme, I. Pâris and R. Srianand
Eclipsing damped Lyα systems in the Sloan Digital Sky Survey Data Release 12
MNRAS (2018),   [abstract]
Code: IPM/A-2018/01
9. H. Fathivavsari, P. Petitjean, S. Zou, P. Noterdaeme, C. Ledoux, T. Kr�¼hler and R. Srianand
A ghostly damped Ly α system revealed by metal absorption lines
MNRAS 466 (2017),   [abstract]
Code: IPM/A-2017/32
10. N. Jamialahmadi, B. Lopez, Ph. Berio, A. Matter, S. Flament, H. Fathivavsari, T. Ratzka, M. L. Sitko, A. Spang and R. W. Russell
On the inner disc structure of MWC480: evidence for asymmetries?
MNRAS 473 (2017),   [abstract]
Code: IPM/A-2017/31
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