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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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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


NIRSPEC Indian Telescopes (D(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)


Sub-mm Astronomy from Hanle (Ladakh); Indian Telescopes (D

Time sharing in large telescopes

(e.g., UKIRT, Gemini) ?


Thank You ! Indian Telescopes (D


TIFR Indian Telescopes (D100 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)


@ 0.3 K Indian Telescopes (D


RCW 106 Indian Telescopes (D

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


Fabry Perot Spectrometer (FPS) Indian Telescopes (D

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


Far Infrared Spectroscopic mapping of Orion-A Indian Telescopes (D

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

of the interstellar gas at ~ 100 K )



Fabry Perot Spectrometer Indian Telescopes (D(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


Spatial distribution of Dust Temperature , etc Indian Telescopes (D

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


IRAS 19111+1048 Indian Telescopes (D

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


Results from radiative transfer modeling Indian Telescopes (D

IRAS 19111+1048

IRAS 19110+1045



TIRCAM-II : Indian Telescopes (DPreparation for MUX installation


TIRCAM-II (with MUX) Indian Telescopes (D


(Another Indian Telescopes (D

view …)


(on the launch field …) Indian Telescopes (D


TIFR Balloon Facility, Hyderabad Indian Telescopes (D


(Another view of the TIFR Balloon Facility) Indian Telescopes (D

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



The launch ….. Indian Telescopes (D



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