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Current Activities of TIFR Infrared Group & Plans for Near Future. Swarna Kanti Ghosh, Bhaswati Mookerjea, Devendra Ojha Scientific and Technical Staff : S L D’Costa, M B Naik, S S Poojary, P Sandimani, C B Bakalkar, G S Meshram, D M Patkar, R B Jadhav. Central Research Theme.

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slide1

Current Activities of TIFR

Infrared Group & Plans for

Near Future

Swarna Kanti Ghosh, Bhaswati Mookerjea, Devendra Ojha

Scientific and Technical Staff :

S L D’Costa, M B Naik, S S Poojary, P Sandimani, C B Bakalkar,

G S Meshram, D M Patkar, R B Jadhav

central research theme
Central Research Theme

The study of Interstellar Medium (ISM) in

relation to Star Formation in our Galaxy

and nearby galaxies

- Properties of interstellar dust and gas

- Multi-wavelength studies

current research activities
Current Research Activities

Far Infrared (FIR) studies:

High angular resolution (~ 1\') mapping of Galactic Star

Forming Regions (GSFRs) using TIFR 100 cm balloon borne

telescope(from TIFR Balloon Facility, Hyderabad) **

 in two FIR bands (150 & 210 m ) **

 in astrophysically important [C II] line at 158 m

using Fabry Perot Spectrometer, FPS

(TIFR – Japan collaboration) **

current research activities cont
Current Research Activities cont….

Near Infrared (NIR), Optical & Radio continuum studies of

GSFRs (Ground-based) :

 Using NIR imager (including TIFR 1 - 5 µm camera: TIRCAM)**

  • Optical imagers / spectrometers from various ground based

telescopes at the National observatories

(at Mount Abu, Hanle, Nainital; GMRT)****

 H2 (1-0)S1 – rotational-vibrational line of molecular hydrogen (2.12 µm)

(shocked gas) **

 Br – hydrogen recombination line (2.16 µm) (Ionized gas)

 H, [S II], [O III],… narrow-band imaging: Ionized/shocked emission

 Optical spectroscopy: Ionizing source(s), Embedded PMS stars, Nebular

characteristics

 Slitless Spectroscopy Surveys:Search for H emission stars of T Tauri and

related types (TTSs) as well as of Herbig-Haro objects

current research activities cont1
Current Research Activities cont….
  • International facilities (through competitive, peer-reviewed observing proposals and archival databases):VLT, UKIRT, SUBARU, SPITZER, MSX, ISO, AKARI, JCMT
  • Numerical modelling:

- Radiative transfer;

- UIB emission from the MSX & Spitzer bands;

- Model of stellar population synthesis of the

Galaxy

in near future
In Near Future…..

NIR imager for 2 meter Himalayan Chandra Telescope

(HCT), Hanle (Ladakh)

TIRCAM-II  Upgradation of TIRCAM-I

 A large format NIR array (Aladdin III quadrant InSb

512 x 512 pixels; 1 - 5 µm) has been procured from

Raytheon, USA, to upgrade the TIRCAM-I (58 x 62 pixels). ***

 The upgradation work is nearly complete for the NIR

imaging (PAH, nbL’, M-band) beyond 2 µm with 2 meter

HCT in Hanle, Ladakh (altitude ~ 4,517 meter) *

near infrared spectrometer nirspec for large aperture indian telescopes d tel 2 meter
Near Infrared Spectrometer (NIRSPEC) for Large Aperture Indian Telescopes (Dtel≥ 2 meter)

 Plan to develop a NIR spectrometer

(with imaging capabilities) based on

1024 x 1024 HgCdTe focal plane array

(Rockwell HAWAII-I 1K PACE detector)

for use with large aperture (Dtel 2 meter)

ground-based Indian telescopes

slide8

NIRSPEC(General Specifications):

Optical Feeds :

ARIES, Nainital 3.6 meter (by 2012)*

Optical design f#9

FOV 6.8 arcminutes

Pixel size ~0.4 arcseconds

Imaging :

1 - 2.5 microns

Filters : J, H, K, H2, Br Gamma, Kcont, CO, [Fe II] & few others

Spectroscopic mode :

Resolving power of 1,000 to 3,000

Slit width of 0.8 and 1.2 pixels

Slit length > 4 arcminutes

Two Grisms (JH & HK wavelength range)

slide9

Sub-mm Astronomy from Hanle (Ladakh);

Time sharing in large telescopes

(e.g., UKIRT, Gemini) ?

slide11

TIFR 100 cm

Balloon Borne

Far Infrared

Telescope

“T100”

payload

(on Launch

Arm)

Primary : 100 cm

aluminium ;

Mass ~ 850 Kg

No. of launches : 20

Final map resolution

~ 1.0 arc min

(@ 200 mm)

slide14

RCW 106

TIFR - 150 μm

TIFR - 210 μm

Southern Galactic star forming region

Distance ~ 3.6 kpc

23 discrete COLD sources (M ≥ 15 Msun)

Dust emission

in far infrared

T150/210

210

~ 1.2 deg2

Spatial distribution

of dust temperature

& optical depth

T ~ 20 - 40 K

Peak optical depth ~ 0.10

slide15

Fabry Perot Spectrometer (FPS)

ISAS (Institute of Space & Astronautical Science, Japan)

Tuned to [CII] line at 157.7 µm

Detector –

Stressed Ge:Ga Photoconductor

Spectral Resolution –

~1700 (175 km/s)

Spectral Range –

157.41 µm to 158.57 µm

Spatial Resolution -- 1.4’

Detection Limit –

3 x 10-5 ergs s-1 cm-2 sr-1

slide16

Far Infrared Spectroscopic mapping of Orion-A

( [C II] line at 158 mm – most efficient coolant

of the interstellar gas at ~ 100 K )

slide24

Fabry Perot Spectrometer(FPS)

(developed at ISAS, Japan & adapted for T100)

Stressed Ge:Ga photoconductor

(Spectral Response)

Spectral Resolution (R) ~ 1700

Spectral scanning range ~ 63.2 – 63.5 cm^-1

(157.4 mm – 158.2 mm)

Basic configuration

of the FPS

Scanning Fabry Perot

slide26

Spatial distribution of Dust Temperature , etc

TIFR FIR 130 and 200 μm maps probe the cold dust T ~ 34 K

(assuming λλ-2)

IRAS-HIRES 12 and 25 μm maps have been used to obtain T(12/25) and 25

(assuming λλ-1)

25

T(12/25)

Contours are 1, 5, 10, 20, 30, 40, 50,

60, 70, 80, 90 and 95% of peak optical depth

(0.001)

Isotherms are 100, 110, 120, 125, 135,

140, 150, 170 K

slide27

IRAS 19111+1048

IRAS 19110+1045

8

5

11

1

4

15

12

23

18

9

25

16

27

20

13

10

3

6

24

21

19

22

7

26

2

14

17

Radio emission from ionised gas

GMRT- 1280 MHz

Date of Observation - 28 Oct\'01 Primary beam - 26.1’

Synthesized beam - 7.5” x 3.8” Position angle - -34.4o

noise in map - 0.8 mJy/bm Cont. Bandwidth - 16

Phase calibrators - 2011-067

slide28

Results from radiative transfer modeling

IRAS 19111+1048

IRAS 19110+1045

slide34

(Another

view …)

slide37

(Another view of the TIFR Balloon Facility)

(High ceiling lab. to house T100; S-band telemetry antenna)

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